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| 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/lib/memset.S | |
| parent | 1af1e8a39dc0fab5e50f10462c636da8c1e0cfbb (diff) | |
| download | linux-c633544a6154146a210cf158157a1ae7c55473b6.tar.gz linux-c633544a6154146a210cf158157a1ae7c55473b6.tar.bz2 linux-c633544a6154146a210cf158157a1ae7c55473b6.zip | |
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/lib/memset.S')
| -rw-r--r-- | arch/xtensa/lib/memset.S | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/xtensa/lib/memset.S b/arch/xtensa/lib/memset.S index a6cd04ba966f..276747dec300 100644 --- a/arch/xtensa/lib/memset.S +++ b/arch/xtensa/lib/memset.S @@ -31,7 +31,8 @@ */ .text -ENTRY(memset) +ENTRY(__memset) +WEAK(memset) entry sp, 16 # minimal stack frame # a2/ dst, a3/ c, a4/ length @@ -140,7 +141,7 @@ EX(10f) s8i a3, a5, 0 .Lbytesetdone: retw -ENDPROC(memset) +ENDPROC(__memset) .section .fixup, "ax" .align 4 |