linux/security/security.c
Michal Hocko 9897713fe1 bcachefs: do not use PF_MEMALLOC_NORECLAIM
Patch series "remove PF_MEMALLOC_NORECLAIM" v3.


This patch (of 2):

bch2_new_inode relies on PF_MEMALLOC_NORECLAIM to try to allocate a new
inode to achieve GFP_NOWAIT semantic while holding locks. If this
allocation fails it will drop locks and use GFP_NOFS allocation context.

We would like to drop PF_MEMALLOC_NORECLAIM because it is really
dangerous to use if the caller doesn't control the full call chain with
this flag set. E.g. if any of the function down the chain needed
GFP_NOFAIL request the PF_MEMALLOC_NORECLAIM would override this and
cause unexpected failure.

While this is not the case in this particular case using the scoped gfp
semantic is not really needed bacause we can easily pus the allocation
context down the chain without too much clutter.

[akpm@linux-foundation.org: fix kerneldoc warnings]
Link: https://lkml.kernel.org/r/20240926172940.167084-1-mhocko@kernel.org
Link: https://lkml.kernel.org/r/20240926172940.167084-2-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz> # For vfs changes
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: James Morris <jmorris@namei.org>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Paul Moore <paul@paul-moore.com>
Cc: Serge E. Hallyn <serge@hallyn.com>
Cc: Yafang Shao <laoar.shao@gmail.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2024-10-09 12:47:18 -07:00

5981 lines
172 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Security plug functions
*
* Copyright (C) 2001 WireX Communications, Inc <chris@wirex.com>
* Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2001 Networks Associates Technology, Inc <ssmalley@nai.com>
* Copyright (C) 2016 Mellanox Technologies
* Copyright (C) 2023 Microsoft Corporation <paul@paul-moore.com>
*/
#define pr_fmt(fmt) "LSM: " fmt
#include <linux/bpf.h>
#include <linux/capability.h>
#include <linux/dcache.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/kernel_read_file.h>
#include <linux/lsm_hooks.h>
#include <linux/fsnotify.h>
#include <linux/mman.h>
#include <linux/mount.h>
#include <linux/personality.h>
#include <linux/backing-dev.h>
#include <linux/string.h>
#include <linux/xattr.h>
#include <linux/msg.h>
#include <linux/overflow.h>
#include <linux/perf_event.h>
#include <linux/fs.h>
#include <net/flow.h>
#include <net/sock.h>
#define SECURITY_HOOK_ACTIVE_KEY(HOOK, IDX) security_hook_active_##HOOK##_##IDX
/*
* Identifier for the LSM static calls.
* HOOK is an LSM hook as defined in linux/lsm_hookdefs.h
* IDX is the index of the static call. 0 <= NUM < MAX_LSM_COUNT
*/
#define LSM_STATIC_CALL(HOOK, IDX) lsm_static_call_##HOOK##_##IDX
/*
* Call the macro M for each LSM hook MAX_LSM_COUNT times.
*/
#define LSM_LOOP_UNROLL(M, ...) \
do { \
UNROLL(MAX_LSM_COUNT, M, __VA_ARGS__) \
} while (0)
#define LSM_DEFINE_UNROLL(M, ...) UNROLL(MAX_LSM_COUNT, M, __VA_ARGS__)
/*
* These are descriptions of the reasons that can be passed to the
* security_locked_down() LSM hook. Placing this array here allows
* all security modules to use the same descriptions for auditing
* purposes.
*/
const char *const lockdown_reasons[LOCKDOWN_CONFIDENTIALITY_MAX + 1] = {
[LOCKDOWN_NONE] = "none",
[LOCKDOWN_MODULE_SIGNATURE] = "unsigned module loading",
[LOCKDOWN_DEV_MEM] = "/dev/mem,kmem,port",
[LOCKDOWN_EFI_TEST] = "/dev/efi_test access",
[LOCKDOWN_KEXEC] = "kexec of unsigned images",
[LOCKDOWN_HIBERNATION] = "hibernation",
[LOCKDOWN_PCI_ACCESS] = "direct PCI access",
[LOCKDOWN_IOPORT] = "raw io port access",
[LOCKDOWN_MSR] = "raw MSR access",
[LOCKDOWN_ACPI_TABLES] = "modifying ACPI tables",
[LOCKDOWN_DEVICE_TREE] = "modifying device tree contents",
[LOCKDOWN_PCMCIA_CIS] = "direct PCMCIA CIS storage",
[LOCKDOWN_TIOCSSERIAL] = "reconfiguration of serial port IO",
[LOCKDOWN_MODULE_PARAMETERS] = "unsafe module parameters",
[LOCKDOWN_MMIOTRACE] = "unsafe mmio",
[LOCKDOWN_DEBUGFS] = "debugfs access",
[LOCKDOWN_XMON_WR] = "xmon write access",
[LOCKDOWN_BPF_WRITE_USER] = "use of bpf to write user RAM",
[LOCKDOWN_DBG_WRITE_KERNEL] = "use of kgdb/kdb to write kernel RAM",
[LOCKDOWN_RTAS_ERROR_INJECTION] = "RTAS error injection",
[LOCKDOWN_INTEGRITY_MAX] = "integrity",
[LOCKDOWN_KCORE] = "/proc/kcore access",
[LOCKDOWN_KPROBES] = "use of kprobes",
[LOCKDOWN_BPF_READ_KERNEL] = "use of bpf to read kernel RAM",
[LOCKDOWN_DBG_READ_KERNEL] = "use of kgdb/kdb to read kernel RAM",
[LOCKDOWN_PERF] = "unsafe use of perf",
[LOCKDOWN_TRACEFS] = "use of tracefs",
[LOCKDOWN_XMON_RW] = "xmon read and write access",
[LOCKDOWN_XFRM_SECRET] = "xfrm SA secret",
[LOCKDOWN_CONFIDENTIALITY_MAX] = "confidentiality",
};
static BLOCKING_NOTIFIER_HEAD(blocking_lsm_notifier_chain);
static struct kmem_cache *lsm_file_cache;
static struct kmem_cache *lsm_inode_cache;
char *lsm_names;
static struct lsm_blob_sizes blob_sizes __ro_after_init;
/* Boot-time LSM user choice */
static __initdata const char *chosen_lsm_order;
static __initdata const char *chosen_major_lsm;
static __initconst const char *const builtin_lsm_order = CONFIG_LSM;
/* Ordered list of LSMs to initialize. */
static __initdata struct lsm_info *ordered_lsms[MAX_LSM_COUNT + 1];
static __initdata struct lsm_info *exclusive;
#ifdef CONFIG_HAVE_STATIC_CALL
#define LSM_HOOK_TRAMP(NAME, NUM) \
&STATIC_CALL_TRAMP(LSM_STATIC_CALL(NAME, NUM))
#else
#define LSM_HOOK_TRAMP(NAME, NUM) NULL
#endif
/*
* Define static calls and static keys for each LSM hook.
*/
#define DEFINE_LSM_STATIC_CALL(NUM, NAME, RET, ...) \
DEFINE_STATIC_CALL_NULL(LSM_STATIC_CALL(NAME, NUM), \
*((RET(*)(__VA_ARGS__))NULL)); \
DEFINE_STATIC_KEY_FALSE(SECURITY_HOOK_ACTIVE_KEY(NAME, NUM));
#define LSM_HOOK(RET, DEFAULT, NAME, ...) \
LSM_DEFINE_UNROLL(DEFINE_LSM_STATIC_CALL, NAME, RET, __VA_ARGS__)
#include <linux/lsm_hook_defs.h>
#undef LSM_HOOK
#undef DEFINE_LSM_STATIC_CALL
/*
* Initialise a table of static calls for each LSM hook.
* DEFINE_STATIC_CALL_NULL invocation above generates a key (STATIC_CALL_KEY)
* and a trampoline (STATIC_CALL_TRAMP) which are used to call
* __static_call_update when updating the static call.
*
* The static calls table is used by early LSMs, some architectures can fault on
* unaligned accesses and the fault handling code may not be ready by then.
* Thus, the static calls table should be aligned to avoid any unhandled faults
* in early init.
*/
struct lsm_static_calls_table
static_calls_table __ro_after_init __aligned(sizeof(u64)) = {
#define INIT_LSM_STATIC_CALL(NUM, NAME) \
(struct lsm_static_call) { \
.key = &STATIC_CALL_KEY(LSM_STATIC_CALL(NAME, NUM)), \
.trampoline = LSM_HOOK_TRAMP(NAME, NUM), \
.active = &SECURITY_HOOK_ACTIVE_KEY(NAME, NUM), \
},
#define LSM_HOOK(RET, DEFAULT, NAME, ...) \
.NAME = { \
LSM_DEFINE_UNROLL(INIT_LSM_STATIC_CALL, NAME) \
},
#include <linux/lsm_hook_defs.h>
#undef LSM_HOOK
#undef INIT_LSM_STATIC_CALL
};
static __initdata bool debug;
#define init_debug(...) \
do { \
if (debug) \
pr_info(__VA_ARGS__); \
} while (0)
static bool __init is_enabled(struct lsm_info *lsm)
{
if (!lsm->enabled)
return false;
return *lsm->enabled;
}
/* Mark an LSM's enabled flag. */
static int lsm_enabled_true __initdata = 1;
static int lsm_enabled_false __initdata = 0;
static void __init set_enabled(struct lsm_info *lsm, bool enabled)
{
/*
* When an LSM hasn't configured an enable variable, we can use
* a hard-coded location for storing the default enabled state.
*/
if (!lsm->enabled) {
if (enabled)
lsm->enabled = &lsm_enabled_true;
else
lsm->enabled = &lsm_enabled_false;
} else if (lsm->enabled == &lsm_enabled_true) {
if (!enabled)
lsm->enabled = &lsm_enabled_false;
} else if (lsm->enabled == &lsm_enabled_false) {
if (enabled)
lsm->enabled = &lsm_enabled_true;
} else {
*lsm->enabled = enabled;
}
}
/* Is an LSM already listed in the ordered LSMs list? */
static bool __init exists_ordered_lsm(struct lsm_info *lsm)
{
struct lsm_info **check;
for (check = ordered_lsms; *check; check++)
if (*check == lsm)
return true;
return false;
}
/* Append an LSM to the list of ordered LSMs to initialize. */
static int last_lsm __initdata;
static void __init append_ordered_lsm(struct lsm_info *lsm, const char *from)
{
/* Ignore duplicate selections. */
if (exists_ordered_lsm(lsm))
return;
if (WARN(last_lsm == MAX_LSM_COUNT, "%s: out of LSM static calls!?\n", from))
return;
/* Enable this LSM, if it is not already set. */
if (!lsm->enabled)
lsm->enabled = &lsm_enabled_true;
ordered_lsms[last_lsm++] = lsm;
init_debug("%s ordered: %s (%s)\n", from, lsm->name,
is_enabled(lsm) ? "enabled" : "disabled");
}
/* Is an LSM allowed to be initialized? */
static bool __init lsm_allowed(struct lsm_info *lsm)
{
/* Skip if the LSM is disabled. */
if (!is_enabled(lsm))
return false;
/* Not allowed if another exclusive LSM already initialized. */
if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && exclusive) {
init_debug("exclusive disabled: %s\n", lsm->name);
return false;
}
return true;
}
static void __init lsm_set_blob_size(int *need, int *lbs)
{
int offset;
if (*need <= 0)
return;
offset = ALIGN(*lbs, sizeof(void *));
*lbs = offset + *need;
*need = offset;
}
static void __init lsm_set_blob_sizes(struct lsm_blob_sizes *needed)
{
if (!needed)
return;
lsm_set_blob_size(&needed->lbs_cred, &blob_sizes.lbs_cred);
lsm_set_blob_size(&needed->lbs_file, &blob_sizes.lbs_file);
lsm_set_blob_size(&needed->lbs_ib, &blob_sizes.lbs_ib);
/*
* The inode blob gets an rcu_head in addition to
* what the modules might need.
*/
if (needed->lbs_inode && blob_sizes.lbs_inode == 0)
blob_sizes.lbs_inode = sizeof(struct rcu_head);
lsm_set_blob_size(&needed->lbs_inode, &blob_sizes.lbs_inode);
lsm_set_blob_size(&needed->lbs_ipc, &blob_sizes.lbs_ipc);
lsm_set_blob_size(&needed->lbs_key, &blob_sizes.lbs_key);
lsm_set_blob_size(&needed->lbs_msg_msg, &blob_sizes.lbs_msg_msg);
lsm_set_blob_size(&needed->lbs_perf_event, &blob_sizes.lbs_perf_event);
lsm_set_blob_size(&needed->lbs_sock, &blob_sizes.lbs_sock);
lsm_set_blob_size(&needed->lbs_superblock, &blob_sizes.lbs_superblock);
lsm_set_blob_size(&needed->lbs_task, &blob_sizes.lbs_task);
lsm_set_blob_size(&needed->lbs_tun_dev, &blob_sizes.lbs_tun_dev);
lsm_set_blob_size(&needed->lbs_xattr_count,
&blob_sizes.lbs_xattr_count);
lsm_set_blob_size(&needed->lbs_bdev, &blob_sizes.lbs_bdev);
}
/* Prepare LSM for initialization. */
static void __init prepare_lsm(struct lsm_info *lsm)
{
int enabled = lsm_allowed(lsm);
/* Record enablement (to handle any following exclusive LSMs). */
set_enabled(lsm, enabled);
/* If enabled, do pre-initialization work. */
if (enabled) {
if ((lsm->flags & LSM_FLAG_EXCLUSIVE) && !exclusive) {
exclusive = lsm;
init_debug("exclusive chosen: %s\n", lsm->name);
}
lsm_set_blob_sizes(lsm->blobs);
}
}
/* Initialize a given LSM, if it is enabled. */
static void __init initialize_lsm(struct lsm_info *lsm)
{
if (is_enabled(lsm)) {
int ret;
init_debug("initializing %s\n", lsm->name);
ret = lsm->init();
WARN(ret, "%s failed to initialize: %d\n", lsm->name, ret);
}
}
/*
* Current index to use while initializing the lsm id list.
*/
u32 lsm_active_cnt __ro_after_init;
const struct lsm_id *lsm_idlist[MAX_LSM_COUNT];
/* Populate ordered LSMs list from comma-separated LSM name list. */
static void __init ordered_lsm_parse(const char *order, const char *origin)
{
struct lsm_info *lsm;
char *sep, *name, *next;
/* LSM_ORDER_FIRST is always first. */
for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
if (lsm->order == LSM_ORDER_FIRST)
append_ordered_lsm(lsm, " first");
}
/* Process "security=", if given. */
if (chosen_major_lsm) {
struct lsm_info *major;
/*
* To match the original "security=" behavior, this
* explicitly does NOT fallback to another Legacy Major
* if the selected one was separately disabled: disable
* all non-matching Legacy Major LSMs.
*/
for (major = __start_lsm_info; major < __end_lsm_info;
major++) {
if ((major->flags & LSM_FLAG_LEGACY_MAJOR) &&
strcmp(major->name, chosen_major_lsm) != 0) {
set_enabled(major, false);
init_debug("security=%s disabled: %s (only one legacy major LSM)\n",
chosen_major_lsm, major->name);
}
}
}
sep = kstrdup(order, GFP_KERNEL);
next = sep;
/* Walk the list, looking for matching LSMs. */
while ((name = strsep(&next, ",")) != NULL) {
bool found = false;
for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
if (strcmp(lsm->name, name) == 0) {
if (lsm->order == LSM_ORDER_MUTABLE)
append_ordered_lsm(lsm, origin);
found = true;
}
}
if (!found)
init_debug("%s ignored: %s (not built into kernel)\n",
origin, name);
}
/* Process "security=", if given. */
if (chosen_major_lsm) {
for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
if (exists_ordered_lsm(lsm))
continue;
if (strcmp(lsm->name, chosen_major_lsm) == 0)
append_ordered_lsm(lsm, "security=");
}
}
/* LSM_ORDER_LAST is always last. */
for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
if (lsm->order == LSM_ORDER_LAST)
append_ordered_lsm(lsm, " last");
}
/* Disable all LSMs not in the ordered list. */
for (lsm = __start_lsm_info; lsm < __end_lsm_info; lsm++) {
if (exists_ordered_lsm(lsm))
continue;
set_enabled(lsm, false);
init_debug("%s skipped: %s (not in requested order)\n",
origin, lsm->name);
}
kfree(sep);
}
static void __init lsm_static_call_init(struct security_hook_list *hl)
{
struct lsm_static_call *scall = hl->scalls;
int i;
for (i = 0; i < MAX_LSM_COUNT; i++) {
/* Update the first static call that is not used yet */
if (!scall->hl) {
__static_call_update(scall->key, scall->trampoline,
hl->hook.lsm_func_addr);
scall->hl = hl;
static_branch_enable(scall->active);
return;
}
scall++;
}
panic("%s - Ran out of static slots.\n", __func__);
}
static void __init lsm_early_cred(struct cred *cred);
static void __init lsm_early_task(struct task_struct *task);
static int lsm_append(const char *new, char **result);
static void __init report_lsm_order(void)
{
struct lsm_info **lsm, *early;
int first = 0;
pr_info("initializing lsm=");
/* Report each enabled LSM name, comma separated. */
for (early = __start_early_lsm_info;
early < __end_early_lsm_info; early++)
if (is_enabled(early))
pr_cont("%s%s", first++ == 0 ? "" : ",", early->name);
for (lsm = ordered_lsms; *lsm; lsm++)
if (is_enabled(*lsm))
pr_cont("%s%s", first++ == 0 ? "" : ",", (*lsm)->name);
pr_cont("\n");
}
static void __init ordered_lsm_init(void)
{
struct lsm_info **lsm;
if (chosen_lsm_order) {
if (chosen_major_lsm) {
pr_warn("security=%s is ignored because it is superseded by lsm=%s\n",
chosen_major_lsm, chosen_lsm_order);
chosen_major_lsm = NULL;
}
ordered_lsm_parse(chosen_lsm_order, "cmdline");
} else
ordered_lsm_parse(builtin_lsm_order, "builtin");
for (lsm = ordered_lsms; *lsm; lsm++)
prepare_lsm(*lsm);
report_lsm_order();
init_debug("cred blob size = %d\n", blob_sizes.lbs_cred);
init_debug("file blob size = %d\n", blob_sizes.lbs_file);
init_debug("ib blob size = %d\n", blob_sizes.lbs_ib);
init_debug("inode blob size = %d\n", blob_sizes.lbs_inode);
init_debug("ipc blob size = %d\n", blob_sizes.lbs_ipc);
#ifdef CONFIG_KEYS
init_debug("key blob size = %d\n", blob_sizes.lbs_key);
#endif /* CONFIG_KEYS */
init_debug("msg_msg blob size = %d\n", blob_sizes.lbs_msg_msg);
init_debug("sock blob size = %d\n", blob_sizes.lbs_sock);
init_debug("superblock blob size = %d\n", blob_sizes.lbs_superblock);
init_debug("perf event blob size = %d\n", blob_sizes.lbs_perf_event);
init_debug("task blob size = %d\n", blob_sizes.lbs_task);
init_debug("tun device blob size = %d\n", blob_sizes.lbs_tun_dev);
init_debug("xattr slots = %d\n", blob_sizes.lbs_xattr_count);
init_debug("bdev blob size = %d\n", blob_sizes.lbs_bdev);
/*
* Create any kmem_caches needed for blobs
*/
if (blob_sizes.lbs_file)
lsm_file_cache = kmem_cache_create("lsm_file_cache",
blob_sizes.lbs_file, 0,
SLAB_PANIC, NULL);
if (blob_sizes.lbs_inode)
lsm_inode_cache = kmem_cache_create("lsm_inode_cache",
blob_sizes.lbs_inode, 0,
SLAB_PANIC, NULL);
lsm_early_cred((struct cred *) current->cred);
lsm_early_task(current);
for (lsm = ordered_lsms; *lsm; lsm++)
initialize_lsm(*lsm);
}
int __init early_security_init(void)
{
struct lsm_info *lsm;
for (lsm = __start_early_lsm_info; lsm < __end_early_lsm_info; lsm++) {
if (!lsm->enabled)
lsm->enabled = &lsm_enabled_true;
prepare_lsm(lsm);
initialize_lsm(lsm);
}
return 0;
}
/**
* security_init - initializes the security framework
*
* This should be called early in the kernel initialization sequence.
*/
int __init security_init(void)
{
struct lsm_info *lsm;
init_debug("legacy security=%s\n", chosen_major_lsm ? : " *unspecified*");
init_debug(" CONFIG_LSM=%s\n", builtin_lsm_order);
init_debug("boot arg lsm=%s\n", chosen_lsm_order ? : " *unspecified*");
/*
* Append the names of the early LSM modules now that kmalloc() is
* available
*/
for (lsm = __start_early_lsm_info; lsm < __end_early_lsm_info; lsm++) {
init_debug(" early started: %s (%s)\n", lsm->name,
is_enabled(lsm) ? "enabled" : "disabled");
if (lsm->enabled)
lsm_append(lsm->name, &lsm_names);
}
/* Load LSMs in specified order. */
ordered_lsm_init();
return 0;
}
/* Save user chosen LSM */
static int __init choose_major_lsm(char *str)
{
chosen_major_lsm = str;
return 1;
}
__setup("security=", choose_major_lsm);
/* Explicitly choose LSM initialization order. */
static int __init choose_lsm_order(char *str)
{
chosen_lsm_order = str;
return 1;
}
__setup("lsm=", choose_lsm_order);
/* Enable LSM order debugging. */
static int __init enable_debug(char *str)
{
debug = true;
return 1;
}
__setup("lsm.debug", enable_debug);
static bool match_last_lsm(const char *list, const char *lsm)
{
const char *last;
if (WARN_ON(!list || !lsm))
return false;
last = strrchr(list, ',');
if (last)
/* Pass the comma, strcmp() will check for '\0' */
last++;
else
last = list;
return !strcmp(last, lsm);
}
static int lsm_append(const char *new, char **result)
{
char *cp;
if (*result == NULL) {
*result = kstrdup(new, GFP_KERNEL);
if (*result == NULL)
return -ENOMEM;
} else {
/* Check if it is the last registered name */
if (match_last_lsm(*result, new))
return 0;
cp = kasprintf(GFP_KERNEL, "%s,%s", *result, new);
if (cp == NULL)
return -ENOMEM;
kfree(*result);
*result = cp;
}
return 0;
}
/**
* security_add_hooks - Add a modules hooks to the hook lists.
