diff options
author | Andrey Konovalov <andreyknvl@google.com> | 2020-12-22 12:03:10 -0800 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-12-22 12:55:09 -0800 |
commit | 34303244f2615add92076a4bf2d4f39323bde4f2 (patch) | |
tree | 0507232078dd68ce704ff6a71fc1770fad6c9af8 /include | |
parent | 8028caaca7a8107a52bb28fd92dea35bebd7ae8e (diff) | |
download | linux-stable-34303244f2615add92076a4bf2d4f39323bde4f2.tar.gz linux-stable-34303244f2615add92076a4bf2d4f39323bde4f2.tar.bz2 linux-stable-34303244f2615add92076a4bf2d4f39323bde4f2.zip |
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 'include')
-rw-r--r-- | include/linux/kasan.h | 213 | ||||
-rw-r--r-- | include/linux/mm.h | 22 |
2 files changed, 182 insertions, 53 deletions
diff --git a/include/linux/kasan.h b/include/linux/kasan.h index 7350de3e9fe4..9176849c4934 100644 --- a/include/linux/kasan.h +++ b/include/linux/kasan.h @@ -2,6 +2,7 @@ #ifndef _LINUX_KASAN_H #define _LINUX_KASAN_H +#include <linux/static_key.h> #include <linux/types.h> struct kmem_cache; @@ -75,54 +76,176 @@ static inline void kasan_disable_current(void) {} #ifdef CONFIG_KASAN -void kasan_unpoison_range(const void *address, size_t size); +struct kasan_cache { + int alloc_meta_offset; + int free_meta_offset; +}; -void kasan_alloc_pages(struct page *page, unsigned int order); -void kasan_free_pages(struct page *page, unsigned int order); +#ifdef CONFIG_KASAN_HW_TAGS +DECLARE_STATIC_KEY_FALSE(kasan_flag_enabled); +static __always_inline bool kasan_enabled(void) +{ + return static_branch_likely(&kasan_flag_enabled); +} +#else +static inline bool kasan_enabled(void) +{ + return true; +} +#endif -void kasan_cache_create(struct kmem_cache *cache, unsigned int *size, - slab_flags_t *flags); +void __kasan_unpoison_range(const void *addr, size_t size); +static __always_inline void kasan_unpoison_range(const void *addr, size_t size) +{ + if (kasan_enabled()) + __kasan_unpoison_range(addr, size); +} -void kasan_poison_slab(struct page *page); -void kasan_unpoison_object_data(struct kmem_cache *cache, void *object); -void kasan_poison_object_data(struct kmem_cache *cache, void *object); -void * __must_check kasan_init_slab_obj(struct kmem_cache *cache, - const void *object); +void __kasan_alloc_pages(struct page *page, unsigned int order); +static __always_inline void kasan_alloc_pages(struct page *page, + unsigned int order) +{ + if (kasan_enabled()) + __kasan_alloc_pages(page, order); +} -void * __must_check kasan_kmalloc_large(const void *ptr, size_t size, - gfp_t flags); -void kasan_kfree_large(void *ptr, unsigned long ip); -void kasan_poison_kfree(void *ptr, unsigned long ip); -void * __must_check kasan_kmalloc(struct kmem_cache *s, const void *object, - size_t size, gfp_t flags); -void * __must_check kasan_krealloc(const void *object, size_t new_size, - gfp_t flags); +void __kasan_free_pages(struct page *page, unsigned int order); +static __always_inline void kasan_free_pages(struct page *page, + unsigned int order) +{ + if (kasan_enabled()) + __kasan_free_pages(page, order); +} -void * __must_check kasan_slab_alloc(struct kmem_cache *s, void *object, - gfp_t flags); -bool kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip); +void __kasan_cache_create(struct kmem_cache *cache, unsigned int *size, + slab_flags_t *flags); +static __always_inline void kasan_cache_create(struct kmem_cache *cache, + unsigned int *size, slab_flags_t *flags) +{ + if (kasan_enabled()) + __kasan_cache_create(cache, size, flags); +} -struct