diff options
Diffstat (limited to 'mm/kasan/sw_tags.c')
| -rw-r--r-- | mm/kasan/sw_tags.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/mm/kasan/sw_tags.c b/mm/kasan/sw_tags.c index c0b3f327812b..64540109c461 100644 --- a/mm/kasan/sw_tags.c +++ b/mm/kasan/sw_tags.c @@ -121,6 +121,15 @@ bool check_memory_region(unsigned long addr, size_t size, bool write, return true; } +bool check_invalid_free(void *addr) +{ + u8 tag = get_tag(addr); + u8 shadow_byte = READ_ONCE(*(u8 *)kasan_mem_to_shadow(reset_tag(addr))); + + return (shadow_byte == KASAN_TAG_INVALID) || + (tag != KASAN_TAG_KERNEL && tag != shadow_byte); +} + #define DEFINE_HWASAN_LOAD_STORE(size) \ void __hwasan_load##size##_noabort(unsigned long addr) \ { \ |