* @hooks: the hooks to add
* @count: the number of hooks to add
* @lsmid: the identification information for the security module
*
* Each LSM has to register its hooks with the infrastructure.
*/
void __init security_add_hooks(struct security_hook_list *hooks, int count,
const struct lsm_id *lsmid)
{
int i;
/*
* A security module may call security_add_hooks() more
* than once during initialization, and LSM initialization
* is serialized. Landlock is one such case.
* Look at the previous entry, if there is one, for duplication.
*/
if (lsm_active_cnt == 0 || lsm_idlist[lsm_active_cnt - 1] != lsmid) {
if (lsm_active_cnt >= MAX_LSM_COUNT)
panic("%s Too many LSMs registered.\n", __func__);
lsm_idlist[lsm_active_cnt++] = lsmid;
}
for (i = 0; i < count; i++) {
hooks[i].lsmid = lsmid;
lsm_static_call_init(&hooks[i]);
}
/*
* Don't try to append during early_security_init(), we'll come back
* and fix this up afterwards.
*/
if (slab_is_available()) {
if (lsm_append(lsmid->name, &lsm_names) < 0)
panic("%s - Cannot get early memory.\n", __func__);
}
}
int call_blocking_lsm_notifier(enum lsm_event event, void *data)
{
return blocking_notifier_call_chain(&blocking_lsm_notifier_chain,
event, data);
}
EXPORT_SYMBOL(call_blocking_lsm_notifier);
int register_blocking_lsm_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_register(&blocking_lsm_notifier_chain,
nb);
}
EXPORT_SYMBOL(register_blocking_lsm_notifier);
int unregister_blocking_lsm_notifier(struct notifier_block *nb)
{
return blocking_notifier_chain_unregister(&blocking_lsm_notifier_chain,
nb);
}
EXPORT_SYMBOL(unregister_blocking_lsm_notifier);
/**
* lsm_blob_alloc - allocate a composite blob
* @dest: the destination for the blob
* @size: the size of the blob
* @gfp: allocation type
*
* Allocate a blob for all the modules
*
* Returns 0, or -ENOMEM if memory can't be allocated.
*/
static int lsm_blob_alloc(void **dest, size_t size, gfp_t gfp)
{
if (size == 0) {
*dest = NULL;
return 0;
}
*dest = kzalloc(size, gfp);
if (*dest == NULL)
return -ENOMEM;
return 0;
}
/**
* lsm_cred_alloc - allocate a composite cred blob
* @cred: the cred that needs a blob
* @gfp: allocation type
*
* Allocate the cred blob for all the modules
*
* Returns 0, or -ENOMEM if memory can't be allocated.
*/
static int lsm_cred_alloc(struct cred *cred, gfp_t gfp)
{
return lsm_blob_alloc(&cred->security, blob_sizes.lbs_cred, gfp);
}
/**
* lsm_early_cred - during initialization allocate a composite cred blob
* @cred: the cred that needs a blob
*
* Allocate the cred blob for all the modules
*/
static void __init lsm_early_cred(struct cred *cred)
{
int rc = lsm_cred_alloc(cred, GFP_KERNEL);
if (rc)
panic("%s: Early cred alloc failed.\n", __func__);
}
/**
* lsm_file_alloc - allocate a composite file blob
* @file: the file that needs a blob
*
* Allocate the file blob for all the modules
*
* Returns 0, or -ENOMEM if memory can't be allocated.
*/
static int lsm_file_alloc(struct file *file)
{
if (!lsm_file_cache) {
file->f_security = NULL;
return 0;
}
file->f_security = kmem_cache_zalloc(lsm_file_cache, GFP_KERNEL);
if (file->f_security == NULL)
return -ENOMEM;
return 0;
}
/**
* lsm_inode_alloc - allocate a composite inode blob
* @inode: the inode that needs a blob
* @gfp: allocation flags
*
* Allocate the inode blob for all the modules
*
* Returns 0, or -ENOMEM if memory can't be allocated.
*/
static int lsm_inode_alloc(struct inode *inode, gfp_t gfp)
{
if (!lsm_inode_cache) {
inode->i_security = NULL;
return 0;
}
inode->i_security = kmem_cache_zalloc(lsm_inode_cache, gfp);
if (inode->i_security == NULL)
return -ENOMEM;
return 0;
}
/**
* lsm_task_alloc - allocate a composite task blob
* @task: the task that needs a blob
*
* Allocate the task blob for all the modules
*
* Returns 0, or -ENOMEM if memory can't be allocated.
*/
static int lsm_task_alloc(struct task_struct *task)
{
return lsm_blob_alloc(&task->security, blob_sizes.lbs_task, GFP_KERNEL);
}
/**
* lsm_ipc_alloc - allocate a composite ipc blob
* @kip: the ipc that needs a blob
*
* Allocate the ipc blob for all the modules
*
* Returns 0, or -ENOMEM if memory can't be allocated.
*/
static int lsm_ipc_alloc(struct kern_ipc_perm *kip)
{
return lsm_blob_alloc(&kip->security, blob_sizes.lbs_ipc, GFP_KERNEL);
}
#ifdef CONFIG_KEYS
/**
* lsm_key_alloc - allocate a composite key blob
* @key: the key that needs a blob
*
* Allocate the key blob for all the modules
*
* Returns 0, or -ENOMEM if memory can't be allocated.
*/
static int lsm_key_alloc(struct key *key)
{
return lsm_blob_alloc(&key->security, blob_sizes.lbs_key, GFP_KERNEL);
}
#endif /* CONFIG_KEYS */
/**
* lsm_msg_msg_alloc - allocate a composite msg_msg blob
* @mp: the msg_msg that needs a blob
*
* Allocate the ipc blob for all the modules
*
* Returns 0, or -ENOMEM if memory can't be allocated.
*/
static int lsm_msg_msg_alloc(struct msg_msg *mp)
{
return lsm_blob_alloc(&mp->security, blob_sizes.lbs_msg_msg,
GFP_KERNEL);
}
/**
* lsm_bdev_alloc - allocate a composite block_device blob
* @bdev: the block_device that needs a blob
*
* Allocate the block_device blob for all the modules
*
* Returns 0, or -ENOMEM if memory can't be allocated.
*/
static int lsm_bdev_alloc(struct block_device *bdev)
{
if (blob_sizes.lbs_bdev == 0) {
bdev->bd_security = NULL;
return 0;
}
bdev->bd_security = kzalloc(blob_sizes.lbs_bdev, GFP_KERNEL);
if (!bdev->bd_security)
return -ENOMEM;
return 0;
}
/**
* lsm_early_task - during initialization allocate a composite task blob
* @task: the task that needs a blob
*
* Allocate the task blob for all the modules
*/
static void __init lsm_early_task(struct task_struct *task)
{
int rc = lsm_task_alloc(task);
if (rc)
panic("%s: Early task alloc failed.\n", __func__);
}
/**
* lsm_superblock_alloc - allocate a composite superblock blob
* @sb: the superblock that needs a blob
*
* Allocate the superblock blob for all the modules
*
* Returns 0, or -ENOMEM if memory can't be allocated.
*/
static int lsm_superblock_alloc(struct super_block *sb)
{
return lsm_blob_alloc(&sb->s_security, blob_sizes.lbs_superblock,
GFP_KERNEL);
}
/**
* lsm_fill_user_ctx - Fill a user space lsm_ctx structure
* @uctx: a userspace LSM context to be filled
* @uctx_len: available uctx size (input), used uctx size (output)
* @val: the new LSM context value
* @val_len: the size of the new LSM context value
* @id: LSM id
* @flags: LSM defined flags
*
* Fill all of the fields in a userspace lsm_ctx structure. If @uctx is NULL
* simply calculate the required size to output via @utc_len and return
* success.
*
* Returns 0 on success, -E2BIG if userspace buffer is not large enough,
* -EFAULT on a copyout error, -ENOMEM if memory can't be allocated.
*/
int lsm_fill_user_ctx(struct lsm_ctx __user *uctx, u32 *uctx_len,
void *val, size_t val_len,
u64 id, u64 flags)
{
struct lsm_ctx *nctx = NULL;
size_t nctx_len;
int rc = 0;
nctx_len = ALIGN(struct_size(nctx, ctx, val_len), sizeof(void *));
if (nctx_len > *uctx_len) {
rc = -E2BIG;
goto out;
}
/* no buffer - return success/0 and set @uctx_len to the req size */
if (!uctx)
goto out;
nctx = kzalloc(nctx_len, GFP_KERNEL);
if (nctx == NULL) {
rc = -ENOMEM;
goto out;
}
nctx->id = id;
nctx->flags = flags;
nctx->len = nctx_len;
nctx->ctx_len = val_len;
memcpy(nctx->ctx, val, val_len);
if (copy_to_user(uctx, nctx, nctx_len))
rc = -EFAULT;
out:
kfree(nctx);
*uctx_len = nctx_len;
return rc;
}
/*
* The default value of the LSM hook is defined in linux/lsm_hook_defs.h and
* can be accessed with:
*
* LSM_RET_DEFAULT(<hook_name>)
*
* The macros below define static constants for the default value of each
* LSM hook.
*/
#define LSM_RET_DEFAULT(NAME) (NAME##_default)
#define DECLARE_LSM_RET_DEFAULT_void(DEFAULT, NAME)
#define DECLARE_LSM_RET_DEFAULT_int(DEFAULT, NAME) \
static const int __maybe_unused LSM_RET_DEFAULT(NAME) = (DEFAULT);
#define LSM_HOOK(RET, DEFAULT, NAME, ...) \
DECLARE_LSM_RET_DEFAULT_##RET(DEFAULT, NAME)
#include <linux/lsm_hook_defs.h>
#undef LSM_HOOK
/*
* Hook list operation macros.
*
* call_void_hook:
* This is a hook that does not return a value.
*
* call_int_hook:
* This is a hook that returns a value.
*/
#define __CALL_STATIC_VOID(NUM, HOOK, ...) \
do { \
if (static_branch_unlikely(&SECURITY_HOOK_ACTIVE_KEY(HOOK, NUM))) { \
static_call(LSM_STATIC_CALL(HOOK, NUM))(__VA_ARGS__); \
} \
} while (0);
#define call_void_hook(HOOK, ...) \
do { \
LSM_LOOP_UNROLL(__CALL_STATIC_VOID, HOOK, __VA_ARGS__); \
} while (0)
#define __CALL_STATIC_INT(NUM, R, HOOK, LABEL, ...) \
do { \
if (static_branch_unlikely(&SECURITY_HOOK_ACTIVE_KEY(HOOK, NUM))) { \
R = static_call(LSM_STATIC_CALL(HOOK, NUM))(__VA_ARGS__); \
if (R != LSM_RET_DEFAULT(HOOK)) \
goto LABEL; \
} \
} while (0);
#define call_int_hook(HOOK, ...) \
({ \
__label__ OUT; \
int RC = LSM_RET_DEFAULT(HOOK); \
\
LSM_LOOP_UNROLL(__CALL_STATIC_INT, RC, HOOK, OUT, __VA_ARGS__); \
OUT: \
RC; \
})
#define lsm_for_each_hook(scall, NAME) \
for (scall = static_calls_table.NAME; \
scall - static_calls_table.NAME < MAX_LSM_COUNT; scall++) \
if (static_key_enabled(&scall->active->key))
/* Security operations */
/**
* security_binder_set_context_mgr() - Check if becoming binder ctx mgr is ok
* @mgr: task credentials of current binder process
*
* Check whether @mgr is allowed to be the binder context manager.
*
* Return: Return 0 if permission is granted.
*/
int security_binder_set_context_mgr(const struct cred *mgr)
{
return call_int_hook(binder_set_context_mgr, mgr);
}
/**
* security_binder_transaction() - Check if a binder transaction is allowed
* @from: sending process
* @to: receiving process
*
* Check whether @from is allowed to invoke a binder transaction call to @to.
*
* Return: Returns 0 if permission is granted.
*/
int security_binder_transaction(const struct cred *from,
const struct cred *to)
{
return call_int_hook(binder_transaction, from, to);
}
/**
* security_binder_transfer_binder() - Check if a binder transfer is allowed
* @from: sending process
* @to: receiving process
*
* Check whether @from is allowed to transfer a binder reference to @to.
*
* Return: Returns 0 if permission is granted.
*/
int security_binder_transfer_binder(const struct cred *from,
const struct cred *to)
{
return call_int_hook(binder_transfer_binder, from, to);
}
/**
* security_binder_transfer_file() - Check if a binder file xfer is allowed
* @from: sending process
* @to: receiving process
* @file: file being transferred
*
* Check whether @from is allowed to transfer @file to @to.
*
* Return: Returns 0 if permission is granted.
*/
int security_binder_transfer_file(const struct cred *from,
const struct cred *to, const struct file *file)
{
return call_int_hook(binder_transfer_file, from, to, file);
}
/**
* security_ptrace_access_check() - Check if tracing is allowed
* @child: target process
* @mode: PTRACE_MODE flags
*
* Check permission before allowing the current process to trace the @child
* process. Security modules may also want to perform a process tracing check
* during an execve in the set_security or apply_creds hooks of tracing check
* during an execve in the bprm_set_creds hook of binprm_security_ops if the
* process is being traced and its security attributes would be changed by the
* execve.
*
* Return: Returns 0 if permission is granted.
*/
int security_ptrace_access_check(struct task_struct *child, unsigned int mode)
{
return call_int_hook(ptrace_access_check, child, mode);
}
/**
* security_ptrace_traceme() - Check if tracing is allowed
* @parent: tracing process
*
* Check that the @parent process has sufficient permission to trace the
* current process before allowing the current process to present itself to the
* @parent process for tracing.
*
* Return: Returns 0 if permission is granted.
*/
int security_ptrace_traceme(struct task_struct *parent)
{
return call_int_hook(ptrace_traceme, parent);
}
/**
* security_capget() - Get the capability sets for a process
* @target: target process
* @effective: effective capability set
* @inheritable: inheritable capability set
* @permitted: permitted capability set
*
* Get the @effective, @inheritable, and @permitted capability sets for the
* @target process. The hook may also perform permission checking to determine
* if the current process is allowed to see the capability sets of the @target
* process.
*
* Return: Returns 0 if the capability sets were successfully obtained.
*/
int security_capget(const struct task_struct *target,
kernel_cap_t *effective,
kernel_cap_t *inheritable,
kernel_cap_t *permitted)
{
return call_int_hook(capget, target, effective, inheritable, permitted);
}
/**
* security_capset() - Set the capability sets for a process
* @new: new credentials for the target process
* @old: current credentials of the target process
* @effective: effective capability set
* @inheritable: inheritable capability set
* @permitted: permitted capability set
*
* Set the @effective, @inheritable, and @permitted capability sets for the
* current process.
*
* Return: Returns 0 and update @new if permission is granted.
*/
int security_capset(struct cred *new, const struct cred *old,
const kernel_cap_t *effective,
const kernel_cap_t *inheritable,
const kernel_cap_t *permitted)
{
return call_int_hook(capset, new, old, effective, inheritable,
permitted);
}
/**
* security_capable() - Check if a process has the necessary capability
* @cred: credentials to examine
* @ns: user namespace
* @cap: capability requested
* @opts: capability check options
*
* Check whether the @tsk process has the @cap capability in the indicated
* credentials. @cap contains the capability <include/linux/capability.h>.
* @opts contains options for the capable check <include/linux/security.h>.
*
* Return: Returns 0 if the capability is granted.
*/
int security_capable(const struct cred *cred,
struct user_namespace *ns,
int cap,
unsigned int opts)
{
return call_int_hook(capable, cred, ns, cap, opts);
}
/**
* security_quotactl() - Check if a quotactl() syscall is allowed for this fs
* @cmds: commands
* @type: type
* @id: id
* @sb: filesystem
*
* Check whether the quotactl syscall is allowed for this @sb.
*
* Return: Returns 0 if permission is granted.
*/
int security_quotactl(int cmds, int type, int id, const struct super_block *sb)
{
return call_int_hook(quotactl, cmds, type, id, sb);
}
/**
* security_quota_on() - Check if QUOTAON is allowed for a dentry
* @dentry: dentry
*
* Check whether QUOTAON is allowed for @dentry.
*
* Return: Returns 0 if permission is granted.
*/
int security_quota_on(struct dentry *dentry)
{
return call_int_hook(quota_on, dentry);
}
/**
* security_syslog() - Check if accessing the kernel message ring is allowed
* @type: SYSLOG_ACTION_* type
*
* Check permission before accessing the kernel message ring or changing
* logging to the console. See the syslog(2) manual page for an explanation of
* the @type values.
*
* Return: Return 0 if permission is granted.
*/
int security_syslog(int type)
{
return call_int_hook(syslog, type);
}
/**
* security_settime64() - Check if changing the system time is allowed
* @ts: new time
* @tz: timezone
*
* Check permission to change the system time, struct timespec64 is defined in
* <include/linux/time64.h> and timezone is defined in <include/linux/time.h>.
*
* Return: Returns 0 if permission is granted.
*/
int security_settime64(const struct timespec64 *ts, const struct timezone *tz)
{
return call_int_hook(settime, ts, tz);
}
/**
* security_vm_enough_memory_mm() - Check if allocating a new mem map is allowed
* @mm: mm struct
* @pages: number of pages
*
* Check permissions for allocating a new virtual mapping. If all LSMs return
* a positive value, __vm_enough_memory() will be called with cap_sys_admin
* set. If at least one LSM returns 0 or negative, __vm_enough_memory() will be
* called with cap_sys_admin cleared.
*
* Return: Returns 0 if permission is granted by the LSM infrastructure to the
* caller.
*/
int security_vm_enough_memory_mm(struct mm_struct *mm, long pages)
{
struct lsm_static_call *scall;
int cap_sys_admin = 1;
int rc;
/*
* The module will respond with 0 if it thinks the __vm_enough_memory()
* call should be made with the cap_sys_admin set. If all of the modules
* agree that it should be set it will. If any module thinks it should
* not be set it won't.
*/
lsm_for_each_hook(scall, vm_enough_memory) {
rc = scall->hl->hook.vm_enough_memory(mm, pages);
if (rc < 0) {
cap_sys_admin = 0;
break;
}
}
return __vm_enough_memory(mm, pages, cap_sys_admin);
}
/**
* security_bprm_creds_for_exec() - Prepare the credentials for exec()
* @bprm: binary program information
*
* If the setup in prepare_exec_creds did not setup @bprm->cred->security
* properly for executing @bprm->file, update the LSM's portion of
* @bprm->cred->security to be what commit_creds needs to install for the new
* program. This hook may also optionally check permissions (e.g. for
* transitions between security domains). The hook must set @bprm->secureexec
* to 1 if AT_SECURE should be set to request libc enable secure mode. @bprm
* contains the linux_binprm structure.
*
* Return: Returns 0 if the hook is successful and permission is granted.
*/
int security_bprm_creds_for_exec(struct linux_binprm *bprm)
{
return call_int_hook(bprm_creds_for_exec, bprm);
}
/**
* security_bprm_creds_from_file() - Update linux_binprm creds based on file
* @bprm: binary program information
* @file: associated file
*
* If @file is setpcap, suid, sgid or otherwise marked to change privilege upon
* exec, update @bprm->cred to reflect that change. This is called after
* finding the binary that will be executed without an interpreter. This
* ensures that the credentials will not be derived from a script that the
* binary will need to reopen, which when reopend may end up being a completely
* different file. This hook may also optionally check permissions (e.g. for
* transitions between security domains). The hook must set @bprm->secureexec
* to 1 if AT_SECURE should be set to request libc enable secure mode. The
* hook must add to @bprm->per_clear any personality flags that should be
* cleared from current->personality. @bprm contains the linux_binprm
* structure.
*
* Return: Returns 0 if the hook is successful and permission is granted.
*/
int security_bprm_creds_from_file(struct linux_binprm *bprm, const struct file *file)
{
return call_int_hook(bprm_creds_from_file, bprm, file);
}
/**
* security_bprm_check() - Mediate binary handler search
* @bprm: binary program information
*
* This hook mediates the point when a search for a binary handler will begin.
* It allows a check against the @bprm->cred->security value which was set in
* the preceding creds_for_exec call. The argv list and envp list are reliably
* available in @bprm. This hook may be called multiple times during a single
* execve. @bprm contains the linux_binprm structure.
*
* Return: Returns 0 if the hook is successful and permission is granted.
*/
int security_bprm_check(struct linux_binprm *bprm)
{
return call_int_hook(bprm_check_security, bprm);
}
/**
* security_bprm_committing_creds() - Install creds for a process during exec()
* @bprm: binary program information
*
* Prepare to install the new security attributes of a process being
* transformed by an execve operation, based on the old credentials pointed to
* by @current->cred and the information set in @bprm->cred by the
* bprm_creds_for_exec hook. @bprm points to the linux_binprm structure. This
* hook is a good place to perform state changes on the process such as closing
* open file descriptors to which access will no longer be granted when the
* attributes are changed. This is called immediately before commit_creds().
*/
void security_bprm_committing_creds(const struct linux_binprm *bprm)
{
call_void_hook(bprm_committing_creds, bprm);
}
/**
* security_bprm_committed_creds() - Tidy up after cred install during exec()
* @bprm: binary program information
*
* Tidy up after the installation of the new security attributes of a process
* being transformed by an execve operation. The new credentials have, by this
* point, been set to @current->cred. @bprm points to the linux_binprm
* structure. This hook is a good place to perform state changes on the
* process such as clearing out non-inheritable signal state. This is called
* immediately after commit_creds().
*/
void security_bprm_committed_creds(const struct linux_binprm *bprm)
{
call_void_hook(bprm_committed_creds, bprm);
}
/**
* security_fs_context_submount() - Initialise fc->security
* @fc: new filesystem context
* @reference: dentry reference for submount/remount
*
* Fill out the ->security field for a new fs_context.
