mirror of
https://github.com/torvalds/linux.git
synced 2024-12-11 21:52:04 +00:00
e499214ce3
All codepaths that don't want to implement POSIX ACLs should simply not implement the associated inode operations instead of relying on IOP_XATTR. That's the case for all filesystems today. For vfs_listxattr() all filesystems that explicitly turn of xattrs for a given inode all set inode->i_op to a dedicated set of inode operations that doesn't implement ->listxattr(). We can remove the dependency of vfs_listxattr() on IOP_XATTR. Removing this dependency will allow us to decouple POSIX ACLs from IOP_XATTR and they can still be listed even if no other xattr handlers are implemented. Otherwise we would have to implement elaborate schemes to raise IOP_XATTR even if sb->s_xattr is set to NULL. Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
1300 lines
31 KiB
C
1300 lines
31 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (C) 2002,2003 by Andreas Gruenbacher <a.gruenbacher@computer.org>
|
|
*
|
|
* Fixes from William Schumacher incorporated on 15 March 2001.
|
|
* (Reported by Charles Bertsch, <CBertsch@microtest.com>).
|
|
*/
|
|
|
|
/*
|
|
* This file contains generic functions for manipulating
|
|
* POSIX 1003.1e draft standard 17 ACLs.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/atomic.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/cred.h>
|
|
#include <linux/posix_acl.h>
|
|
#include <linux/posix_acl_xattr.h>
|
|
#include <linux/xattr.h>
|
|
#include <linux/export.h>
|
|
#include <linux/user_namespace.h>
|
|
#include <linux/namei.h>
|
|
#include <linux/mnt_idmapping.h>
|
|
#include <linux/iversion.h>
|
|
#include <linux/security.h>
|
|
#include <linux/evm.h>
|
|
#include <linux/fsnotify.h>
|
|
#include <linux/filelock.h>
|
|
|
|
#include "internal.h"
|
|
|
|
static struct posix_acl **acl_by_type(struct inode *inode, int type)
|
|
{
|
|
switch (type) {
|
|
case ACL_TYPE_ACCESS:
|
|
return &inode->i_acl;
|
|
case ACL_TYPE_DEFAULT:
|
|
return &inode->i_default_acl;
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
struct posix_acl *get_cached_acl(struct inode *inode, int type)
|
|
{
|
|
struct posix_acl **p = acl_by_type(inode, type);
|
|
struct posix_acl *acl;
|
|
|
|
for (;;) {
|
|
rcu_read_lock();
|
|
acl = rcu_dereference(*p);
|
|
if (!acl || is_uncached_acl(acl) ||
|
|
refcount_inc_not_zero(&acl->a_refcount))
|
|
break;
|
|
rcu_read_unlock();
|
|
cpu_relax();
|
|
}
|
|
rcu_read_unlock();
|
|
return acl;
|
|
}
|
|
EXPORT_SYMBOL(get_cached_acl);
|
|
|
|
struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type)
|
|
{
|
|
struct posix_acl *acl = rcu_dereference(*acl_by_type(inode, type));
|
|
|
|
if (acl == ACL_DONT_CACHE) {
|
|
struct posix_acl *ret;
|
|
|
|
ret = inode->i_op->get_inode_acl(inode, type, LOOKUP_RCU);
|
|
if (!IS_ERR(ret))
|
|
acl = ret;
|
|
}
|
|
|
|
return acl;
|
|
}
|
|
EXPORT_SYMBOL(get_cached_acl_rcu);
|
|
|
|
void set_cached_acl(struct inode *inode, int type, struct posix_acl *acl)
|
|
{
|
|
struct posix_acl **p = acl_by_type(inode, type);
|
|
struct posix_acl *old;
|
|
|
|
old = xchg(p, posix_acl_dup(acl));
|
|
if (!is_uncached_acl(old))
|
|
posix_acl_release(old);
|
|
}
|
|
EXPORT_SYMBOL(set_cached_acl);
|
|
|
|
static void __forget_cached_acl(struct posix_acl **p)
|
|
{
|
|
struct posix_acl *old;
|
|
|
|
old = xchg(p, ACL_NOT_CACHED);
|
|
if (!is_uncached_acl(old))
|
|
posix_acl_release(old);
|
|
}
|
|
|
|
void forget_cached_acl(struct inode *inode, int type)
|
|
{
|
|
__forget_cached_acl(acl_by_type(inode, type));
|
|
}
|
|
EXPORT_SYMBOL(forget_cached_acl);
|
|
|
|
void forget_all_cached_acls(struct inode *inode)
|
|
{
|
|
__forget_cached_acl(&inode->i_acl);
|
|
__forget_cached_acl(&inode->i_default_acl);
|
|
}
|
|
EXPORT_SYMBOL(forget_all_cached_acls);
|
|
|
|
static struct posix_acl *__get_acl(struct mnt_idmap *idmap,
|
|
struct dentry *dentry, struct inode *inode,
|
|
int type)
|
|
{
|
|
struct posix_acl *sentinel;
|
|
struct posix_acl **p;
|
|
struct posix_acl *acl;
|
|
|
|
/*
|
|
* The sentinel is used to detect when another operation like
|
|
* set_cached_acl() or forget_cached_acl() races with get_inode_acl().
|
|
* It is guaranteed that is_uncached_acl(sentinel) is true.
|
|
*/
|
|
|
|
acl = get_cached_acl(inode, type);
|
|
if (!is_uncached_acl(acl))
|
|
return acl;
|
|
|
|
if (!IS_POSIXACL(inode))
|
|
return NULL;
|
|
|
|
sentinel = uncached_acl_sentinel(current);
|
|
p = acl_by_type(inode, type);
|
|
|
|
/*
|
|
* If the ACL isn't being read yet, set our sentinel. Otherwise, the
|
|
* current value of the ACL will not be ACL_NOT_CACHED and so our own
|
|
* sentinel will not be set; another task will update the cache. We
|
|
* could wait for that other task to complete its job, but it's easier
|
|
* to just call ->get_inode_acl to fetch the ACL ourself. (This is
|
|
* going to be an unlikely race.)
