diff options
| author | Andrey Konovalov <andreyknvl@google.com> | 2022-09-05 23:05:22 +0200 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-10-03 14:02:57 -0700 |
| commit | f3647cbfe5a34af1a22f2627dda5fb078a47f0d3 (patch) | |
| tree | ccdfa5e0a8d8f4a13e9c68bc10068211b24ac6a5 /mm/kasan | |
| parent | 88f29765ae3b00f8b9362f299f6140cd9b988f75 (diff) | |
kasan: introduce kasan_get_alloc_track
Add a kasan_get_alloc_track() helper that fetches alloc_track for a slab
object and use this helper in the common reporting code.
For now, the implementations of this helper are the same for the Generic
and tag-based modes, but they will diverge later in the series.
This change hides references to alloc_meta from the common reporting code.
This is desired as only the Generic mode will be using per-object
metadata after this series.
Link: https://lkml.kernel.org/r/0c365a35f4a833fff46f9d42c3212b32f7166556.1662411799.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>
Diffstat (limited to 'mm/kasan')
| -rw-r--r-- | mm/kasan/generic.c | 14 | ||||
| -rw-r--r-- | mm/kasan/kasan.h | 4 | ||||
| -rw-r--r-- | mm/kasan/report.c | 8 | ||||
| -rw-r--r-- | mm/kasan/tags.c | 14 |
4 files changed, 33 insertions, 7 deletions
diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c index 98c451a3b01f..f212b9ae57b5 100644 --- a/mm/kasan/generic.c +++ b/mm/kasan/generic.c @@ -381,8 +381,20 @@ void kasan_save_free_info(struct kmem_cache *cache, *(u8 *)kasan_mem_to_shadow(object) = KASAN_SLAB_FREETRACK; } +struct kasan_track *kasan_get_alloc_track(struct kmem_cache *cache, + void *object) +{ + struct kasan_alloc_meta *alloc_meta; + + 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, - void *object, u8 tag) + void *object, u8 tag) { if (*(u8 *)kasan_mem_to_shadow(object) != KASAN_SLAB_FREETRACK) return NULL; diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h index 30ff341b6d35..b65a51349c51 100644 --- a/mm/kasan/kasan.h +++ b/mm/kasan/kasan.h @@ -283,8 +283,10 @@ 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); +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); + void *object, u8 tag); #if defined(CONFIG_KASAN_GENERIC) && \ (defined(CONFIG_SLAB) || defined(CONFIG_SLUB)) diff --git a/mm/kasan/report.c b/mm/kasan/report.c index cd9f5c7fc6db..5d225d7d9c4c 100644 --- a/mm/kasan/report.c +++ b/mm/kasan/report.c @@ -255,12 +255,12 @@ static void describe_object_addr(struct kmem_cache *cache, void *object, static void describe_object_stacks(struct kmem_cache *cache, void *object, const void *addr, u8 tag) { - struct kasan_alloc_meta *alloc_meta; + struct kasan_track *alloc_track; struct kasan_track *free_track; - alloc_meta = kasan_get_alloc_meta(cache, object); - if (alloc_meta) { - print_track(&alloc_meta->alloc_track, "Allocated"); + alloc_track = kasan_get_alloc_track(cache, object); + if (alloc_track) { + print_track(alloc_track, "Allocated"); pr_err("\n"); } diff --git a/mm/kasan/tags.c b/mm/kasan/tags.c index e0e5de8ce834..7b1fc8e7c99c 100644 --- a/mm/kasan/tags.c +++ b/mm/kasan/tags.c @@ -38,8 +38,20 @@ void kasan_save_free_info(struct kmem_cache *cache, kasan_set_track(&alloc_meta->free_track, GFP_NOWAIT); } +struct kasan_track *kasan_get_alloc_track(struct kmem_cache *cache, + void *object) +{ + struct kasan_alloc_meta *alloc_meta; + + 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, - void *object, u8 tag) + void *object, u8 tag) { struct kasan_alloc_meta *alloc_meta; |