*
* Return: Returns 0 on success or negative error code on failure.
*/
int security_fs_context_submount(struct fs_context *fc, struct super_block *reference)
{
return call_int_hook(fs_context_submount, fc, reference);
}
/**
* security_fs_context_dup() - Duplicate a fs_context LSM blob
* @fc: destination filesystem context
* @src_fc: source filesystem context
*
* Allocate and attach a security structure to sc->security. This pointer is
* initialised to NULL by the caller. @fc indicates the new filesystem context.
* @src_fc indicates the original filesystem context.
*
* Return: Returns 0 on success or a negative error code on failure.
*/
int security_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc)
{
return call_int_hook(fs_context_dup, fc, src_fc);
}
/**
* security_fs_context_parse_param() - Configure a filesystem context
* @fc: filesystem context
* @param: filesystem parameter
*
* Userspace provided a parameter to configure a superblock. The LSM can
* consume the parameter or return it to the caller for use elsewhere.
*
* Return: If the parameter is used by the LSM it should return 0, if it is
* returned to the caller -ENOPARAM is returned, otherwise a negative
* error code is returned.
*/
int security_fs_context_parse_param(struct fs_context *fc,
struct fs_parameter *param)
{
struct lsm_static_call *scall;
int trc;
int rc = -ENOPARAM;
lsm_for_each_hook(scall, fs_context_parse_param) {
trc = scall->hl->hook.fs_context_parse_param(fc, param);
if (trc == 0)
rc = 0;
else if (trc != -ENOPARAM)
return trc;
}
return rc;
}
/**
* security_sb_alloc() - Allocate a super_block LSM blob
* @sb: filesystem superblock
*
* Allocate and attach a security structure to the sb->s_security field. The
* s_security field is initialized to NULL when the structure is allocated.
* @sb contains the super_block structure to be modified.
*
* Return: Returns 0 if operation was successful.
*/
int security_sb_alloc(struct super_block *sb)
{
int rc = lsm_superblock_alloc(sb);
if (unlikely(rc))
return rc;
rc = call_int_hook(sb_alloc_security, sb);
if (unlikely(rc))
security_sb_free(sb);
return rc;
}
/**
* security_sb_delete() - Release super_block LSM associated objects
* @sb: filesystem superblock
*
* Release objects tied to a superblock (e.g. inodes). @sb contains the
* super_block structure being released.
*/
void security_sb_delete(struct super_block *sb)
{
call_void_hook(sb_delete, sb);
}
/**
* security_sb_free() - Free a super_block LSM blob
* @sb: filesystem superblock
*
* Deallocate and clear the sb->s_security field. @sb contains the super_block
* structure to be modified.
*/
void security_sb_free(struct super_block *sb)
{
call_void_hook(sb_free_security, sb);
kfree(sb->s_security);
sb->s_security = NULL;
}
/**
* security_free_mnt_opts() - Free memory associated with mount options
* @mnt_opts: LSM processed mount options
*
* Free memory associated with @mnt_ops.
*/
void security_free_mnt_opts(void **mnt_opts)
{
if (!*mnt_opts)
return;
call_void_hook(sb_free_mnt_opts, *mnt_opts);
*mnt_opts = NULL;
}
EXPORT_SYMBOL(security_free_mnt_opts);
/**
* security_sb_eat_lsm_opts() - Consume LSM mount options
* @options: mount options
* @mnt_opts: LSM processed mount options
*
* Eat (scan @options) and save them in @mnt_opts.
*
* Return: Returns 0 on success, negative values on failure.
*/
int security_sb_eat_lsm_opts(char *options, void **mnt_opts)
{
return call_int_hook(sb_eat_lsm_opts, options, mnt_opts);
}
EXPORT_SYMBOL(security_sb_eat_lsm_opts);
/**
* security_sb_mnt_opts_compat() - Check if new mount options are allowed
* @sb: filesystem superblock
* @mnt_opts: new mount options
*
* Determine if the new mount options in @mnt_opts are allowed given the
* existing mounted filesystem at @sb. @sb superblock being compared.
*
* Return: Returns 0 if options are compatible.
*/
int security_sb_mnt_opts_compat(struct super_block *sb,
void *mnt_opts)
{
return call_int_hook(sb_mnt_opts_compat, sb, mnt_opts);
}
EXPORT_SYMBOL(security_sb_mnt_opts_compat);
/**
* security_sb_remount() - Verify no incompatible mount changes during remount
* @sb: filesystem superblock
* @mnt_opts: (re)mount options
*
* Extracts security system specific mount options and verifies no changes are
* being made to those options.
*
* Return: Returns 0 if permission is granted.
*/
int security_sb_remount(struct super_block *sb,
void *mnt_opts)
{
return call_int_hook(sb_remount, sb, mnt_opts);
}
EXPORT_SYMBOL(security_sb_remount);
/**
* security_sb_kern_mount() - Check if a kernel mount is allowed
* @sb: filesystem superblock
*
* Mount this @sb if allowed by permissions.
*
* Return: Returns 0 if permission is granted.
*/
int security_sb_kern_mount(const struct super_block *sb)
{
return call_int_hook(sb_kern_mount, sb);
}
/**
* security_sb_show_options() - Output the mount options for a superblock
* @m: output file
* @sb: filesystem superblock
*
* Show (print on @m) mount options for this @sb.
*
* Return: Returns 0 on success, negative values on failure.
*/
int security_sb_show_options(struct seq_file *m, struct super_block *sb)
{
return call_int_hook(sb_show_options, m, sb);
}
/**
* security_sb_statfs() - Check if accessing fs stats is allowed
* @dentry: superblock handle
*
* Check permission before obtaining filesystem statistics for the @mnt
* mountpoint. @dentry is a handle on the superblock for the filesystem.
*
* Return: Returns 0 if permission is granted.
*/
int security_sb_statfs(struct dentry *dentry)
{
return call_int_hook(sb_statfs, dentry);
}
/**
* security_sb_mount() - Check permission for mounting a filesystem
* @dev_name: filesystem backing device
* @path: mount point
* @type: filesystem type
* @flags: mount flags
* @data: filesystem specific data
*
* Check permission before an object specified by @dev_name is mounted on the
* mount point named by @nd. For an ordinary mount, @dev_name identifies a
* device if the file system type requires a device. For a remount
* (@flags & MS_REMOUNT), @dev_name is irrelevant. For a loopback/bind mount
* (@flags & MS_BIND), @dev_name identifies the pathname of the object being
* mounted.
*
* Return: Returns 0 if permission is granted.
*/
int security_sb_mount(const char *dev_name, const struct path *path,
const char *type, unsigned long flags, void *data)
{
return call_int_hook(sb_mount, dev_name, path, type, flags, data);
}
/**
* security_sb_umount() - Check permission for unmounting a filesystem
* @mnt: mounted filesystem
* @flags: unmount flags
*
* Check permission before the @mnt file system is unmounted.
*
* Return: Returns 0 if permission is granted.
*/
int security_sb_umount(struct vfsmount *mnt, int flags)
{
return call_int_hook(sb_umount, mnt, flags);
}
/**
* security_sb_pivotroot() - Check permissions for pivoting the rootfs
* @old_path: new location for current rootfs
* @new_path: location of the new rootfs
*
* Check permission before pivoting the root filesystem.
*
* Return: Returns 0 if permission is granted.
*/
int security_sb_pivotroot(const struct path *old_path,
const struct path *new_path)
{
return call_int_hook(sb_pivotroot, old_path, new_path);
}
/**
* security_sb_set_mnt_opts() - Set the mount options for a filesystem
* @sb: filesystem superblock
* @mnt_opts: binary mount options
* @kern_flags: kernel flags (in)
* @set_kern_flags: kernel flags (out)
*
* Set the security relevant mount options used for a superblock.
*
* Return: Returns 0 on success, error on failure.
*/
int security_sb_set_mnt_opts(struct super_block *sb,
void *mnt_opts,
unsigned long kern_flags,
unsigned long *set_kern_flags)
{
struct lsm_static_call *scall;
int rc = mnt_opts ? -EOPNOTSUPP : LSM_RET_DEFAULT(sb_set_mnt_opts);
lsm_for_each_hook(scall, sb_set_mnt_opts) {
rc = scall->hl->hook.sb_set_mnt_opts(sb, mnt_opts, kern_flags,
set_kern_flags);
if (rc != LSM_RET_DEFAULT(sb_set_mnt_opts))
break;
}
return rc;
}
EXPORT_SYMBOL(security_sb_set_mnt_opts);
/**
* security_sb_clone_mnt_opts() - Duplicate superblock mount options
* @oldsb: source superblock
* @newsb: destination superblock
* @kern_flags: kernel flags (in)
* @set_kern_flags: kernel flags (out)
*
* Copy all security options from a given superblock to another.
*
* Return: Returns 0 on success, error on failure.
*/
int security_sb_clone_mnt_opts(const struct super_block *oldsb,
struct super_block *newsb,
unsigned long kern_flags,
unsigned long *set_kern_flags)
{
return call_int_hook(sb_clone_mnt_opts, oldsb, newsb,
kern_flags, set_kern_flags);
}
EXPORT_SYMBOL(security_sb_clone_mnt_opts);
/**
* security_move_mount() - Check permissions for moving a mount
* @from_path: source mount point
* @to_path: destination mount point
*
* Check permission before a mount is moved.
*
* Return: Returns 0 if permission is granted.
*/
int security_move_mount(const struct path *from_path,
const struct path *to_path)
{
return call_int_hook(move_mount, from_path, to_path);
}
/**
* security_path_notify() - Check if setting a watch is allowed
* @path: file path
* @mask: event mask
* @obj_type: file path type
*
* Check permissions before setting a watch on events as defined by @mask, on
* an object at @path, whose type is defined by @obj_type.
*
* Return: Returns 0 if permission is granted.
*/
int security_path_notify(const struct path *path, u64 mask,
unsigned int obj_type)
{
return call_int_hook(path_notify, path, mask, obj_type);
}
/**
* security_inode_alloc() - Allocate an inode LSM blob
* @inode: the inode
* @gfp: allocation flags
*
* Allocate and attach a security structure to @inode->i_security. The
* i_security field is initialized to NULL when the inode structure is
* allocated.
*
* Return: Return 0 if operation was successful.
*/
int security_inode_alloc(struct inode *inode, gfp_t gfp)
{
int rc = lsm_inode_alloc(inode, gfp);
if (unlikely(rc))
return rc;
rc = call_int_hook(inode_alloc_security, inode);
if (unlikely(rc))
security_inode_free(inode);
return rc;
}
static void inode_free_by_rcu(struct rcu_head *head)
{
/* The rcu head is at the start of the inode blob */
call_void_hook(inode_free_security_rcu, head);
kmem_cache_free(lsm_inode_cache, head);
}
/**
* security_inode_free() - Free an inode's LSM blob
* @inode: the inode
*
* Release any LSM resources associated with @inode, although due to the
* inode's RCU protections it is possible that the resources will not be
* fully released until after the current RCU grace period has elapsed.
*
* It is important for LSMs to note that despite being present in a call to
* security_inode_free(), @inode may still be referenced in a VFS path walk
* and calls to security_inode_permission() may be made during, or after,
* a call to security_inode_free(). For this reason the inode->i_security
* field is released via a call_rcu() callback and any LSMs which need to
* retain inode state for use in security_inode_permission() should only
* release that state in the inode_free_security_rcu() LSM hook callback.
*/
void security_inode_free(struct inode *inode)
{
call_void_hook(inode_free_security, inode);
if (!inode->i_security)
return;
call_rcu((struct rcu_head *)inode->i_security, inode_free_by_rcu);
}
/**
* security_dentry_init_security() - Perform dentry initialization
* @dentry: the dentry to initialize
* @mode: mode used to determine resource type
* @name: name of the last path component
* @xattr_name: name of the security/LSM xattr
* @ctx: pointer to the resulting LSM context
* @ctxlen: length of @ctx
*
* Compute a context for a dentry as the inode is not yet available since NFSv4
* has no label backed by an EA anyway. It is important to note that
* @xattr_name does not need to be free'd by the caller, it is a static string.
*
* Return: Returns 0 on success, negative values on failure.
*/
int security_dentry_init_security(struct dentry *dentry, int mode,
const struct qstr *name,
const char **xattr_name, void **ctx,
u32 *ctxlen)
{
return call_int_hook(dentry_init_security, dentry, mode, name,
xattr_name, ctx, ctxlen);
}
EXPORT_SYMBOL(security_dentry_init_security);
/**
* security_dentry_create_files_as() - Perform dentry initialization
* @dentry: the dentry to initialize
* @mode: mode used to determine resource type
* @name: name of the last path component
* @old: creds to use for LSM context calculations
* @new: creds to modify
*
* Compute a context for a dentry as the inode is not yet available and set
* that context in passed in creds so that new files are created using that
* context. Context is calculated using the passed in creds and not the creds
* of the caller.
*
* Return: Returns 0 on success, error on failure.
*/
int security_dentry_create_files_as(struct dentry *dentry, int mode,
struct qstr *name,
const struct cred *old, struct cred *new)
{
return call_int_hook(dentry_create_files_as, dentry, mode,
name, old, new);
}
EXPORT_SYMBOL(security_dentry_create_files_as);
/**
* security_inode_init_security() - Initialize an inode's LSM context
* @inode: the inode
* @dir: parent directory
* @qstr: last component of the pathname
* @initxattrs: callback function to write xattrs
* @fs_data: filesystem specific data
*
* Obtain the security attribute name suffix and value to set on a newly
* created inode and set up the incore security field for the new inode. This
* hook is called by the fs code as part of the inode creation transaction and
* provides for atomic labeling of the inode, unlike the post_create/mkdir/...
* hooks called by the VFS.
*
* The hook function is expected to populate the xattrs array, by calling
* lsm_get_xattr_slot() to retrieve the slots reserved by the security module
* with the lbs_xattr_count field of the lsm_blob_sizes structure. For each
* slot, the hook function should set ->name to the attribute name suffix
* (e.g. selinux), to allocate ->value (will be freed by the caller) and set it
* to the attribute value, to set ->value_len to the length of the value. If
* the security module does not use security attributes or does not wish to put
* a security attribute on this particular inode, then it should return
* -EOPNOTSUPP to skip this processing.
*
* Return: Returns 0 if the LSM successfully initialized all of the inode
* security attributes that are required, negative values otherwise.
*/
int security_inode_init_security(struct inode *inode, struct inode *dir,
const struct qstr *qstr,
const initxattrs initxattrs, void *fs_data)
{
struct lsm_static_call *scall;
struct xattr *new_xattrs = NULL;
int ret = -EOPNOTSUPP, xattr_count = 0;
if (unlikely(IS_PRIVATE(inode)))
return 0;
if (!blob_sizes.lbs_xattr_count)
return 0;
if (initxattrs) {
/* Allocate +1 as terminator. */
new_xattrs = kcalloc(blob_sizes.lbs_xattr_count + 1,
sizeof(*new_xattrs), GFP_NOFS);
if (!new_xattrs)
return -ENOMEM;
}
lsm_for_each_hook(scall, inode_init_security) {
ret = scall->hl->hook.inode_init_security(inode, dir, qstr, new_xattrs,
&xattr_count);
if (ret && ret != -EOPNOTSUPP)
goto out;
/*
* As documented in lsm_hooks.h, -EOPNOTSUPP in this context
* means that the LSM is not willing to provide an xattr, not
* that it wants to signal an error. Thus, continue to invoke
* the remaining LSMs.
*/
}
/* If initxattrs() is NULL, xattr_count is zero, skip the call. */
if (!xattr_count)
goto out;
ret = initxattrs(inode, new_xattrs, fs_data);
out:
for (; xattr_count > 0; xattr_count--)
kfree(new_xattrs[xattr_count - 1].value);
kfree(new_xattrs);
return (ret == -EOPNOTSUPP) ? 0 : ret;
}
EXPORT_SYMBOL(security_inode_init_security);
/**
* security_inode_init_security_anon() - Initialize an anonymous inode
* @inode: the inode
* @name: the anonymous inode class
* @context_inode: an optional related inode
*
* Set up the incore security field for the new anonymous inode and return
* whether the inode creation is permitted by the security module or not.
*
* Return: Returns 0 on success, -EACCES if the security module denies the
* creation of this inode, or another -errno upon other errors.
*/
int security_inode_init_security_anon(struct inode *inode,
const struct qstr *name,
const struct inode *context_inode)
{
return call_int_hook(inode_init_security_anon, inode, name,
context_inode);
}
#ifdef CONFIG_SECURITY_PATH
/**
* security_path_mknod() - Check if creating a special file is allowed
* @dir: parent directory
* @dentry: new file
* @mode: new file mode
* @dev: device number
*
* Check permissions when creating a file. Note that this hook is called even
* if mknod operation is being done for a regular file.
*
* Return: Returns 0 if permission is granted.
*/
int security_path_mknod(const struct path *dir, struct dentry *dentry,
umode_t mode, unsigned int dev)
{
if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
return 0;
return call_int_hook(path_mknod, dir, dentry, mode, dev);
}
EXPORT_SYMBOL(security_path_mknod);
/**
* security_path_post_mknod() - Update inode security after reg file creation
* @idmap: idmap of the mount
* @dentry: new file
*
* Update inode security field after a regular file has been created.
*/
void security_path_post_mknod(struct mnt_idmap *idmap, struct dentry *dentry)
{
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
return;
call_void_hook(path_post_mknod, idmap, dentry);
}
/**
* security_path_mkdir() - Check if creating a new directory is allowed
* @dir: parent directory
* @dentry: new directory
* @mode: new directory mode
*
* Check permissions to create a new directory in the existing directory.
*
* Return: Returns 0 if permission is granted.
*/
int security_path_mkdir(const struct path *dir, struct dentry *dentry,
umode_t mode)
{
if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
return 0;
return call_int_hook(path_mkdir, dir, dentry, mode);
}
EXPORT_SYMBOL(security_path_mkdir);
/**
* security_path_rmdir() - Check if removing a directory is allowed
* @dir: parent directory
* @dentry: directory to remove
*
* Check the permission to remove a directory.
*
* Return: Returns 0 if permission is granted.
*/
int security_path_rmdir(const struct path *dir, struct dentry *dentry)
{
if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
return 0;
return call_int_hook(path_rmdir, dir, dentry);
}
/**
* security_path_unlink() - Check if removing a hard link is allowed
* @dir: parent directory
* @dentry: file
*
* Check the permission to remove a hard link to a file.
*
* Return: Returns 0 if permission is granted.
*/
int security_path_unlink(const struct path *dir, struct dentry *dentry)
{
if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
return 0;
return call_int_hook(path_unlink, dir, dentry);
}
EXPORT_SYMBOL(security_path_unlink);
/**
* security_path_symlink() - Check if creating a symbolic link is allowed
* @dir: parent directory
* @dentry: symbolic link
* @old_name: file pathname
*
* Check the permission to create a symbolic link to a file.
*
* Return: Returns 0 if permission is granted.
*/
int security_path_symlink(const struct path *dir, struct dentry *dentry,
const char *old_name)
{
if (unlikely(IS_PRIVATE(d_backing_inode(dir->dentry))))
return 0;
return call_int_hook(path_symlink, dir, dentry, old_name);
}
/**
* security_path_link - Check if creating a hard link is allowed
* @old_dentry: existing file
* @new_dir: new parent directory
* @new_dentry: new link
*
* Check permission before creating a new hard link to a file.
*
* Return: Returns 0 if permission is granted.
*/
int security_path_link(struct dentry *old_dentry, const struct path *new_dir,
struct dentry *new_dentry)
{
if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry))))
return 0;
return call_int_hook(path_link, old_dentry, new_dir, new_dentry);
}
/**
* security_path_rename() - Check if renaming a file is allowed
* @old_dir: parent directory of the old file
* @old_dentry: the old file
* @new_dir: parent directory of the new file
* @new_dentry: the new file
* @flags: flags
*
* Check for permission to rename a file or directory.
*
* Return: Returns 0 if permission is granted.
*/
int security_path_rename(const struct path *old_dir, struct dentry *old_dentry,
const struct path *new_dir, struct dentry *new_dentry,
unsigned int flags)
{
if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) ||
(d_is_positive(new_dentry) &&
IS_PRIVATE(d_backing_inode(new_dentry)))))
return 0;
return call_int_hook(path_rename, old_dir, old_dentry, new_dir,
new_dentry, flags);
}
EXPORT_SYMBOL(security_path_rename);
/**
* security_path_truncate() - Check if truncating a file is allowed
* @path: file
*
* Check permission before truncating the file indicated by path. Note that
* truncation permissions may also be checked based on already opened files,
* using the security_file_truncate() hook.
*
* Return: Returns 0 if permission is granted.
*/
int security_path_truncate(const struct path *path)
{
if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
return 0;
return call_int_hook(path_truncate, path);
}
/**
* security_path_chmod() - Check if changing the file's mode is allowed
* @path: file
* @mode: new mode
*
* Check for permission to change a mode of the file @path. The new mode is
* specified in @mode which is a bitmask of constants from
* <include/uapi/linux/stat.h>.
*
* Return: Returns 0 if permission is granted.
*/
int security_path_chmod(const struct path *path, umode_t mode)
{
if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
return 0;
return call_int_hook(path_chmod, path, mode);
}
/**
* security_path_chown() - Check if changing the file's owner/group is allowed
* @path: file
* @uid: file owner
* @gid: file group
*
* Check for permission to change owner/group of a file or directory.
*
* Return: Returns 0 if permission is granted.
*/
int security_path_chown(const struct path *path, kuid_t uid, kgid_t gid)
{
if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
return 0;
return call_int_hook(path_chown, path, uid, gid);
}
/**
* security_path_chroot() - Check if changing the root directory is allowed
* @path: directory
*
* Check for permission to change root directory.
*
* Return: Returns 0 if permission is granted.
