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From: Will Deacon <will@kernel.org>
To: linux-kernel@vger.kernel.org
Cc: linux-security-module@vger.kernel.org,
	Will Deacon <will@kernel.org>, Kees Cook <keescook@chromium.org>,
	Nathan Chancellor <nathan@kernel.org>,
	Nick Desaulniers <ndesaulniers@google.com>,
	"Gustavo A . R . Silva" <gustavoars@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Subject: [PATCH] hardening: Default to INIT_STACK_ALL_ZERO if CC_HAS_AUTO_VAR_INIT_ZERO
Date: Tue, 14 Sep 2021 11:28:37 +0100	[thread overview]
Message-ID: <20210914102837.6172-1-will@kernel.org> (raw)

CC_HAS_AUTO_VAR_INIT_ZERO requires a supported set of compiler options
distinct from those needed by CC_HAS_AUTO_VAR_INIT_PATTERN, Fix up
the Kconfig dependency for INIT_STACK_ALL_ZERO to test for the former
instead of the latter, as these are the options passed by the top-level
Makefile.

Cc: Kees Cook <keescook@chromium.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Gustavo A. R. Silva <gustavoars@kernel.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Fixes: dcb7c0b9461c ("hardening: Clarify Kconfig text for auto-var-init")
Signed-off-by: Will Deacon <will@kernel.org>
---

I just noticed this while reading the code and I suspect it doesn't really
matter in practice.

 security/Kconfig.hardening | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/Kconfig.hardening b/security/Kconfig.hardening
index 90cbaff86e13..341e2fdcba94 100644
--- a/security/Kconfig.hardening
+++ b/security/Kconfig.hardening
@@ -29,7 +29,7 @@ choice
 	prompt "Initialize kernel stack variables at function entry"
 	default GCC_PLUGIN_STRUCTLEAK_BYREF_ALL if COMPILE_TEST && GCC_PLUGINS
 	default INIT_STACK_ALL_PATTERN if COMPILE_TEST && CC_HAS_AUTO_VAR_INIT_PATTERN
-	default INIT_STACK_ALL_ZERO if CC_HAS_AUTO_VAR_INIT_PATTERN
+	default INIT_STACK_ALL_ZERO if CC_HAS_AUTO_VAR_INIT_ZERO
 	default INIT_STACK_NONE
 	help
 	  This option enables initialization of stack variables at
-- 
2.33.0.309.g3052b89438-goog


             reply	other threads:[~2021-09-14 10:28 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-14 10:28 Will Deacon [this message]
2021-09-14 15:58 ` Nathan Chancellor
2021-09-14 17:21   ` Kees Cook
2021-09-14 18:53     ` Nick Desaulniers
2021-09-14 19:09       ` Kees Cook
2021-09-14 19:14       ` Kees Cook
2021-09-14 19:22         ` Nick Desaulniers
2021-09-14 19:36         ` Nathan Chancellor

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