linux-kernel - [PATCH AUTOSEL 6.6 10/15] hardening: Disable GCC randstruct for COMPILE

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Message-Id: <20250422021759.1941570-10-sashal@kernel.org>
Date: Mon, 21 Apr 2025 22:17:54 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Kees Cook <kees@...nel.org>,
	Mark Brown <broonie@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Sasha Levin <sashal@...nel.org>,
	paul@...l-moore.com,
	jmorris@...ei.org,
	serge@...lyn.com,
	mic@...ikod.net,
	linux-hardening@...r.kernel.org,
	linux-security-module@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 10/15] hardening: Disable GCC randstruct for COMPILE_TEST

From: Kees Cook <kees@...nel.org>

[ Upstream commit f5c68a4e84f9feca3be578199ec648b676db2030 ]

There is a GCC crash bug in the randstruct for latest GCC versions that
is being tickled by landlock[1]. Temporarily disable GCC randstruct for
COMPILE_TEST builds to unbreak CI systems for the coming -rc2. This can
be restored once the bug is fixed.

Suggested-by: Mark Brown <broonie@...nel.org>
Link: https://lore.kernel.org/all/20250407-kbuild-disable-gcc-plugins-v1-1-5d46ae583f5e@kernel.org/ [1]
Acked-by: Mark Brown <broonie@...nel.org>
Acked-by: Arnd Bergmann <arnd@...db.de>
Link: https://lore.kernel.org/r/20250409151154.work.872-kees@kernel.org
Signed-off-by: Kees Cook <kees@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 security/Kconfig.hardening | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/Kconfig.hardening b/security/Kconfig.hardening
index 2cff851ebfd7e..f1ba84812ab22 100644
--- a/security/Kconfig.hardening
+++ b/security/Kconfig.hardening
@@ -310,7 +310,7 @@ config CC_HAS_RANDSTRUCT
 
 choice
 	prompt "Randomize layout of sensitive kernel structures"
-	default RANDSTRUCT_FULL if COMPILE_TEST && (GCC_PLUGINS || CC_HAS_RANDSTRUCT)
+	default RANDSTRUCT_FULL if COMPILE_TEST && CC_HAS_RANDSTRUCT
 	default RANDSTRUCT_NONE
 	help
 	  If you enable this, the layouts of structures that are entirely
-- 
2.39.5