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authorAndrey Konovalov <andreyknvl@google.com>2020-12-22 12:03:10 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2020-12-22 12:55:09 -0800
commit34303244f2615add92076a4bf2d4f39323bde4f2 (patch)
tree0507232078dd68ce704ff6a71fc1770fad6c9af8 /mm
parent8028caaca7a8107a52bb28fd92dea35bebd7ae8e (diff)
kasan, mm: check kasan_enabled in annotations
Declare the kasan_enabled static key in include/linux/kasan.h and in include/linux/mm.h and check it in all kasan annotations. This allows to avoid any slowdown caused by function calls when kasan_enabled is disabled. Link: https://lkml.kernel.org/r/9f90e3c0aa840dbb4833367c2335193299f69023.1606162397.git.andreyknvl@google.com Link: https://linux-review.googlesource.com/id/I2589451d3c96c97abbcbf714baabe6161c6f153e Co-developed-by: Vincenzo Frascino <Vincenzo.Frascino@arm.com> Signed-off-by: Vincenzo Frascino <Vincenzo.Frascino@arm.com> Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Reviewed-by: Marco Elver <elver@google.com> Reviewed-by: Dmitry Vyukov <dvyukov@google.com> Tested-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Cc: Alexander Potapenko <glider@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Branislav Rankov <Branislav.Rankov@arm.com> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Evgenii Stepanov <eugenis@google.com> Cc: Kevin Brodsky <kevin.brodsky@arm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Will Deacon <will.deacon@arm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/kasan/common.c56
1 files changed, 28 insertions, 28 deletions
diff --git a/mm/kasan/common.c b/mm/kasan/common.c
index 219c2979bd3e..ae0130cf9de3 100644
--- a/mm/kasan/common.c
+++ b/mm/kasan/common.c
@@ -58,7 +58,7 @@ void kasan_disable_current(void)
}
#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
-void kasan_unpoison_range(const void *address, size_t size)
+void __kasan_unpoison_range(const void *address, size_t size)
{
unpoison_range(address, size);
}
@@ -86,7 +86,7 @@ asmlinkage void kasan_unpoison_task_stack_below(const void *watermark)
}
#endif /* CONFIG_KASAN_STACK */
-void kasan_alloc_pages(struct page *page, unsigned int order)
+void __kasan_alloc_pages(struct page *page, unsigned int order)
{
u8 tag;
unsigned long i;
@@ -100,7 +100,7 @@ void kasan_alloc_pages(struct page *page, unsigned int order)
unpoison_range(page_address(page), PAGE_SIZE << order);
}
-void kasan_free_pages(struct page *page, unsigned int order)
+void __kasan_free_pages(struct page *page, unsigned int order)
{
if (likely(!PageHighMem(page)))
poison_range(page_address(page),
@@ -127,8 +127,8 @@ static inline unsigned int optimal_redzone(unsigned int object_size)
object_size <= (1 << 16) - 1024 ? 1024 : 2048;
}
-void kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
- slab_flags_t *flags)
+void __kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
+ slab_flags_t *flags)
{
unsigned int orig_size = *size;
unsigned int redzone_size;
@@ -173,7 +173,7 @@ void kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
*flags |= SLAB_KASAN;
}
-size_t kasan_metadata_size(struct kmem_cache *cache)
+size_t __kasan_metadata_size(struct kmem_cache *cache)
{
if (!kasan_stack_collection_enabled())
return 0;
@@ -196,7 +196,7 @@ struct kasan_free_meta *kasan_get_free_meta(struct kmem_cache *cache,
return kasan_reset_tag(object) + cache->kasan_info.free_meta_offset;
}
-void kasan_poison_slab(struct page *page)
+void __kasan_poison_slab(struct page *page)
{
unsigned long i;
@@ -206,12 +206,12 @@ void kasan_poison_slab(struct page *page)
KASAN_KMALLOC_REDZONE);
}
-void kasan_unpoison_object_data(struct kmem_cache *cache, void *object)
+void __kasan_unpoison_object_data(struct kmem_cache *cache, void *object)
{
unpoison_range(object, cache->object_size);
}
-void kasan_poison_object_data(struct kmem_cache *cache, void *object)
+void __kasan_poison_object_data(struct kmem_cache *cache, void *object)