kasan_cache { - int alloc_meta_offset; - int free_meta_offset; -}; +size_t __kasan_metadata_size(struct kmem_cache *cache); +static __always_inline size_t kasan_metadata_size(struct kmem_cache *cache) +{ + if (kasan_enabled()) + return __kasan_metadata_size(cache); + return 0; +} + +void __kasan_poison_slab(struct page *page); +static __always_inline void kasan_poison_slab(struct page *page) +{ + if (kasan_enabled()) + __kasan_poison_slab(page); +} + +void __kasan_unpoison_object_data(struct kmem_cache *cache, void *object); +static __always_inline void kasan_unpoison_object_data(struct kmem_cache *cache, + void *object) +{ + if (kasan_enabled()) + __kasan_unpoison_object_data(cache, object); +} + +void __kasan_poison_object_data(struct kmem_cache *cache, void *object); +static __always_inline void kasan_poison_object_data(struct kmem_cache *cache, + void *object) +{ + if (kasan_enabled()) + __kasan_poison_object_data(cache, object); +} + +void * __must_check __kasan_init_slab_obj(struct kmem_cache *cache, + const void *object); +static __always_inline void * __must_check kasan_init_slab_obj( + struct kmem_cache *cache, const void *object) +{ + if (kasan_enabled()) + return __kasan_init_slab_obj(cache, object); + return (void *)object; +} + +bool __kasan_slab_free(struct kmem_cache *s, void *object, unsigned long ip); +static __always_inline bool kasan_slab_free(struct kmem_cache *s, void *object, + unsigned long ip) +{ + if (kasan_enabled()) + return __kasan_slab_free(s, object, ip); + return false; +} + +void * __must_check __kasan_slab_alloc(struct kmem_cache *s, + void *object, gfp_t flags); +static __always_inline void * __must_check kasan_slab_alloc( + struct kmem_cache *s, void *object, gfp_t flags) +{ + if (kasan_enabled()) + return __kasan_slab_alloc(s, object, flags); + return object; +} + +void * __must_check __kasan_kmalloc(struct kmem_cache *s, const void *object, + size_t size, gfp_t flags); +static __always_inline void * __must_check kasan_kmalloc(struct kmem_cache *s, + const void *object, size_t size, gfp_t flags) +{ + if (kasan_enabled()) + return __kasan_kmalloc(s, object, size, flags); + return (void *)object; +} -size_t kasan_metadata_size(struct kmem_cache *cache); +void * __must_check __kasan_kmalloc_large(const void *ptr, + size_t size, gfp_t flags); +static __always_inline void * __must_check kasan_kmalloc_large(const void *ptr, + size_t size, gfp_t flags) +{ + if (kasan_enabled()) + return __kasan_kmalloc_large(ptr, size, flags); + return (void *)ptr; +} + +void * __must_check __kasan_krealloc(const void *object, + size_t new_size, gfp_t flags); +static __always_inline void * __must_check kasan_krealloc(const void *object, + size_t new_size, gfp_t flags) +{ + if (kasan_enabled()) + return __kasan_krealloc(object, new_size, flags); + return (void *)object; +} + +void __kasan_poison_kfree(void *ptr, unsigned long ip); +static __always_inline void kasan_poison_kfree(void *ptr, unsigned long ip) +{ + if (kasan_enabled()) + __kasan_poison_kfree(ptr, ip); +} + +void __kasan_kfree_large(void *ptr, unsigned long ip); +static __always_inline void kasan_kfree_large(void *ptr, unsigned long ip) +{ + if (kasan_enabled()) + __kasan_kfree_large(ptr, ip); +} bool kasan_save_enable_multi_shot(void); void kasan_restore_multi_shot(bool enabled); #else /* CONFIG_KASAN */ +static inline bool kasan_enabled(void) +{ + return false; +} static inline void kasan_unpoison_range(const void *address, size_t