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authorQing Zhang <zhangqing@loongson.cn>2023-09-06 22:54:16 +0800
committerHuacai Chen <chenhuacai@loongson.cn>2023-09-06 22:54:16 +0800
commit9b04c764af18a1dab6d48ca0671f70cdcccf90a2 (patch)
treeb115d52dee1d22bc3dc54a8de8686da97557509c /include
parent6ad3df56bb199134800933df2afcd7df3b03ef33 (diff)
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 'include')
-rw-r--r--include/linux/kasan.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/kasan.h b/include/linux/kasan.h
index 819b6bc8ac08..3df5499f7936 100644
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -54,11 +54,13 @@ extern p4d_t kasan_early_shadow_p4d[MAX_PTRS_PER_P4D];
int kasan_populate_early_shadow(const void *shadow_start,
const void *shadow_end);
+#ifndef __HAVE_ARCH_SHADOW_MAP
static inline void *kasan_mem_to_shadow(const void *addr)
{
return (void *)((unsigned long)addr >> KASAN_SHADOW_SCALE_SHIFT)
+ KASAN_SHADOW_OFFSET;
}
+#endif
int kasan_add_zero_shadow(void *start, unsigned long size);
void kasan_remove_zero_shadow(void *start, unsigned long size);