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kasan: inline (un)poison_range and check_invalid_free 

Using (un)poison_range() or check_invalid_free() currently results in
function calls. Move their definitions to mm/kasan/kasan.h and turn them
into static inline functions for hardware tag-based mode to avoid
unneeded function calls.

Link: https://lkml.kernel.org/r/7007955b69eb31b5376a7dc1e0f4ac49138504f2.1606162397.git.andreyknvl@google.com
Link: https://linux-review.googlesource.com/id/Ia9d8191024a12d1374675b3d27197f10193f50bb
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Marco Elver <elver@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: Dmitry Vyukov <dvyukov@google.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 2020-12-22 12:03:03 -08:00 committed by Linus Torvalds
parent bffe690708
commit 57345fa68a
2 changed files with 31 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
mm/kasan/hw_tags.c
View File

@ -30,27 +30,6 @@ void __init kasan_init_hw_tags(void)
pr_info("KernelAddressSanitizer initialized\n");
}
void poison_range(const void *address, size_t size, u8 value)
{
hw_set_mem_tag_range(kasan_reset_tag(address),
round_up(size, KASAN_GRANULE_SIZE), value);
}
void unpoison_range(const void *address, size_t size)
{
hw_set_mem_tag_range(kasan_reset_tag(address),
round_up(size, KASAN_GRANULE_SIZE), get_tag(address));
}
bool check_invalid_free(void *addr)
{
u8 ptr_tag = get_tag(addr);
u8 mem_tag = hw_get_mem_tag(addr);
return (mem_tag == KASAN_TAG_INVALID) ||
(ptr_tag != KASAN_TAG_KERNEL && ptr_tag != mem_tag);
}
void kasan_set_free_info(struct kmem_cache *cache,
void *object, u8 tag)
{

36
mm/kasan/kasan.h
View File

@ -154,9 +154,6 @@ struct kasan_alloc_meta *kasan_get_alloc_meta(struct kmem_cache *cache,
struct kasan_free_meta *kasan_get_free_meta(struct kmem_cache *cache,
const void *object);
void poison_range(const void *address, size_t size, u8 value);
void unpoison_range(const void *address, size_t size);
#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
static inline const void *kasan_shadow_to_mem(const void *shadow_addr)
@ -196,8 +193,6 @@ void print_tags(u8 addr_tag, const void *addr);
static inline void print_tags(u8 addr_tag, const void *addr) { }
#endif
bool check_invalid_free(void *addr);
void *find_first_bad_addr(void *addr, size_t size);
const char *get_bug_type(struct kasan_access_info *info);
void metadata_fetch_row(char *buffer, void *row);
@ -278,6 +273,37 @@ static inline u8 random_tag(void) { return hw_get_random_tag(); }
static inline u8 random_tag(void) { return 0; }
#endif
#ifdef CONFIG_KASAN_HW_TAGS
static inline void poison_range(const void *address, size_t size, u8 value)
{
hw_set_mem_tag_range(kasan_reset_tag(address),
round_up(size, KASAN_GRANULE_SIZE), value);
}
static inline void unpoison_range(const void *address, size_t size)
{
hw_set_mem_tag_range(kasan_reset_tag(address),
round_up(size, KASAN_GRANULE_SIZE), get_tag(address));
}
static inline bool check_invalid_free(void *addr)
{
u8 ptr_tag = get_tag(addr);
u8 mem_tag = hw_get_mem_tag(addr);
return (mem_tag == KASAN_TAG_INVALID) ||
(ptr_tag != KASAN_TAG_KERNEL && ptr_tag != mem_tag);
}
#else /* CONFIG_KASAN_HW_TAGS */
void poison_range(const void *address, size_t size, u8 value);
void unpoison_range(const void *address, size_t size);
bool check_invalid_free(void *addr);
#endif /* CONFIG_KASAN_HW_TAGS */
/*
* Exported functions for interfaces called from assembly or from generated
* code. Declarations here to avoid warning about missing declarations.