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integer-wrap: Force full rebuild when .scl file changes

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Since the integer wrapping sanitizer's behavior depends on its associated
.scl file, we must force a full rebuild if the file changes. If not,
instrumentation may differ between targets based on when they were built.

Generate a new header file, integer-wrap.h, any time the Clang .scl
file changes. Include the header file in compiler-version.h when its
associated feature name, INTEGER_WRAP, is defined. This will be picked
up by fixdep and force rebuilds where needed.

Acked-by: Justin Stitt <justinstitt@google.com>
Link: https://lore.kernel.org/r/20250503184623.2572355-3-kees@kernel.org
Reviewed-by: Nicolas Schier <n.schier@avm.de>
Signed-off-by: Kees Cook <kees@kernel.org>
This commit is contained in:
Kees Cook
2025-05-03 11:46:20 -07:00
parent 056000c471
commit 11bb1678e2
3 changed files with 16 additions and 0 deletions
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1
scripts/Makefile.ubsan
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@@ -15,6 +15,7 @@ ubsan-cflags-$(CONFIG_UBSAN_TRAP) += $(call cc-option,-fsanitize-trap=undefined
export CFLAGS_UBSAN := $(ubsan-cflags-y)
ubsan-integer-wrap-cflags-$(CONFIG_UBSAN_INTEGER_WRAP) += \
-DINTEGER_WRAP \
-fsanitize-undefined-ignore-overflow-pattern=all \
-fsanitize=signed-integer-overflow \
-fsanitize=unsigned-integer-overflow \