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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>
This commit is contained in:
Andrey Konovalov
Linus Torvalds
parent
8028caaca7
commit
34303244f2
3 changed files with 212 additions and 83 deletions
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@ -2,6 +2,7 @@
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#ifndef _LINUX_KASAN_H
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#define _LINUX_KASAN_H
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#include <linux/static_key.h>
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#include <linux/types.h>
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struct kmem_cache;
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@ -75,54 +76,176 @@ static inline void kasan_disable_current(void) {}
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#ifdef CONFIG_KASAN
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void kasan_unpoison_range(const void *address, size_t size);
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void kasan_alloc_pages(struct page *page, unsigned int order);
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void kasan_free_pages(struct page *page, unsigned int order);
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void kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
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slab_flags_t *flags);
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void kasan_poison_slab(struct page *page);
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void kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
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void kasan_poison_object_data(struct kmem_cache *cache, void *object);
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void * __must_check kasan_init_slab_obj(struct kmem_cache *cache,
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const void *object);
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void * __must_check kasan_kmalloc_large(const void *ptr, size_t size,
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gfp_t flags);
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void kasan_kfree_large(void *ptr, unsigned long ip);
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void kasan_poison_kfree(void *ptr, unsigned long ip);
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void * __must_check kasan_kmalloc(struct kmem_cache *s, const void *object,
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size_t size, gfp_t flags);
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void * __must_check kasan_krealloc(const void *object, size_t new_size,
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gfp_t flags);
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void * __must_check kasan_slab_alloc(struct kmem_cache *s, void *object,
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gfp_t flags);
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bool kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip);
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struct kasan_cache {
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int alloc_meta_offset;
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int free_meta_offset;
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};
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size_t kasan_metadata_size(struct kmem_cache *cache);
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#ifdef CONFIG_KASAN_HW_TAGS
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DECLARE_STATIC_KEY_FALSE(kasan_flag_enabled);
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static __always_inline bool kasan_enabled(void)
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{
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return static_branch_likely(&kasan_flag_enabled);
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}
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#else
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static inline bool kasan_enabled(void)
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{
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return true;
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}
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#endif
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void __kasan_unpoison_range(const void *addr, size_t size);
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static __always_inline void kasan_unpoison_range(const void *addr, size_t size)
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{
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if (kasan_enabled())
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__kasan_unpoison_range(addr, size);
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}
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void __kasan_alloc_pages(struct page *page, unsigned int order);
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static __always_inline void kasan_alloc_pages(struct page *page,
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unsigned int order)
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{
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if (kasan_enabled())
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__kasan_alloc_pages(page, order);
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}
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void __kasan_free_pages(struct page *page, unsigned int order);
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static __always_inline void kasan_free_pages(struct page *page,
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unsigned int order)
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{
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if (kasan_enabled())
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__kasan_free_pages(page, order);
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}
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void __kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
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slab_flags_t *flags);
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static __always_inline void kasan_cache_create(struct kmem_cache *cache,
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unsigned int *size, slab_flags_t *flags)
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{
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if (kasan_enabled())
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__kasan_cache_create(cache, size, flags);
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}
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size_t __kasan_metadata_size(struct kmem_cache *cache);
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static __always_inline size_t kasan_metadata_size(struct kmem_cache *cache)
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{
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if (kasan_enabled())
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return __kasan_metadata_size(cache);
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return 0;
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}
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void __kasan_poison_slab(struct page *page);
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static __always_inline void kasan_poison_slab(struct page *page)
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{
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if (kasan_enabled())
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__kasan_poison_slab(page);
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}
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void __kasan_unpoison_object_data(struct kmem_cache *cache, void *object);
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static __always_inline void kasan_unpoison_object_data(struct kmem_cache *cache,
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void *object)
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{
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if (kasan_enabled())
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__kasan_unpoison_object_data(cache, object);
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}
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void __kasan_poison_object_data(struct kmem_cache *cache, void *object);
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static __always_inline void kasan_poison_object_data(struct kmem_cache *cache,
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void *object)
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{
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if (kasan_enabled())
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__kasan_poison_object_data(cache, object);
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}
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void * __must_check __kasan_init_slab_obj(struct kmem_cache *cache,
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const void *object);
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static __always_inline void * __must_check kasan_init_slab_obj(
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struct kmem_cache *cache, const void *object)
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{
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if (kasan_enabled())
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return __kasan_init_slab_obj(cache, object);
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return (void *)object;
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}
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bool __kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip);
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static __always_inline bool kasan_slab_free(struct kmem_cache *s, void *object,
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unsigned long ip)
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{
