diff options
author | Matthew Wilcox (Oracle) <willy@infradead.org> | 2021-10-04 16:46:46 +0300 |
---|---|---|
committer | Vlastimil Babka <vbabka@suse.cz> | 2022-01-06 14:26:14 +0300 |
commit | 6e48a966dfd18987fec9385566a67d36e2b5fc11 (patch) | |
tree | 86563a5541c93ba5be6ba7963d2e58ada19ebd82 /mm/kasan | |
parent | 50757018b4c9b02dbf7fcc0514e0fc45b8689c62 (diff) | |
download | linux-6e48a966dfd18987fec9385566a67d36e2b5fc11.tar.xz |
mm/kasan: Convert to struct folio and struct slab
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>
Diffstat (limited to 'mm/kasan')
-rw-r--r-- | mm/kasan/common.c | 23 | ||||
-rw-r--r-- | mm/kasan/generic.c | 8 | ||||
-rw-r--r-- | mm/kasan/kasan.h | 1 | ||||
-rw-r--r-- | mm/kasan/quarantine.c | 2 | ||||
-rw-r--r-- | mm/kasan/report.c | 13 | ||||
-rw-r--r-- | mm/kasan/report_tags.c | 10 |
6 files changed, 35 insertions, 22 deletions
diff --git a/mm/kasan/common.c b/mm/kasan/common.c index 6a1cd2d38bff..7c06db78a76c 100644 --- a/mm/kasan/common.c +++ b/mm/kasan/common.c @@ -247,8 +247,9 @@ struct kasan_free_meta *kasan_get_free_meta(struct kmem_cache *cache, } #endif -void __kasan_poison_slab(struct page *page) +void __kasan_poison_slab(struct slab *slab) { + struct page *page = slab_page(slab); unsigned long i; for (i = 0; i < compound_nr(page); i++) @@ -401,9 +402,9 @@ void __kasan_kfree_large(void *ptr, unsigned long ip) void __kasan_slab_free_mempool(void *ptr, unsigned long ip) { - struct page *page; + struct folio *folio; - page = virt_to_head_page(ptr); + folio = virt_to_folio(ptr); /* * Even though this function is only called for kmem_cache_alloc and @@ -411,12 +412,14 @@ void __kasan_slab_free_mempool(void *ptr, unsigned long ip) * !PageSlab() when the size provided to kmalloc is larger than * KMALLOC_MAX_SIZE, and kmalloc falls back onto page_alloc. */ - if (unlikely(!PageSlab(page))) { + if (unlikely(!folio_test_slab(folio))) { if (____kasan_kfree_large(ptr, ip)) return; - kasan_poison(ptr, page_size(page), KASAN_FREE_PAGE, false); + kasan_poison(ptr, folio_size(folio), KASAN_FREE_PAGE, false); } else { - ____kasan_slab_free(page->slab_cache, ptr, ip, false, false); + struct slab *slab = folio_slab(folio); + + ____kasan_slab_free(slab->slab_cache, ptr, ip, false, false); } } @@ -560,7 +563,7 @@ void * __must_check __kasan_kmalloc_large(const void *ptr, size_t size, void * __must_check __kasan_krealloc(const void *object, size_t size, gfp_t flags) { - struct page *page; + struct slab *slab; if (unlikely(object == ZERO_SIZE_PTR)) return (void *)object; @@ -572,13 +575,13 @@ void * __must_check __kasan_krealloc(const void *object, size_t size, gfp_t flag */ kasan_unpoison(object, size, false); - page = virt_to_head_page(object); + slab = virt_to_slab(object); /* Piggy-back on kmalloc() instrumentation to poison the redzone. */ - if (unlikely(!PageSlab(page))) + if (unlikely(!slab)) return __kasan_kmalloc_large(object, size, flags); else - return ____kasan_kmalloc(page->slab_cache, object, size, flags); + return ____kasan_kmalloc(slab->slab_cache, object, size, flags); } bool __kasan_check_byte(const void *address, unsigned long ip) diff --git a/mm/kasan/generic.c b/mm/kasan/generic.c index 5d0b79416c4e..a25ad4090615 100644 --- a/mm/kasan/generic.c +++ b/mm/kasan/generic.c @@ -330,16 +330,16 @@ DEFINE_ASAN_SET_SHADOW(f8); static void __kasan_record_aux_stack(void *addr, bool can_alloc) { - struct page *page = kasan_addr_to_page(addr); + struct slab *slab = kasan_addr_to_slab(addr); struct kmem_cache *cache; struct kasan_alloc_meta *alloc_meta; void *object; - if (is_kfence_address(addr) || !