*/
int security_path_chroot(const struct path *path)
{
return call_int_hook(path_chroot, path);
}
#endif /* CONFIG_SECURITY_PATH */
/**
* security_inode_create() - Check if creating a file is allowed
* @dir: the parent directory
* @dentry: the file being created
* @mode: requested file mode
*
* Check permission to create a regular file.
*
* Return: Returns 0 if permission is granted.
*/
int security_inode_create(struct inode *dir, struct dentry *dentry,
umode_t mode)
{
if (unlikely(IS_PRIVATE(dir)))
return 0;
return call_int_hook(inode_create, dir, dentry, mode);
}
EXPORT_SYMBOL_GPL(security_inode_create);
/**
* security_inode_post_create_tmpfile() - Update inode security of new tmpfile
* @idmap: idmap of the mount
* @inode: inode of the new tmpfile
*
* Update inode security data after a tmpfile has been created.
*/
void security_inode_post_create_tmpfile(struct mnt_idmap *idmap,
struct inode *inode)
{
if (unlikely(IS_PRIVATE(inode)))
return;
call_void_hook(inode_post_create_tmpfile, idmap, inode);
}
/**
* security_inode_link() - Check if creating a hard link is allowed
* @old_dentry: existing file
* @dir: new parent directory
* @new_dentry: new link
*
* Check permission before creating a new hard link to a file.
*
* Return: Returns 0 if permission is granted.
*/
int security_inode_link(struct dentry *old_dentry, struct inode *dir,
struct dentry *new_dentry)
{
if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry))))
return 0;
return call_int_hook(inode_link, old_dentry, dir, new_dentry);
}
/**
* security_inode_unlink() - Check if removing a hard link is allowed
* @dir: parent directory
* @dentry: file
*
* Check the permission to remove a hard link to a file.
*
* Return: Returns 0 if permission is granted.
*/
int security_inode_unlink(struct inode *dir, struct dentry *dentry)
{
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
return 0;
return call_int_hook(inode_unlink, dir, dentry);
}
/**
* security_inode_symlink() - Check if creating a symbolic link is allowed
* @dir: parent directory
* @dentry: symbolic link
* @old_name: existing filename
*
* Check the permission to create a symbolic link to a file.
*
* Return: Returns 0 if permission is granted.
*/
int security_inode_symlink(struct inode *dir, struct dentry *dentry,
const char *old_name)
{
if (unlikely(IS_PRIVATE(dir)))
return 0;
return call_int_hook(inode_symlink, dir, dentry, old_name);
}
/**
* security_inode_mkdir() - Check if creation a new director is allowed
* @dir: parent directory
* @dentry: new directory
* @mode: new directory mode
*
* Check permissions to create a new directory in the existing directory
* associated with inode structure @dir.
*
* Return: Returns 0 if permission is granted.
*/
int security_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
{
if (unlikely(IS_PRIVATE(dir)))
return 0;
return call_int_hook(inode_mkdir, dir, dentry, mode);
}
EXPORT_SYMBOL_GPL(security_inode_mkdir);
/**
* security_inode_rmdir() - Check if removing a directory is allowed
* @dir: parent directory
* @dentry: directory to be removed
*
* Check the permission to remove a directory.
*
* Return: Returns 0 if permission is granted.
*/
int security_inode_rmdir(struct inode *dir, struct dentry *dentry)
{
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
return 0;
return call_int_hook(inode_rmdir, dir, dentry);
}
/**
* security_inode_mknod() - Check if creating a special file is allowed
* @dir: parent directory
* @dentry: new file
* @mode: new file mode
* @dev: device number
*
* Check permissions when creating a special file (or a socket or a fifo file
* created via the mknod system call). Note that if mknod operation is being
* done for a regular file, then the create hook will be called and not this
* hook.
*
* Return: Returns 0 if permission is granted.
*/
int security_inode_mknod(struct inode *dir, struct dentry *dentry,
umode_t mode, dev_t dev)
{
if (unlikely(IS_PRIVATE(dir)))
return 0;
return call_int_hook(inode_mknod, dir, dentry, mode, dev);
}
/**
* security_inode_rename() - Check if renaming a file is allowed
* @old_dir: parent directory of the old file
* @old_dentry: the old file
* @new_dir: parent directory of the new file
* @new_dentry: the new file
* @flags: flags
*
* Check for permission to rename a file or directory.
*
* Return: Returns 0 if permission is granted.
*/
int security_inode_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry,
unsigned int flags)
{
if (unlikely(IS_PRIVATE(d_backing_inode(old_dentry)) ||
(d_is_positive(new_dentry) &&
IS_PRIVATE(d_backing_inode(new_dentry)))))
return 0;
if (flags & RENAME_EXCHANGE) {
int err = call_int_hook(inode_rename, new_dir, new_dentry,
old_dir, old_dentry);
if (err)
return err;
}
return call_int_hook(inode_rename, old_dir, old_dentry,
new_dir, new_dentry);
}
/**
* security_inode_readlink() - Check if reading a symbolic link is allowed
* @dentry: link
*
* Check the permission to read the symbolic link.
*
* Return: Returns 0 if permission is granted.
*/
int security_inode_readlink(struct dentry *dentry)
{
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
return 0;
return call_int_hook(inode_readlink, dentry);
}
/**
* security_inode_follow_link() - Check if following a symbolic link is allowed
* @dentry: link dentry
* @inode: link inode
* @rcu: true if in RCU-walk mode
*
* Check permission to follow a symbolic link when looking up a pathname. If
* @rcu is true, @inode is not stable.
*
* Return: Returns 0 if permission is granted.
*/
int security_inode_follow_link(struct dentry *dentry, struct inode *inode,
bool rcu)
{
if (unlikely(IS_PRIVATE(inode)))
return 0;
return call_int_hook(inode_follow_link, dentry, inode, rcu);
}
/**
* security_inode_permission() - Check if accessing an inode is allowed
* @inode: inode
* @mask: access mask
*
* Check permission before accessing an inode. This hook is called by the
* existing Linux permission function, so a security module can use it to
* provide additional checking for existing Linux permission checks. Notice
* that this hook is called when a file is opened (as well as many other
* operations), whereas the file_security_ops permission hook is called when
* the actual read/write operations are performed.
*
* Return: Returns 0 if permission is granted.
*/
int security_inode_permission(struct inode *inode, int mask)
{
if (unlikely(IS_PRIVATE(inode)))
return 0;
return call_int_hook(inode_permission, inode, mask);
}
/**
* security_inode_setattr() - Check if setting file attributes is allowed
* @idmap: idmap of the mount
* @dentry: file
* @attr: new attributes
*
* Check permission before setting file attributes. Note that the kernel call
* to notify_change is performed from several locations, whenever file
* attributes change (such as when a file is truncated, chown/chmod operations,
* transferring disk quotas, etc).
*
* Return: Returns 0 if permission is granted.
*/
int security_inode_setattr(struct mnt_idmap *idmap,
struct dentry *dentry, struct iattr *attr)
{
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
return 0;
return call_int_hook(inode_setattr, idmap, dentry, attr);
}
EXPORT_SYMBOL_GPL(security_inode_setattr);
/**
* security_inode_post_setattr() - Update the inode after a setattr operation
* @idmap: idmap of the mount
* @dentry: file
* @ia_valid: file attributes set
*
* Update inode security field after successful setting file attributes.
*/
void security_inode_post_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
int ia_valid)
{
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
return;
call_void_hook(inode_post_setattr, idmap, dentry, ia_valid);
}
/**
* security_inode_getattr() - Check if getting file attributes is allowed
* @path: file
*
* Check permission before obtaining file attributes.
*
* Return: Returns 0 if permission is granted.
*/
int security_inode_getattr(const struct path *path)
{
if (unlikely(IS_PRIVATE(d_backing_inode(path->dentry))))
return 0;
return call_int_hook(inode_getattr, path);
}
/**
* security_inode_setxattr() - Check if setting file xattrs is allowed
* @idmap: idmap of the mount
* @dentry: file
* @name: xattr name
* @value: xattr value
* @size: size of xattr value
* @flags: flags
*
* This hook performs the desired permission checks before setting the extended
* attributes (xattrs) on @dentry. It is important to note that we have some
* additional logic before the main LSM implementation calls to detect if we
* need to perform an additional capability check at the LSM layer.
*
* Normally we enforce a capability check prior to executing the various LSM
* hook implementations, but if a LSM wants to avoid this capability check,
* it can register a 'inode_xattr_skipcap' hook and return a value of 1 for
* xattrs that it wants to avoid the capability check, leaving the LSM fully
* responsible for enforcing the access control for the specific xattr. If all
* of the enabled LSMs refrain from registering a 'inode_xattr_skipcap' hook,
* or return a 0 (the default return value), the capability check is still
* performed. If no 'inode_xattr_skipcap' hooks are registered the capability
* check is performed.
*
* Return: Returns 0 if permission is granted.
*/
int security_inode_setxattr(struct mnt_idmap *idmap,
struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
int rc;
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
return 0;
/* enforce the capability checks at the lsm layer, if needed */
if (!call_int_hook(inode_xattr_skipcap, name)) {
rc = cap_inode_setxattr(dentry, name, value, size, flags);
if (rc)
return rc;
}
return call_int_hook(inode_setxattr, idmap, dentry, name, value, size,
flags);
}
/**
* security_inode_set_acl() - Check if setting posix acls is allowed
* @idmap: idmap of the mount
* @dentry: file
* @acl_name: acl name
* @kacl: acl struct
*
* Check permission before setting posix acls, the posix acls in @kacl are
* identified by @acl_name.
*
* Return: Returns 0 if permission is granted.
*/
int security_inode_set_acl(struct mnt_idmap *idmap,
struct dentry *dentry, const char *acl_name,
struct posix_acl *kacl)
{
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
return 0;
return call_int_hook(inode_set_acl, idmap, dentry, acl_name, kacl);
}
/**
* security_inode_post_set_acl() - Update inode security from posix acls set
* @dentry: file
* @acl_name: acl name
* @kacl: acl struct
*
* Update inode security data after successfully setting posix acls on @dentry.
* The posix acls in @kacl are identified by @acl_name.
*/
void security_inode_post_set_acl(struct dentry *dentry, const char *acl_name,
struct posix_acl *kacl)
{
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
return;
call_void_hook(inode_post_set_acl, dentry, acl_name, kacl);
}
/**
* security_inode_get_acl() - Check if reading posix acls is allowed
* @idmap: idmap of the mount
* @dentry: file
* @acl_name: acl name
*
* Check permission before getting osix acls, the posix acls are identified by
* @acl_name.
*
* Return: Returns 0 if permission is granted.
*/
int security_inode_get_acl(struct mnt_idmap *idmap,
struct dentry *dentry, const char *acl_name)
{
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
return 0;
return call_int_hook(inode_get_acl, idmap, dentry, acl_name);
}
/**
* security_inode_remove_acl() - Check if removing a posix acl is allowed
* @idmap: idmap of the mount
* @dentry: file
* @acl_name: acl name
*
* Check permission before removing posix acls, the posix acls are identified
* by @acl_name.
*
* Return: Returns 0 if permission is granted.
*/
int security_inode_remove_acl(struct mnt_idmap *idmap,
struct dentry *dentry, const char *acl_name)
{
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
return 0;
return call_int_hook(inode_remove_acl, idmap, dentry, acl_name);
}
/**
* security_inode_post_remove_acl() - Update inode security after rm posix acls
* @idmap: idmap of the mount
* @dentry: file
* @acl_name: acl name
*
* Update inode security data after successfully removing posix acls on
* @dentry in @idmap. The posix acls are identified by @acl_name.
*/
void security_inode_post_remove_acl(struct mnt_idmap *idmap,
struct dentry *dentry, const char *acl_name)
{
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
return;
call_void_hook(inode_post_remove_acl, idmap, dentry, acl_name);
}
/**
* security_inode_post_setxattr() - Update the inode after a setxattr operation
* @dentry: file
* @name: xattr name
* @value: xattr value
* @size: xattr value size
* @flags: flags
*
* Update inode security field after successful setxattr operation.
*/
void security_inode_post_setxattr(struct dentry *dentry, const char *name,
const void *value, size_t size, int flags)
{
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
return;
call_void_hook(inode_post_setxattr, dentry, name, value, size, flags);
}
/**
* security_inode_getxattr() - Check if xattr access is allowed
* @dentry: file
* @name: xattr name
*
* Check permission before obtaining the extended attributes identified by
* @name for @dentry.
*
* Return: Returns 0 if permission is granted.
*/
int security_inode_getxattr(struct dentry *dentry, const char *name)
{
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
return 0;
return call_int_hook(inode_getxattr, dentry, name);
}
/**
* security_inode_listxattr() - Check if listing xattrs is allowed
* @dentry: file
*
* Check permission before obtaining the list of extended attribute names for
* @dentry.
*
* Return: Returns 0 if permission is granted.
*/
int security_inode_listxattr(struct dentry *dentry)
{
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
return 0;
return call_int_hook(inode_listxattr, dentry);
}
/**
* security_inode_removexattr() - Check if removing an xattr is allowed
* @idmap: idmap of the mount
* @dentry: file
* @name: xattr name
*
* This hook performs the desired permission checks before setting the extended
* attributes (xattrs) on @dentry. It is important to note that we have some
* additional logic before the main LSM implementation calls to detect if we
* need to perform an additional capability check at the LSM layer.
*
* Normally we enforce a capability check prior to executing the various LSM
* hook implementations, but if a LSM wants to avoid this capability check,
* it can register a 'inode_xattr_skipcap' hook and return a value of 1 for
* xattrs that it wants to avoid the capability check, leaving the LSM fully
* responsible for enforcing the access control for the specific xattr. If all
* of the enabled LSMs refrain from registering a 'inode_xattr_skipcap' hook,
* or return a 0 (the default return value), the capability check is still
* performed. If no 'inode_xattr_skipcap' hooks are registered the capability
* check is performed.
*
* Return: Returns 0 if permission is granted.
*/
int security_inode_removexattr(struct mnt_idmap *idmap,
struct dentry *dentry, const char *name)
{
int rc;
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
return 0;
/* enforce the capability checks at the lsm layer, if needed */
if (!call_int_hook(inode_xattr_skipcap, name)) {
rc = cap_inode_removexattr(idmap, dentry, name);
if (rc)
return rc;
}
return call_int_hook(inode_removexattr, idmap, dentry, name);
}
/**
* security_inode_post_removexattr() - Update the inode after a removexattr op
* @dentry: file
* @name: xattr name
*
* Update the inode after a successful removexattr operation.
*/
void security_inode_post_removexattr(struct dentry *dentry, const char *name)
{
if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
return;
call_void_hook(inode_post_removexattr, dentry, name);
}
/**
* security_inode_need_killpriv() - Check if security_inode_killpriv() required
* @dentry: associated dentry
*
* Called when an inode has been changed to determine if
* security_inode_killpriv() should be called.
*
* Return: Return <0 on error to abort the inode change operation, return 0 if
* security_inode_killpriv() does not need to be called, return >0 if
* security_inode_killpriv() does need to be called.
*/
int security_inode_need_killpriv(struct dentry *dentry)
{
return call_int_hook(inode_need_killpriv, dentry);
}
/**
* security_inode_killpriv() - The setuid bit is removed, update LSM state
* @idmap: idmap of the mount
* @dentry: associated dentry
*
* The @dentry's setuid bit is being removed. Remove similar security labels.
* Called with the dentry->d_inode->i_mutex held.
*
* Return: Return 0 on success. If error is returned, then the operation
* causing setuid bit removal is failed.
*/
int security_inode_killpriv(struct mnt_idmap *idmap,
struct dentry *dentry)
{
return call_int_hook(inode_killpriv, idmap, dentry);
}
/**
* security_inode_getsecurity() - Get the xattr security label of an inode
* @idmap: idmap of the mount
* @inode: inode
* @name: xattr name
* @buffer: security label buffer
* @alloc: allocation flag
*
* Retrieve a copy of the extended attribute representation of the security
* label associated with @name for @inode via @buffer. Note that @name is the
* remainder of the attribute name after the security prefix has been removed.
* @alloc is used to specify if the call should return a value via the buffer
* or just the value length.
*
* Return: Returns size of buffer on success.
*/
int security_inode_getsecurity(struct mnt_idmap *idmap,
struct inode *inode, const char *name,
void **buffer, bool alloc)
{
if (unlikely(IS_PRIVATE(inode)))
return LSM_RET_DEFAULT(inode_getsecurity);
return call_int_hook(inode_getsecurity, idmap, inode, name, buffer,
alloc);
}
/**
* security_inode_setsecurity() - Set the xattr security label of an inode
* @inode: inode
* @name: xattr name
* @value: security label
* @size: length of security label
* @flags: flags
*
* Set the security label associated with @name for @inode from the extended
* attribute value @value. @size indicates the size of the @value in bytes.
* @flags may be XATTR_CREATE, XATTR_REPLACE, or 0. Note that @name is the
* remainder of the attribute name after the security. prefix has been removed.
*
* Return: Returns 0 on success.
*/
int security_inode_setsecurity(struct inode *inode, const char *name,
const void *value, size_t size, int flags)
{
if (unlikely(IS_PRIVATE(inode)))
return LSM_RET_DEFAULT(inode_setsecurity);
return call_int_hook(inode_setsecurity, inode, name, value, size,
flags);
}
/**
* security_inode_listsecurity() - List the xattr security label names
* @inode: inode
* @buffer: buffer
* @buffer_size: size of buffer
*
* Copy the extended attribute names for the security labels associated with
* @inode into @buffer. The maximum size of @buffer is specified by
* @buffer_size. @buffer may be NULL to request the size of the buffer
* required.
*
* Return: Returns number of bytes used/required on success.
*/
int security_inode_listsecurity(struct inode *inode,
char *buffer, size_t buffer_size)
{
if (unlikely(IS_PRIVATE(inode)))
return 0;
return call_int_hook(inode_listsecurity, inode, buffer, buffer_size);
}
EXPORT_SYMBOL(security_inode_listsecurity);
/**
* security_inode_getsecid() - Get an inode's secid
* @inode: inode
* @secid: secid to return
*
* Get the secid associated with the node. In case of failure, @secid will be
* set to zero.
*/
void security_inode_getsecid(struct inode *inode, u32 *secid)
{
call_void_hook(inode_getsecid, inode, secid);
}
/**
* security_inode_copy_up() - Create new creds for an overlayfs copy-up op
* @src: union dentry of copy-up file
* @new: newly created creds
*
* A file is about to be copied up from lower layer to upper layer of overlay
* filesystem. Security module can prepare a set of new creds and modify as
* need be and return new creds. Caller will switch to new creds temporarily to
* create new file and release newly allocated creds.
*
* Return: Returns 0 on success or a negative error code on error.
*/
int security_inode_copy_up(struct dentry *src, struct cred **new)
{
return call_int_hook(inode_copy_up, src, new);
}
EXPORT_SYMBOL(security_inode_copy_up);
/**
* security_inode_copy_up_xattr() - Filter xattrs in an overlayfs copy-up op
* @src: union dentry of copy-up file
* @name: xattr name
*
* Filter the xattrs being copied up when a unioned file is copied up from a
* lower layer to the union/overlay layer. The caller is responsible for
* reading and writing the xattrs, this hook is merely a filter.
*
* Return: Returns 0 to accept the xattr, -ECANCELED to discard the xattr,
* -EOPNOTSUPP if the security module does not know about attribute,
* or a negative error code to abort the copy up.
*/
int security_inode_copy_up_xattr(struct dentry *src, const char *name)
{
int rc;
rc = call_int_hook(inode_copy_up_xattr, src, name);
if (rc != LSM_RET_DEFAULT(inode_copy_up_xattr))
return rc;
return LSM_RET_DEFAULT(inode_copy_up_xattr);
}
EXPORT_SYMBOL(security_inode_copy_up_xattr);
/**
* security_inode_setintegrity() - Set the inode's integrity data
* @inode: inode
* @type: type of integrity, e.g. hash digest, signature, etc
* @value: the integrity value
* @size: size of the integrity value
*
* Register a verified integrity measurement of a inode with LSMs.
* LSMs should free the previously saved data if @value is NULL.
*
* Return: Returns 0 on success, negative values on failure.
*/
int security_inode_setintegrity(const struct inode *inode,
enum lsm_integrity_type type, const void *value,
size_t size)
{
return call_int_hook(inode_setintegrity, inode, type, value, size);
}
EXPORT_SYMBOL(security_inode_setintegrity);
/**
* security_kernfs_init_security() - Init LSM context for a kernfs node
* @kn_dir: parent kernfs node
* @kn: the kernfs node to initialize
*
* Initialize the security context of a newly created kernfs node based on its
* own and its parent's attributes.
*
* Return: Returns 0 if permission is granted.
*/
int security_kernfs_init_security(struct kernfs_node *kn_dir,
struct kernfs_node *kn)
{
return call_int_hook(kernfs_init_security, kn_dir, kn);
}
/**
* security_file_permission() - Check file permissions
* @file: file
* @mask: requested permissions
*
* Check file permissions before accessing an open file. This hook is called
* by various operations that read or write files. A security module can use
* this hook to perform additional checking on these operations, e.g. to
* revalidate permissions on use to support privilege bracketing or policy
* changes. Notice that this hook is used when the actual read/write
* operations are performed, whereas the inode_security_ops hook is called when
* a file is opened (as well as many other operations). Although this hook can
* be used to revalidate permissions for various system call operations that
* read or write files, it does not address the revalidation of permissions for
* memory-mapped files. Security modules must handle this separately if they
* need such revalidation.
*
* Return: Returns 0 if permission is granted.
*/
int security_file_permission(struct file *file, int mask)
{
return call_int_hook(file_permission, file, mask);
}
/**
* security_file_alloc() - Allocate and init a file's LSM blob
* @file: the file
*
* Allocate and attach a security structure to the file->f_security field. The
* security field is initialized to NULL when the structure is first created.
*
* Return: Return 0 if the hook is successful and permission is granted.
*/
int security_file_alloc(struct file *file)
{
int rc = lsm_file_alloc(file);
if (rc)
return rc;
rc = call_int_hook(file_alloc_security, file);
if (unlikely(rc))
security_file_free(file);
return rc;
}
/**
* security_file_release() - Perform actions before releasing the file ref
* @file: the file
*
* Perform actions before releasing the last reference to a file.