size) {} - static inline void kasan_alloc_pages(struct page *page, unsigned int order) {} static inline void kasan_free_pages(struct page *page, unsigned int order) {} - static inline void kasan_cache_create(struct kmem_cache *cache, unsigned int *size, slab_flags_t *flags) {} - +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_unpoison_object_data(struct kmem_cache *cache, void *object) {} @@ -133,36 +256,32 @@ static inline void *kasan_init_slab_obj(struct kmem_cache *cache, { return (void *)object; } - -static inline void *kasan_kmalloc_large(void *ptr, size_t size, gfp_t flags) +static inline bool kasan_slab_free(struct kmem_cache *s, void *object, + unsigned long ip) { - return ptr; + return false; +} +static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object, + gfp_t flags) +{ + return object; } -static inline void kasan_kfree_large(void *ptr, unsigned long ip) {} -static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {} static inline void *kasan_kmalloc(struct kmem_cache *s, const void *object, size_t size, gfp_t flags) { return (void *)object; } +static inline void *kasan_kmalloc_large(const void *ptr, size_t size, gfp_t flags) +{ + return (void *)ptr; +} static inline void *kasan_krealloc(const void *object, size_t new_size, gfp_t flags) { return (void *)object; } - -static inline void *kasan_slab_alloc(struct kmem_cache *s, void *object, - gfp_t flags) -{ - return object; -} -static inline bool kasan_slab_free(struct kmem_cache *s, void *object, - unsigned long ip) -{ - return false; -} - -static inline size_t kasan_metadata_size(struct kmem_cache *cache) { return 0; } +static inline void kasan_poison_kfree(void *ptr, unsigned long ip) {} +static inline void kasan_kfree_large(void *ptr, unsigned long ip) {} #endif /* CONFIG_KASAN */ diff --git a/include/linux/mm.h b/include/linux/mm.h index 024ec0a00c72..5299b90a6c40 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -31,6 +31,7 @@ #include <linux/sizes.h> #include <linux/sched.h> #include <linux/pgtable.h> +#include <linux/kasan.h> struct mempolicy; struct anon_vma; @@ -1422,22 +1423,30 @@ static inline bool cpupid_match_pid(struct task_struct *task, int cpupid) #endif /* CONFIG_NUMA_BALANCING */ #if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS) + static inline u8 page_kasan_tag(const struct page *page) { - return (page->flags >> KASAN_TAG_PGSHIFT) & KASAN_TAG_MASK; + if (kasan_enabled()) + return (page->flags >> KASAN_TAG_PGSHIFT) & KASAN_TAG_MASK; + return 0xff; } static inline void page_kasan_tag_set(struct page *page, u8 tag) { - page->flags &= ~(KASAN_TAG_MASK << KASAN_TAG_PGSHIFT); - page->flags |= (tag & KASAN_TAG_MASK) << KASAN_TAG_PGSHIFT; + if (kasan_enabled()) { + page->flags &= ~(KASAN_TAG_MASK << KASAN_TAG_PGSHIFT); + page->flags |= (tag & KASAN_TAG_MASK) << KASAN_TAG_PGSHIFT; + } } static inline void page_kasan_tag_reset(struct page *page) { - page_kasan_tag_set(page, 0xff); + if (kasan_enabled()) + page_kasan_tag_set(page, 0xff); } -#else + +#else /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ + static inline u8 page_kasan_tag(const struct page *page) { return 0xff; @@ -1445,7 +1454,8 @@ static inline u8 page_kasan_tag(const struct page *page) static inline void page_kasan_tag_set(struct page *page, u8 tag) { } static inline void page_kasan_tag_reset(struct page *page) { } -#endif + +#endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */ static inline struct zone *page_zone(const struct page *page) { |