diff options
Diffstat (limited to 'mm/kasan/kasan.h')
-rw-r--r-- | mm/kasan/kasan.h | 43 |
1 files changed, 41 insertions, 2 deletions
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h index fb883740fd27..222858e2e6af 100644 --- a/mm/kasan/kasan.h +++ b/mm/kasan/kasan.h @@ -367,12 +367,51 @@ static inline bool kasan_byte_accessible(const void *addr) #else /* CONFIG_KASAN_HW_TAGS */ -void kasan_poison(const void *address, size_t size, u8 value); -void kasan_unpoison(const void *address, size_t size); +/** + * kasan_poison - mark the memory range as unaccessible + * @addr - range start address, must be aligned to KASAN_GRANULE_SIZE + * @size - range size + * @value - value that's written to metadata for the range + * + * The size gets aligned to KASAN_GRANULE_SIZE before marking the range. + */ +void kasan_poison(const void *addr, size_t size, u8 value); + +/** + * kasan_unpoison - mark the memory range as accessible + * @addr - range start address, must be aligned to KASAN_GRANULE_SIZE + * @size - range size + * + * For the tag-based modes, the @size gets aligned to KASAN_GRANULE_SIZE before + * marking the range. + * For the generic mode, the last granule of the memory range gets partially + * unpoisoned based on the @size. + */ +void kasan_unpoison(const void *addr, size_t size); + bool kasan_byte_accessible(const void *addr); #endif /* CONFIG_KASAN_HW_TAGS */ +#ifdef CONFIG_KASAN_GENERIC + +/** + * kasan_poison_last_granule - mark the last granule of the memory range as + * unaccessible + * @addr - range start address, must be aligned to KASAN_GRANULE_SIZE + * @size - range size + * + * This function is only available for the generic mode, as it's the only mode + * that has partially poisoned memory granules. + */ +void kasan_poison_last_granule(const void *address, size_t size); + +#else /* CONFIG_KASAN_GENERIC */ + +static inline void kasan_poison_last_granule(const void *address, size_t size) { } + +#endif /* CONFIG_KASAN_GENERIC */ + /* * Exported functions for interfaces called from assembly or from generated * code. Declarations here to avoid warning about missing declarations. |