*/
void security_file_release(struct file *file)
{
call_void_hook(file_release, file);
}
/**
* security_file_free() - Free a file's LSM blob
* @file: the file
*
* Deallocate and free any security structures stored in file->f_security.
*/
void security_file_free(struct file *file)
{
void *blob;
call_void_hook(file_free_security, file);
blob = file->f_security;
if (blob) {
file->f_security = NULL;
kmem_cache_free(lsm_file_cache, blob);
}
}
/**
* security_file_ioctl() - Check if an ioctl is allowed
* @file: associated file
* @cmd: ioctl cmd
* @arg: ioctl arguments
*
* Check permission for an ioctl operation on @file. Note that @arg sometimes
* represents a user space pointer; in other cases, it may be a simple integer
* value. When @arg represents a user space pointer, it should never be used
* by the security module.
*
* Return: Returns 0 if permission is granted.
*/
int security_file_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
return call_int_hook(file_ioctl, file, cmd, arg);
}
EXPORT_SYMBOL_GPL(security_file_ioctl);
/**
* security_file_ioctl_compat() - Check if an ioctl is allowed in compat mode
* @file: associated file
* @cmd: ioctl cmd
* @arg: ioctl arguments
*
* Compat version of security_file_ioctl() that correctly handles 32-bit
* processes running on 64-bit kernels.
*
* Return: Returns 0 if permission is granted.
*/
int security_file_ioctl_compat(struct file *file, unsigned int cmd,
unsigned long arg)
{
return call_int_hook(file_ioctl_compat, file, cmd, arg);
}
EXPORT_SYMBOL_GPL(security_file_ioctl_compat);
static inline unsigned long mmap_prot(struct file *file, unsigned long prot)
{
/*
* Does we have PROT_READ and does the application expect
* it to imply PROT_EXEC? If not, nothing to talk about...
*/
if ((prot & (PROT_READ | PROT_EXEC)) != PROT_READ)
return prot;
if (!(current->personality & READ_IMPLIES_EXEC))
return prot;
/*
* if that's an anonymous mapping, let it.
*/
if (!file)
return prot | PROT_EXEC;
/*
* ditto if it's not on noexec mount, except that on !MMU we need
* NOMMU_MAP_EXEC (== VM_MAYEXEC) in this case
*/
if (!path_noexec(&file->f_path)) {
#ifndef CONFIG_MMU
if (file->f_op->mmap_capabilities) {
unsigned caps = file->f_op->mmap_capabilities(file);
if (!(caps & NOMMU_MAP_EXEC))
return prot;
}
#endif
return prot | PROT_EXEC;
}
/* anything on noexec mount won't get PROT_EXEC */
return prot;
}
/**
* security_mmap_file() - Check if mmap'ing a file is allowed
* @file: file
* @prot: protection applied by the kernel
* @flags: flags
*
* Check permissions for a mmap operation. The @file may be NULL, e.g. if
* mapping anonymous memory.
*
* Return: Returns 0 if permission is granted.
*/
int security_mmap_file(struct file *file, unsigned long prot,
unsigned long flags)
{
return call_int_hook(mmap_file, file, prot, mmap_prot(file, prot),
flags);
}
/**
* security_mmap_addr() - Check if mmap'ing an address is allowed
* @addr: address
*
* Check permissions for a mmap operation at @addr.
*
* Return: Returns 0 if permission is granted.
*/
int security_mmap_addr(unsigned long addr)
{
return call_int_hook(mmap_addr, addr);
}
/**
* security_file_mprotect() - Check if changing memory protections is allowed
* @vma: memory region
* @reqprot: application requested protection
* @prot: protection applied by the kernel
*
* Check permissions before changing memory access permissions.
*
* Return: Returns 0 if permission is granted.
*/
int security_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot,
unsigned long prot)
{
return call_int_hook(file_mprotect, vma, reqprot, prot);
}
/**
* security_file_lock() - Check if a file lock is allowed
* @file: file
* @cmd: lock operation (e.g. F_RDLCK, F_WRLCK)
*
* Check permission before performing file locking operations. Note the hook
* mediates both flock and fcntl style locks.
*
* Return: Returns 0 if permission is granted.
*/
int security_file_lock(struct file *file, unsigned int cmd)
{
return call_int_hook(file_lock, file, cmd);
}
/**
* security_file_fcntl() - Check if fcntl() op is allowed
* @file: file
* @cmd: fcntl command
* @arg: command argument
*
* Check permission before allowing the file operation specified by @cmd from
* being performed on the file @file. Note that @arg sometimes represents a
* user space pointer; in other cases, it may be a simple integer value. When
* @arg represents a user space pointer, it should never be used by the
* security module.
*
* Return: Returns 0 if permission is granted.
*/
int security_file_fcntl(struct file *file, unsigned int cmd, unsigned long arg)
{
return call_int_hook(file_fcntl, file, cmd, arg);
}
/**
* security_file_set_fowner() - Set the file owner info in the LSM blob
* @file: the file
*
* Save owner security information (typically from current->security) in
* file->f_security for later use by the send_sigiotask hook.
*
* This hook is called with file->f_owner.lock held.
*
* Return: Returns 0 on success.
*/
void security_file_set_fowner(struct file *file)
{
call_void_hook(file_set_fowner, file);
}
/**
* security_file_send_sigiotask() - Check if sending SIGIO/SIGURG is allowed
* @tsk: target task
* @fown: signal sender
* @sig: signal to be sent, SIGIO is sent if 0
*
* Check permission for the file owner @fown to send SIGIO or SIGURG to the
* process @tsk. Note that this hook is sometimes called from interrupt. Note
* that the fown_struct, @fown, is never outside the context of a struct file,
* so the file structure (and associated security information) can always be
* obtained: container_of(fown, struct file, f_owner).
*
* Return: Returns 0 if permission is granted.
*/
int security_file_send_sigiotask(struct task_struct *tsk,
struct fown_struct *fown, int sig)
{
return call_int_hook(file_send_sigiotask, tsk, fown, sig);
}
/**
* security_file_receive() - Check if receiving a file via IPC is allowed
* @file: file being received
*
* This hook allows security modules to control the ability of a process to
* receive an open file descriptor via socket IPC.
*
* Return: Returns 0 if permission is granted.
*/
int security_file_receive(struct file *file)
{
return call_int_hook(file_receive, file);
}
/**
* security_file_open() - Save open() time state for late use by the LSM
* @file:
*
* Save open-time permission checking state for later use upon file_permission,
* and recheck access if anything has changed since inode_permission.
*
* Return: Returns 0 if permission is granted.
*/
int security_file_open(struct file *file)
{
int ret;
ret = call_int_hook(file_open, file);
if (ret)
return ret;
return fsnotify_open_perm(file);
}
/**
* security_file_post_open() - Evaluate a file after it has been opened
* @file: the file
* @mask: access mask
*
* Evaluate an opened file and the access mask requested with open(). The hook
* is useful for LSMs that require the file content to be available in order to
* make decisions.
*
* Return: Returns 0 if permission is granted.
*/
int security_file_post_open(struct file *file, int mask)
{
return call_int_hook(file_post_open, file, mask);
}
EXPORT_SYMBOL_GPL(security_file_post_open);
/**
* security_file_truncate() - Check if truncating a file is allowed
* @file: file
*
* Check permission before truncating a file, i.e. using ftruncate. Note that
* truncation permission may also be checked based on the path, using the
* @path_truncate hook.
*
* Return: Returns 0 if permission is granted.
*/
int security_file_truncate(struct file *file)
{
return call_int_hook(file_truncate, file);
}
/**
* security_task_alloc() - Allocate a task's LSM blob
* @task: the task
* @clone_flags: flags indicating what is being shared
*
* Handle allocation of task-related resources.
*
* Return: Returns a zero on success, negative values on failure.
*/
int security_task_alloc(struct task_struct *task, unsigned long clone_flags)
{
int rc = lsm_task_alloc(task);
if (rc)
return rc;
rc = call_int_hook(task_alloc, task, clone_flags);
if (unlikely(rc))
security_task_free(task);
return rc;
}
/**
* security_task_free() - Free a task's LSM blob and related resources
* @task: task
*
* Handle release of task-related resources. Note that this can be called from
* interrupt context.
*/
void security_task_free(struct task_struct *task)
{
call_void_hook(task_free, task);
kfree(task->security);
task->security = NULL;
}
/**
* security_cred_alloc_blank() - Allocate the min memory to allow cred_transfer
* @cred: credentials
* @gfp: gfp flags
*
* Only allocate sufficient memory and attach to @cred such that
* cred_transfer() will not get ENOMEM.
*
* Return: Returns 0 on success, negative values on failure.
*/
int security_cred_alloc_blank(struct cred *cred, gfp_t gfp)
{
int rc = lsm_cred_alloc(cred, gfp);
if (rc)
return rc;
rc = call_int_hook(cred_alloc_blank, cred, gfp);
if (unlikely(rc))
security_cred_free(cred);
return rc;
}
/**
* security_cred_free() - Free the cred's LSM blob and associated resources
* @cred: credentials
*
* Deallocate and clear the cred->security field in a set of credentials.
*/
void security_cred_free(struct cred *cred)
{
/*
* There is a failure case in prepare_creds() that
* may result in a call here with ->security being NULL.
*/
if (unlikely(cred->security == NULL))
return;
call_void_hook(cred_free, cred);
kfree(cred->security);
cred->security = NULL;
}
/**
* security_prepare_creds() - Prepare a new set of credentials
* @new: new credentials
* @old: original credentials
* @gfp: gfp flags
*
* Prepare a new set of credentials by copying the data from the old set.
*
* Return: Returns 0 on success, negative values on failure.
*/
int security_prepare_creds(struct cred *new, const struct cred *old, gfp_t gfp)
{
int rc = lsm_cred_alloc(new, gfp);
if (rc)
return rc;
rc = call_int_hook(cred_prepare, new, old, gfp);
if (unlikely(rc))
security_cred_free(new);
return rc;
}
/**
* security_transfer_creds() - Transfer creds
* @new: target credentials
* @old: original credentials
*
* Transfer data from original creds to new creds.
*/
void security_transfer_creds(struct cred *new, const struct cred *old)
{
call_void_hook(cred_transfer, new, old);
}
/**
* security_cred_getsecid() - Get the secid from a set of credentials
* @c: credentials
* @secid: secid value
*
* Retrieve the security identifier of the cred structure @c. In case of
* failure, @secid will be set to zero.
*/
void security_cred_getsecid(const struct cred *c, u32 *secid)
{
*secid = 0;
call_void_hook(cred_getsecid, c, secid);
}
EXPORT_SYMBOL(security_cred_getsecid);
/**
* security_kernel_act_as() - Set the kernel credentials to act as secid
* @new: credentials
* @secid: secid
*
* Set the credentials for a kernel service to act as (subjective context).
* The current task must be the one that nominated @secid.
*
* Return: Returns 0 if successful.
*/
int security_kernel_act_as(struct cred *new, u32 secid)
{
return call_int_hook(kernel_act_as, new, secid);
}
/**
* security_kernel_create_files_as() - Set file creation context using an inode
* @new: target credentials
* @inode: reference inode
*
* Set the file creation context in a set of credentials to be the same as the
* objective context of the specified inode. The current task must be the one
* that nominated @inode.
*
* Return: Returns 0 if successful.
*/
int security_kernel_create_files_as(struct cred *new, struct inode *inode)
{
return call_int_hook(kernel_create_files_as, new, inode);
}
/**
* security_kernel_module_request() - Check if loading a module is allowed
* @kmod_name: module name
*
* Ability to trigger the kernel to automatically upcall to userspace for
* userspace to load a kernel module with the given name.
*
* Return: Returns 0 if successful.
*/
int security_kernel_module_request(char *kmod_name)
{
return call_int_hook(kernel_module_request, kmod_name);
}
/**
* security_kernel_read_file() - Read a file specified by userspace
* @file: file
* @id: file identifier
* @contents: trust if security_kernel_post_read_file() will be called
*
* Read a file specified by userspace.
*
* Return: Returns 0 if permission is granted.
*/
int security_kernel_read_file(struct file *file, enum kernel_read_file_id id,
bool contents)
{
return call_int_hook(kernel_read_file, file, id, contents);
}
EXPORT_SYMBOL_GPL(security_kernel_read_file);
/**
* security_kernel_post_read_file() - Read a file specified by userspace
* @file: file
* @buf: file contents
* @size: size of file contents
* @id: file identifier
*
* Read a file specified by userspace. This must be paired with a prior call
* to security_kernel_read_file() call that indicated this hook would also be
* called, see security_kernel_read_file() for more information.
*
* Return: Returns 0 if permission is granted.
*/
int security_kernel_post_read_file(struct file *file, char *buf, loff_t size,
enum kernel_read_file_id id)
{
return call_int_hook(kernel_post_read_file, file, buf, size, id);
}
EXPORT_SYMBOL_GPL(security_kernel_post_read_file);
/**
* security_kernel_load_data() - Load data provided by userspace
* @id: data identifier
* @contents: true if security_kernel_post_load_data() will be called
*
* Load data provided by userspace.
*
* Return: Returns 0 if permission is granted.
*/
int security_kernel_load_data(enum kernel_load_data_id id, bool contents)
{
return call_int_hook(kernel_load_data, id, contents);
}
EXPORT_SYMBOL_GPL(security_kernel_load_data);
/**
* security_kernel_post_load_data() - Load userspace data from a non-file source
* @buf: data
* @size: size of data
* @id: data identifier
* @description: text description of data, specific to the id value
*
* Load data provided by a non-file source (usually userspace buffer). This
* must be paired with a prior security_kernel_load_data() call that indicated
* this hook would also be called, see security_kernel_load_data() for more
* information.
*
* Return: Returns 0 if permission is granted.
*/
int security_kernel_post_load_data(char *buf, loff_t size,
enum kernel_load_data_id id,
char *description)
{
return call_int_hook(kernel_post_load_data, buf, size, id, description);
}
EXPORT_SYMBOL_GPL(security_kernel_post_load_data);
/**
* security_task_fix_setuid() - Update LSM with new user id attributes
* @new: updated credentials
* @old: credentials being replaced
* @flags: LSM_SETID_* flag values
*
* Update the module's state after setting one or more of the user identity
* attributes of the current process. The @flags parameter indicates which of
* the set*uid system calls invoked this hook. If @new is the set of
* credentials that will be installed. Modifications should be made to this
* rather than to @current->cred.
*
* Return: Returns 0 on success.
*/
int security_task_fix_setuid(struct cred *new, const struct cred *old,
int flags)
{
return call_int_hook(task_fix_setuid, new, old, flags);
}
/**
* security_task_fix_setgid() - Update LSM with new group id attributes
* @new: updated credentials
* @old: credentials being replaced
* @flags: LSM_SETID_* flag value
*
* Update the module's state after setting one or more of the group identity
* attributes of the current process. The @flags parameter indicates which of
* the set*gid system calls invoked this hook. @new is the set of credentials
* that will be installed. Modifications should be made to this rather than to
* @current->cred.
*
* Return: Returns 0 on success.
*/
int security_task_fix_setgid(struct cred *new, const struct cred *old,
int flags)
{
return call_int_hook(task_fix_setgid, new, old, flags);
}
/**
* security_task_fix_setgroups() - Update LSM with new supplementary groups
* @new: updated credentials
* @old: credentials being replaced
*
* Update the module's state after setting the supplementary group identity
* attributes of the current process. @new is the set of credentials that will
* be installed. Modifications should be made to this rather than to
* @current->cred.
*
* Return: Returns 0 on success.
*/
int security_task_fix_setgroups(struct cred *new, const struct cred *old)
{
return call_int_hook(task_fix_setgroups, new, old);
}
/**
* security_task_setpgid() - Check if setting the pgid is allowed
* @p: task being modified
* @pgid: new pgid
*
* Check permission before setting the process group identifier of the process
* @p to @pgid.
*
* Return: Returns 0 if permission is granted.
*/
int security_task_setpgid(struct task_struct *p, pid_t pgid)
{
return call_int_hook(task_setpgid, p, pgid);
}
/**
* security_task_getpgid() - Check if getting the pgid is allowed
* @p: task
*
* Check permission before getting the process group identifier of the process
* @p.
*
* Return: Returns 0 if permission is granted.
*/
int security_task_getpgid(struct task_struct *p)
{
return call_int_hook(task_getpgid, p);
}
/**
* security_task_getsid() - Check if getting the session id is allowed
* @p: task
*
* Check permission before getting the session identifier of the process @p.
*
* Return: Returns 0 if permission is granted.
*/
int security_task_getsid(struct task_struct *p)
{
return call_int_hook(task_getsid, p);
}
/**
* security_current_getsecid_subj() - Get the current task's subjective secid
* @secid: secid value
*
* Retrieve the subjective security identifier of the current task and return
* it in @secid. In case of failure, @secid will be set to zero.
*/
void security_current_getsecid_subj(u32 *secid)
{
*secid = 0;
call_void_hook(current_getsecid_subj, secid);
}
EXPORT_SYMBOL(security_current_getsecid_subj);
/**
* security_task_getsecid_obj() - Get a task's objective secid
* @p: target task
* @secid: secid value
*
* Retrieve the objective security identifier of the task_struct in @p and
* return it in @secid. In case of failure, @secid will be set to zero.
*/
void security_task_getsecid_obj(struct task_struct *p, u32 *secid)
{
*secid = 0;
call_void_hook(task_getsecid_obj, p, secid);
}
EXPORT_SYMBOL(security_task_getsecid_obj);
/**
* security_task_setnice() - Check if setting a task's nice value is allowed
* @p: target task
* @nice: nice value
*
* Check permission before setting the nice value of @p to @nice.
*
* Return: Returns 0 if permission is granted.
*/
int security_task_setnice(struct task_struct *p, int nice)
{
return call_int_hook(task_setnice, p, nice);
}
/**
* security_task_setioprio() - Check if setting a task's ioprio is allowed
* @p: target task
* @ioprio: ioprio value
*
* Check permission before setting the ioprio value of @p to @ioprio.
*
* Return: Returns 0 if permission is granted.
*/
int security_task_setioprio(struct task_struct *p, int ioprio)
{
return call_int_hook(task_setioprio, p, ioprio);
}
/**
* security_task_getioprio() - Check if getting a task's ioprio is allowed
* @p: task
*
* Check permission before getting the ioprio value of @p.
*
* Return: Returns 0 if permission is granted.
*/
int security_task_getioprio(struct task_struct *p)
{
return call_int_hook(task_getioprio, p);
}
/**
* security_task_prlimit() - Check if get/setting resources limits is allowed
* @cred: current task credentials
* @tcred: target task credentials
* @flags: LSM_PRLIMIT_* flag bits indicating a get/set/both
*
* Check permission before getting and/or setting the resource limits of
* another task.
*
* Return: Returns 0 if permission is granted.
*/
int security_task_prlimit(const struct cred *cred, const struct cred *tcred,
unsigned int flags)
{
return call_int_hook(task_prlimit, cred, tcred, flags);
}
/**
* security_task_setrlimit() - Check if setting a new rlimit value is allowed
* @p: target task's group leader
* @resource: resource whose limit is being set
* @new_rlim: new resource limit
*
* Check permission before setting the resource limits of process @p for
* @resource to @new_rlim. The old resource limit values can be examined by
* dereferencing (p->signal->rlim + resource).
*
* Return: Returns 0 if permission is granted.
*/
int security_task_setrlimit(struct task_struct *p, unsigned int resource,
struct rlimit *new_rlim)
{
return call_int_hook(task_setrlimit, p, resource, new_rlim);
}
/**
* security_task_setscheduler() - Check if setting sched policy/param is allowed
* @p: target task
*
* Check permission before setting scheduling policy and/or parameters of
* process @p.
*
* Return: Returns 0 if permission is granted.
*/
int security_task_setscheduler(struct task_struct *p)
{
return call_int_hook(task_setscheduler, p);
}
/**
* security_task_getscheduler() - Check if getting scheduling info is allowed
* @p: target task
*
* Check permission before obtaining scheduling information for process @p.
*
* Return: Returns 0 if permission is granted.
*/
int security_task_getscheduler(struct task_struct *p)
{
return call_int_hook(task_getscheduler, p);
}
/**
* security_task_movememory() - Check if moving memory is allowed
* @p: task
*
* Check permission before moving memory owned by process @p.
*
* Return: Returns 0 if permission is granted.
*/
int security_task_movememory(struct task_struct *p)
{
return call_int_hook(task_movememory, p);
}
/**
* security_task_kill() - Check if sending a signal is allowed
* @p: target process
* @info: signal information
* @sig: signal value
* @cred: credentials of the signal sender, NULL if @current
*
* Check permission before sending signal @sig to @p. @info can be NULL, the
* constant 1, or a pointer to a kernel_siginfo structure. If @info is 1 or
* SI_FROMKERNEL(info) is true, then the signal should be viewed as coming from
* the kernel and should typically be permitted. SIGIO signals are handled
* separately by the send_sigiotask hook in file_security_ops.
*
* Return: Returns 0 if permission is granted.
*/
int security_task_kill(struct task_struct *p, struct kernel_siginfo *info,
int sig, const struct cred *cred)
{
return call_int_hook(task_kill, p, info, sig, cred);
}
/**
* security_task_prctl() - Check if a prctl op is allowed
* @option: operation
* @arg2: argument
* @arg3: argument
* @arg4: argument
* @arg5: argument
*
* Check permission before performing a process control operation on the
* current process.
*
* Return: Return -ENOSYS if no-one wanted to handle this op, any other value
* to cause prctl() to return immediately with that value.
*/
int security_task_prctl(int option, unsigned long arg2, unsigned long arg3,
unsigned long arg4, unsigned long arg5)
{
int thisrc;
int rc = LSM_RET_DEFAULT(task_prctl);
struct lsm_static_call *scall;
lsm_for_each_hook(scall, task_prctl) {
thisrc = scall->hl->hook.task_prctl(option, arg2, arg3, arg4, arg5);
if (thisrc != LSM_RET_DEFAULT(task_prctl)) {
rc = thisrc;
if (thisrc != 0)
break;
}
}
return rc;
}
/**
* security_task_to_inode() - Set the security attributes of a task's inode
* @p: task
* @inode: inode
*
* Set the security attributes for an inode based on an associated task's
* security attributes, e.g. for /proc/pid inodes.
