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kasan: save free stack traces for slab mempools

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Make kasan_mempool_poison_object save free stack traces for slab and
kmalloc mempools when the object is freed into the mempool.

Also simplify and rename ____kasan_slab_free to poison_slab_object and do
a few other reability changes.

Link: https://lkml.kernel.org/r/413a7c7c3344fb56809853339ffaabc9e4905e94.1703024586.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Cc: Alexander Lobakin <alobakin@pm.me>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Breno Leitao <leitao@debian.org>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Evgenii Stepanov <eugenis@google.com>
Cc: Marco Elver <elver@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Andrey Konovalov 2023-12-19 23:28:53 +01:00 committed by Andrew Morton
parent cf0da2afe3
commit b556a462eb
2 changed files with 12 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/linux/kasan.h
View File

@ -268,8 +268,9 @@ bool __kasan_mempool_poison_object(void *ptr, unsigned long ip);
* to reuse them instead of freeing them back to the slab allocator (e.g.
* mempool).
*
* This function poisons a slab allocation without initializing its memory and
* without putting it into the quarantine (for the Generic mode).
* This function poisons a slab allocation and saves a free stack trace for it
* without initializing the allocation's memory and without putting it into the
* quarantine (for the Generic mode).
*
* This function also performs checks to detect double-free and invalid-free
* bugs and reports them. The caller can use the return value of this function

20
mm/kasan/common.c
View File

@ -207,8 +207,8 @@ void * __must_check __kasan_init_slab_obj(struct kmem_cache *cache,
return (void *)object;
}
static inline bool ____kasan_slab_free(struct kmem_cache *cache, void *object,
unsigned long ip, bool quarantine, bool init)
static inline bool poison_slab_object(struct kmem_cache *cache, void *object,
unsigned long ip, bool init)
{
void *tagged_object;
@ -221,13 +221,12 @@ static inline bool ____kasan_slab_free(struct kmem_cache *cache, void *object,
if (is_kfence_address(object))
return false;
if (unlikely(nearest_obj(cache, virt_to_slab(object), object) !=
object)) {
if (unlikely(nearest_obj(cache, virt_to_slab(object), object) != object)) {
kasan_report_invalid_free(tagged_object, ip, KASAN_REPORT_INVALID_FREE);
return true;
}
/* RCU slabs could be legally used after free within the RCU period */
/* RCU slabs could be legally used after free within the RCU period. */
if (unlikely(cache->flags & SLAB_TYPESAFE_BY_RCU))
return false;
@ -239,19 +238,18 @@ static inline bool ____kasan_slab_free(struct kmem_cache *cache, void *object,
kasan_poison(object, round_up(cache->object_size, KASAN_GRANULE_SIZE),
KASAN_SLAB_FREE, init);
if ((IS_ENABLED(CONFIG_KASAN_GENERIC) && !quarantine))
return false;
if (kasan_stack_collection_enabled())
kasan_save_free_info(cache, tagged_object);
return kasan_quarantine_put(cache, object);
return false;
}
bool __kasan_slab_free(struct kmem_cache *cache, void *object,
unsigned long ip, bool init)
{
return ____kasan_slab_free(cache, object, ip, true, init);
bool buggy_object = poison_slab_object(cache, object, ip, init);
return buggy_object ? true : kasan_quarantine_put(cache, object);
}
static inline bool check_page_allocation(void *ptr, unsigned long ip)
@ -472,7 +470,7 @@ bool __kasan_mempool_poison_object(void *ptr, unsigned long ip)
}
slab = folio_slab(folio);
return !____kasan_slab_free(slab->slab_cache, ptr, ip, false, false);
return !poison_slab_object(slab->slab_cache, ptr, ip, false);
}
void __kasan_mempool_unpoison_object(void *ptr, size_t size, unsigned long ip)