6.12-stable review patch. If anyone has any objections, please let me know.
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From: Nathan Chancellor nathan@kernel.org
commit cdc2e1d9d929d7f7009b3a5edca52388a2b0891f upstream.
CONFIG_UBSAN_INTEGER_WRAP is 'default UBSAN', which is problematic for a couple of reasons.
The first is that this sanitizer is under active development on the compiler side to come up with a solution that is maintainable on the compiler side and usable on the kernel side. As a result of this, there are many warnings when the sanitizer is enabled that have no clear path to resolution yet but users may see them and report them in the meantime.
The second is that this option was renamed from CONFIG_UBSAN_SIGNED_WRAP, meaning that if a configuration has CONFIG_UBSAN=y but CONFIG_UBSAN_SIGNED_WRAP=n and it is upgraded via olddefconfig (common in non-interactive scenarios such as CI), CONFIG_UBSAN_INTEGER_WRAP will be silently enabled again.
Remove 'default UBSAN' from CONFIG_UBSAN_INTEGER_WRAP until it is ready for regular usage and testing from a broader community than the folks actively working on the feature.
Cc: stable@vger.kernel.org Fixes: 557f8c582a9b ("ubsan: Reintroduce signed overflow sanitizer") Signed-off-by: Nathan Chancellor nathan@kernel.org Link: https://lore.kernel.org/r/20250414-drop-default-ubsan-integer-wrap-v1-1-3925... Signed-off-by: Kees Cook kees@kernel.org [nathan: Fix conflict due to lack of rename from ed2b548f1017 in stable] Signed-off-by: Nathan Chancellor nathan@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- lib/Kconfig.ubsan | 1 - 1 file changed, 1 deletion(-)
diff --git a/lib/Kconfig.ubsan b/lib/Kconfig.ubsan index 1d4aa7a83b3a5..37655f58b8554 100644 --- a/lib/Kconfig.ubsan +++ b/lib/Kconfig.ubsan @@ -118,7 +118,6 @@ config UBSAN_UNREACHABLE
config UBSAN_SIGNED_WRAP bool "Perform checking for signed arithmetic wrap-around" - default UBSAN depends on !COMPILE_TEST # The no_sanitize attribute was introduced in GCC with version 8. depends on !CC_IS_GCC || GCC_VERSION >= 80000