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if (kasan_enabled())
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return __kasan_slab_free(s, object, ip);
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return false;
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}
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void * __must_check __kasan_slab_alloc(struct kmem_cache *s,
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void *object, gfp_t flags);
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static __always_inline void * __must_check kasan_slab_alloc(
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struct kmem_cache *s, void *object, gfp_t flags)
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{
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if (kasan_enabled())
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return __kasan_slab_alloc(s, object, flags);
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return object;
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}
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void * __must_check __kasan_kmalloc(struct kmem_cache *s, const void *object,
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size_t size, gfp_t flags);
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static __always_inline void * __must_check kasan_kmalloc(struct kmem_cache *s,
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const void *object, size_t size, gfp_t flags)
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{
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if (kasan_enabled())
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return __kasan_kmalloc(s, object, size, flags);
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return (void *)object;
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}
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void * __must_check __kasan_kmalloc_large(const void *ptr,
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size_t size, gfp_t flags);
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static __always_inline void * __must_check kasan_kmalloc_large(const void *ptr,
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size_t size, gfp_t flags)
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{
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if (kasan_enabled())
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return __kasan_kmalloc_large(ptr, size, flags);
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return (void *)ptr;
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}
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void * __must_check __kasan_krealloc(const void *object,
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size_t new_size, gfp_t flags);
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static __always_inline void * __must_check kasan_krealloc(const void *object,
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size_t new_size, gfp_t flags)
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{
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if (kasan_enabled())
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return __kasan_krealloc(object, new_size, flags);
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return (void *)object;
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}
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void __kasan_poison_kfree(void *ptr, unsigned long ip);
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static __always_inline void kasan_poison_kfree(void *ptr, unsigned long ip)
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{
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if (kasan_enabled())
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__kasan_poison_kfree(ptr, ip);
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}
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void __kasan_kfree_large(void *ptr, unsigned long ip);
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static __always_inline void kasan_kfree_large(void *ptr, unsigned long ip)
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{
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if (kasan_enabled())
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__kasan_kfree_large(ptr, ip);
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}
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bool kasan_save_enable_multi_shot(void);
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void kasan_restore_multi_shot(bool enabled);
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#else /* CONFIG_KASAN */
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static inline bool kasan_enabled(void)
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{
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return false;
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}
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static inline void kasan_unpoison_range(const void *address, size_t size) {}
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static inline void kasan_alloc_pages(struct page *page, unsigned int order) {}
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static inline void kasan_free_pages(struct page *page, unsigned int order) {}
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static inline void kasan_cache_create(struct kmem_cache *cache,
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unsigned int *size,
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slab_flags_t *flags) {}
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static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
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static inline void kasan_poison_slab(struct page *page) {}
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static inline void kasan_unpoison_object_data(struct kmem_cache *cache,
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void *object) {}
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@ -133,36 +256,32 @@ static inline void *kasan_init_slab_obj(struct kmem_cache *cache,
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{
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return (void *)object;
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}
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static inline void *kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags)
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static inline bool kasan_slab_free(struct kmem_cache *s, void *object,
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unsigned long ip)
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{
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return ptr;
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return false;
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}
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static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object,
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gfp_t flags)
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{
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return object;
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}
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static inline void kasan_kfree_large(void *ptr, unsigned long ip) {}
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static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {}
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static inline void *kasan_kmalloc(struct kmem_cache *s, const void *object,
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size_t size, gfp_t flags)
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{
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return (void *)object;
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}
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static inline void *kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags)
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{
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return (void *)ptr;
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}
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static inline void *kasan_krealloc(const void *object, size_t new_size,
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gfp_t flags)
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{
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return (void *)object;
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}
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static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object,
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gfp_t flags)
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{
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return object;
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}
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static inline bool kasan_slab_free(struct kmem_cache *s, void *object,
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unsigned long ip)
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{
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return false;
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}
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static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; }
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static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {}
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static inline void kasan_kfree_large(void *ptr, unsigned long ip) {}
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#endif /* CONFIG_KASAN */
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@ -31,6 +31,7 @@
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#include <linux/sizes.h>
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#include <linux/sched.h>
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#include <linux/pgtable.h>
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#include <linux/kasan.h>
