linux-kernel - [tip: x86/urgent] x86/build: Disable CET instrumentation in the kernel for 32-bit too

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Message-ID: <161286778686.23325.10302847745526792763.tip-bot2@tip-bot2>
Date:   Tue, 09 Feb 2021 10:49:46 -0000
From:   "tip-bot2 for Borislav Petkov" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     AC <achirvasub@...il.com>, Borislav Petkov <bp@...e.de>,
        Josh Poimboeuf <jpoimboe@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/urgent] x86/build: Disable CET instrumentation in the
 kernel for 32-bit too

The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     256b92af784d5043eeb7d559b6d5963dcc2ecb10
Gitweb:        https://git.kernel.org/tip/256b92af784d5043eeb7d559b6d5963dcc2ecb10
Author:        Borislav Petkov <bp@...e.de>
AuthorDate:    Mon, 08 Feb 2021 16:43:30 +01:00
Committer:     Borislav Petkov <bp@...e.de>
CommitterDate: Tue, 09 Feb 2021 11:23:47 +01:00

x86/build: Disable CET instrumentation in the kernel for 32-bit too

Commit

  20bf2b378729 ("x86/build: Disable CET instrumentation in the kernel")

disabled CET instrumentation which gets added by default by the Ubuntu
gcc9 and 10 by default, but did that only for 64-bit builds. It would
still fail when building a 32-bit target. So disable CET for all x86
builds.

Fixes: 20bf2b378729 ("x86/build: Disable CET instrumentation in the kernel")
Reported-by: AC <achirvasub@...il.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>
Tested-by: AC <achirvasub@...il.com>
Link: https://lkml.kernel.org/r/YCCIgMHkzh/xT4ex@arch-chirva.localdomain
---
 arch/x86/Makefile | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 5857917..30920d7 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -50,6 +50,9 @@ export BITS
 KBUILD_CFLAGS += -mno-sse -mno-mmx -mno-sse2 -mno-3dnow
 KBUILD_CFLAGS += $(call cc-option,-mno-avx,)
 
+# Intel CET isn't enabled in the kernel
+KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
+
 ifeq ($(CONFIG_X86_32),y)
         BITS := 32
         UTS_MACHINE := i386
@@ -120,9 +123,6 @@ else
 
         KBUILD_CFLAGS += -mno-red-zone
         KBUILD_CFLAGS += -mcmodel=kernel
-
-	# Intel CET isn't enabled in the kernel
-	KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none)
 endif
 
 ifdef CONFIG_X86_X32