linux-kernel - [PATCH] x86: prevent gcc from emitting SSE into boot code

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1466617030-63776-1-git-send-email-dvyukov@google.com>
Date:	Wed, 22 Jun 2016 19:37:10 +0200
From:	Dmitry Vyukov <dvyukov@...gle.com>
To:	hpa@...or.com, tglx@...utronix.de, mingo@...hat.com, x86@...nel.org
Cc:	linux-kernel@...r.kernel.org, glider@...gle.com,
	ryabinin.a.a@...il.com, kasan-dev@...glegroups.com,
	Dmitry Vyukov <dvyukov@...gle.com>
Subject: [PATCH] x86: prevent gcc from emitting SSE into boot code

Latest gcc manages to emit MOVDQA into boot code
which leads to crashes. Add more -mno-see flags.

Signed-off-by: Dmitry Vyukov <dvyukov@...gle.com>
---
 arch/x86/boot/compressed/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/boot/compressed/Makefile b/arch/x86/boot/compressed/Makefile
index f135688..7eaafb8 100644
--- a/arch/x86/boot/compressed/Makefile
+++ b/arch/x86/boot/compressed/Makefile
@@ -31,7 +31,7 @@ KBUILD_CFLAGS += -DDISABLE_BRANCH_PROFILING
 cflags-$(CONFIG_X86_32) := -march=i386
 cflags-$(CONFIG_X86_64) := -mcmodel=small
 KBUILD_CFLAGS += $(cflags-y)
-KBUILD_CFLAGS += -mno-mmx -mno-sse
+KBUILD_CFLAGS += -mno-mmx -mno-sse -mno-sse2 -mno-sse3
 KBUILD_CFLAGS += $(call cc-option,-ffreestanding)
 KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector)
 
-- 
2.8.0.rc3.226.g39d4020