|
|
*/
|
|
cmpxchg(p, ACL_NOT_CACHED, sentinel);
|
|
|
|
/*
|
|
* Normally, the ACL returned by ->get{_inode}_acl will be cached.
|
|
* A filesystem can prevent that by calling
|
|
* forget_cached_acl(inode, type) in ->get{_inode}_acl.
|
|
*
|
|
* If the filesystem doesn't have a get{_inode}_ acl() function at all,
|
|
* we'll just create the negative cache entry.
|
|
*/
|
|
if (dentry && inode->i_op->get_acl) {
|
|
acl = inode->i_op->get_acl(idmap, dentry, type);
|
|
} else if (inode->i_op->get_inode_acl) {
|
|
acl = inode->i_op->get_inode_acl(inode, type, false);
|
|
} else {
|
|
set_cached_acl(inode, type, NULL);
|
|
return NULL;
|
|
}
|
|
if (IS_ERR(acl)) {
|
|
/*
|
|
* Remove our sentinel so that we don't block future attempts
|
|
* to cache the ACL.
|
|
*/
|
|
cmpxchg(p, sentinel, ACL_NOT_CACHED);
|
|
return acl;
|
|
}
|
|
|
|
/*
|
|
* Cache the result, but only if our sentinel is still in place.
|
|
*/
|
|
posix_acl_dup(acl);
|
|
if (unlikely(!try_cmpxchg(p, &sentinel, acl)))
|
|
posix_acl_release(acl);
|
|
return acl;
|
|
}
|
|
|
|
struct posix_acl *get_inode_acl(struct inode *inode, int type)
|
|
{
|
|
return __get_acl(&nop_mnt_idmap, NULL, inode, type);
|
|
}
|
|
EXPORT_SYMBOL(get_inode_acl);
|
|
|
|
/*
|
|
* Init a fresh posix_acl
|
|
*/
|
|
void
|
|
posix_acl_init(struct posix_acl *acl, int count)
|
|
{
|
|
refcount_set(&acl->a_refcount, 1);
|
|
acl->a_count = count;
|
|
}
|
|
EXPORT_SYMBOL(posix_acl_init);
|
|
|
|
/*
|
|
* Allocate a new ACL with the specified number of entries.
|
|
*/
|
|
struct posix_acl *
|
|
posix_acl_alloc(int count, gfp_t flags)
|
|
{
|
|
const size_t size = sizeof(struct posix_acl) +
|
|
count * sizeof(struct posix_acl_entry);
|
|
struct posix_acl *acl = kmalloc(size, flags);
|
|
if (acl)
|
|
posix_acl_init(acl, count);
|
|
return acl;
|
|
}
|
|
EXPORT_SYMBOL(posix_acl_alloc);
|
|
|
|
/*
|
|
* Clone an ACL.
|
|
*/
|
|
struct posix_acl *
|
|
posix_acl_clone(const struct posix_acl *acl, gfp_t flags)
|
|
{
|
|
struct posix_acl *clone = NULL;
|
|
|
|
if (acl) {
|
|
int size = sizeof(struct posix_acl) + acl->a_count *
|
|
sizeof(struct posix_acl_entry);
|
|
clone = kmemdup(acl, size, flags);
|
|
if (clone)
|
|
refcount_set(&clone->a_refcount, 1);
|
|
}
|
|
return clone;
|
|
}
|
|
EXPORT_SYMBOL_GPL(posix_acl_clone);
|
|
|
|
/*
|
|
* Check if an acl is valid. Returns 0 if it is, or -E... otherwise.
|
|
*/
|
|
int
|
|
posix_acl_valid(struct user_namespace *user_ns, const struct posix_acl *acl)
|
|
{
|
|
const struct posix_acl_entry *pa, *pe;
|
|
int state = ACL_USER_OBJ;
|
|
int needs_mask = 0;
|
|
|
|
FOREACH_ACL_ENTRY(pa, acl, pe) {
|
|
if (pa->e_perm & ~(ACL_READ|ACL_WRITE|ACL_EXECUTE))
|
|
return -EINVAL;
|
|
switch (pa->e_tag) {
|
|
case ACL_USER_OBJ:
|
|
if (state == ACL_USER_OBJ) {
|
|
state = ACL_USER;
|
|
break;
|
|
}
|
|
return -EINVAL;
|
|
|
|
case ACL_USER:
|
|
if (state != ACL_USER)
|
|
return -EINVAL;
|
|
if (!kuid_has_mapping(user_ns, pa->e_uid))
|
|
return -EINVAL;
|
|
needs_mask = 1;
|
|
break;
|
|
|
|
case ACL_GROUP_OBJ:
|
|
if (state == ACL_USER) {
|
|
state = ACL_GROUP;
|
|
break;
|
|
}
|
|
return -EINVAL;
|
|
|
|
case ACL_GROUP:
|
|
if (state != ACL_GROUP)
|
|
return -EINVAL;
|
|
if (!kgid_has_mapping(user_ns, pa->e_gid))
|
|
return -EINVAL;
|
|
needs_mask = 1;
|
|
break;
|
|
|
|
case ACL_MASK:
|
|
if (state != ACL_GROUP)
|
|
return -EINVAL;
|
|
state = ACL_OTHER;
|
|
break;
|
|
|
|
case ACL_OTHER:
|
|
if (state == ACL_OTHER ||
|
|
(state == ACL_GROUP && !needs_mask)) {
|
|
state = 0;
|
|
break;
|
|
}
|
|
return -EINVAL;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
if (state == 0)
|
|
return 0;
|
|
return -EINVAL;
|
|
}
|
|
EXPORT_SYMBOL(posix_acl_valid);
|
|
|
|
/*
|
|
* Returns 0 if the acl can be exactly represented in the traditional
|
|
* file mode permission bits, or else 1. Returns -E... on error.
|
|
*/
|
|
int
|
|
posix_acl_equiv_mode(const struct posix_acl *acl, umode_t *mode_p)
|
|
{
|
|
const struct posix_acl_entry *pa, *pe;
|
|
umode_t mode = 0;
|
|
int not_equiv = 0;
|
|
|
|
/*
|
|
* A null ACL can always be presented as mode bits.
