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Message-Id: <20180115123410.131293856@linuxfoundation.org>
Date: Mon, 15 Jan 2018 13:35:10 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, David Woodhouse <dwmw@...zon.co.uk>,
Thomas Gleixner <tglx@...utronix.de>,
gnomes@...rguk.ukuu.org.uk, Rik van Riel <riel@...hat.com>,
Andi Kleen <ak@...ux.intel.com>,
Peter Zijlstra <peterz@...radead.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Jiri Kosina <jikos@...nel.org>,
Andy Lutomirski <luto@...capital.net>,
Dave Hansen <dave.hansen@...el.com>,
Kees Cook <keescook@...gle.com>,
Tim Chen <tim.c.chen@...ux.intel.com>,
Paul Turner <pjt@...gle.com>, Razvan Ghitulete <rga@...zon.de>,
Greg Kroah-Hartman <gregkh@...ux-foundation.org>
Subject: [PATCH 4.9 71/96] x86/cpufeatures: Add X86_BUG_SPECTRE_V[12]
4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: David Woodhouse <dwmw@...zon.co.uk>
commit 99c6fa2511d8a683e61468be91b83f85452115fa upstream.
Add the bug bits for spectre v1/2 and force them unconditionally for all
cpus.
Signed-off-by: David Woodhouse <dwmw@...zon.co.uk>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: gnomes@...rguk.ukuu.org.uk
Cc: Rik van Riel <riel@...hat.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Jiri Kosina <jikos@...nel.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: Kees Cook <keescook@...gle.com>
Cc: Tim Chen <tim.c.chen@...ux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@...ux-foundation.org>
Cc: Paul Turner <pjt@...gle.com>
Cc: stable@...r.kernel.org
Link: https://lkml.kernel.org/r/1515239374-23361-2-git-send-email-dwmw@amazon.co.uk
Signed-off-by: Razvan Ghitulete <rga@...zon.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
arch/x86/include/asm/cpufeatures.h | 2 ++
arch/x86/kernel/cpu/common.c | 3 +++
2 files changed, 5 insertions(+)
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -317,5 +317,7 @@
#define X86_BUG_MONITOR X86_BUG(12) /* IPI required to wake up remote CPU */
#define X86_BUG_AMD_E400 X86_BUG(13) /* CPU is among the affected by Erratum 400 */
#define X86_BUG_CPU_MELTDOWN X86_BUG(14) /* CPU is affected by meltdown attack and needs kernel page table isolation */
+#define X86_BUG_SPECTRE_V1 X86_BUG(15) /* CPU is affected by Spectre variant 1 attack with conditional branches */
+#define X86_BUG_SPECTRE_V2 X86_BUG(16) /* CPU is affected by Spectre variant 2 attack with indirect branches */
#endif /* _ASM_X86_CPUFEATURES_H */
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -886,6 +886,9 @@ static void __init early_identify_cpu(st
/* Assume for now that ALL x86 CPUs are insecure */
setup_force_cpu_bug(X86_BUG_CPU_MELTDOWN);
+ setup_force_cpu_bug(X86_BUG_SPECTRE_V1);
+ setup_force_cpu_bug(X86_BUG_SPECTRE_V2);
+
fpu__init_system(c);
}
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