*/
void security_task_to_inode(struct task_struct *p, struct inode *inode)
{
call_void_hook(task_to_inode, p, inode);
}
/**
* security_create_user_ns() - Check if creating a new userns is allowed
* @cred: prepared creds
*
* Check permission prior to creating a new user namespace.
*
* Return: Returns 0 if successful, otherwise < 0 error code.
*/
int security_create_user_ns(const struct cred *cred)
{
return call_int_hook(userns_create, cred);
}
/**
* security_ipc_permission() - Check if sysv ipc access is allowed
* @ipcp: ipc permission structure
* @flag: requested permissions
*
* Check permissions for access to IPC.
*
* Return: Returns 0 if permission is granted.
*/
int security_ipc_permission(struct kern_ipc_perm *ipcp, short flag)
{
return call_int_hook(ipc_permission, ipcp, flag);
}
/**
* security_ipc_getsecid() - Get the sysv ipc object's secid
* @ipcp: ipc permission structure
* @secid: secid pointer
*
* Get the secid associated with the ipc object. In case of failure, @secid
* will be set to zero.
*/
void security_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
{
*secid = 0;
call_void_hook(ipc_getsecid, ipcp, secid);
}
/**
* security_msg_msg_alloc() - Allocate a sysv ipc message LSM blob
* @msg: message structure
*
* Allocate and attach a security structure to the msg->security field. The
* security field is initialized to NULL when the structure is first created.
*
* Return: Return 0 if operation was successful and permission is granted.
*/
int security_msg_msg_alloc(struct msg_msg *msg)
{
int rc = lsm_msg_msg_alloc(msg);
if (unlikely(rc))
return rc;
rc = call_int_hook(msg_msg_alloc_security, msg);
if (unlikely(rc))
security_msg_msg_free(msg);
return rc;
}
/**
* security_msg_msg_free() - Free a sysv ipc message LSM blob
* @msg: message structure
*
* Deallocate the security structure for this message.
*/
void security_msg_msg_free(struct msg_msg *msg)
{
call_void_hook(msg_msg_free_security, msg);
kfree(msg->security);
msg->security = NULL;
}
/**
* security_msg_queue_alloc() - Allocate a sysv ipc msg queue LSM blob
* @msq: sysv ipc permission structure
*
* Allocate and attach a security structure to @msg. The security field is
* initialized to NULL when the structure is first created.
*
* Return: Returns 0 if operation was successful and permission is granted.
*/
int security_msg_queue_alloc(struct kern_ipc_perm *msq)
{
int rc = lsm_ipc_alloc(msq);
if (unlikely(rc))
return rc;
rc = call_int_hook(msg_queue_alloc_security, msq);
if (unlikely(rc))
security_msg_queue_free(msq);
return rc;
}
/**
* security_msg_queue_free() - Free a sysv ipc msg queue LSM blob
* @msq: sysv ipc permission structure
*
* Deallocate security field @perm->security for the message queue.
*/
void security_msg_queue_free(struct kern_ipc_perm *msq)
{
call_void_hook(msg_queue_free_security, msq);
kfree(msq->security);
msq->security = NULL;
}
/**
* security_msg_queue_associate() - Check if a msg queue operation is allowed
* @msq: sysv ipc permission structure
* @msqflg: operation flags
*
* Check permission when a message queue is requested through the msgget system
* call. This hook is only called when returning the message queue identifier
* for an existing message queue, not when a new message queue is created.
*
* Return: Return 0 if permission is granted.
*/
int security_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg)
{
return call_int_hook(msg_queue_associate, msq, msqflg);
}
/**
* security_msg_queue_msgctl() - Check if a msg queue operation is allowed
* @msq: sysv ipc permission structure
* @cmd: operation
*
* Check permission when a message control operation specified by @cmd is to be
* performed on the message queue with permissions.
*
* Return: Returns 0 if permission is granted.
*/
int security_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd)
{
return call_int_hook(msg_queue_msgctl, msq, cmd);
}
/**
* security_msg_queue_msgsnd() - Check if sending a sysv ipc message is allowed
* @msq: sysv ipc permission structure
* @msg: message
* @msqflg: operation flags
*
* Check permission before a message, @msg, is enqueued on the message queue
* with permissions specified in @msq.
*
* Return: Returns 0 if permission is granted.
*/
int security_msg_queue_msgsnd(struct kern_ipc_perm *msq,
struct msg_msg *msg, int msqflg)
{
return call_int_hook(msg_queue_msgsnd, msq, msg, msqflg);
}
/**
* security_msg_queue_msgrcv() - Check if receiving a sysv ipc msg is allowed
* @msq: sysv ipc permission structure
* @msg: message
* @target: target task
* @type: type of message requested
* @mode: operation flags
*
* Check permission before a message, @msg, is removed from the message queue.
* The @target task structure contains a pointer to the process that will be
* receiving the message (not equal to the current process when inline receives
* are being performed).
*
* Return: Returns 0 if permission is granted.
*/
int security_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *msg,
struct task_struct *target, long type, int mode)
{
return call_int_hook(msg_queue_msgrcv, msq, msg, target, type, mode);
}
/**
* security_shm_alloc() - Allocate a sysv shm LSM blob
* @shp: sysv ipc permission structure
*
* Allocate and attach a security structure to the @shp security field. The
* security field is initialized to NULL when the structure is first created.
*
* Return: Returns 0 if operation was successful and permission is granted.
*/
int security_shm_alloc(struct kern_ipc_perm *shp)
{
int rc = lsm_ipc_alloc(shp);
if (unlikely(rc))
return rc;
rc = call_int_hook(shm_alloc_security, shp);
if (unlikely(rc))
security_shm_free(shp);
return rc;
}
/**
* security_shm_free() - Free a sysv shm LSM blob
* @shp: sysv ipc permission structure
*
* Deallocate the security structure @perm->security for the memory segment.
*/
void security_shm_free(struct kern_ipc_perm *shp)
{
call_void_hook(shm_free_security, shp);
kfree(shp->security);
shp->security = NULL;
}
/**
* security_shm_associate() - Check if a sysv shm operation is allowed
* @shp: sysv ipc permission structure
* @shmflg: operation flags
*
* Check permission when a shared memory region is requested through the shmget
* system call. This hook is only called when returning the shared memory
* region identifier for an existing region, not when a new shared memory
* region is created.
*
* Return: Returns 0 if permission is granted.
*/
int security_shm_associate(struct kern_ipc_perm *shp, int shmflg)
{
return call_int_hook(shm_associate, shp, shmflg);
}
/**
* security_shm_shmctl() - Check if a sysv shm operation is allowed
* @shp: sysv ipc permission structure
* @cmd: operation
*
* Check permission when a shared memory control operation specified by @cmd is
* to be performed on the shared memory region with permissions in @shp.
*
* Return: Return 0 if permission is granted.
*/
int security_shm_shmctl(struct kern_ipc_perm *shp, int cmd)
{
return call_int_hook(shm_shmctl, shp, cmd);
}
/**
* security_shm_shmat() - Check if a sysv shm attach operation is allowed
* @shp: sysv ipc permission structure
* @shmaddr: address of memory region to attach
* @shmflg: operation flags
*
* Check permissions prior to allowing the shmat system call to attach the
* shared memory segment with permissions @shp to the data segment of the
* calling process. The attaching address is specified by @shmaddr.
*
* Return: Returns 0 if permission is granted.
*/
int security_shm_shmat(struct kern_ipc_perm *shp,
char __user *shmaddr, int shmflg)
{
return call_int_hook(shm_shmat, shp, shmaddr, shmflg);
}
/**
* security_sem_alloc() - Allocate a sysv semaphore LSM blob
* @sma: sysv ipc permission structure
*
* Allocate and attach a security structure to the @sma security field. The
* security field is initialized to NULL when the structure is first created.
*
* Return: Returns 0 if operation was successful and permission is granted.
*/
int security_sem_alloc(struct kern_ipc_perm *sma)
{
int rc = lsm_ipc_alloc(sma);
if (unlikely(rc))
return rc;
rc = call_int_hook(sem_alloc_security, sma);
if (unlikely(rc))
security_sem_free(sma);
return rc;
}
/**
* security_sem_free() - Free a sysv semaphore LSM blob
* @sma: sysv ipc permission structure
*
* Deallocate security structure @sma->security for the semaphore.
*/
void security_sem_free(struct kern_ipc_perm *sma)
{
call_void_hook(sem_free_security, sma);
kfree(sma->security);
sma->security = NULL;
}
/**
* security_sem_associate() - Check if a sysv semaphore operation is allowed
* @sma: sysv ipc permission structure
* @semflg: operation flags
*
* Check permission when a semaphore is requested through the semget system
* call. This hook is only called when returning the semaphore identifier for
* an existing semaphore, not when a new one must be created.
*
* Return: Returns 0 if permission is granted.
*/
int security_sem_associate(struct kern_ipc_perm *sma, int semflg)
{
return call_int_hook(sem_associate, sma, semflg);
}
/**
* security_sem_semctl() - Check if a sysv semaphore operation is allowed
* @sma: sysv ipc permission structure
* @cmd: operation
*
* Check permission when a semaphore operation specified by @cmd is to be
* performed on the semaphore.
*
* Return: Returns 0 if permission is granted.
*/
int security_sem_semctl(struct kern_ipc_perm *sma, int cmd)
{
return call_int_hook(sem_semctl, sma, cmd);
}
/**
* security_sem_semop() - Check if a sysv semaphore operation is allowed
* @sma: sysv ipc permission structure
* @sops: operations to perform
* @nsops: number of operations
* @alter: flag indicating changes will be made
*
* Check permissions before performing operations on members of the semaphore
* set. If the @alter flag is nonzero, the semaphore set may be modified.
*
* Return: Returns 0 if permission is granted.
*/
int security_sem_semop(struct kern_ipc_perm *sma, struct sembuf *sops,
unsigned nsops, int alter)
{
return call_int_hook(sem_semop, sma, sops, nsops, alter);
}
/**
* security_d_instantiate() - Populate an inode's LSM state based on a dentry
* @dentry: dentry
* @inode: inode
*
* Fill in @inode security information for a @dentry if allowed.
*/
void security_d_instantiate(struct dentry *dentry, struct inode *inode)
{
if (unlikely(inode && IS_PRIVATE(inode)))
return;
call_void_hook(d_instantiate, dentry, inode);
}
EXPORT_SYMBOL(security_d_instantiate);
/*
* Please keep this in sync with it's counterpart in security/lsm_syscalls.c
*/
/**
* security_getselfattr - Read an LSM attribute of the current process.
* @attr: which attribute to return
* @uctx: the user-space destination for the information, or NULL
* @size: pointer to the size of space available to receive the data
* @flags: special handling options. LSM_FLAG_SINGLE indicates that only
* attributes associated with the LSM identified in the passed @ctx be
* reported.
*
* A NULL value for @uctx can be used to get both the number of attributes
* and the size of the data.
*
* Returns the number of attributes found on success, negative value
* on error. @size is reset to the total size of the data.
* If @size is insufficient to contain the data -E2BIG is returned.
*/
int security_getselfattr(unsigned int attr, struct lsm_ctx __user *uctx,
u32 __user *size, u32 flags)
{
struct lsm_static_call *scall;
struct lsm_ctx lctx = { .id = LSM_ID_UNDEF, };
u8 __user *base = (u8 __user *)uctx;
u32 entrysize;
u32 total = 0;
u32 left;
bool toobig = false;
bool single = false;
int count = 0;
int rc;
if (attr == LSM_ATTR_UNDEF)
return -EINVAL;
if (size == NULL)
return -EINVAL;
if (get_user(left, size))
return -EFAULT;
if (flags) {
/*
* Only flag supported is LSM_FLAG_SINGLE
*/
if (flags != LSM_FLAG_SINGLE || !uctx)
return -EINVAL;
if (copy_from_user(&lctx, uctx, sizeof(lctx)))
return -EFAULT;
/*
* If the LSM ID isn't specified it is an error.
*/
if (lctx.id == LSM_ID_UNDEF)
return -EINVAL;
single = true;
}
/*
* In the usual case gather all the data from the LSMs.
* In the single case only get the data from the LSM specified.
*/
lsm_for_each_hook(scall, getselfattr) {
if (single && lctx.id != scall->hl->lsmid->id)
continue;
entrysize = left;
if (base)
uctx = (struct lsm_ctx __user *)(base + total);
rc = scall->hl->hook.getselfattr(attr, uctx, &entrysize, flags);
if (rc == -EOPNOTSUPP) {
rc = 0;
continue;
}
if (rc == -E2BIG) {
rc = 0;
left = 0;
toobig = true;
} else if (rc < 0)
return rc;
else
left -= entrysize;
total += entrysize;
count += rc;
if (single)
break;
}
if (put_user(total, size))
return -EFAULT;
if (toobig)
return -E2BIG;
if (count == 0)
return LSM_RET_DEFAULT(getselfattr);
return count;
}
/*
* Please keep this in sync with it's counterpart in security/lsm_syscalls.c
*/
/**
* security_setselfattr - Set an LSM attribute on the current process.
* @attr: which attribute to set
* @uctx: the user-space source for the information
* @size: the size of the data
* @flags: reserved for future use, must be 0
*
* Set an LSM attribute for the current process. The LSM, attribute
* and new value are included in @uctx.
*
* Returns 0 on success, -EINVAL if the input is inconsistent, -EFAULT
* if the user buffer is inaccessible, E2BIG if size is too big, or an
* LSM specific failure.
*/
int security_setselfattr(unsigned int attr, struct lsm_ctx __user *uctx,
u32 size, u32 flags)
{
struct lsm_static_call *scall;
struct lsm_ctx *lctx;
int rc = LSM_RET_DEFAULT(setselfattr);
u64 required_len;
if (flags)
return -EINVAL;
if (size < sizeof(*lctx))
return -EINVAL;
if (size > PAGE_SIZE)
return -E2BIG;
lctx = memdup_user(uctx, size);
if (IS_ERR(lctx))
return PTR_ERR(lctx);
if (size < lctx->len ||
check_add_overflow(sizeof(*lctx), lctx->ctx_len, &required_len) ||
lctx->len < required_len) {
rc = -EINVAL;
goto free_out;
}
lsm_for_each_hook(scall, setselfattr)
if ((scall->hl->lsmid->id) == lctx->id) {
rc = scall->hl->hook.setselfattr(attr, lctx, size, flags);
break;
}
free_out:
kfree(lctx);
return rc;
}
/**
* security_getprocattr() - Read an attribute for a task
* @p: the task
* @lsmid: LSM identification
* @name: attribute name
* @value: attribute value
*
* Read attribute @name for task @p and store it into @value if allowed.
*
* Return: Returns the length of @value on success, a negative value otherwise.
*/
int security_getprocattr(struct task_struct *p, int lsmid, const char *name,
char **value)
{
struct lsm_static_call *scall;
lsm_for_each_hook(scall, getprocattr) {
if (lsmid != 0 && lsmid != scall->hl->lsmid->id)
continue;
return scall->hl->hook.getprocattr(p, name, value);
}
return LSM_RET_DEFAULT(getprocattr);
}
/**
* security_setprocattr() - Set an attribute for a task
* @lsmid: LSM identification
* @name: attribute name
* @value: attribute value
* @size: attribute value size
*
* Write (set) the current task's attribute @name to @value, size @size if
* allowed.
*
* Return: Returns bytes written on success, a negative value otherwise.
*/
int security_setprocattr(int lsmid, const char *name, void *value, size_t size)
{
struct lsm_static_call *scall;
lsm_for_each_hook(scall, setprocattr) {
if (lsmid != 0 && lsmid != scall->hl->lsmid->id)
continue;
return scall->hl->hook.setprocattr(name, value, size);
}
return LSM_RET_DEFAULT(setprocattr);
}
/**
* security_netlink_send() - Save info and check if netlink sending is allowed
* @sk: sending socket
* @skb: netlink message
*
* Save security information for a netlink message so that permission checking
* can be performed when the message is processed. The security information
* can be saved using the eff_cap field of the netlink_skb_parms structure.
* Also may be used to provide fine grained control over message transmission.
*
* Return: Returns 0 if the information was successfully saved and message is
* allowed to be transmitted.
*/
int security_netlink_send(struct sock *sk, struct sk_buff *skb)
{
return call_int_hook(netlink_send, sk, skb);
}
/**
* security_ismaclabel() - Check if the named attribute is a MAC label
* @name: full extended attribute name
*
* Check if the extended attribute specified by @name represents a MAC label.
*
* Return: Returns 1 if name is a MAC attribute otherwise returns 0.
*/
int security_ismaclabel(const char *name)
{
return call_int_hook(ismaclabel, name);
}
EXPORT_SYMBOL(security_ismaclabel);
/**
* security_secid_to_secctx() - Convert a secid to a secctx
* @secid: secid
* @secdata: secctx
* @seclen: secctx length
*
* Convert secid to security context. If @secdata is NULL the length of the
* result will be returned in @seclen, but no @secdata will be returned. This
* does mean that the length could change between calls to check the length and
* the next call which actually allocates and returns the @secdata.
*
* Return: Return 0 on success, error on failure.
*/
int security_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
{
return call_int_hook(secid_to_secctx, secid, secdata, seclen);
}
EXPORT_SYMBOL(security_secid_to_secctx);
/**
* security_secctx_to_secid() - Convert a secctx to a secid
* @secdata: secctx
* @seclen: length of secctx
* @secid: secid
*
* Convert security context to secid.
*
* Return: Returns 0 on success, error on failure.
*/
int security_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
{
*secid = 0;
return call_int_hook(secctx_to_secid, secdata, seclen, secid);
}
EXPORT_SYMBOL(security_secctx_to_secid);
/**
* security_release_secctx() - Free a secctx buffer
* @secdata: secctx
* @seclen: length of secctx
*
* Release the security context.
*/
void security_release_secctx(char *secdata, u32 seclen)
{
call_void_hook(release_secctx, secdata, seclen);
}
EXPORT_SYMBOL(security_release_secctx);
/**
* security_inode_invalidate_secctx() - Invalidate an inode's security label
* @inode: inode
*
* Notify the security module that it must revalidate the security context of
* an inode.
*/
void security_inode_invalidate_secctx(struct inode *inode)
{
call_void_hook(inode_invalidate_secctx, inode);
}
EXPORT_SYMBOL(security_inode_invalidate_secctx);
/**
* security_inode_notifysecctx() - Notify the LSM of an inode's security label
* @inode: inode
* @ctx: secctx
* @ctxlen: length of secctx
*
* Notify the security module of what the security context of an inode should
* be. Initializes the incore security context managed by the security module
* for this inode. Example usage: NFS client invokes this hook to initialize
* the security context in its incore inode to the value provided by the server
* for the file when the server returned the file's attributes to the client.
* Must be called with inode->i_mutex locked.
*
* Return: Returns 0 on success, error on failure.
*/
int security_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
{
return call_int_hook(inode_notifysecctx, inode, ctx, ctxlen);
}
EXPORT_SYMBOL(security_inode_notifysecctx);
/**
* security_inode_setsecctx() - Change the security label of an inode
* @dentry: inode
* @ctx: secctx
* @ctxlen: length of secctx
*
* Change the security context of an inode. Updates the incore security
* context managed by the security module and invokes the fs code as needed
* (via __vfs_setxattr_noperm) to update any backing xattrs that represent the
* context. Example usage: NFS server invokes this hook to change the security
* context in its incore inode and on the backing filesystem to a value
* provided by the client on a SETATTR operation. Must be called with
* inode->i_mutex locked.
*
* Return: Returns 0 on success, error on failure.
*/
int security_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
{
return call_int_hook(inode_setsecctx, dentry, ctx, ctxlen);
}
EXPORT_SYMBOL(security_inode_setsecctx);
/**
* security_inode_getsecctx() - Get the security label of an inode
* @inode: inode
* @ctx: secctx
* @ctxlen: length of secctx
*
* On success, returns 0 and fills out @ctx and @ctxlen with the security
* context for the given @inode.
*
* Return: Returns 0 on success, error on failure.
*/
int security_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
{
return call_int_hook(inode_getsecctx, inode, ctx, ctxlen);
}
EXPORT_SYMBOL(security_inode_getsecctx);
#ifdef CONFIG_WATCH_QUEUE
/**
* security_post_notification() - Check if a watch notification can be posted
* @w_cred: credentials of the task that set the watch
* @cred: credentials of the task which triggered the watch
* @n: the notification
*
* Check to see if a watch notification can be posted to a particular queue.
*
* Return: Returns 0 if permission is granted.
*/
int security_post_notification(const struct cred *w_cred,
const struct cred *cred,
struct watch_notification *n)
{
return call_int_hook(post_notification, w_cred, cred, n);
}
#endif /* CONFIG_WATCH_QUEUE */
#ifdef CONFIG_KEY_NOTIFICATIONS
/**
* security_watch_key() - Check if a task is allowed to watch for key events
* @key: the key to watch
*
* Check to see if a process is allowed to watch for event notifications from
* a key or keyring.
*
* Return: Returns 0 if permission is granted.
*/
int security_watch_key(struct key *key)
{
return call_int_hook(watch_key, key);
}
#endif /* CONFIG_KEY_NOTIFICATIONS */
#ifdef CONFIG_SECURITY_NETWORK
/**
* security_unix_stream_connect() - Check if a AF_UNIX stream is allowed
* @sock: originating sock
* @other: peer sock
* @newsk: new sock
*
* Check permissions before establishing a Unix domain stream connection
* between @sock and @other.
*
* The @unix_stream_connect and @unix_may_send hooks were necessary because
* Linux provides an alternative to the conventional file name space for Unix
* domain sockets. Whereas binding and connecting to sockets in the file name
* space is mediated by the typical file permissions (and caught by the mknod
* and permission hooks in inode_security_ops), binding and connecting to
* sockets in the abstract name space is completely unmediated. Sufficient
* control of Unix domain sockets in the abstract name space isn't possible
* using only the socket layer hooks, since we need to know the actual target
* socket, which is not looked up until we are inside the af_unix code.
