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kasan, slub: move kasan_poison_slab hook before page_address

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With tag based KASAN page_address() looks at the page flags to see whether
the resulting pointer needs to have a tag set.  Since we don't want to set
a tag when page_address() is called on SLAB pages, we call
page_kasan_tag_reset() in kasan_poison_slab().  However in allocate_slab()
page_address() is called before kasan_poison_slab().  Fix it by changing
the order.

[[email protected]: fix compilation error when CONFIG_SLUB_DEBUG=n]
  Link: http://lkml.kernel.org/r/ac27cc0bbaeb414ed77bcd6671a877cf3546d56e.1550066133.git.andreyknvl@google.com
Link: http://lkml.kernel.org/r/cd895d627465a3f1c712647072d17f10883be2a1.1549921721.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <[email protected]>
Cc: Alexander Potapenko <[email protected]>
Cc: Andrey Ryabinin <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Evgeniy Stepanov <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: Kostya Serebryany <[email protected]>
Cc: Pekka Enberg <[email protected]>
Cc: Qian Cai <[email protected]>
Cc: Vincenzo Frascino <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andrey Konovalov 2019-02-20 22:19:23 -08:00 • committed by Linus Torvalds
commit a710122428
1 changed files with 15 additions and 4 deletions
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19
mm/slub.c
View file

@ -1075,6 +1075,16 @@ static void setup_object_debug(struct kmem_cache *s, struct page *page,
init_tracking(s, object);
}
static void setup_page_debug(struct kmem_cache *s, void *addr, int order)
{
if (!(s->flags & SLAB_POISON))
return;
metadata_access_enable();
memset(addr, POISON_INUSE, PAGE_SIZE << order);
metadata_access_disable();
}
static inline int alloc_consistency_checks(struct kmem_cache *s,
struct page *page,
void *object, unsigned long addr)
@ -1330,6 +1340,8 @@ slab_flags_t kmem_cache_flags(unsigned int object_size,
#else /* !CONFIG_SLUB_DEBUG */
static inline void setup_object_debug(struct kmem_cache *s,
struct page *page, void *object) {}
static inline void setup_page_debug(struct kmem_cache *s,
void *addr, int order) {}
static inline int alloc_debug_processing(struct kmem_cache *s,
struct page *page, void *object, unsigned long addr) { return 0; }
@ -1643,12 +1655,11 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
if (page_is_pfmemalloc(page))
SetPageSlabPfmemalloc(page);
kasan_poison_slab(page);
start = page_address(page);
if (unlikely(s->flags & SLAB_POISON))
memset(start, POISON_INUSE, PAGE_SIZE << order);
kasan_poison_slab(page);
setup_page_debug(s, start, order);
shuffle = shuffle_freelist(s, page);