path: root/lib/Kconfig.kasan
diff options
authorAndrey Ryabinin <>2015-02-13 14:39:25 -0800
committerLinus Torvalds <>2015-02-13 21:21:41 -0800
commitef7f0d6a6ca8c9e4b27d78895af86c2fbfaeedb2 (patch)
treeac747fe9eb870b1c501f0f13063b092bd1ff0e97 /lib/Kconfig.kasan
parent786a8959912eb94fc2381c2ae487a96ce55dabca (diff)
x86_64: add KASan support
This patch adds arch specific code for kernel address sanitizer. 16TB of virtual addressed used for shadow memory. It's located in range [ffffec0000000000 - fffffc0000000000] between vmemmap and %esp fixup stacks. At early stage we map whole shadow region with zero page. Latter, after pages mapped to direct mapping address range we unmap zero pages from corresponding shadow (see kasan_map_shadow()) and allocate and map a real shadow memory reusing vmemmap_populate() function. Also replace __pa with __pa_nodebug before shadow initialized. __pa with CONFIG_DEBUG_VIRTUAL=y make external function call (__phys_addr) __phys_addr is instrumented, so __asan_load could be called before shadow area initialized. Signed-off-by: Andrey Ryabinin <> Cc: Dmitry Vyukov <> Cc: Konstantin Serebryany <> Cc: Dmitry Chernenkov <> Signed-off-by: Andrey Konovalov <> Cc: Yuri Gribov <> Cc: Konstantin Khlebnikov <> Cc: Sasha Levin <> Cc: Christoph Lameter <> Cc: Joonsoo Kim <> Cc: Dave Hansen <> Cc: Andi Kleen <> Cc: Ingo Molnar <> Cc: Thomas Gleixner <> Cc: "H. Peter Anvin" <> Cc: Christoph Lameter <> Cc: Pekka Enberg <> Cc: David Rientjes <> Cc: Jim Davis <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'lib/Kconfig.kasan')
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
index e5b3fbe5560f..0052b1b9aadd 100644
--- a/lib/Kconfig.kasan
+++ b/lib/Kconfig.kasan
@@ -15,6 +15,7 @@ config KASAN
+ default 0xdffffc0000000000 if X86_64
prompt "Instrumentation type"