(page && PageSlab(page))) + if (is_kfence_address(addr) || !slab) return; - cache = page->slab_cache; - object = nearest_obj(cache, page_slab(page), addr); + cache = slab->slab_cache; + object = nearest_obj(cache, slab, addr); alloc_meta = kasan_get_alloc_meta(cache, object); if (!alloc_meta) return; diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h index aebd8df86a1f..c17fa8d26ffe 100644 --- a/mm/kasan/kasan.h +++ b/mm/kasan/kasan.h @@ -265,6 +265,7 @@ bool kasan_report(unsigned long addr, size_t size, void kasan_report_invalid_free(void *object, unsigned long ip); struct page *kasan_addr_to_page(const void *addr); +struct slab *kasan_addr_to_slab(const void *addr); depot_stack_handle_t kasan_save_stack(gfp_t flags, bool can_alloc); void kasan_set_track(struct kasan_track *track, gfp_t flags); diff --git a/mm/kasan/quarantine.c b/mm/kasan/quarantine.c index d8ccff4c1275..587da8995f2d 100644 --- a/mm/kasan/quarantine.c +++ b/mm/kasan/quarantine.c @@ -117,7 +117,7 @@ static unsigned long quarantine_batch_size; static struct kmem_cache *qlink_to_cache(struct qlist_node *qlink) { - return virt_to_head_page(qlink)->slab_cache; + return virt_to_slab(qlink)->slab_cache; } static void *qlink_to_object(struct qlist_node *qlink, struct kmem_cache *cache) diff --git a/mm/kasan/report.c b/mm/kasan/report.c index e00999dc6499..3ad9624dcc56 100644 --- a/mm/kasan/report.c +++ b/mm/kasan/report.c @@ -150,6 +150,14 @@ struct page *kasan_addr_to_page(const void *addr) return NULL; } +struct slab *kasan_addr_to_slab(const void *addr) +{ + if ((addr >= (void *)PAGE_OFFSET) && + (addr < high_memory)) + return virt_to_slab(addr); + return NULL; +} + static void describe_object_addr(struct kmem_cache *cache, void *object, const void *addr) { @@ -248,8 +256,9 @@ static void print_address_description(void *addr, u8 tag) pr_err("\n"); if (page && PageSlab(page)) { - struct kmem_cache *cache = page->slab_cache; - void *object = nearest_obj(cache, page_slab(page), addr); + struct slab *slab = page_slab(page); + struct kmem_cache *cache = slab->slab_cache; + void *object = nearest_obj(cache, slab, addr); describe_object(cache, object, addr, tag); } diff --git a/mm/kasan/report_tags.c b/mm/kasan/report_tags.c index 06c21dd77493..1b41de88c53e 100644 --- a/mm/kasan/report_tags.c +++ b/mm/kasan/report_tags.c @@ -12,7 +12,7 @@ const char *kasan_get_bug_type(struct kasan_access_info *info) #ifdef CONFIG_KASAN_TAGS_IDENTIFY struct kasan_alloc_meta *alloc_meta; struct kmem_cache *cache; - struct page *page; + struct slab *slab; const void *addr; void *object; u8 tag; @@ -20,10 +20,10 @@ const char *kasan_get_bug_type(struct kasan_access_info *info) tag = get_tag(info->access_addr); addr = kasan_reset_tag(info->access_addr); - page = kasan_addr_to_page(addr); - if (page && PageSlab(page)) { - cache = page->slab_cache; - object = nearest_obj(cache, page_slab(page), (void *)addr); + slab = kasan_addr_to_slab(addr); + if (slab) { + cache = slab->slab_cache; + object = nearest_obj(cache, slab, (void *)addr); alloc_meta = kasan_get_alloc_meta(cache, object); if (alloc_meta) { |