[PATCH] hardening: Enable i386 FORTIFY_SOURCE on Clang 16+

[Kees Cook]

The i386 regparm bug exposed with FORTIFY_SOURCE with Clang was fixed
in Clang 16[1].

Link: https://github.com/llvm/llvm-project/commit/c167c0a4dcdb998affb2756ce76903a12f7d8ca5 [1]
Signed-off-by: Kees Cook <kees at kernel.org>
---
Cc: Nathan Chancellor <nathan at kernel.org>
Cc: Nick Desaulniers <ndesaulniers at google.com>
Cc: Bill Wendling <morbo at google.com>
Cc: Justin Stitt <justinstitt at google.com>
Cc: "Gustavo A. R. Silva" <gustavoars at kernel.org>
Cc: llvm at lists.linux.dev
Cc: linux-hardening at vger.kernel.org
---
 security/Kconfig.hardening | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/Kconfig.hardening b/security/Kconfig.hardening
index 23ffb0d7c845..c17366ce8224 100644
--- a/security/Kconfig.hardening
+++ b/security/Kconfig.hardening
@@ -286,7 +286,7 @@ config FORTIFY_SOURCE
 	bool "Harden common str/mem functions against buffer overflows"
 	depends on ARCH_HAS_FORTIFY_SOURCE
 	# https://github.com/llvm/llvm-project/issues/53645
-	depends on !CC_IS_CLANG || !X86_32
+	depends on !X86_32 || !CC_IS_CLANG || CLANG_VERSION >= 160000
 	help
 	  Detect overflows of buffers in common string and memory functions
 	  where the compiler can determine and validate the buffer sizes.
-- 
2.34.1