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Commit 725c4d22 authored by Christian Borntraeger's avatar Christian Borntraeger Committed by Martin Schwidefsky
Browse files

ubsan: allow to disable the null sanitizer 



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: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
Acked-by: default avatarAndrey Ryabinin <aryabinin@virtuozzo.com>
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent f296190e

lib/Kconfig.ubsan

+11 −0
Original line number Diff line number Diff line 
config ARCH_HAS_UBSAN_SANITIZE_ALL

	bool



config ARCH_WANTS_UBSAN_NO_NULL

	def_bool n



config UBSAN

	bool "Undefined behaviour sanity checker"

	help
@@ -34,3 +37,11 @@ config UBSAN_ALIGNMENT 
	  This option enables detection of unaligned memory accesses.

	  Enabling this option on architectures that support unaligned

	  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.

scripts/Makefile.ubsan

+4 −1
Original line number Diff line number Diff line
@@ -3,7 +3,6 @@ ifdef CONFIG_UBSAN 
      CFLAGS_UBSAN += $(call cc-option, -fsanitize=integer-divide-by-zero)

      CFLAGS_UBSAN += $(call cc-option, -fsanitize=unreachable)

      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=bounds)

      CFLAGS_UBSAN += $(call cc-option, -fsanitize=object-size)
@@ -14,4 +13,8 @@ ifdef CONFIG_UBSAN 
ifdef CONFIG_UBSAN_ALIGNMENT

      CFLAGS_UBSAN += $(call cc-option, -fsanitize=alignment)

endif



ifdef CONFIG_UBSAN_NULL

      CFLAGS_UBSAN += $(call cc-option, -fsanitize=null)

endif

endif