From 607e57c6c62c00965ae276902c166834ce73014a Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Thu, 29 Sep 2022 22:57:43 -0700 Subject: 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 Cc: Masahiro Yamada Cc: Nick Desaulniers 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 --- security/Kconfig.hardening | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) (limited to 'security') diff --git a/security/Kconfig.hardening b/security/Kconfig.hardening index bd2aabb2c60f..995bc42003e6 100644 --- a/security/Kconfig.hardening +++ b/security/Kconfig.hardening @@ -22,11 +22,17 @@ menu "Memory initialization" config CC_HAS_AUTO_VAR_INIT_PATTERN def_bool $(cc-option,-ftrivial-auto-var-init=pattern) -config CC_HAS_AUTO_VAR_INIT_ZERO - # GCC ignores the -enable flag, so we can test for the feature with - # a single invocation using the flag, but drop it as appropriate in - # the Makefile, depending on the presence of Clang. +config CC_HAS_AUTO_VAR_INIT_ZERO_BARE + def_bool $(cc-option,-ftrivial-auto-var-init=zero) + +config CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER + # Clang 16 and later warn about using the -enable flag, but it + # is required before then. def_bool $(cc-option,-ftrivial-auto-var-init=zero -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang) + depends on !CC_HAS_AUTO_VAR_INIT_ZERO_BARE + +config CC_HAS_AUTO_VAR_INIT_ZERO + def_bool CC_HAS_AUTO_VAR_INIT_ZERO_BARE || CC_HAS_AUTO_VAR_INIT_ZERO_ENABLER choice prompt "Initialize kernel stack variables at function entry" -- cgit v1.2.3