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authorAndrey Ryabinin <aryabinin@virtuozzo.com>2018-08-10 17:23:03 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-10 20:19:58 -0700
commit3ca17b1f3628f916f79e0ab62f1bf0e45ec9ba92 (patch)
tree079b00ad1bc4e3dd0770f091a7a8b62d851a73b8 /arch
parent5832fcf9990c0e72c468e0dc6022836bb1b8d1e8 (diff)
download96b-common-3ca17b1f3628f916f79e0ab62f1bf0e45ec9ba92.tar.gz
lib/ubsan: remove null-pointer checks
With gcc-8 fsanitize=null become very noisy. GCC started to complain about things like &a->b, where 'a' is NULL pointer. There is no NULL dereference, we just calculate address to struct member. It's technically undefined behavior so UBSAN is correct to report it. But as long as there is no real NULL-dereference, I think, we should be fine. -fno-delete-null-pointer-checks compiler flag should protect us from any consequences. So let's just no use -fsanitize=null as it's not useful for us. If there is a real NULL-deref we will see crash. Even if userspace mapped something at NULL (root can do this), with things like SMAP should catch the issue. Link: http://lkml.kernel.org/r/20180802153209.813-1-aryabinin@virtuozzo.com Signed-off-by: Andrey Ryabinin <aryabinin@virtuozzo.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/parisc/Kconfig1
-rw-r--r--arch/s390/Kconfig1
2 files changed, 0 insertions, 2 deletions
diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index 46f656b8fc23..e7705dde953f 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -11,7 +11,6 @@ config PARISC
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_STRICT_KERNEL_RWX
select ARCH_HAS_UBSAN_SANITIZE_ALL
- select ARCH_WANTS_UBSAN_NO_NULL
select ARCH_SUPPORTS_MEMORY_FAILURE
select RTC_CLASS
select RTC_DRV_GENERIC
diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig
index 8a1863d9ed53..4fe5b2affa23 100644
--- a/arch/s390/Kconfig
+++ b/arch/s390/Kconfig
@@ -106,7 +106,6 @@ config S390
select ARCH_USE_BUILTIN_BSWAP
select ARCH_USE_CMPXCHG_LOCKREF
select ARCH_WANTS_DYNAMIC_TASK_STRUCT
- select ARCH_WANTS_UBSAN_NO_NULL
select ARCH_WANT_IPC_PARSE_VERSION
select BUILDTIME_EXTABLE_SORT
select CLONE_BACKWARDS2