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s390/kasan: enable stack and global variables access checks

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By defining KASAN_SHADOW_OFFSET in Kconfig stack and global variables
memory access check instrumentation is enabled. gcc version 4.9.2 or
newer is also required.

Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Vasily Gorbik 2017-11-19 11:39:39 +01:00 committed by Martin Schwidefsky
parent f4f0d32bfb
commit 5e78596329
2 changed files with 6 additions and 1 deletions
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5
arch/s390/Kconfig
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@ -56,6 +56,11 @@ config PCI_QUIRKS
config ARCH_SUPPORTS_UPROBES
def_bool y
config KASAN_SHADOW_OFFSET
hex
depends on KASAN
default 0x30000000000
config S390
def_bool y
select ARCH_BINFMT_ELF_STATE

2
arch/s390/include/asm/kasan.h
View File

@ -9,7 +9,7 @@
#define KASAN_SHADOW_SCALE_SHIFT 3
#define KASAN_SHADOW_SIZE \
(_AC(1, UL) << (_REGION2_SHIFT - KASAN_SHADOW_SCALE_SHIFT))
#define KASAN_SHADOW_OFFSET _AC(0x30000000000, UL)
#define KASAN_SHADOW_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
#define KASAN_SHADOW_START KASAN_SHADOW_OFFSET
#define KASAN_SHADOW_END (KASAN_SHADOW_START + KASAN_SHADOW_SIZE)