*
* Return: Returns 0 if permission is granted.
*/
int security_unix_stream_connect(struct sock *sock, struct sock *other,
struct sock *newsk)
{
return call_int_hook(unix_stream_connect, sock, other, newsk);
}
EXPORT_SYMBOL(security_unix_stream_connect);
/**
* security_unix_may_send() - Check if AF_UNIX socket can send datagrams
* @sock: originating sock
* @other: peer sock
*
* Check permissions before connecting or sending datagrams from @sock to
* @other.
*
* The @unix_stream_connect and @unix_may_send hooks were necessary because
* Linux provides an alternative to the conventional file name space for Unix
* domain sockets. Whereas binding and connecting to sockets in the file name
* space is mediated by the typical file permissions (and caught by the mknod
* and permission hooks in inode_security_ops), binding and connecting to
* sockets in the abstract name space is completely unmediated. Sufficient
* control of Unix domain sockets in the abstract name space isn't possible
* using only the socket layer hooks, since we need to know the actual target
* socket, which is not looked up until we are inside the af_unix code.
*
* Return: Returns 0 if permission is granted.
*/
int security_unix_may_send(struct socket *sock, struct socket *other)
{
return call_int_hook(unix_may_send, sock, other);
}
EXPORT_SYMBOL(security_unix_may_send);
/**
* security_socket_create() - Check if creating a new socket is allowed
* @family: protocol family
* @type: communications type
* @protocol: requested protocol
* @kern: set to 1 if a kernel socket is requested
*
* Check permissions prior to creating a new socket.
*
* Return: Returns 0 if permission is granted.
*/
int security_socket_create(int family, int type, int protocol, int kern)
{
return call_int_hook(socket_create, family, type, protocol, kern);
}
/**
* security_socket_post_create() - Initialize a newly created socket
* @sock: socket
* @family: protocol family
* @type: communications type
* @protocol: requested protocol
* @kern: set to 1 if a kernel socket is requested
*
* This hook allows a module to update or allocate a per-socket security
* structure. Note that the security field was not added directly to the socket
* structure, but rather, the socket security information is stored in the
* associated inode. Typically, the inode alloc_security hook will allocate
* and attach security information to SOCK_INODE(sock)->i_security. This hook
* may be used to update the SOCK_INODE(sock)->i_security field with additional
* information that wasn't available when the inode was allocated.
*
* Return: Returns 0 if permission is granted.
*/
int security_socket_post_create(struct socket *sock, int family,
int type, int protocol, int kern)
{
return call_int_hook(socket_post_create, sock, family, type,
protocol, kern);
}
/**
* security_socket_socketpair() - Check if creating a socketpair is allowed
* @socka: first socket
* @sockb: second socket
*
* Check permissions before creating a fresh pair of sockets.
*
* Return: Returns 0 if permission is granted and the connection was
* established.
*/
int security_socket_socketpair(struct socket *socka, struct socket *sockb)
{
return call_int_hook(socket_socketpair, socka, sockb);
}
EXPORT_SYMBOL(security_socket_socketpair);
/**
* security_socket_bind() - Check if a socket bind operation is allowed
* @sock: socket
* @address: requested bind address
* @addrlen: length of address
*
* Check permission before socket protocol layer bind operation is performed
* and the socket @sock is bound to the address specified in the @address
* parameter.
*
* Return: Returns 0 if permission is granted.
*/
int security_socket_bind(struct socket *sock,
struct sockaddr *address, int addrlen)
{
return call_int_hook(socket_bind, sock, address, addrlen);
}
/**
* security_socket_connect() - Check if a socket connect operation is allowed
* @sock: socket
* @address: address of remote connection point
* @addrlen: length of address
*
* Check permission before socket protocol layer connect operation attempts to
* connect socket @sock to a remote address, @address.
*
* Return: Returns 0 if permission is granted.
*/
int security_socket_connect(struct socket *sock,
struct sockaddr *address, int addrlen)
{
return call_int_hook(socket_connect, sock, address, addrlen);
}
/**
* security_socket_listen() - Check if a socket is allowed to listen
* @sock: socket
* @backlog: connection queue size
*
* Check permission before socket protocol layer listen operation.
*
* Return: Returns 0 if permission is granted.
*/
int security_socket_listen(struct socket *sock, int backlog)
{
return call_int_hook(socket_listen, sock, backlog);
}
/**
* security_socket_accept() - Check if a socket is allowed to accept connections
* @sock: listening socket
* @newsock: newly creation connection socket
*
* Check permission before accepting a new connection. Note that the new
* socket, @newsock, has been created and some information copied to it, but
* the accept operation has not actually been performed.
*
* Return: Returns 0 if permission is granted.
*/
int security_socket_accept(struct socket *sock, struct socket *newsock)
{
return call_int_hook(socket_accept, sock, newsock);
}
/**
* security_socket_sendmsg() - Check if sending a message is allowed
* @sock: sending socket
* @msg: message to send
* @size: size of message
*
* Check permission before transmitting a message to another socket.
*
* Return: Returns 0 if permission is granted.
*/
int security_socket_sendmsg(struct socket *sock, struct msghdr *msg, int size)
{
return call_int_hook(socket_sendmsg, sock, msg, size);
}
/**
* security_socket_recvmsg() - Check if receiving a message is allowed
* @sock: receiving socket
* @msg: message to receive
* @size: size of message
* @flags: operational flags
*
* Check permission before receiving a message from a socket.
*
* Return: Returns 0 if permission is granted.
*/
int security_socket_recvmsg(struct socket *sock, struct msghdr *msg,
int size, int flags)
{
return call_int_hook(socket_recvmsg, sock, msg, size, flags);
}
/**
* security_socket_getsockname() - Check if reading the socket addr is allowed
* @sock: socket
*
* Check permission before reading the local address (name) of the socket
* object.
*
* Return: Returns 0 if permission is granted.
*/
int security_socket_getsockname(struct socket *sock)
{
return call_int_hook(socket_getsockname, sock);
}
/**
* security_socket_getpeername() - Check if reading the peer's addr is allowed
* @sock: socket
*
* Check permission before the remote address (name) of a socket object.
*
* Return: Returns 0 if permission is granted.
*/
int security_socket_getpeername(struct socket *sock)
{
return call_int_hook(socket_getpeername, sock);
}
/**
* security_socket_getsockopt() - Check if reading a socket option is allowed
* @sock: socket
* @level: option's protocol level
* @optname: option name
*
* Check permissions before retrieving the options associated with socket
* @sock.
*
* Return: Returns 0 if permission is granted.
*/
int security_socket_getsockopt(struct socket *sock, int level, int optname)
{
return call_int_hook(socket_getsockopt, sock, level, optname);
}
/**
* security_socket_setsockopt() - Check if setting a socket option is allowed
* @sock: socket
* @level: option's protocol level
* @optname: option name
*
* Check permissions before setting the options associated with socket @sock.
*
* Return: Returns 0 if permission is granted.
*/
int security_socket_setsockopt(struct socket *sock, int level, int optname)
{
return call_int_hook(socket_setsockopt, sock, level, optname);
}
/**
* security_socket_shutdown() - Checks if shutting down the socket is allowed
* @sock: socket
* @how: flag indicating how sends and receives are handled
*
* Checks permission before all or part of a connection on the socket @sock is
* shut down.
*
* Return: Returns 0 if permission is granted.
*/
int security_socket_shutdown(struct socket *sock, int how)
{
return call_int_hook(socket_shutdown, sock, how);
}
/**
* security_sock_rcv_skb() - Check if an incoming network packet is allowed
* @sk: destination sock
* @skb: incoming packet
*
* Check permissions on incoming network packets. This hook is distinct from
* Netfilter's IP input hooks since it is the first time that the incoming
* sk_buff @skb has been associated with a particular socket, @sk. Must not
* sleep inside this hook because some callers hold spinlocks.
*
* Return: Returns 0 if permission is granted.
*/
int security_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
return call_int_hook(socket_sock_rcv_skb, sk, skb);
}
EXPORT_SYMBOL(security_sock_rcv_skb);
/**
* security_socket_getpeersec_stream() - Get the remote peer label
* @sock: socket
* @optval: destination buffer
* @optlen: size of peer label copied into the buffer
* @len: maximum size of the destination buffer
*
* This hook allows the security module to provide peer socket security state
* for unix or connected tcp sockets to userspace via getsockopt SO_GETPEERSEC.
* For tcp sockets this can be meaningful if the socket is associated with an
* ipsec SA.
*
* Return: Returns 0 if all is well, otherwise, typical getsockopt return
* values.
*/
int security_socket_getpeersec_stream(struct socket *sock, sockptr_t optval,
sockptr_t optlen, unsigned int len)
{
return call_int_hook(socket_getpeersec_stream, sock, optval, optlen,
len);
}
/**
* security_socket_getpeersec_dgram() - Get the remote peer label
* @sock: socket
* @skb: datagram packet
* @secid: remote peer label secid
*
* This hook allows the security module to provide peer socket security state
* for udp sockets on a per-packet basis to userspace via getsockopt
* SO_GETPEERSEC. The application must first have indicated the IP_PASSSEC
* option via getsockopt. It can then retrieve the security state returned by
* this hook for a packet via the SCM_SECURITY ancillary message type.
*
* Return: Returns 0 on success, error on failure.
*/
int security_socket_getpeersec_dgram(struct socket *sock,
struct sk_buff *skb, u32 *secid)
{
return call_int_hook(socket_getpeersec_dgram, sock, skb, secid);
}
EXPORT_SYMBOL(security_socket_getpeersec_dgram);
/**
* lsm_sock_alloc - allocate a composite sock blob
* @sock: the sock that needs a blob
* @gfp: allocation mode
*
* Allocate the sock blob for all the modules
*
* Returns 0, or -ENOMEM if memory can't be allocated.
*/
static int lsm_sock_alloc(struct sock *sock, gfp_t gfp)
{
return lsm_blob_alloc(&sock->sk_security, blob_sizes.lbs_sock, gfp);
}
/**
* security_sk_alloc() - Allocate and initialize a sock's LSM blob
* @sk: sock
* @family: protocol family
* @priority: gfp flags
*
* Allocate and attach a security structure to the sk->sk_security field, which
* is used to copy security attributes between local stream sockets.
*
* Return: Returns 0 on success, error on failure.
*/
int security_sk_alloc(struct sock *sk, int family, gfp_t priority)
{
int rc = lsm_sock_alloc(sk, priority);
if (unlikely(rc))
return rc;
rc = call_int_hook(sk_alloc_security, sk, family, priority);
if (unlikely(rc))
security_sk_free(sk);
return rc;
}
/**
* security_sk_free() - Free the sock's LSM blob
* @sk: sock
*
* Deallocate security structure.
*/
void security_sk_free(struct sock *sk)
{
call_void_hook(sk_free_security, sk);
kfree(sk->sk_security);
sk->sk_security = NULL;
}
/**
* security_sk_clone() - Clone a sock's LSM state
* @sk: original sock
* @newsk: target sock
*
* Clone/copy security structure.
*/
void security_sk_clone(const struct sock *sk, struct sock *newsk)
{
call_void_hook(sk_clone_security, sk, newsk);
}
EXPORT_SYMBOL(security_sk_clone);
/**
* security_sk_classify_flow() - Set a flow's secid based on socket
* @sk: original socket
* @flic: target flow
*
* Set the target flow's secid to socket's secid.
*/
void security_sk_classify_flow(const struct sock *sk, struct flowi_common *flic)
{
call_void_hook(sk_getsecid, sk, &flic->flowic_secid);
}
EXPORT_SYMBOL(security_sk_classify_flow);
/**
* security_req_classify_flow() - Set a flow's secid based on request_sock
* @req: request_sock
* @flic: target flow
*
* Sets @flic's secid to @req's secid.
*/
void security_req_classify_flow(const struct request_sock *req,
struct flowi_common *flic)
{
call_void_hook(req_classify_flow, req, flic);
}
EXPORT_SYMBOL(security_req_classify_flow);
/**
* security_sock_graft() - Reconcile LSM state when grafting a sock on a socket
* @sk: sock being grafted
* @parent: target parent socket
*
* Sets @parent's inode secid to @sk's secid and update @sk with any necessary
* LSM state from @parent.
*/
void security_sock_graft(struct sock *sk, struct socket *parent)
{
call_void_hook(sock_graft, sk, parent);
}
EXPORT_SYMBOL(security_sock_graft);
/**
* security_inet_conn_request() - Set request_sock state using incoming connect
* @sk: parent listening sock
* @skb: incoming connection
* @req: new request_sock
*
* Initialize the @req LSM state based on @sk and the incoming connect in @skb.
*
* Return: Returns 0 if permission is granted.
*/
int security_inet_conn_request(const struct sock *sk,
struct sk_buff *skb, struct request_sock *req)
{
return call_int_hook(inet_conn_request, sk, skb, req);
}
EXPORT_SYMBOL(security_inet_conn_request);
/**
* security_inet_csk_clone() - Set new sock LSM state based on request_sock
* @newsk: new sock
* @req: connection request_sock
*
* Set that LSM state of @sock using the LSM state from @req.
*/
void security_inet_csk_clone(struct sock *newsk,
const struct request_sock *req)
{
call_void_hook(inet_csk_clone, newsk, req);
}
/**
* security_inet_conn_established() - Update sock's LSM state with connection
* @sk: sock
* @skb: connection packet
*
* Update @sock's LSM state to represent a new connection from @skb.
*/
void security_inet_conn_established(struct sock *sk,
struct sk_buff *skb)
{
call_void_hook(inet_conn_established, sk, skb);
}
EXPORT_SYMBOL(security_inet_conn_established);
/**
* security_secmark_relabel_packet() - Check if setting a secmark is allowed
* @secid: new secmark value
*
* Check if the process should be allowed to relabel packets to @secid.
*
* Return: Returns 0 if permission is granted.
*/
int security_secmark_relabel_packet(u32 secid)
{
return call_int_hook(secmark_relabel_packet, secid);
}
EXPORT_SYMBOL(security_secmark_relabel_packet);
/**
* security_secmark_refcount_inc() - Increment the secmark labeling rule count
*
* Tells the LSM to increment the number of secmark labeling rules loaded.
*/
void security_secmark_refcount_inc(void)
{
call_void_hook(secmark_refcount_inc);
}
EXPORT_SYMBOL(security_secmark_refcount_inc);
/**
* security_secmark_refcount_dec() - Decrement the secmark labeling rule count
*
* Tells the LSM to decrement the number of secmark labeling rules loaded.
*/
void security_secmark_refcount_dec(void)
{
call_void_hook(secmark_refcount_dec);
}
EXPORT_SYMBOL(security_secmark_refcount_dec);
/**
* security_tun_dev_alloc_security() - Allocate a LSM blob for a TUN device
* @security: pointer to the LSM blob
*
* This hook allows a module to allocate a security structure for a TUN device,
* returning the pointer in @security.
*
* Return: Returns a zero on success, negative values on failure.
*/
int security_tun_dev_alloc_security(void **security)
{
int rc;
rc = lsm_blob_alloc(security, blob_sizes.lbs_tun_dev, GFP_KERNEL);
if (rc)
return rc;
rc = call_int_hook(tun_dev_alloc_security, *security);
if (rc) {
kfree(*security);
*security = NULL;
}
return rc;
}
EXPORT_SYMBOL(security_tun_dev_alloc_security);
/**
* security_tun_dev_free_security() - Free a TUN device LSM blob
* @security: LSM blob
*
* This hook allows a module to free the security structure for a TUN device.
*/
void security_tun_dev_free_security(void *security)
{
kfree(security);
}
EXPORT_SYMBOL(security_tun_dev_free_security);
/**
* security_tun_dev_create() - Check if creating a TUN device is allowed
*
* Check permissions prior to creating a new TUN device.
*
* Return: Returns 0 if permission is granted.
*/
int security_tun_dev_create(void)
{
return call_int_hook(tun_dev_create);
}
EXPORT_SYMBOL(security_tun_dev_create);
/**
* security_tun_dev_attach_queue() - Check if attaching a TUN queue is allowed
* @security: TUN device LSM blob
*
* Check permissions prior to attaching to a TUN device queue.
*
* Return: Returns 0 if permission is granted.
*/
int security_tun_dev_attach_queue(void *security)
{
return call_int_hook(tun_dev_attach_queue, security);
}
EXPORT_SYMBOL(security_tun_dev_attach_queue);
/**
* security_tun_dev_attach() - Update TUN device LSM state on attach
* @sk: associated sock
* @security: TUN device LSM blob
*
* This hook can be used by the module to update any security state associated
* with the TUN device's sock structure.
*
* Return: Returns 0 if permission is granted.
*/
int security_tun_dev_attach(struct sock *sk, void *security)
{
return call_int_hook(tun_dev_attach, sk, security);
}
EXPORT_SYMBOL(security_tun_dev_attach);
/**
* security_tun_dev_open() - Update TUN device LSM state on open
* @security: TUN device LSM blob
*
* This hook can be used by the module to update any security state associated
* with the TUN device's security structure.
*
* Return: Returns 0 if permission is granted.
*/
int security_tun_dev_open(void *security)
{
return call_int_hook(tun_dev_open, security);
}
EXPORT_SYMBOL(security_tun_dev_open);
/**
* security_sctp_assoc_request() - Update the LSM on a SCTP association req
* @asoc: SCTP association
* @skb: packet requesting the association
*
* Passes the @asoc and @chunk->skb of the association INIT packet to the LSM.
*
* Return: Returns 0 on success, error on failure.
*/
int security_sctp_assoc_request(struct sctp_association *asoc,
struct sk_buff *skb)
{
return call_int_hook(sctp_assoc_request, asoc, skb);
}
EXPORT_SYMBOL(security_sctp_assoc_request);
/**
* security_sctp_bind_connect() - Validate a list of addrs for a SCTP option
* @sk: socket
* @optname: SCTP option to validate
* @address: list of IP addresses to validate
* @addrlen: length of the address list
*
* Validiate permissions required for each address associated with sock @sk.
* Depending on @optname, the addresses will be treated as either a connect or
* bind service. The @addrlen is calculated on each IPv4 and IPv6 address using
* sizeof(struct sockaddr_in) or sizeof(struct sockaddr_in6).
*
* Return: Returns 0 on success, error on failure.
*/
int security_sctp_bind_connect(struct sock *sk, int optname,
struct sockaddr *address, int addrlen)
{
return call_int_hook(sctp_bind_connect, sk, optname, address, addrlen);
}
EXPORT_SYMBOL(security_sctp_bind_connect);
/**
* security_sctp_sk_clone() - Clone a SCTP sock's LSM state
* @asoc: SCTP association
* @sk: original sock
* @newsk: target sock
*
* Called whenever a new socket is created by accept(2) (i.e. a TCP style
* socket) or when a socket is 'peeled off' e.g userspace calls
* sctp_peeloff(3).
*/
void security_sctp_sk_clone(struct sctp_association *asoc, struct sock *sk,
struct sock *newsk)
{
call_void_hook(sctp_sk_clone, asoc, sk, newsk);
}
EXPORT_SYMBOL(security_sctp_sk_clone);
/**
* security_sctp_assoc_established() - Update LSM state when assoc established
* @asoc: SCTP association
* @skb: packet establishing the association
*
* Passes the @asoc and @chunk->skb of the association COOKIE_ACK packet to the
* security module.
*
* Return: Returns 0 if permission is granted.
*/
int security_sctp_assoc_established(struct sctp_association *asoc,
struct sk_buff *skb)
{
return call_int_hook(sctp_assoc_established, asoc, skb);
}
EXPORT_SYMBOL(security_sctp_assoc_established);
/**
* security_mptcp_add_subflow() - Inherit the LSM label from the MPTCP socket
* @sk: the owning MPTCP socket
* @ssk: the new subflow
*
* Update the labeling for the given MPTCP subflow, to match the one of the
* owning MPTCP socket. This hook has to be called after the socket creation and
* initialization via the security_socket_create() and
* security_socket_post_create() LSM hooks.
*
* Return: Returns 0 on success or a negative error code on failure.
*/
int security_mptcp_add_subflow(struct sock *sk, struct sock *ssk)
{
return call_int_hook(mptcp_add_subflow, sk, ssk);
}
#endif /* CONFIG_SECURITY_NETWORK */
#ifdef CONFIG_SECURITY_INFINIBAND
/**
* security_ib_pkey_access() - Check if access to an IB pkey is allowed
* @sec: LSM blob
* @subnet_prefix: subnet prefix of the port
* @pkey: IB pkey
*
* Check permission to access a pkey when modifying a QP.
*
* Return: Returns 0 if permission is granted.
*/
int security_ib_pkey_access(void *sec, u64 subnet_prefix, u16 pkey)
{
return call_int_hook(ib_pkey_access, sec, subnet_prefix, pkey);
}
EXPORT_SYMBOL(security_ib_pkey_access);
/**
* security_ib_endport_manage_subnet() - Check if SMPs traffic is allowed
* @sec: LSM blob
* @dev_name: IB device name
* @port_num: port number
*
* Check permissions to send and receive SMPs on a end port.
*
* Return: Returns 0 if permission is granted.
*/
int security_ib_endport_manage_subnet(void *sec,
const char *dev_name, u8 port_num)
{
return call_int_hook(ib_endport_manage_subnet, sec, dev_name, port_num);
}
EXPORT_SYMBOL(security_ib_endport_manage_subnet);
/**
* security_ib_alloc_security() - Allocate an Infiniband LSM blob
* @sec: LSM blob
*
* Allocate a security structure for Infiniband objects.
*
* Return: Returns 0 on success, non-zero on failure.
*/
int security_ib_alloc_security(void **sec)
{
int rc;
rc = lsm_blob_alloc(sec, blob_sizes.lbs_ib, GFP_KERNEL);
if (rc)
return rc;
rc = call_int_hook(ib_alloc_security, *sec);
if (rc) {
kfree(*sec);
*sec = NULL;
}
return rc;
}
EXPORT_SYMBOL(security_ib_alloc_security);
/**
* security_ib_free_security() - Free an Infiniband LSM blob
* @sec: LSM blob
*
* Deallocate an Infiniband security structure.
