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| author | Kees Cook <keescook@chromium.org> | 2022-09-29 22:57:43 -0700 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2022-09-29 23:05:00 -0700 |
| commit | 607e57c6c62c00965ae276902c166834ce73014a (patch) | |
| tree | d283aabf6a96769dd213d34cab580a0ec32f1c91 /Makefile | |
| parent | 17006e86a7641fa3c50324cfb602f0e74dac8527 (diff) | |
| download | lwn-607e57c6c62c00965ae276902c166834ce73014a.tar.gz lwn-607e57c6c62c00965ae276902c166834ce73014a.zip | |
hardening: Remove Clang's enable flag for -ftrivial-auto-var-init=zero
Now that Clang's -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang
option is no longer required, remove it from the command line. Clang 16
and later will warn when it is used, which will cause Kconfig to think
it can't use -ftrivial-auto-var-init=zero at all. Check for whether it
is required and only use it when so.
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Masahiro Yamada <masahiroy@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: linux-kbuild@vger.kernel.org
Cc: llvm@lists.linux.dev
Cc: stable@vger.kernel.org
Fixes: f02003c860d9 ("hardening: Avoid harmless Clang option under CONFIG_INIT_STACK_ALL_ZERO")
Signed-off-by: Kees Cook <keescook@chromium.org>
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 4 |
1 files changed, 2 insertions, 2 deletions
@@ -831,8 +831,8 @@ endif # Initialize all stack variables with a zero value. ifdef CONFIG_INIT_STACK_ALL_ZERO KBUILD_CFLAGS += -ftrivial-auto-var-init=zero -ifdef CONFIG_CC_IS_CLANG -# https://bugs.llvm.org/show_bug.cgi?id=45497 +ifdef CONFIG_CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER +# https://github.com/llvm/llvm-project/issues/44842 KBUILD_CFLAGS += -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang endif endif |