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xtensa: add support for KASAN

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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 <[email protected]>
This commit is contained in:
Max Filippov 2017-12-03 13:28:52 -08:00
commit c633544a61
15 changed files with 201 additions and 9 deletions
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2
Documentation/features/debug/KASAN/arch-support.txt
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@ -35,5 +35,5 @@
| um: | TODO |
| unicore32: | TODO |
| x86: | ok |
| xtensa: | TODO |
| xtensa: | ok |
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