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struct mempolicy;
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struct anon_vma;
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@ -1422,22 +1423,30 @@ static inline bool cpupid_match_pid(struct task_struct *task, int cpupid)
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#endif /* CONFIG_NUMA_BALANCING */
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#if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
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static inline u8 page_kasan_tag(const struct page *page)
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{
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return (page->flags >> KASAN_TAG_PGSHIFT) & KASAN_TAG_MASK;
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if (kasan_enabled())
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return (page->flags >> KASAN_TAG_PGSHIFT) & KASAN_TAG_MASK;
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return 0xff;
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}
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static inline void page_kasan_tag_set(struct page *page, u8 tag)
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{
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page->flags &= ~(KASAN_TAG_MASK << KASAN_TAG_PGSHIFT);
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page->flags |= (tag & KASAN_TAG_MASK) << KASAN_TAG_PGSHIFT;
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if (kasan_enabled()) {
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page->flags &= ~(KASAN_TAG_MASK << KASAN_TAG_PGSHIFT);
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page->flags |= (tag & KASAN_TAG_MASK) << KASAN_TAG_PGSHIFT;
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}
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}
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static inline void page_kasan_tag_reset(struct page *page)
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{
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page_kasan_tag_set(page, 0xff);
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if (kasan_enabled())
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page_kasan_tag_set(page, 0xff);
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}
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#else
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#else /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */
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static inline u8 page_kasan_tag(const struct page *page)
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{
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return 0xff;
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@ -1445,7 +1454,8 @@ static inline u8 page_kasan_tag(const struct page *page)
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static inline void page_kasan_tag_set(struct page *page, u8 tag) { }
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static inline void page_kasan_tag_reset(struct page *page) { }
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#endif
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#endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */
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static inline struct zone *page_zone(const struct page *page)
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{
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@ -58,7 +58,7 @@ void kasan_disable_current(void)
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}
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#endif /* CONFIG_KASAN_GENERIC || CONFIG_KASAN_SW_TAGS */
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void kasan_unpoison_range(const void *address, size_t size)
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void __kasan_unpoison_range(const void *address, size_t size)
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{
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unpoison_range(address, size);
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}
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@ -86,7 +86,7 @@ asmlinkage void kasan_unpoison_task_stack_below(const void *watermark)
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}
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#endif /* CONFIG_KASAN_STACK */
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void kasan_alloc_pages(struct page *page, unsigned int order)
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void __kasan_alloc_pages(struct page *page, unsigned int order)
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{
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u8 tag;
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unsigned long i;
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@ -100,7 +100,7 @@ void kasan_alloc_pages(struct page *page, unsigned int order)
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unpoison_range(page_address(page), PAGE_SIZE << order);
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}
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void kasan_free_pages(struct page *page, unsigned int order)
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void __kasan_free_pages(struct page *page, unsigned int order)
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{
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if (likely(!PageHighMem(page)))
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poison_range(page_address(page),
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@ -127,8 +127,8 @@ static inline unsigned int optimal_redzone(unsigned int object_size)
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object_size <= (1 << 16) - 1024 ? 1024 : 2048;
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}
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void kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
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slab_flags_t *flags)
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void __kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
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slab_flags_t *flags)
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{
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unsigned int orig_size = *size;
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unsigned int redzone_size;
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@ -173,7 +173,7 @@ void kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
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*flags |= SLAB_KASAN;
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}
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size_t kasan_metadata_size(struct kmem_cache *cache)
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size_t __kasan_metadata_size(struct kmem_cache *cache)
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{
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if (!kasan_stack_collection_enabled())
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return 0;
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@ -196,7 +196,7 @@ struct kasan_free_meta *kasan_get_free_meta(struct kmem_cache *cache,
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return kasan_reset_tag(object) + cache->kasan_info.free_meta_offset;
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}
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void kasan_poison_slab(struct page *page)
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void __kasan_poison_slab(struct page *page)
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{
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unsigned long i;
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@ -206,12 +206,12 @@ void kasan_poison_slab(struct page *page)
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KASAN_KMALLOC_REDZONE);
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}
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void kasan_unpoison_object_data(struct kmem_cache *cache, void *object)
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void __kasan_unpoison_object_data(struct kmem_cache *cache, void *object)
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{
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unpoison_range(object, cache->object_size);
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}
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void kasan_poison_object_data(struct kmem_cache *cache, void *object)
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void __kasan_poison_object_data(struct kmem_cache *cache, void *object)
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{
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poison_range(object,
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round_up(cache->object_size, KASAN_GRANULE_SIZE),
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@ -264,7 +264,7 @@ static u8 assign_tag(struct kmem_cache *cache, const void *object,
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#endif
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}
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void * __must_check kasan_init_slab_obj(struct kmem_cache *cache,
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void * __must_check __kasan_init_slab_obj(struct kmem_cache *cache,
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const void *object)
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{
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struct kasan_alloc_meta *alloc_meta;
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@ -283,7 +283,7 @@ void * __must_check kasan_init_slab_obj(struct kmem_cache *cache,
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return (void *)object;
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}
|
||||
|
||||
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);
|
||||
|
|
|
|||
Loading…
Reference in a new issue