6.12-stable review patch. If anyone has any objections, please let me know.
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From: Kees Cook kees@kernel.org
[ Upstream commit d6a0e0bfecccdcecb08defe75a137c7262352102 ]
Depending on !COMPILE_TEST isn't sufficient to keep this feature out of CI because we can't stop it from being included in randconfig builds. This feature is still highly experimental, and is developed in lock-step with Clang's Overflow Behavior Types[1]. Depend on BROKEN to keep it from being enabled by anyone not expecting it.
Link: https://discourse.llvm.org/t/rfc-v2-clang-introduce-overflowbehaviortypes-fo... [1] Reported-by: kernel test robot oliver.sang@intel.com Closes: https://lore.kernel.org/oe-lkp/202505281024.f42beaa7-lkp@intel.com Fixes: 557f8c582a9b ("ubsan: Reintroduce signed overflow sanitizer") Acked-by: Eric Biggers ebiggers@kernel.org Link: https://lore.kernel.org/r/20250528182616.work.296-kees@kernel.org Reviewed-by: Nathan Chancellor nathan@kernel.org Acked-by: Marco Elver elver@google.com Signed-off-by: Kees Cook kees@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- lib/Kconfig.ubsan | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan index 37655f58b8554..4e4dc430614a4 100644 --- a/lib/Kconfig.ubsan +++ b/lib/Kconfig.ubsan @@ -118,6 +118,8 @@ config UBSAN_UNREACHABLE
config UBSAN_SIGNED_WRAP bool "Perform checking for signed arithmetic wrap-around" + # This is very experimental so drop the next line if you really want it + depends on BROKEN depends on !COMPILE_TEST # The no_sanitize attribute was introduced in GCC with version 8. depends on !CC_IS_GCC || GCC_VERSION >= 80000