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ubsan: allow to disable the null sanitizer

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Some architectures use a hardware defined structure at address zero.
Checking for a null pointer will result in many ubsan reports.
Allow users to disable the null sanitizer.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Christian Borntraeger 2016-09-12 14:37:19 +02:00 • committed by Martin Schwidefsky
parent f296190e41
commit 725c4d22bb
2 changed files with 15 additions and 1 deletions
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11
lib/Kconfig.ubsan
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@ -1,6 +1,9 @@
config ARCH_HAS_UBSAN_SANITIZE_ALL config ARCH_HAS_UBSAN_SANITIZE_ALL
bool bool
config ARCH_WANTS_UBSAN_NO_NULL
def_bool n
config UBSAN config UBSAN
bool "Undefined behaviour sanity checker" bool "Undefined behaviour sanity checker"
help help
@ -34,3 +37,11 @@ config UBSAN_ALIGNMENT
This option enables detection of unaligned memory accesses. This option enables detection of unaligned memory accesses.
Enabling this option on architectures that support unaligned Enabling this option on architectures that support unaligned
accesses may produce a lot of false positives. accesses may produce a lot of false positives.
config UBSAN_NULL
bool "Enable checking of null pointers"
depends on UBSAN
default y if !ARCH_WANTS_UBSAN_NO_NULL
help
This option enables detection of memory accesses via a
null pointer.

5
scripts/Makefile.ubsan
View file

@ -3,7 +3,6 @@ ifdef CONFIG_UBSAN
CFLAGS_UBSAN += $(call cc-option, -fsanitize=integer-divide-by-zero) CFLAGS_UBSAN += $(call cc-option, -fsanitize=integer-divide-by-zero)
CFLAGS_UBSAN += $(call cc-option, -fsanitize=unreachable) CFLAGS_UBSAN += $(call cc-option, -fsanitize=unreachable)
CFLAGS_UBSAN += $(call cc-option, -fsanitize=vla-bound) CFLAGS_UBSAN += $(call cc-option, -fsanitize=vla-bound)
CFLAGS_UBSAN += $(call cc-option, -fsanitize=null)
CFLAGS_UBSAN += $(call cc-option, -fsanitize=signed-integer-overflow) CFLAGS_UBSAN += $(call cc-option, -fsanitize=signed-integer-overflow)
CFLAGS_UBSAN += $(call cc-option, -fsanitize=bounds) CFLAGS_UBSAN += $(call cc-option, -fsanitize=bounds)
CFLAGS_UBSAN += $(call cc-option, -fsanitize=object-size) CFLAGS_UBSAN += $(call cc-option, -fsanitize=object-size)
@ -14,4 +13,8 @@ ifdef CONFIG_UBSAN
ifdef CONFIG_UBSAN_ALIGNMENT ifdef CONFIG_UBSAN_ALIGNMENT
CFLAGS_UBSAN += $(call cc-option, -fsanitize=alignment) CFLAGS_UBSAN += $(call cc-option, -fsanitize=alignment)
endif endif
ifdef CONFIG_UBSAN_NULL
CFLAGS_UBSAN += $(call cc-option, -fsanitize=null)
endif
endif endif