linux-kernel - [PATCH] fortify: Update compile-time tests for Clang 14

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Message-Id: <20220130181616.420092-1-keescook@chromium.org>
Date:   Sun, 30 Jan 2022 10:16:16 -0800
From:   Kees Cook <keescook@...omium.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-hardening@...r.kernel.org, llvm@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: [PATCH] fortify: Update compile-time tests for Clang 14

Clang 14 introduces support for compiletime_assert(). Update the
compile-time warning regex to catch Clang's variant of the warning text
in preparation for Clang supporting CONFIG_FORTIFY_SOURCE.

Cc: Nathan Chancellor <nathan@...nel.org>
Cc: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: linux-hardening@...r.kernel.org
Cc: llvm@...ts.linux.dev
Signed-off-by: Kees Cook <keescook@...omium.org>
---
I'm splitting this patch out of the main Clang FORTIFY enabling patch.
---
 scripts/test_fortify.sh | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/scripts/test_fortify.sh b/scripts/test_fortify.sh
index a4da365508f0..c2688ab8281d 100644
--- a/scripts/test_fortify.sh
+++ b/scripts/test_fortify.sh
@@ -46,8 +46,12 @@ if "$@" -Werror -c "$IN" -o "$OUT".o 2> "$TMP" ; then
 		status="warning: unsafe ${FUNC}() usage lacked '$WANT' symbol in $IN"
 	fi
 else
-	# If the build failed, check for the warning in the stderr (gcc).
-	if ! grep -q -m1 "error: call to .\b${WANT}\b." "$TMP" ; then
+	# If the build failed, check for the warning in the stderr.
+	# GCC:
+	# ./include/linux/fortify-string.h:316:25: error: call to '__write_overflow_field' declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror=attribute-warning]
+	# Clang 14:
+	# ./include/linux/fortify-string.h:316:4: error: call to __write_overflow_field declared with 'warning' attribute: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror,-Wattribute-warning]
+	if ! grep -Eq -m1 "error: call to .?\b${WANT}\b.?" "$TMP" ; then
 		status="warning: unsafe ${FUNC}() usage lacked '$WANT' warning in $IN"
 	fi
 fi
-- 
2.30.2