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| author | Qing Zhang <zhangqing@loongson.cn> | 2023-09-06 22:54:16 +0800 |
|---|---|---|
| committer | Huacai Chen <chenhuacai@loongson.cn> | 2023-09-06 22:54:16 +0800 |
| commit | 9b04c764af18a1dab6d48ca0671f70cdcccf90a2 (patch) | |
| tree | b115d52dee1d22bc3dc54a8de8686da97557509c /mm/kasan/kasan.h | |
| parent | 6ad3df56bb199134800933df2afcd7df3b03ef33 (diff) | |
| download | lwn-9b04c764af18a1dab6d48ca0671f70cdcccf90a2.tar.gz lwn-9b04c764af18a1dab6d48ca0671f70cdcccf90a2.zip | |
kasan: Add __HAVE_ARCH_SHADOW_MAP to support arch specific mapping
MIPS, LoongArch and some other architectures have many holes between
different segments and the valid address space (256T available) is
insufficient to map all these segments to kasan shadow memory with the
common formula provided by kasan core. So we need architecture specific
mapping formulas to ensure different segments are mapped individually,
and only limited space lengths of those specific segments are mapped to
shadow.
Therefore, when the incoming address is converted to a shadow, we need
to add a condition to determine whether it is valid.
Reviewed-by: Andrey Konovalov <andreyknvl@gmail.com>
Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
Diffstat (limited to 'mm/kasan/kasan.h')
| -rw-r--r-- | mm/kasan/kasan.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/mm/kasan/kasan.h b/mm/kasan/kasan.h index 2e973b36fe07..f70e3d7a602e 100644 --- a/mm/kasan/kasan.h +++ b/mm/kasan/kasan.h @@ -291,16 +291,22 @@ struct kasan_stack_ring { #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS) +#ifndef __HAVE_ARCH_SHADOW_MAP static inline const void *kasan_shadow_to_mem(const void *shadow_addr) { return (void *)(((unsigned long)shadow_addr - KASAN_SHADOW_OFFSET) << KASAN_SHADOW_SCALE_SHIFT); } +#endif static __always_inline bool addr_has_metadata(const void *addr) { +#ifdef __HAVE_ARCH_SHADOW_MAP + return (kasan_mem_to_shadow((void *)addr) != NULL); +#else return (kasan_reset_tag(addr) >= kasan_shadow_to_mem((void *)KASAN_SHADOW_START)); +#endif } /** |