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kasan: introduce kasan_complete_mode_report_info

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Add bug_type and alloc/free_track fields to kasan_report_info and add a
kasan_complete_mode_report_info() function that fills in these fields. 
This function is implemented differently for different KASAN mode.

Change the reporting code to use the filled in fields instead of invoking
kasan_get_bug_type() and kasan_get_alloc/free_track().

For the Generic mode, kasan_complete_mode_report_info() invokes these
functions instead.  For the tag-based modes, only the bug_type field is
filled in; alloc/free_track are handled in the next patch.

Using a single function that fills in these fields is required for the
tag-based modes, as the values for all three fields are determined in a
single procedure implemented in the following patch.

Link: https://lkml.kernel.org/r/8432b861054fa8d0cee79a8877dedeaf3b677ca8.1662411799.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Marco Elver <elver@google.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Peter Collingbourne <pcc@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Andrey Konovalov 2022-09-05 23:05:44 +02:00 committed by Andrew Morton
parent 92a38eacd6
commit 59e6e098d1
4 changed files with 51 additions and 57 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
mm/kasan/kasan.h
View File

@ -146,6 +146,13 @@ static inline bool kasan_requires_meta(void)
#define META_MEM_BYTES_PER_ROW (META_BYTES_PER_ROW * KASAN_GRANULE_SIZE)
#define META_ROWS_AROUND_ADDR 2
#define KASAN_STACK_DEPTH 64
struct kasan_track {
u32 pid;
depot_stack_handle_t stack;
};
enum kasan_report_type {
KASAN_REPORT_ACCESS,
KASAN_REPORT_INVALID_FREE,
@ -164,6 +171,11 @@ struct kasan_report_info {
void *first_bad_addr;
struct kmem_cache *cache;
void *object;
/* Filled in by the mode-specific reporting code. */
const char *bug_type;
struct kasan_track alloc_track;
struct kasan_track free_track;
};
/* Do not change the struct layout: compiler ABI. */
@ -189,14 +201,7 @@ struct kasan_global {
#endif
};
/* Structures for keeping alloc and free tracks. */
#define KASAN_STACK_DEPTH 64
struct kasan_track {
u32 pid;
depot_stack_handle_t stack;
};
/* Structures for keeping alloc and free meta. */
#ifdef CONFIG_KASAN_GENERIC
@ -270,16 +275,16 @@ static inline bool addr_has_metadata(const void *addr)
#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
void *kasan_find_first_bad_addr(void *addr, size_t size);
void kasan_complete_mode_report_info(struct kasan_report_info *info);
void kasan_metadata_fetch_row(char *buffer, void *row);
#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
void kasan_print_tags(u8 addr_tag, const void *addr);
#else
static inline void kasan_print_tags(u8 addr_tag, const void *addr) { }
#endif
void *kasan_find_first_bad_addr(void *addr, size_t size);
const char *kasan_get_bug_type(struct kasan_report_info *info);
void kasan_metadata_fetch_row(char *buffer, void *row);
#if defined(CONFIG_KASAN_STACK)
void kasan_print_address_stack_frame(const void *addr);
#else
@ -314,10 +319,6 @@ depot_stack_handle_t kasan_save_stack(gfp_t flags, bool can_alloc);
void kasan_set_track(struct kasan_track *track, gfp_t flags);
void kasan_save_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags);
void kasan_save_free_info(struct kmem_cache *cache, void *object);
struct kasan_track *kasan_get_alloc_track(struct kmem_cache *cache,
void *object);
struct kasan_track *kasan_get_free_track(struct kmem_cache *cache,
void *object, u8 tag);
#if defined(CONFIG_KASAN_GENERIC) && \
(defined(CONFIG_SLAB) || defined(CONFIG_SLUB))

