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authorMax Filippov <jcmvbkbc@gmail.com>2017-12-03 13:28:52 -0800
committerMax Filippov <jcmvbkbc@gmail.com>2017-12-16 22:37:12 -0800
commitc633544a6154146a210cf158157a1ae7c55473b6 (patch)
treed670a9984373622d991c382126f341b6f32154cd /arch/xtensa/Kconfig
parent1af1e8a39dc0fab5e50f10462c636da8c1e0cfbb (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/Kconfig')
-rw-r--r--arch/xtensa/Kconfig5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig
index fffe05b698ac..f9f95d6e8da8 100644
--- a/arch/xtensa/Kconfig
+++ b/arch/xtensa/Kconfig
@@ -15,6 +15,7 @@ config XTENSA
select GENERIC_IRQ_SHOW
select GENERIC_PCI_IOMAP
select GENERIC_SCHED_CLOCK
+ select HAVE_ARCH_KASAN if MMU
select HAVE_CC_STACKPROTECTOR
select HAVE_DEBUG_KMEMLEAK
select HAVE_DMA_API_DEBUG
@@ -80,6 +81,10 @@ config VARIANT_IRQ_SWITCH
config HAVE_XTENSA_GPIO32
def_bool n
+config KASAN_SHADOW_OFFSET
+ hex
+ default 0x6e400000
+
menu "Processor type and features"
choice