|
|
*/
|
|
if (!acl)
|
|
return 0;
|
|
|
|
FOREACH_ACL_ENTRY(pa, acl, pe) {
|
|
switch (pa->e_tag) {
|
|
case ACL_USER_OBJ:
|
|
mode |= (pa->e_perm & S_IRWXO) << 6;
|
|
break;
|
|
case ACL_GROUP_OBJ:
|
|
mode |= (pa->e_perm & S_IRWXO) << 3;
|
|
break;
|
|
case ACL_OTHER:
|
|
mode |= pa->e_perm & S_IRWXO;
|
|
break;
|
|
case ACL_MASK:
|
|
mode = (mode & ~S_IRWXG) |
|
|
((pa->e_perm & S_IRWXO) << 3);
|
|
not_equiv = 1;
|
|
break;
|
|
case ACL_USER:
|
|
case ACL_GROUP:
|
|
not_equiv = 1;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
if (mode_p)
|
|
*mode_p = (*mode_p & ~S_IRWXUGO) | mode;
|
|
return not_equiv;
|
|
}
|
|
EXPORT_SYMBOL(posix_acl_equiv_mode);
|
|
|
|
/*
|
|
* Create an ACL representing the file mode permission bits of an inode.
|
|
*/
|
|
struct posix_acl *
|
|
posix_acl_from_mode(umode_t mode, gfp_t flags)
|
|
{
|
|
struct posix_acl *acl = posix_acl_alloc(3, flags);
|
|
if (!acl)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
acl->a_entries[0].e_tag = ACL_USER_OBJ;
|
|
acl->a_entries[0].e_perm = (mode & S_IRWXU) >> 6;
|
|
|
|
acl->a_entries[1].e_tag = ACL_GROUP_OBJ;
|
|
acl->a_entries[1].e_perm = (mode & S_IRWXG) >> 3;
|
|
|
|
acl->a_entries[2].e_tag = ACL_OTHER;
|
|
acl->a_entries[2].e_perm = (mode & S_IRWXO);
|
|
return acl;
|
|
}
|
|
EXPORT_SYMBOL(posix_acl_from_mode);
|
|
|
|
/*
|
|
* Return 0 if current is granted want access to the inode
|
|
* by the acl. Returns -E... otherwise.
|
|
*/
|
|
int
|
|
posix_acl_permission(struct mnt_idmap *idmap, struct inode *inode,
|
|
const struct posix_acl *acl, int want)
|
|
{
|
|
const struct posix_acl_entry *pa, *pe, *mask_obj;
|
|
struct user_namespace *fs_userns = i_user_ns(inode);
|
|
int found = 0;
|
|
vfsuid_t vfsuid;
|
|
vfsgid_t vfsgid;
|
|
|
|
want &= MAY_READ | MAY_WRITE | MAY_EXEC;
|
|
|
|
FOREACH_ACL_ENTRY(pa, acl, pe) {
|
|
switch(pa->e_tag) {
|
|
case ACL_USER_OBJ:
|
|
/* (May have been checked already) */
|
|
vfsuid = i_uid_into_vfsuid(idmap, inode);
|
|
if (vfsuid_eq_kuid(vfsuid, current_fsuid()))
|
|
goto check_perm;
|
|
break;
|
|
case ACL_USER:
|
|
vfsuid = make_vfsuid(idmap, fs_userns,
|
|
pa->e_uid);
|
|
if (vfsuid_eq_kuid(vfsuid, current_fsuid()))
|
|
goto mask;
|
|
break;
|
|
case ACL_GROUP_OBJ:
|
|
vfsgid = i_gid_into_vfsgid(idmap, inode);
|
|
if (vfsgid_in_group_p(vfsgid)) {
|
|
found = 1;
|
|
if ((pa->e_perm & want) == want)
|
|
goto mask;
|
|
}
|
|
break;
|
|
case ACL_GROUP:
|
|
vfsgid = make_vfsgid(idmap, fs_userns,
|
|
pa->e_gid);
|
|
if (vfsgid_in_group_p(vfsgid)) {
|
|
found = 1;
|
|
if ((pa->e_perm & want) == want)
|
|
goto mask;
|
|
}
|
|
break;
|
|
case ACL_MASK:
|
|
break;
|
|
case ACL_OTHER:
|
|
if (found)
|
|
return -EACCES;
|
|
else
|
|
goto check_perm;
|
|
default:
|
|
return -EIO;
|
|
}
|
|
}
|
|
return -EIO;
|
|
|
|
mask:
|
|
for (mask_obj = pa+1; mask_obj != pe; mask_obj++) {
|
|
if (mask_obj->e_tag == ACL_MASK) {
|
|
if ((pa->e_perm & mask_obj->e_perm & want) == want)
|
|
return 0;
|
|
return -EACCES;
|
|
}
|
|
}
|
|
|
|
check_perm:
|
|
if ((pa->e_perm & want) == want)
|
|
return 0;
|
|
return -EACCES;
|
|
}
|
|
|
|
/*
|
|
* Modify acl when creating a new inode. The caller must ensure the acl is
|
|
* only referenced once.
|
|
*
|
|
* mode_p initially must contain the mode parameter to the open() / creat()
|
|
* system calls. All permissions that are not granted by the acl are removed.
|
|
* The permissions in the acl are changed to reflect the mode_p parameter.