*/
void security_ib_free_security(void *sec)
{
kfree(sec);
}
EXPORT_SYMBOL(security_ib_free_security);
#endif /* CONFIG_SECURITY_INFINIBAND */
#ifdef CONFIG_SECURITY_NETWORK_XFRM
/**
* security_xfrm_policy_alloc() - Allocate a xfrm policy LSM blob
* @ctxp: xfrm security context being added to the SPD
* @sec_ctx: security label provided by userspace
* @gfp: gfp flags
*
* Allocate a security structure to the xp->security field; the security field
* is initialized to NULL when the xfrm_policy is allocated.
*
* Return: Return 0 if operation was successful.
*/
int security_xfrm_policy_alloc(struct xfrm_sec_ctx **ctxp,
struct xfrm_user_sec_ctx *sec_ctx,
gfp_t gfp)
{
return call_int_hook(xfrm_policy_alloc_security, ctxp, sec_ctx, gfp);
}
EXPORT_SYMBOL(security_xfrm_policy_alloc);
/**
* security_xfrm_policy_clone() - Clone xfrm policy LSM state
* @old_ctx: xfrm security context
* @new_ctxp: target xfrm security context
*
* Allocate a security structure in new_ctxp that contains the information from
* the old_ctx structure.
*
* Return: Return 0 if operation was successful.
*/
int security_xfrm_policy_clone(struct xfrm_sec_ctx *old_ctx,
struct xfrm_sec_ctx **new_ctxp)
{
return call_int_hook(xfrm_policy_clone_security, old_ctx, new_ctxp);
}
/**
* security_xfrm_policy_free() - Free a xfrm security context
* @ctx: xfrm security context
*
* Free LSM resources associated with @ctx.
*/
void security_xfrm_policy_free(struct xfrm_sec_ctx *ctx)
{
call_void_hook(xfrm_policy_free_security, ctx);
}
EXPORT_SYMBOL(security_xfrm_policy_free);
/**
* security_xfrm_policy_delete() - Check if deleting a xfrm policy is allowed
* @ctx: xfrm security context
*
* Authorize deletion of a SPD entry.
*
* Return: Returns 0 if permission is granted.
*/
int security_xfrm_policy_delete(struct xfrm_sec_ctx *ctx)
{
return call_int_hook(xfrm_policy_delete_security, ctx);
}
/**
* security_xfrm_state_alloc() - Allocate a xfrm state LSM blob
* @x: xfrm state being added to the SAD
* @sec_ctx: security label provided by userspace
*
* Allocate a security structure to the @x->security field; the security field
* is initialized to NULL when the xfrm_state is allocated. Set the context to
* correspond to @sec_ctx.
*
* Return: Return 0 if operation was successful.
*/
int security_xfrm_state_alloc(struct xfrm_state *x,
struct xfrm_user_sec_ctx *sec_ctx)
{
return call_int_hook(xfrm_state_alloc, x, sec_ctx);
}
EXPORT_SYMBOL(security_xfrm_state_alloc);
/**
* security_xfrm_state_alloc_acquire() - Allocate a xfrm state LSM blob
* @x: xfrm state being added to the SAD
* @polsec: associated policy's security context
* @secid: secid from the flow
*
* Allocate a security structure to the x->security field; the security field
* is initialized to NULL when the xfrm_state is allocated. Set the context to
* correspond to secid.
*
* Return: Returns 0 if operation was successful.
*/
int security_xfrm_state_alloc_acquire(struct xfrm_state *x,
struct xfrm_sec_ctx *polsec, u32 secid)
{
return call_int_hook(xfrm_state_alloc_acquire, x, polsec, secid);
}
/**
* security_xfrm_state_delete() - Check if deleting a xfrm state is allowed
* @x: xfrm state
*
* Authorize deletion of x->security.
*
* Return: Returns 0 if permission is granted.
*/
int security_xfrm_state_delete(struct xfrm_state *x)
{
return call_int_hook(xfrm_state_delete_security, x);
}
EXPORT_SYMBOL(security_xfrm_state_delete);
/**
* security_xfrm_state_free() - Free a xfrm state
* @x: xfrm state
*
* Deallocate x->security.
*/
void security_xfrm_state_free(struct xfrm_state *x)
{
call_void_hook(xfrm_state_free_security, x);
}
/**
* security_xfrm_policy_lookup() - Check if using a xfrm policy is allowed
* @ctx: target xfrm security context
* @fl_secid: flow secid used to authorize access
*
* Check permission when a flow selects a xfrm_policy for processing XFRMs on a
* packet. The hook is called when selecting either a per-socket policy or a
* generic xfrm policy.
*
* Return: Return 0 if permission is granted, -ESRCH otherwise, or -errno on
* other errors.
*/
int security_xfrm_policy_lookup(struct xfrm_sec_ctx *ctx, u32 fl_secid)
{
return call_int_hook(xfrm_policy_lookup, ctx, fl_secid);
}
/**
* security_xfrm_state_pol_flow_match() - Check for a xfrm match
* @x: xfrm state to match
* @xp: xfrm policy to check for a match
* @flic: flow to check for a match.
*
* Check @xp and @flic for a match with @x.
*
* Return: Returns 1 if there is a match.
*/
int security_xfrm_state_pol_flow_match(struct xfrm_state *x,
struct xfrm_policy *xp,
const struct flowi_common *flic)
{
struct lsm_static_call *scall;
int rc = LSM_RET_DEFAULT(xfrm_state_pol_flow_match);
/*
* Since this function is expected to return 0 or 1, the judgment
* becomes difficult if multiple LSMs supply this call. Fortunately,
* we can use the first LSM's judgment because currently only SELinux
* supplies this call.
*
* For speed optimization, we explicitly break the loop rather than
* using the macro
*/
lsm_for_each_hook(scall, xfrm_state_pol_flow_match) {
rc = scall->hl->hook.xfrm_state_pol_flow_match(x, xp, flic);
break;
}
return rc;
}
/**
* security_xfrm_decode_session() - Determine the xfrm secid for a packet
* @skb: xfrm packet
* @secid: secid
*
* Decode the packet in @skb and return the security label in @secid.
*
* Return: Return 0 if all xfrms used have the same secid.
*/
int security_xfrm_decode_session(struct sk_buff *skb, u32 *secid)
{
return call_int_hook(xfrm_decode_session, skb, secid, 1);
}
void security_skb_classify_flow(struct sk_buff *skb, struct flowi_common *flic)
{
int rc = call_int_hook(xfrm_decode_session, skb, &flic->flowic_secid,
0);
BUG_ON(rc);
}
EXPORT_SYMBOL(security_skb_classify_flow);
#endif /* CONFIG_SECURITY_NETWORK_XFRM */
#ifdef CONFIG_KEYS
/**
* security_key_alloc() - Allocate and initialize a kernel key LSM blob
* @key: key
* @cred: credentials
* @flags: allocation flags
*
* Permit allocation of a key and assign security data. Note that key does not
* have a serial number assigned at this point.
*
* Return: Return 0 if permission is granted, -ve error otherwise.
*/
int security_key_alloc(struct key *key, const struct cred *cred,
unsigned long flags)
{
int rc = lsm_key_alloc(key);
if (unlikely(rc))
return rc;
rc = call_int_hook(key_alloc, key, cred, flags);
if (unlikely(rc))
security_key_free(key);
return rc;
}
/**
* security_key_free() - Free a kernel key LSM blob
* @key: key
*
* Notification of destruction; free security data.
*/
void security_key_free(struct key *key)
{
kfree(key->security);
key->security = NULL;
}
/**
* security_key_permission() - Check if a kernel key operation is allowed
* @key_ref: key reference
* @cred: credentials of actor requesting access
* @need_perm: requested permissions
*
* See whether a specific operational right is granted to a process on a key.
*
* Return: Return 0 if permission is granted, -ve error otherwise.
*/
int security_key_permission(key_ref_t key_ref, const struct cred *cred,
enum key_need_perm need_perm)
{
return call_int_hook(key_permission, key_ref, cred, need_perm);
}
/**
* security_key_getsecurity() - Get the key's security label
* @key: key
* @buffer: security label buffer
*
* Get a textual representation of the security context attached to a key for
* the purposes of honouring KEYCTL_GETSECURITY. This function allocates the
* storage for the NUL-terminated string and the caller should free it.
*
* Return: Returns the length of @buffer (including terminating NUL) or -ve if
* an error occurs. May also return 0 (and a NULL buffer pointer) if
* there is no security label assigned to the key.
*/
int security_key_getsecurity(struct key *key, char **buffer)
{
*buffer = NULL;
return call_int_hook(key_getsecurity, key, buffer);
}
/**
* security_key_post_create_or_update() - Notification of key create or update
* @keyring: keyring to which the key is linked to
* @key: created or updated key
* @payload: data used to instantiate or update the key
* @payload_len: length of payload
* @flags: key flags
* @create: flag indicating whether the key was created or updated
*
* Notify the caller of a key creation or update.
*/
void security_key_post_create_or_update(struct key *keyring, struct key *key,
const void *payload, size_t payload_len,
unsigned long flags, bool create)
{
call_void_hook(key_post_create_or_update, keyring, key, payload,
payload_len, flags, create);
}
#endif /* CONFIG_KEYS */
#ifdef CONFIG_AUDIT
/**
* security_audit_rule_init() - Allocate and init an LSM audit rule struct
* @field: audit action
* @op: rule operator
* @rulestr: rule context
* @lsmrule: receive buffer for audit rule struct
* @gfp: GFP flag used for kmalloc
*
* Allocate and initialize an LSM audit rule structure.
*
* Return: Return 0 if @lsmrule has been successfully set, -EINVAL in case of
* an invalid rule.
*/
int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule,
gfp_t gfp)
{
return call_int_hook(audit_rule_init, field, op, rulestr, lsmrule, gfp);
}
/**
* security_audit_rule_known() - Check if an audit rule contains LSM fields
* @krule: audit rule
*
* Specifies whether given @krule contains any fields related to the current
* LSM.
*
* Return: Returns 1 in case of relation found, 0 otherwise.
*/
int security_audit_rule_known(struct audit_krule *krule)
{
return call_int_hook(audit_rule_known, krule);
}
/**
* security_audit_rule_free() - Free an LSM audit rule struct
* @lsmrule: audit rule struct
*
* Deallocate the LSM audit rule structure previously allocated by
* audit_rule_init().
*/
void security_audit_rule_free(void *lsmrule)
{
call_void_hook(audit_rule_free, lsmrule);
}
/**
* security_audit_rule_match() - Check if a label matches an audit rule
* @secid: security label
* @field: LSM audit field
* @op: matching operator
* @lsmrule: audit rule
*
* Determine if given @secid matches a rule previously approved by
* security_audit_rule_known().
*
* Return: Returns 1 if secid matches the rule, 0 if it does not, -ERRNO on
* failure.
*/
int security_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule)
{
return call_int_hook(audit_rule_match, secid, field, op, lsmrule);
}
#endif /* CONFIG_AUDIT */
#ifdef CONFIG_BPF_SYSCALL
/**
* security_bpf() - Check if the bpf syscall operation is allowed
* @cmd: command
* @attr: bpf attribute
* @size: size
*
* Do a initial check for all bpf syscalls after the attribute is copied into
* the kernel. The actual security module can implement their own rules to
* check the specific cmd they need.
*
* Return: Returns 0 if permission is granted.
*/
int security_bpf(int cmd, union bpf_attr *attr, unsigned int size)
{
return call_int_hook(bpf, cmd, attr, size);
}
/**
* security_bpf_map() - Check if access to a bpf map is allowed
* @map: bpf map
* @fmode: mode
*
* Do a check when the kernel generates and returns a file descriptor for eBPF
* maps.
*
* Return: Returns 0 if permission is granted.
*/
int security_bpf_map(struct bpf_map *map, fmode_t fmode)
{
return call_int_hook(bpf_map, map, fmode);
}
/**
* security_bpf_prog() - Check if access to a bpf program is allowed
* @prog: bpf program
*
* Do a check when the kernel generates and returns a file descriptor for eBPF
* programs.
*
* Return: Returns 0 if permission is granted.
*/
int security_bpf_prog(struct bpf_prog *prog)
{
return call_int_hook(bpf_prog, prog);
}
/**
* security_bpf_map_create() - Check if BPF map creation is allowed
* @map: BPF map object
* @attr: BPF syscall attributes used to create BPF map
* @token: BPF token used to grant user access
*
* Do a check when the kernel creates a new BPF map. This is also the
* point where LSM blob is allocated for LSMs that need them.
*
* Return: Returns 0 on success, error on failure.
*/
int security_bpf_map_create(struct bpf_map *map, union bpf_attr *attr,
struct bpf_token *token)
{
return call_int_hook(bpf_map_create, map, attr, token);
}
/**
* security_bpf_prog_load() - Check if loading of BPF program is allowed
* @prog: BPF program object
* @attr: BPF syscall attributes used to create BPF program
* @token: BPF token used to grant user access to BPF subsystem
*
* Perform an access control check when the kernel loads a BPF program and
* allocates associated BPF program object. This hook is also responsible for
* allocating any required LSM state for the BPF program.
*
* Return: Returns 0 on success, error on failure.
*/
int security_bpf_prog_load(struct bpf_prog *prog, union bpf_attr *attr,
struct bpf_token *token)
{
return call_int_hook(bpf_prog_load, prog, attr, token);
}
/**
* security_bpf_token_create() - Check if creating of BPF token is allowed
* @token: BPF token object
* @attr: BPF syscall attributes used to create BPF token
* @path: path pointing to BPF FS mount point from which BPF token is created
*
* Do a check when the kernel instantiates a new BPF token object from BPF FS
* instance. This is also the point where LSM blob can be allocated for LSMs.
*
* Return: Returns 0 on success, error on failure.
*/
int security_bpf_token_create(struct bpf_token *token, union bpf_attr *attr,
const struct path *path)
{
return call_int_hook(bpf_token_create, token, attr, path);
}
/**
* security_bpf_token_cmd() - Check if BPF token is allowed to delegate
* requested BPF syscall command
* @token: BPF token object
* @cmd: BPF syscall command requested to be delegated by BPF token
*
* Do a check when the kernel decides whether provided BPF token should allow
* delegation of requested BPF syscall command.
*
* Return: Returns 0 on success, error on failure.
*/
int security_bpf_token_cmd(const struct bpf_token *token, enum bpf_cmd cmd)
{
return call_int_hook(bpf_token_cmd, token, cmd);
}
/**
* security_bpf_token_capable() - Check if BPF token is allowed to delegate
* requested BPF-related capability
* @token: BPF token object
* @cap: capabilities requested to be delegated by BPF token
*
* Do a check when the kernel decides whether provided BPF token should allow
* delegation of requested BPF-related capabilities.
*
* Return: Returns 0 on success, error on failure.
*/
int security_bpf_token_capable(const struct bpf_token *token, int cap)
{
return call_int_hook(bpf_token_capable, token, cap);
}
/**
* security_bpf_map_free() - Free a bpf map's LSM blob
* @map: bpf map
*
* Clean up the security information stored inside bpf map.
*/
void security_bpf_map_free(struct bpf_map *map)
{
call_void_hook(bpf_map_free, map);
}
/**
* security_bpf_prog_free() - Free a BPF program's LSM blob
* @prog: BPF program struct
*
* Clean up the security information stored inside BPF program.
*/
void security_bpf_prog_free(struct bpf_prog *prog)
{
call_void_hook(bpf_prog_free, prog);
}
/**
* security_bpf_token_free() - Free a BPF token's LSM blob
* @token: BPF token struct
*
* Clean up the security information stored inside BPF token.
*/
void security_bpf_token_free(struct bpf_token *token)
{
call_void_hook(bpf_token_free, token);
}
#endif /* CONFIG_BPF_SYSCALL */
/**
* security_locked_down() - Check if a kernel feature is allowed
* @what: requested kernel feature
*
* Determine whether a kernel feature that potentially enables arbitrary code
* execution in kernel space should be permitted.
*
* Return: Returns 0 if permission is granted.
*/
int security_locked_down(enum lockdown_reason what)
{
return call_int_hook(locked_down, what);
}
EXPORT_SYMBOL(security_locked_down);
/**
* security_bdev_alloc() - Allocate a block device LSM blob
* @bdev: block device
*
* Allocate and attach a security structure to @bdev->bd_security. The
* security field is initialized to NULL when the bdev structure is
* allocated.
*
* Return: Return 0 if operation was successful.
*/
int security_bdev_alloc(struct block_device *bdev)
{
int rc = 0;
rc = lsm_bdev_alloc(bdev);
if (unlikely(rc))
return rc;
rc = call_int_hook(bdev_alloc_security, bdev);
if (unlikely(rc))
security_bdev_free(bdev);
return rc;
}
EXPORT_SYMBOL(security_bdev_alloc);
/**
* security_bdev_free() - Free a block device's LSM blob
* @bdev: block device
*
* Deallocate the bdev security structure and set @bdev->bd_security to NULL.
*/
void security_bdev_free(struct block_device *bdev)
{
if (!bdev->bd_security)
return;
call_void_hook(bdev_free_security, bdev);
kfree(bdev->bd_security);
bdev->bd_security = NULL;
}
EXPORT_SYMBOL(security_bdev_free);
/**
* security_bdev_setintegrity() - Set the device's integrity data
* @bdev: block device
* @type: type of integrity, e.g. hash digest, signature, etc
* @value: the integrity value
* @size: size of the integrity value
*
* Register a verified integrity measurement of a bdev with LSMs.
* LSMs should free the previously saved data if @value is NULL.
* Please note that the new hook should be invoked every time the security
* information is updated to keep these data current. For example, in dm-verity,
* if the mapping table is reloaded and configured to use a different dm-verity
* target with a new roothash and signing information, the previously stored
* data in the LSM blob will become obsolete. It is crucial to re-invoke the
* hook to refresh these data and ensure they are up to date. This necessity
* arises from the design of device-mapper, where a device-mapper device is
* first created, and then targets are subsequently loaded into it. These
* targets can be modified multiple times during the device's lifetime.
* Therefore, while the LSM blob is allocated during the creation of the block
* device, its actual contents are not initialized at this stage and can change
* substantially over time. This includes alterations from data that the LSMs
* 'trusts' to those they do not, making it essential to handle these changes
* correctly. Failure to address this dynamic aspect could potentially allow
* for bypassing LSM checks.
*
* Return: Returns 0 on success, negative values on failure.
*/
int security_bdev_setintegrity(struct block_device *bdev,
enum lsm_integrity_type type, const void *value,
size_t size)
{
return call_int_hook(bdev_setintegrity, bdev, type, value, size);
}
EXPORT_SYMBOL(security_bdev_setintegrity);
#ifdef CONFIG_PERF_EVENTS
/**
* security_perf_event_open() - Check if a perf event open is allowed
* @attr: perf event attribute
* @type: type of event
*
* Check whether the @type of perf_event_open syscall is allowed.
*
* Return: Returns 0 if permission is granted.
*/
int security_perf_event_open(struct perf_event_attr *attr, int type)
{
return call_int_hook(perf_event_open, attr, type);
}
/**
* security_perf_event_alloc() - Allocate a perf event LSM blob
* @event: perf event
*
* Allocate and save perf_event security info.
*
* Return: Returns 0 on success, error on failure.
*/
int security_perf_event_alloc(struct perf_event *event)
{
int rc;
rc = lsm_blob_alloc(&event->security, blob_sizes.lbs_perf_event,
GFP_KERNEL);
if (rc)
return rc;
rc = call_int_hook(perf_event_alloc, event);
if (rc) {
kfree(event->security);
event->security = NULL;
}
return rc;
}
/**
* security_perf_event_free() - Free a perf event LSM blob
* @event: perf event
*
* Release (free) perf_event security info.
*/
void security_perf_event_free(struct perf_event *event)
{
kfree(event->security);
event->security = NULL;
}
/**
* security_perf_event_read() - Check if reading a perf event label is allowed
* @event: perf event
*
* Read perf_event security info if allowed.
*
* Return: Returns 0 if permission is granted.
*/
int security_perf_event_read(struct perf_event *event)
{
return call_int_hook(perf_event_read, event);
}
/**
* security_perf_event_write() - Check if writing a perf event label is allowed
* @event: perf event
*
* Write perf_event security info if allowed.
*
* Return: Returns 0 if permission is granted.
*/
int security_perf_event_write(struct perf_event *event)
{
return call_int_hook(perf_event_write, event);
}
#endif /* CONFIG_PERF_EVENTS */
#ifdef CONFIG_IO_URING
/**
* security_uring_override_creds() - Check if overriding creds is allowed
* @new: new credentials
*
* Check if the current task, executing an io_uring operation, is allowed to
* override it's credentials with @new.
*
* Return: Returns 0 if permission is granted.
*/
int security_uring_override_creds(const struct cred *new)
{
return call_int_hook(uring_override_creds, new);
}
/**
* security_uring_sqpoll() - Check if IORING_SETUP_SQPOLL is allowed
*
* Check whether the current task is allowed to spawn a io_uring polling thread
* (IORING_SETUP_SQPOLL).
*
* Return: Returns 0 if permission is granted.
*/
int security_uring_sqpoll(void)
{
return call_int_hook(uring_sqpoll);
}
/**
* security_uring_cmd() - Check if a io_uring passthrough command is allowed
* @ioucmd: command
*
* Check whether the file_operations uring_cmd is allowed to run.
*
* Return: Returns 0 if permission is granted.
*/
int security_uring_cmd(struct io_uring_cmd *ioucmd)
{
return call_int_hook(uring_cmd, ioucmd);
}
#endif /* CONFIG_IO_URING */
/**
* security_initramfs_populated() - Notify LSMs that initramfs has been loaded
*
* Tells the LSMs the initramfs has been unpacked into the rootfs.
*/
void security_initramfs_populated(void)
{
call_void_hook(initramfs_populated);
}