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Date: Wed, 15 Sep 2021 08:50:17 +0100 From: Will Deacon <will@...nel.org> To: Kees Cook <keescook@...omium.org> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Masahiro Yamada <masahiroy@...nel.org>, llvm@...ts.linux.dev, Nick Desaulniers <ndesaulniers@...gle.com>, Nathan Chancellor <nathan@...nel.org>, "Gustavo A. R. Silva" <gustavoars@...nel.org>, Michal Marek <michal.lkml@...kovi.net>, James Morris <jmorris@...ei.org>, "Serge E. Hallyn" <serge@...lyn.com>, linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org, linux-security-module@...r.kernel.org, linux-hardening@...r.kernel.org Subject: Re: [PATCH v2] hardening: Avoid harmless Clang option under CONFIG_INIT_STACK_ALL_ZERO On Tue, Sep 14, 2021 at 01:02:03PM -0700, Kees Cook wrote: > Currently under Clang, CC_HAS_AUTO_VAR_INIT_ZERO requires an extra > -enable flag compared to CC_HAS_AUTO_VAR_INIT_PATTERN. GCC does not, > and will happily ignore the Clang-specific flag. However, its presence > on the command-line is both cumbersome and confusing. Due to GCC's > tolerant behavior, though, we can continue to use a single Kconfig > cc-option test for the feature on both compilers, but then drop the > Clang-specific option in the Makefile. > > Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> > Cc: Masahiro Yamada <masahiroy@...nel.org> > Cc: llvm@...ts.linux.dev > Fixes: dcb7c0b9461c ("hardening: Clarify Kconfig text for auto-var-init") > Suggested-by: Will Deacon <will@...nel.org> > Link: https://lore.kernel.org/lkml/20210914102837.6172-1-will@kernel.org/ > Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com> > Reviewed-by: Nathan Chancellor <nathan@...nel.org> > Signed-off-by: Kees Cook <keescook@...omium.org> > --- > Makefile | 6 +++--- > security/Kconfig.hardening | 5 ++++- > 2 files changed, 7 insertions(+), 4 deletions(-) Acked-by: Will Deacon <will@...nel.org> Cheers for sorting this out! Will
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