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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/boot
parent1af1e8a39dc0fab5e50f10462c636da8c1e0cfbb (diff)
downloadlinux-c633544a6154146a210cf158157a1ae7c55473b6.tar.bz2
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/boot')
-rw-r--r--arch/xtensa/boot/lib/Makefile2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/xtensa/boot/lib/Makefile b/arch/xtensa/boot/lib/Makefile
index 2fe182915b63..355127faade1 100644
--- a/arch/xtensa/boot/lib/Makefile
+++ b/arch/xtensa/boot/lib/Makefile
@@ -15,6 +15,8 @@ CFLAGS_REMOVE_inftrees.o = -pg
CFLAGS_REMOVE_inffast.o = -pg
endif
+KASAN_SANITIZE := n
+
CFLAGS_REMOVE_inflate.o += -fstack-protector -fstack-protector-strong
CFLAGS_REMOVE_zmem.o += -fstack-protector -fstack-protector-strong
CFLAGS_REMOVE_inftrees.o += -fstack-protector -fstack-protector-strong