|
|
*/
|
|
static int posix_acl_create_masq(struct posix_acl *acl, umode_t *mode_p)
|
|
{
|
|
struct posix_acl_entry *pa, *pe;
|
|
struct posix_acl_entry *group_obj = NULL, *mask_obj = NULL;
|
|
umode_t mode = *mode_p;
|
|
int not_equiv = 0;
|
|
|
|
/* assert(atomic_read(acl->a_refcount) == 1); */
|
|
|
|
FOREACH_ACL_ENTRY(pa, acl, pe) {
|
|
switch(pa->e_tag) {
|
|
case ACL_USER_OBJ:
|
|
pa->e_perm &= (mode >> 6) | ~S_IRWXO;
|
|
mode &= (pa->e_perm << 6) | ~S_IRWXU;
|
|
break;
|
|
|
|
case ACL_USER:
|
|
case ACL_GROUP:
|
|
not_equiv = 1;
|
|
break;
|
|
|
|
case ACL_GROUP_OBJ:
|
|
group_obj = pa;
|
|
break;
|
|
|
|
case ACL_OTHER:
|
|
pa->e_perm &= mode | ~S_IRWXO;
|
|
mode &= pa->e_perm | ~S_IRWXO;
|
|
break;
|
|
|
|
case ACL_MASK:
|
|
mask_obj = pa;
|
|
not_equiv = 1;
|
|
break;
|
|
|
|
default:
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
if (mask_obj) {
|
|
mask_obj->e_perm &= (mode >> 3) | ~S_IRWXO;
|
|
mode &= (mask_obj->e_perm << 3) | ~S_IRWXG;
|
|
} else {
|
|
if (!group_obj)
|
|
return -EIO;
|
|
group_obj->e_perm &= (mode >> 3) | ~S_IRWXO;
|
|
mode &= (group_obj->e_perm << 3) | ~S_IRWXG;
|
|
}
|
|
|
|
*mode_p = (*mode_p & ~S_IRWXUGO) | mode;
|
|
return not_equiv;
|
|
}
|
|
|
|
/*
|
|
* Modify the ACL for the chmod syscall.
|
|
*/
|
|
static int __posix_acl_chmod_masq(struct posix_acl *acl, umode_t mode)
|
|
{
|
|
struct posix_acl_entry *group_obj = NULL, *mask_obj = NULL;
|
|
struct posix_acl_entry *pa, *pe;
|
|
|
|
/* assert(atomic_read(acl->a_refcount) == 1); */
|
|
|
|
FOREACH_ACL_ENTRY(pa, acl, pe) {
|
|
switch(pa->e_tag) {
|
|
case ACL_USER_OBJ:
|
|
pa->e_perm = (mode & S_IRWXU) >> 6;
|
|
break;
|
|
|
|
case ACL_USER:
|
|
case ACL_GROUP:
|
|
break;
|
|
|
|
case ACL_GROUP_OBJ:
|
|
group_obj = pa;
|
|
break;
|
|
|
|
case ACL_MASK:
|
|
mask_obj = pa;
|
|
break;
|
|
|
|
case ACL_OTHER:
|
|
pa->e_perm = (mode & S_IRWXO);
|
|
break;
|
|
|
|
default:
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
if (mask_obj) {
|
|
mask_obj->e_perm = (mode & S_IRWXG) >> 3;
|
|
} else {
|
|
if (!group_obj)
|
|
return -EIO;
|
|
group_obj->e_perm = (mode & S_IRWXG) >> 3;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
__posix_acl_create(struct posix_acl **acl, gfp_t gfp, umode_t *mode_p)
|
|
{
|
|
struct posix_acl *clone = posix_acl_clone(*acl, gfp);
|
|
int err = -ENOMEM;
|
|
if (clone) {
|
|
err = posix_acl_create_masq(clone, mode_p);
|
|
if (err < 0) {
|
|
posix_acl_release(clone);
|
|
clone = NULL;
|
|
}
|
|
}
|
|
posix_acl_release(*acl);
|
|
*acl = clone;
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(__posix_acl_create);
|
|
|
|
int
|
|
__posix_acl_chmod(struct posix_acl **acl, gfp_t gfp, umode_t mode)
|
|
{
|
|
struct posix_acl *clone = posix_acl_clone(*acl, gfp);
|
|
int err = -ENOMEM;
|
|
if (clone) {
|
|
err = __posix_acl_chmod_masq(clone, mode);
|
|
if (err) {
|
|
posix_acl_release(clone);
|
|
clone = NULL;
|
|
}
|
|
}
|
|
posix_acl_release(*acl);
|
|
*acl = clone;
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(__posix_acl_chmod);
|
|
|
|
/**
|
|
* posix_acl_chmod - chmod a posix acl
|
|
*
|
|
* @idmap: idmap of the mount @inode was found from
|
|
* @dentry: dentry to check permissions on
|
|
* @mode: the new mode of @inode
|
|
*
|
|
* If the dentry has been found through an idmapped mount the idmap of
|
|
* the vfsmount must be passed through @idmap. This function will then
|
|
* take care to map the inode according to @idmap before checking
|
|
* permissions. On non-idmapped mounts or if permission checking is to be
|
|
* performed on the raw inode simply passs @nop_mnt_idmap.
|
|
*/
|
|
int
|
|
posix_acl_chmod(struct mnt_idmap *idmap, struct dentry *dentry,
|
|
umode_t mode)
|
|
{
|
|
struct inode *inode = d_inode(dentry);
|
|
struct posix_acl *acl;
|
|
int ret = 0;
|
|
|
|
if (!IS_POSIXACL(inode))
|
|
return 0;
|
|
if (!inode->i_op->set_acl)
|
|
return -EOPNOTSUPP;
|
|
|
|
acl = get_inode_acl(inode, ACL_TYPE_ACCESS);
|
|
if (IS_ERR_OR_NULL(acl)) {
|
|
if (acl == ERR_PTR(-EOPNOTSUPP))
|
|
return 0;
|
|
return PTR_ERR(acl);
|
|
}
|
|
|
|
ret = __posix_acl_chmod(&acl, GFP_KERNEL, mode);
|
|
if (ret)
|
|
return ret;
|
|
ret = inode->i_op->set_acl(idmap, dentry, acl, ACL_TYPE_ACCESS);
|
|
posix_acl_release(acl);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(posix_acl_chmod);
|
|
|
|
int
|
|
posix_acl_create(struct inode *dir, umode_t *mode,
|
|
struct posix_acl **default_acl, struct posix_acl **acl)
|
|
{
|
|
struct posix_acl *p;
|
|
struct posix_acl *clone;
|
|
int ret;
|
|
|
|
*acl = NULL;
|
|
*default_acl = NULL;
|
|
|
|
if (S_ISLNK(*mode) || !IS_POSIXACL(dir))
|
|
return 0;
|
|
|
|
p = get_inode_acl(dir, ACL_TYPE_DEFAULT);
|
|
if (!p || p == ERR_PTR(-EOPNOTSUPP)) {
|
|
*mode &= ~current_umask();
|
|
return 0;
|
|
}
|
|
if (IS_ERR(p))
|
|
return PTR_ERR(p);
|
|
|
|
ret = -ENOMEM;
|
|
clone = posix_acl_clone(p, GFP_NOFS);
|
|
if (!clone)
|
|
goto err_release;
|
|
|
|
ret = posix_acl_create_masq(clone, mode);
|
|
if (ret < 0)
|
|
goto err_release_clone;
|
|
|
|
if (ret == 0)
|
|
posix_acl_release(clone);
|
|
else
|
|
*acl = clone;
|
|
|
|
if (!S_ISDIR(*mode))
|
|
posix_acl_release(p);
|
|
else
|
|
*default_acl = p;
|
|
|
|
return 0;
|
|
|
|
err_release_clone:
|
|
posix_acl_release(clone);
|
|
err_release:
|
|
posix_acl_release(p);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(posix_acl_create);
|
|
|
|
/**
|
|
* posix_acl_update_mode - update mode in set_acl
|
|
* @idmap: idmap of the mount @inode was found from
|
|
* @inode: target inode
|
|
* @mode_p: mode (pointer) for update
|
|
* @acl: acl pointer
|
|
*
|
|
* Update the file mode when setting an ACL: compute the new file permission
|
|
* bits based on the ACL. In addition, if the ACL is equivalent to the new
|
|
* file mode, set *@acl to NULL to indicate that no ACL should be set.