{
poison_range(object,
round_up(cache->object_size, KASAN_GRANULE_SIZE),
@@ -264,7 +264,7 @@ static u8 assign_tag(struct kmem_cache *cache, const void *object,
#endif
}
-void * __must_check kasan_init_slab_obj(struct kmem_cache *cache,
+void * __must_check __kasan_init_slab_obj(struct kmem_cache *cache,
const void *object)
{
struct kasan_alloc_meta *alloc_meta;
@@ -283,7 +283,7 @@ void * __must_check kasan_init_slab_obj(struct kmem_cache *cache,
return (void *)object;
}
-static bool __kasan_slab_free(struct kmem_cache *cache, void *object,
+static bool ____kasan_slab_free(struct kmem_cache *cache, void *object,
unsigned long ip, bool quarantine)
{
u8 tag;
@@ -326,9 +326,9 @@ static bool __kasan_slab_free(struct kmem_cache *cache, void *object,
return IS_ENABLED(CONFIG_KASAN_GENERIC);
}
-bool kasan_slab_free(struct kmem_cache *cache, void *object, unsigned long ip)
+bool __kasan_slab_free(struct kmem_cache *cache, void *object, unsigned long ip)
{
- return __kasan_slab_free(cache, object, ip, true);
+ return ____kasan_slab_free(cache, object, ip, true);
}
static void set_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags)
@@ -336,7 +336,7 @@ static void set_alloc_info(struct kmem_cache *cache, void *object, gfp_t flags)
kasan_set_track(&kasan_get_alloc_meta(cache, object)->alloc_track, flags);
}
-static void *__kasan_kmalloc(struct kmem_cache *cache, const void *object,
+static void *____kasan_kmalloc(struct kmem_cache *cache, const void *object,
size_t size, gfp_t flags, bool keep_tag)
{
unsigned long redzone_start;
@@ -368,20 +368,20 @@ static void *__kasan_kmalloc(struct kmem_cache *cache, const void *object,
return set_tag(object, tag);
}
-void * __must_check kasan_slab_alloc(struct kmem_cache *cache, void *object,
- gfp_t flags)
+void * __must_check __kasan_slab_alloc(struct kmem_cache *cache,
+ void *object, gfp_t flags)
{
- return __kasan_kmalloc(cache, object, cache->object_size, flags, false);
+ return ____kasan_kmalloc(cache, object, cache->object_size, flags, false);
}
-void * __must_check kasan_kmalloc(struct kmem_cache *cache, const void *object,
- size_t size, gfp_t flags)
+void * __must_check __kasan_kmalloc(struct kmem_cache *cache, const void *object,
+ size_t size, gfp_t flags)
{
- return __kasan_kmalloc(cache, object, size, flags, true);
+ return ____kasan_kmalloc(cache, object, size, flags, true);
}
-EXPORT_SYMBOL(kasan_kmalloc);
+EXPORT_SYMBOL(__kasan_kmalloc);
-void * __must_check kasan_kmalloc_large(const void *ptr, size_t size,
+void * __must_check __kasan_kmalloc_large(const void *ptr, size_t size,
gfp_t flags)
{
struct page *page;
@@ -406,7 +406,7 @@ void * __must_check kasan_kmalloc_large(const void *ptr, size_t size,
return (void *)ptr;
}
-void * __must_check kasan_krealloc(const void *object, size_t size, gfp_t flags)
+void * __must_check __kasan_krealloc(const void *object, size_t size, gfp_t flags)
{
struct page *page;
@@ -416,13 +416,13 @@ void * __must_check kasan_krealloc(const void *object, size_t size, gfp_t flags)
page = virt_to_head_page(object);
if (unlikely(!PageSlab(page)))
- return kasan_kmalloc_large(object, size, flags);
+ return __kasan_kmalloc_large(object, size, flags);
else
- return __kasan_kmalloc(page->slab_cache, object, size,
+ return ____kasan_kmalloc(page->slab_cache, object, size,
flags, true);
}
-void kasan_poison_kfree(void *ptr, unsigned long ip)
+void __kasan_poison_kfree(void *ptr, unsigned long ip)
{
struct page *page;
@@ -435,11 +435,11 @@ void kasan_poison_kfree(void *ptr, unsigned long ip)
}
poison_range(ptr, page_size(page), KASAN_FREE_PAGE);
} else {
- __kasan_slab_free(page->slab_cache, ptr, ip, false);
+ ____kasan_slab_free(page->slab_cache, ptr, ip, false);
}
}
-void kasan_kfree_large(void *ptr, unsigned long ip)
+void __kasan_kfree_large(void *ptr, unsigned long ip)
{
if (ptr != page_address(virt_to_head_page(ptr)))
kasan_report_invalid_free(ptr, ip);