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authorQing Zhang <zhangqing@loongson.cn>2023-09-06 17:54:16 +0300
committerHuacai Chen <chenhuacai@loongson.cn>2023-09-06 17:54:16 +0300
commit9b04c764af18a1dab6d48ca0671f70cdcccf90a2 (patch)
treeb115d52dee1d22bc3dc54a8de8686da97557509c /mm
parent6ad3df56bb199134800933df2afcd7df3b03ef33 (diff)
downloadlinux-9b04c764af18a1dab6d48ca0671f70cdcccf90a2.tar.xz
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')
-rw-r--r--mm/kasan/kasan.h6
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
}
/**