|
|
*
|
|
* As with chmod, clear the setgid bit if the caller is not in the owning group
|
|
* or capable of CAP_FSETID (see inode_change_ok).
|
|
*
|
|
* If the inode has been found through an idmapped mount the idmap of
|
|
* the vfsmount must be passed through @idmap. This function will then
|
|
* take care to map the inode according to @idmap before checking
|
|
* permissions. On non-idmapped mounts or if permission checking is to be
|
|
* performed on the raw inode simply passs @nop_mnt_idmap.
|
|
*
|
|
* Called from set_acl inode operations.
|
|
*/
|
|
int posix_acl_update_mode(struct mnt_idmap *idmap,
|
|
struct inode *inode, umode_t *mode_p,
|
|
struct posix_acl **acl)
|
|
{
|
|
umode_t mode = inode->i_mode;
|
|
int error;
|
|
|
|
error = posix_acl_equiv_mode(*acl, &mode);
|
|
if (error < 0)
|
|
return error;
|
|
if (error == 0)
|
|
*acl = NULL;
|
|
if (!vfsgid_in_group_p(i_gid_into_vfsgid(idmap, inode)) &&
|
|
!capable_wrt_inode_uidgid(idmap, inode, CAP_FSETID))
|
|
mode &= ~S_ISGID;
|
|
*mode_p = mode;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(posix_acl_update_mode);
|
|
|
|
/*
|
|
* Fix up the uids and gids in posix acl extended attributes in place.
|
|
*/
|
|
static int posix_acl_fix_xattr_common(const void *value, size_t size)
|
|
{
|
|
const struct posix_acl_xattr_header *header = value;
|
|
int count;
|
|
|
|
if (!header)
|
|
return -EINVAL;
|
|
if (size < sizeof(struct posix_acl_xattr_header))
|
|
return -EINVAL;
|
|
if (header->a_version != cpu_to_le32(POSIX_ACL_XATTR_VERSION))
|
|
return -EOPNOTSUPP;
|
|
|
|
count = posix_acl_xattr_count(size);
|
|
if (count < 0)
|
|
return -EINVAL;
|
|
if (count == 0)
|
|
return 0;
|
|
|
|
return count;
|
|
}
|
|
|
|
/**
|
|
* posix_acl_from_xattr - convert POSIX ACLs from backing store to VFS format
|
|
* @userns: the filesystem's idmapping
|
|
* @value: the uapi representation of POSIX ACLs
|
|
* @size: the size of @void
|
|
*
|
|
* Filesystems that store POSIX ACLs in the unaltered uapi format should use
|
|
* posix_acl_from_xattr() when reading them from the backing store and
|
|
* converting them into the struct posix_acl VFS format. The helper is
|
|
* specifically intended to be called from the acl inode operation.
|
|
*
|
|
* The posix_acl_from_xattr() function will map the raw {g,u}id values stored
|
|
* in ACL_{GROUP,USER} entries into idmapping in @userns.
|
|
*
|
|
* Note that posix_acl_from_xattr() does not take idmapped mounts into account.
|
|
* If it did it calling it from the get acl inode operation would return POSIX
|
|
* ACLs mapped according to an idmapped mount which would mean that the value
|
|
* couldn't be cached for the filesystem. Idmapped mounts are taken into
|
|
* account on the fly during permission checking or right at the VFS -
|
|
* userspace boundary before reporting them to the user.
|
|
*
|
|
* Return: Allocated struct posix_acl on success, NULL for a valid header but
|
|
* without actual POSIX ACL entries, or ERR_PTR() encoded error code.
|
|
*/
|
|
struct posix_acl *posix_acl_from_xattr(struct user_namespace *userns,
|
|
const void *value, size_t size)
|
|
{
|
|
const struct posix_acl_xattr_header *header = value;
|
|
const struct posix_acl_xattr_entry *entry = (const void *)(header + 1), *end;
|
|
int count;
|
|
struct posix_acl *acl;
|
|
struct posix_acl_entry *acl_e;
|
|
|
|
count = posix_acl_fix_xattr_common(value, size);
|
|
if (count < 0)
|
|
return ERR_PTR(count);
|
|
if (count == 0)
|
|
return NULL;
|
|
|
|
acl = posix_acl_alloc(count, GFP_NOFS);
|
|
if (!acl)
|
|
return ERR_PTR(-ENOMEM);
|
|
acl_e = acl->a_entries;
|
|
|
|
for (end = entry + count; entry != end; acl_e++, entry++) {
|
|
acl_e->e_tag = le16_to_cpu(entry->e_tag);
|
|
acl_e->e_perm = le16_to_cpu(entry->e_perm);
|
|
|
|
switch(acl_e->e_tag) {
|
|
case ACL_USER_OBJ:
|
|
case ACL_GROUP_OBJ:
|
|
case ACL_MASK:
|
|
case ACL_OTHER:
|
|
break;
|
|
|
|
case ACL_USER:
|
|
acl_e->e_uid = make_kuid(userns,
|
|
le32_to_cpu(entry->e_id));
|
|
if (!uid_valid(acl_e->e_uid))
|
|
goto fail;
|
|
break;
|
|
case ACL_GROUP:
|
|
acl_e->e_gid = make_kgid(userns,
|
|
le32_to_cpu(entry->e_id));
|
|
if (!gid_valid(acl_e->e_gid))
|
|
goto fail;
|
|
break;
|
|
|
|
default:
|
|
goto fail;
|
|
}
|
|
}
|
|
return acl;
|
|
|
|
fail:
|
|
posix_acl_release(acl);
|
|
return ERR_PTR(-EINVAL);
|
|
}
|
|
EXPORT_SYMBOL (posix_acl_from_xattr);
|
|
|
|
/*
|
|
* Convert from in-memory to extended attribute representation.
