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kasan: pass tagged pointers to kasan_save_alloc/free_info

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Pass tagged pointers to kasan_save_alloc/free_info().

This is a preparatory patch to simplify other changes in the series.

Link: https://lkml.kernel.org/r/d5bc48cfcf0dca8269dc3ed863047e4d4d2030f1.1662411799.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 23:05:34 +02:00 • committed by Andrew Morton
parent 682ed08924
commit 6b07434980
4 changed files with 5 additions and 9 deletions
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6
mm/kasan/common.c
View file

@ -193,13 +193,11 @@ void * __must_check __kasan_init_slab_obj(struct kmem_cache *cache,
static inline bool ____kasan_slab_free(struct kmem_cache *cache, void *object,
unsigned long ip, bool quarantine, bool init)
{
u8 tag;
void *tagged_object;
if (!kasan_arch_is_ready())
return false;
tag = get_tag(object);
tagged_object = object;
object = kasan_reset_tag(object);
@ -228,7 +226,7 @@ static inline bool ____kasan_slab_free(struct kmem_cache *cache, void *object,
return false;
if (kasan_stack_collection_enabled())
kasan_save_free_info(cache, object, tag);
kasan_save_free_info(cache, tagged_object);
return kasan_quarantine_put(cache, object);
}
@ -317,7 +315,7 @@ void * __must_check __kasan_slab_alloc(struct kmem_cache *cache,
/* Save alloc info (if possible) for non-kmalloc() allocations. */
if (kasan_stack_collection_enabled() && !cache->kasan_info.is_kmalloc)
kasan_save_alloc_info(cache, (void *)object, flags);
kasan_save_alloc_info(cache, tagged_object, flags);
return tagged_object;
}

3
mm/kasan/generic.c
View file

@ -500,8 +500,7 @@ void kasan_save_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags)
kasan_set_track(&alloc_meta->alloc_track, flags);
}
void kasan_save_free_info(struct kmem_cache *cache,
void *object, u8 tag)
void kasan_save_free_info(struct kmem_cache *cache, void *object)
{
struct kasan_free_meta *free_meta;

2
mm/kasan/kasan.h
View file

@ -309,7 +309,7 @@ static inline void kasan_init_object_meta(struct kmem_cache *cache, const void *
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, u8 tag);
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,

3
mm/kasan/tags.c
View file

@ -21,8 +21,7 @@ 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, u8 tag)
void kasan_save_free_info(struct kmem_cache *cache, void *object)
{
}