diff options
| author | Andrey Ryabinin <aryabinin@virtuozzo.com> | 2018-08-10 17:23:03 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-08-10 20:19:58 -0700 |
| commit | 3ca17b1f3628f916f79e0ab62f1bf0e45ec9ba92 (patch) | |
| tree | 079b00ad1bc4e3dd0770f091a7a8b62d851a73b8 /arch/parisc | |
| parent | 5832fcf9990c0e72c468e0dc6022836bb1b8d1e8 (diff) | |
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/parisc')
| -rw-r--r-- | arch/parisc/Kconfig | 1 |
1 files changed, 0 insertions, 1 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 |