|
|
*/
|
|
int
|
|
posix_acl_to_xattr(struct user_namespace *user_ns, const struct posix_acl *acl,
|
|
void *buffer, size_t size)
|
|
{
|
|
struct posix_acl_xattr_header *ext_acl = buffer;
|
|
struct posix_acl_xattr_entry *ext_entry;
|
|
int real_size, n;
|
|
|
|
real_size = posix_acl_xattr_size(acl->a_count);
|
|
if (!buffer)
|
|
return real_size;
|
|
if (real_size > size)
|
|
return -ERANGE;
|
|
|
|
ext_entry = (void *)(ext_acl + 1);
|
|
ext_acl->a_version = cpu_to_le32(POSIX_ACL_XATTR_VERSION);
|
|
|
|
for (n=0; n < acl->a_count; n++, ext_entry++) {
|
|
const struct posix_acl_entry *acl_e = &acl->a_entries[n];
|
|
ext_entry->e_tag = cpu_to_le16(acl_e->e_tag);
|
|
ext_entry->e_perm = cpu_to_le16(acl_e->e_perm);
|
|
switch(acl_e->e_tag) {
|
|
case ACL_USER:
|
|
ext_entry->e_id =
|
|
cpu_to_le32(from_kuid(user_ns, acl_e->e_uid));
|
|
break;
|
|
case ACL_GROUP:
|
|
ext_entry->e_id =
|
|
cpu_to_le32(from_kgid(user_ns, acl_e->e_gid));
|
|
break;
|
|
default:
|
|
ext_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
|
|
break;
|
|
}
|
|
}
|
|
return real_size;
|
|
}
|
|
EXPORT_SYMBOL (posix_acl_to_xattr);
|
|
|
|
/**
|
|
* vfs_posix_acl_to_xattr - convert from kernel to userspace representation
|
|
* @idmap: idmap of the mount
|
|
* @inode: inode the posix acls are set on
|
|
* @acl: the posix acls as represented by the vfs
|
|
* @buffer: the buffer into which to convert @acl
|
|
* @size: size of @buffer
|
|
*
|
|
* This converts @acl from the VFS representation in the filesystem idmapping
|
|
* to the uapi form reportable to userspace. And mount and caller idmappings
|
|
* are handled appropriately.
|
|
*
|
|
* Return: On success, the size of the stored uapi posix acls, on error a
|
|
* negative errno.
|
|
*/
|
|
static ssize_t vfs_posix_acl_to_xattr(struct mnt_idmap *idmap,
|
|
struct inode *inode,
|
|
const struct posix_acl *acl, void *buffer,
|
|
size_t size)
|
|
|
|
{
|
|
struct posix_acl_xattr_header *ext_acl = buffer;
|
|
struct posix_acl_xattr_entry *ext_entry;
|
|
struct user_namespace *fs_userns, *caller_userns;
|
|
ssize_t real_size, n;
|
|
vfsuid_t vfsuid;
|
|
vfsgid_t vfsgid;
|
|
|
|
real_size = posix_acl_xattr_size(acl->a_count);
|
|
if (!buffer)
|
|
return real_size;
|
|
if (real_size > size)
|
|
return -ERANGE;
|
|
|
|
ext_entry = (void *)(ext_acl + 1);
|
|
ext_acl->a_version = cpu_to_le32(POSIX_ACL_XATTR_VERSION);
|
|
|
|
fs_userns = i_user_ns(inode);
|
|
caller_userns = current_user_ns();
|
|
for (n=0; n < acl->a_count; n++, ext_entry++) {
|
|
const struct posix_acl_entry *acl_e = &acl->a_entries[n];
|
|
ext_entry->e_tag = cpu_to_le16(acl_e->e_tag);
|
|
ext_entry->e_perm = cpu_to_le16(acl_e->e_perm);
|
|
switch(acl_e->e_tag) {
|
|
case ACL_USER:
|
|
vfsuid = make_vfsuid(idmap, fs_userns, acl_e->e_uid);
|
|
ext_entry->e_id = cpu_to_le32(from_kuid(
|
|
caller_userns, vfsuid_into_kuid(vfsuid)));
|
|
break;
|
|
case ACL_GROUP:
|
|
vfsgid = make_vfsgid(idmap, fs_userns, acl_e->e_gid);
|
|
ext_entry->e_id = cpu_to_le32(from_kgid(
|
|
caller_userns, vfsgid_into_kgid(vfsgid)));
|
|
break;
|
|
default:
|
|
ext_entry->e_id = cpu_to_le32(ACL_UNDEFINED_ID);
|
|
break;
|
|
}
|
|
}
|
|
return real_size;
|
|
}
|
|
|
|
int
|
|
set_posix_acl(struct mnt_idmap *idmap, struct dentry *dentry,
|
|
int type, struct posix_acl *acl)
|
|
{
|
|
struct inode *inode = d_inode(dentry);
|
|
|
|
if (!IS_POSIXACL(inode))
|
|
return -EOPNOTSUPP;
|
|
if (!inode->i_op->set_acl)
|
|
return -EOPNOTSUPP;
|
|
|
|
if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode))
|
|
return acl ? -EACCES : 0;
|
|
if (!inode_owner_or_capable(idmap, inode))
|
|
return -EPERM;
|
|
|
|
if (acl) {
|
|
int ret = posix_acl_valid(inode->i_sb->s_user_ns, acl);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
return inode->i_op->set_acl(idmap, dentry, acl, type);
|
|
}
|
|
EXPORT_SYMBOL(set_posix_acl);
|
|
|
|
int posix_acl_listxattr(struct inode *inode, char **buffer,
|
|
ssize_t *remaining_size)
|
|
{
|
|
int err;
|
|
|
|
if (!IS_POSIXACL(inode))
|
|
return 0;
|
|
|
|
if (inode->i_acl) {
|
|
err = xattr_list_one(buffer, remaining_size,
|
|
XATTR_NAME_POSIX_ACL_ACCESS);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
if (inode->i_default_acl) {
|
|
err = xattr_list_one(buffer, remaining_size,
|
|
XATTR_NAME_POSIX_ACL_DEFAULT);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool
|
|
posix_acl_xattr_list(struct dentry *dentry)
|
|
{
|
|
return IS_POSIXACL(d_backing_inode(dentry));
|
|
}
|
|
|
|
/*
|
|
* nop_posix_acl_access - legacy xattr handler for access POSIX ACLs
|
|
*
|
|
* This is the legacy POSIX ACL access xattr handler. It is used by some
|
|
* filesystems to implement their ->listxattr() inode operation. New code
|
|
* should never use them.
