diff options
| author | Max Filippov <jcmvbkbc@gmail.com> | 2017-12-03 13:28:52 -0800 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2017-12-16 22:37:12 -0800 |
| commit | c633544a6154146a210cf158157a1ae7c55473b6 (patch) | |
| tree | d670a9984373622d991c382126f341b6f32154cd /arch/xtensa/include/asm/pgtable.h | |
| parent | 1af1e8a39dc0fab5e50f10462c636da8c1e0cfbb (diff) | |
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/pgtable.h')
| -rw-r--r-- | arch/xtensa/include/asm/pgtable.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/xtensa/include/asm/pgtable.h b/arch/xtensa/include/asm/pgtable.h index 30dd5b2e4ad5..38802259978f 100644 --- a/arch/xtensa/include/asm/pgtable.h +++ b/arch/xtensa/include/asm/pgtable.h @@ -12,9 +12,9 @@ #define _XTENSA_PGTABLE_H #define __ARCH_USE_5LEVEL_HACK -#include <asm-generic/pgtable-nopmd.h> #include <asm/page.h> #include <asm/kmem_layout.h> +#include <asm-generic/pgtable-nopmd.h> /* * We only use two ring levels, user and kernel space. @@ -170,6 +170,7 @@ #define PAGE_SHARED_EXEC \ __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_WRITABLE | _PAGE_HW_EXEC) #define PAGE_KERNEL __pgprot(_PAGE_PRESENT | _PAGE_HW_WRITE) +#define PAGE_KERNEL_RO __pgprot(_PAGE_PRESENT) #define PAGE_KERNEL_EXEC __pgprot(_PAGE_PRESENT|_PAGE_HW_WRITE|_PAGE_HW_EXEC) #if (DCACHE_WAY_SIZE > PAGE_SIZE) |