30
mm/kasan/report.c
View File

@ -185,8 +185,7 @@ static void print_error_description(struct kasan_report_info *info)
return;
}
pr_err("BUG: KASAN: %s in %pS\n",
kasan_get_bug_type(info), (void *)info->ip);
pr_err("BUG: KASAN: %s in %pS\n", info->bug_type, (void *)info->ip);
if (info->access_size)
pr_err("%s of size %zu at addr %px by task %s/%d\n",
info->is_write ? "Write" : "Read", info->access_size,
@ -242,31 +241,25 @@ static void describe_object_addr(const void *addr, struct kmem_cache *cache,
(void *)(object_addr + cache->object_size));
}
static void describe_object_stacks(u8 tag, struct kasan_report_info *info)
static void describe_object_stacks(struct kasan_report_info *info)
{
struct kasan_track *alloc_track;
struct kasan_track *free_track;
alloc_track = kasan_get_alloc_track(info->cache, info->object);
if (alloc_track) {
print_track(alloc_track, "Allocated");
if (info->alloc_track.stack) {
print_track(&info->alloc_track, "Allocated");
pr_err("\n");
}
free_track = kasan_get_free_track(info->cache, info->object, tag);
if (free_track) {
print_track(free_track, "Freed");
if (info->free_track.stack) {
print_track(&info->free_track, "Freed");
pr_err("\n");
}
kasan_print_aux_stacks(info->cache, info->object);
}
static void describe_object(const void *addr, u8 tag,
struct kasan_report_info *info)
static void describe_object(const void *addr, struct kasan_report_info *info)
{
if (kasan_stack_collection_enabled())
describe_object_stacks(tag, info);
describe_object_stacks(info);
describe_object_addr(addr, info->cache, info->object);
}
@ -295,7 +288,7 @@ static void print_address_description(void *addr, u8 tag,
pr_err("\n");
if (info->cache && info->object) {
describe_object(addr, tag, info);
describe_object(addr, info);
pr_err("\n");
}
@ -426,6 +419,9 @@ static void complete_report_info(struct kasan_report_info *info)
info->object = nearest_obj(info->cache, slab, addr);
} else
info->cache = info->object = NULL;
/* Fill in mode-specific report info fields. */
kasan_complete_mode_report_info(info);
}
void kasan_report_invalid_free(void *ptr, unsigned long ip, enum kasan_report_type type)
@ -443,6 +439,7 @@ void kasan_report_invalid_free(void *ptr, unsigned long ip, enum kasan_report_ty
start_report(&flags, true);
memset(&info, 0, sizeof(info));
info.type = type;
info.access_addr = ptr;
info.access_size = 0;
@ -477,6 +474,7 @@ bool kasan_report(unsigned long addr, size_t size, bool is_write,
start_report(&irq_flags, true);
memset(&info, 0, sizeof(info));
info.type = KASAN_REPORT_ACCESS;
info.access_addr = ptr;
info.access_size = size;

32
mm/kasan/report_generic.c
View File

@ -109,7 +109,7 @@ static const char *get_wild_bug_type(struct kasan_report_info *info)
return bug_type;
}
const char *kasan_get_bug_type(struct kasan_report_info *info)
static const char *get_bug_type(struct kasan_report_info *info)
{
/*
* If access_size is a negative number, then it has reason to be
@ -127,25 +127,27 @@ const char *kasan_get_bug_type(struct kasan_report_info *info)
return get_wild_bug_type(info);
}
struct kasan_track *kasan_get_alloc_track(struct kmem_cache *cache,
void *object)
void kasan_complete_mode_report_info(struct kasan_report_info *info)
{
struct kasan_alloc_meta *alloc_meta;
struct kasan_free_meta *free_meta;
alloc_meta = kasan_get_alloc_meta(cache, object);
if (!alloc_meta)
return NULL;
info->bug_type = get_bug_type(info);
return &alloc_meta->alloc_track;
}
if (!info->cache || !info->object)
return;
struct kasan_track *kasan_get_free_track(struct kmem_cache *cache,
void *object, u8 tag)
{
if (*(u8 *)kasan_mem_to_shadow(object) != KASAN_SLAB_FREETRACK)
return NULL;
/* Free meta must be present with KASAN_SLAB_FREETRACK. */
return &kasan_get_free_meta(cache, object)->free_track;
alloc_meta = kasan_get_alloc_meta(info->cache, info->object);
if (alloc_meta)
memcpy(&info->alloc_track, &alloc_meta->alloc_track,
sizeof(info->alloc_track));
if (*(u8 *)kasan_mem_to_shadow(info->object) == KASAN_SLAB_FREETRACK) {
/* Free meta must be present with KASAN_SLAB_FREETRACK. */
free_meta = kasan_get_free_meta(info->cache, info->object);
memcpy(&info->free_track, &free_meta->free_track,
sizeof(info->free_track));
}
}
void kasan_metadata_fetch_row(char *buffer, void *row)

13
mm/kasan/report_tags.c
View File

@ -6,7 +6,7 @@
#include "kasan.h"
const char *kasan_get_bug_type(struct kasan_report_info *info)
static const char *get_bug_type(struct kasan_report_info *info)
{
/*
* If access_size is a negative number, then it has reason to be
@ -22,14 +22,7 @@ const char *kasan_get_bug_type(struct kasan_report_info *info)
return "invalid-access";
}
struct kasan_track *kasan_get_alloc_track(struct kmem_cache *cache,
void *object)
void kasan_complete_mode_report_info(struct kasan_report_info *info)
{
return NULL;
}
struct kasan_track *kasan_get_free_track(struct kmem_cache *cache,
void *object, u8 tag)
{
return NULL;
info->bug_type = get_bug_type(info);
}