|
|
*/
|
|
const struct xattr_handler nop_posix_acl_access = {
|
|
.name = XATTR_NAME_POSIX_ACL_ACCESS,
|
|
.list = posix_acl_xattr_list,
|
|
};
|
|
EXPORT_SYMBOL_GPL(nop_posix_acl_access);
|
|
|
|
/*
|
|
* nop_posix_acl_default - legacy xattr handler for default POSIX ACLs
|
|
*
|
|
* This is the legacy POSIX ACL default xattr handler. It is used by some
|
|
* filesystems to implement their ->listxattr() inode operation. New code
|
|
* should never use them.
|
|
*/
|
|
const struct xattr_handler nop_posix_acl_default = {
|
|
.name = XATTR_NAME_POSIX_ACL_DEFAULT,
|
|
.list = posix_acl_xattr_list,
|
|
};
|
|
EXPORT_SYMBOL_GPL(nop_posix_acl_default);
|
|
|
|
int simple_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
|
|
struct posix_acl *acl, int type)
|
|
{
|
|
int error;
|
|
struct inode *inode = d_inode(dentry);
|
|
|
|
if (type == ACL_TYPE_ACCESS) {
|
|
error = posix_acl_update_mode(idmap, inode,
|
|
&inode->i_mode, &acl);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
inode->i_ctime = current_time(inode);
|
|
if (IS_I_VERSION(inode))
|
|
inode_inc_iversion(inode);
|
|
set_cached_acl(inode, type, acl);
|
|
return 0;
|
|
}
|
|
|
|
int simple_acl_create(struct inode *dir, struct inode *inode)
|
|
{
|
|
struct posix_acl *default_acl, *acl;
|
|
int error;
|
|
|
|
error = posix_acl_create(dir, &inode->i_mode, &default_acl, &acl);
|
|
if (error)
|
|
return error;
|
|
|
|
set_cached_acl(inode, ACL_TYPE_DEFAULT, default_acl);
|
|
set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
|
|
|
|
if (default_acl)
|
|
posix_acl_release(default_acl);
|
|
if (acl)
|
|
posix_acl_release(acl);
|
|
return 0;
|
|
}
|
|
|
|
static int vfs_set_acl_idmapped_mnt(struct mnt_idmap *idmap,
|
|
struct user_namespace *fs_userns,
|
|
struct posix_acl *acl)
|
|
{
|
|
for (int n = 0; n < acl->a_count; n++) {
|
|
struct posix_acl_entry *acl_e = &acl->a_entries[n];
|
|
|
|
switch (acl_e->e_tag) {
|
|
case ACL_USER:
|
|
acl_e->e_uid = from_vfsuid(idmap, fs_userns,
|
|
VFSUIDT_INIT(acl_e->e_uid));
|
|
break;
|
|
case ACL_GROUP:
|
|
acl_e->e_gid = from_vfsgid(idmap, fs_userns,
|
|
VFSGIDT_INIT(acl_e->e_gid));
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* vfs_set_acl - set posix acls
|
|
* @idmap: idmap of the mount
|
|
* @dentry: the dentry based on which to set the posix acls
|
|
* @acl_name: the name of the posix acl
|
|
* @kacl: the posix acls in the appropriate VFS format
|
|
*
|
|
* This function sets @kacl. The caller must all posix_acl_release() on @kacl
|
|
* afterwards.
|
|
*
|
|
* Return: On success 0, on error negative errno.
|
|
*/
|
|
int vfs_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
|
|
const char *acl_name, struct posix_acl *kacl)
|
|
{
|
|
int acl_type;
|
|
int error;
|
|
struct inode *inode = d_inode(dentry);
|
|
struct inode *delegated_inode = NULL;
|
|
|
|
acl_type = posix_acl_type(acl_name);
|
|
if (acl_type < 0)
|
|
return -EINVAL;
|
|
|
|
if (kacl) {
|
|
/*
|
|
* If we're on an idmapped mount translate from mount specific
|
|
* vfs{g,u}id_t into global filesystem k{g,u}id_t.
|
|
* Afterwards we can cache the POSIX ACLs filesystem wide and -
|
|
* if this is a filesystem with a backing store - ultimately
|
|
* translate them to backing store values.
|
|
*/
|
|
error = vfs_set_acl_idmapped_mnt(idmap, i_user_ns(inode), kacl);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
retry_deleg:
|
|
inode_lock(inode);
|
|
|
|
/*
|
|
* We only care about restrictions the inode struct itself places upon
|
|
* us otherwise POSIX ACLs aren't subject to any VFS restrictions.
