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kasan: clear metadata functions for tag-based modes 

Remove implementations of the metadata-related functions for the tag-based
modes.

The following patches in the series will provide alternative
implementations.

As of this patch, the tag-based modes no longer collect alloc and free
stack traces.  This functionality will be restored later in the series.

Link: https://lkml.kernel.org/r/470fbe5d15e8015092e76e395de354be18ccceab.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 23:05:24 +02:00 committed by Andrew Morton
parent 836daba099
commit 74984e7907
1 changed files with 2 additions and 31 deletions
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33
mm/kasan/tags.c
View File

@ -19,54 +19,25 @@
void kasan_init_object_meta(struct kmem_cache *cache, const void *object) void kasan_init_object_meta(struct kmem_cache *cache, const void *object)
{ {
struct kasan_alloc_meta *alloc_meta;
alloc_meta = kasan_get_alloc_meta(cache, object);
if (alloc_meta)
__memset(alloc_meta, 0, sizeof(*alloc_meta));
} }
void kasan_save_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags) void kasan_save_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags)
{ {
struct kasan_alloc_meta *alloc_meta;
alloc_meta = kasan_get_alloc_meta(cache, object);
if (alloc_meta)
kasan_set_track(&alloc_meta->alloc_track, flags);
} }
void kasan_save_free_info(struct kmem_cache *cache, void kasan_save_free_info(struct kmem_cache *cache,
void *object, u8 tag) void *object, u8 tag)
{ {
struct kasan_alloc_meta *alloc_meta;
alloc_meta = kasan_get_alloc_meta(cache, object);
if (!alloc_meta)
return;
kasan_set_track(&alloc_meta->free_track, GFP_NOWAIT);
} }
struct kasan_track *kasan_get_alloc_track(struct kmem_cache *cache, struct kasan_track *kasan_get_alloc_track(struct kmem_cache *cache,
void *object) void *object)
{ {
struct kasan_alloc_meta *alloc_meta; return NULL;
alloc_meta = kasan_get_alloc_meta(cache, object);
if (!alloc_meta)
return NULL;
return &alloc_meta->alloc_track;
} }
struct kasan_track *kasan_get_free_track(struct kmem_cache *cache, struct kasan_track *kasan_get_free_track(struct kmem_cache *cache,
void *object, u8 tag) void *object, u8 tag)
{ {
struct kasan_alloc_meta *alloc_meta; return NULL;
alloc_meta = kasan_get_alloc_meta(cache, object);
if (!alloc_meta)
return NULL;
return &alloc_meta->free_track;
} }