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| author | Max Filippov <jcmvbkbc@gmail.com> | 2017-12-04 00:28:52 +0300 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2017-12-17 09:37:12 +0300 |
| commit | c633544a6154146a210cf158157a1ae7c55473b6 (patch) | |
| tree | d670a9984373622d991c382126f341b6f32154cd /arch/xtensa/include/asm/kmem_layout.h | |
| parent | 1af1e8a39dc0fab5e50f10462c636da8c1e0cfbb (diff) | |
| download | linux-c633544a6154146a210cf158157a1ae7c55473b6.tar.xz | |
xtensa: add support for KASAN
Cover kernel addresses above 0x90000000 by the shadow map. Enable
HAVE_ARCH_KASAN when MMU is enabled. Provide kasan_early_init that fills
shadow map with writable copies of kasan_zero_page. Call
kasan_early_init right after mmu initialization in the setup_arch.
Provide kasan_init that allocates proper shadow map pages from the
memblock and puts these pages into the shadow map for addresses from
VMALLOC area to the end of KSEG. Call kasan_init right after memblock
initialization. Don't use KASAN for the boot code, MMU and KASAN
initialization and page fault handler. Make kernel stack size 4 times
larger when KASAN is enabled to avoid stack overflows.
GCC 7.3, 8 or newer is required to build the xtensa kernel with KASAN.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/include/asm/kmem_layout.h')
| -rw-r--r-- | arch/xtensa/include/asm/kmem_layout.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/xtensa/include/asm/kmem_layout.h b/arch/xtensa/include/asm/kmem_layout.h index 28f9260a766c..2317c835a4db 100644 --- a/arch/xtensa/include/asm/kmem_layout.h +++ b/arch/xtensa/include/asm/kmem_layout.h @@ -71,7 +71,11 @@ #endif +#ifndef CONFIG_KASAN #define KERNEL_STACK_SHIFT 13 +#else +#define KERNEL_STACK_SHIFT 15 +#endif #define KERNEL_STACK_SIZE (1 << KERNEL_STACK_SHIFT) #endif |