|
|
*/
|
|
error = may_write_xattr(idmap, inode);
|
|
if (error)
|
|
goto out_inode_unlock;
|
|
|
|
error = security_inode_set_acl(idmap, dentry, acl_name, kacl);
|
|
if (error)
|
|
goto out_inode_unlock;
|
|
|
|
error = try_break_deleg(inode, &delegated_inode);
|
|
if (error)
|
|
goto out_inode_unlock;
|
|
|
|
if (likely(!is_bad_inode(inode)))
|
|
error = set_posix_acl(idmap, dentry, acl_type, kacl);
|
|
else
|
|
error = -EIO;
|
|
if (!error) {
|
|
fsnotify_xattr(dentry);
|
|
evm_inode_post_set_acl(dentry, acl_name, kacl);
|
|
}
|
|
|
|
out_inode_unlock:
|
|
inode_unlock(inode);
|
|
|
|
if (delegated_inode) {
|
|
error = break_deleg_wait(&delegated_inode);
|
|
if (!error)
|
|
goto retry_deleg;
|
|
}
|
|
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vfs_set_acl);
|
|
|
|
/**
|
|
* vfs_get_acl - get posix acls
|
|
* @idmap: idmap of the mount
|
|
* @dentry: the dentry based on which to retrieve the posix acls
|
|
* @acl_name: the name of the posix acl
|
|
*
|
|
* This function retrieves @kacl from the filesystem. The caller must all
|
|
* posix_acl_release() on @kacl.
|
|
*
|
|
* Return: On success POSIX ACLs in VFS format, on error negative errno.
|
|
*/
|
|
struct posix_acl *vfs_get_acl(struct mnt_idmap *idmap,
|
|
struct dentry *dentry, const char *acl_name)
|
|
{
|
|
struct inode *inode = d_inode(dentry);
|
|
struct posix_acl *acl;
|
|
int acl_type, error;
|
|
|
|
acl_type = posix_acl_type(acl_name);
|
|
if (acl_type < 0)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
/*
|
|
* The VFS has no restrictions on reading POSIX ACLs so calling
|
|
* something like xattr_permission() isn't needed. Only LSMs get a say.
|
|
*/
|
|
error = security_inode_get_acl(idmap, dentry, acl_name);
|
|
if (error)
|
|
return ERR_PTR(error);
|
|
|
|
if (!IS_POSIXACL(inode))
|
|
return ERR_PTR(-EOPNOTSUPP);
|
|
if (S_ISLNK(inode->i_mode))
|
|
return ERR_PTR(-EOPNOTSUPP);
|
|
|
|
acl = __get_acl(idmap, dentry, inode, acl_type);
|
|
if (IS_ERR(acl))
|
|
return acl;
|
|
if (!acl)
|
|
return ERR_PTR(-ENODATA);
|
|
|
|
return acl;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vfs_get_acl);
|
|
|
|
/**
|
|
* vfs_remove_acl - remove posix acls
|
|
* @idmap: idmap of the mount
|
|
* @dentry: the dentry based on which to retrieve the posix acls
|
|
* @acl_name: the name of the posix acl
|
|
*
|
|
* This function removes posix acls.
|
|
*
|
|
* Return: On success 0, on error negative errno.
|
|
*/
|
|
int vfs_remove_acl(struct mnt_idmap *idmap, struct dentry *dentry,
|
|
const char *acl_name)
|
|
{
|
|
int acl_type;
|
|
int error;
|
|
struct inode *inode = d_inode(dentry);
|
|
struct inode *delegated_inode = NULL;
|
|
|
|
acl_type = posix_acl_type(acl_name);
|
|
if (acl_type < 0)
|
|
return -EINVAL;
|
|
|
|
retry_deleg:
|
|
inode_lock(inode);
|
|
|
|
/*
|
|
* We only care about restrictions the inode struct itself places upon
|
|
* us otherwise POSIX ACLs aren't subject to any VFS restrictions.
|
|
*/
|
|
error = may_write_xattr(idmap, inode);
|
|
if (error)
|
|
goto out_inode_unlock;
|
|
|
|
error = security_inode_remove_acl(idmap, dentry, acl_name);
|
|
if (error)
|
|
goto out_inode_unlock;
|
|
|
|
error = try_break_deleg(inode, &delegated_inode);
|
|
if (error)
|
|
goto out_inode_unlock;
|
|
|
|
if (likely(!is_bad_inode(inode)))
|
|
error = set_posix_acl(idmap, dentry, acl_type, NULL);
|
|
else
|
|
error = -EIO;
|
|
if (!error) {
|
|
fsnotify_xattr(dentry);
|
|
evm_inode_post_remove_acl(idmap, dentry, acl_name);
|
|
}
|
|
|
|
out_inode_unlock:
|
|
inode_unlock(inode);
|
|
|
|
if (delegated_inode) {
|
|
error = break_deleg_wait(&delegated_inode);
|
|
if (!error)
|
|
goto retry_deleg;
|
|
}
|
|
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vfs_remove_acl);
|
|
|
|
int do_set_acl(struct mnt_idmap *idmap, struct dentry *dentry,
|
|
const char *acl_name, const void *kvalue, size_t size)
|
|
{
|
|
int error;
|
|
struct posix_acl *acl = NULL;
|
|
|
|
if (size) {
|
|
/*
|
|
* Note that posix_acl_from_xattr() uses GFP_NOFS when it
|
|
* probably doesn't need to here.
|
|
*/
|
|
acl = posix_acl_from_xattr(current_user_ns(), kvalue, size);
|
|
if (IS_ERR(acl))
|
|
return PTR_ERR(acl);
|
|
}
|
|
|
|
error = vfs_set_acl(idmap, dentry, acl_name, acl);
|
|
posix_acl_release(acl);
|
|
return error;
|
|
}
|
|
|
|
ssize_t do_get_acl(struct mnt_idmap *idmap, struct dentry *dentry,
|
|
const char *acl_name, void *kvalue, size_t size)
|
|
{
|
|
ssize_t error;
|
|
struct posix_acl *acl;
|
|
|
|
acl = vfs_get_acl(idmap, dentry, acl_name);
|
|
if (IS_ERR(acl))
|
|
return PTR_ERR(acl);
|
|
|
|
error = vfs_posix_acl_to_xattr(idmap, d_inode(dentry),
|
|
acl, kvalue, size);
|
|
posix_acl_release(acl);
|
|
return error;
|
|
}
|