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mm/kasan: Convert to struct folio and struct slab

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KASAN accesses some slab related struct page fields so we need to
convert it to struct slab. Some places are a bit simplified thanks to
kasan_addr_to_slab() encapsulating the PageSlab flag check through
virt_to_slab().  When resolving object address to either a real slab or
a large kmalloc, use struct folio as the intermediate type for testing
the slab flag to avoid unnecessary implicit compound_head().

[ vbabka@suse.cz: use struct folio, adjust to differences in previous
  patches ]

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Reviewed-by: Roman Gushchin <guro@fb.com>
Tested-by: Hyeongogn Yoo <42.hyeyoo@gmail.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: <kasan-dev@googlegroups.com>
This commit is contained in:
Matthew Wilcox (Oracle) 2021-10-04 14:46:46 +01:00 • committed by Vlastimil Babka
parent 50757018b4
commit 6e48a966df
9 changed files with 42 additions and 28 deletions
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9
include/linux/kasan.h
View file

@ -9,6 +9,7 @@
struct kmem_cache;
struct page;
struct slab;
struct vm_struct;
struct task_struct;
@ -193,11 +194,11 @@ static __always_inline size_t kasan_metadata_size(struct kmem_cache *cache)
return 0;
}
void __kasan_poison_slab(struct page *page);
static __always_inline void kasan_poison_slab(struct page *page)
void __kasan_poison_slab(struct slab *slab);
static __always_inline void kasan_poison_slab(struct slab *slab)
{
if (kasan_enabled())
__kasan_poison_slab(page);
__kasan_poison_slab(slab);
}
void __kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
@ -322,7 +323,7 @@ static inline void kasan_cache_create(struct kmem_cache *cache,
slab_flags_t *flags) {}
static inline void kasan_cache_create_kmalloc(struct kmem_cache *cache) {}
static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
static inline void kasan_poison_slab(struct page *page) {}
static inline void kasan_poison_slab(struct slab *slab) {}
static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
void *object) {}
static inline void kasan_poison_object_data(struct kmem_cache *cache,