Patch "x86/cpufeatures: Add X86_BUG_SPECTRE_V[12]" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

    x86/cpufeatures: Add X86_BUG_SPECTRE_V[12]

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:

     x86-cpufeatures-add-x86_bug_spectre_v.patch

and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: David Woodhouse <[email protected]>
Date: Sat, 6 Jan 2018 11:49:23 +0000
Subject: x86/cpufeatures: Add X86_BUG_SPECTRE_V[12]

From: David Woodhouse <[email protected]>

commit 99c6fa2511d8a683e61468be91b83f85452115fa upstream.

Add the bug bits for spectre v1/2 and force them unconditionally for all cpus.

---
 arch/x86/include/asm/cpufeature.h |    2 ++
 arch/x86/kernel/cpu/common.c      |    3 +++
 2 files changed, 5 insertions(+)

@@ -278,6 +278,8 @@
 #define X86_BUG_CLFLUSH_MONITOR	X86_BUG(7) /* AAI65, CLFLUSH required before MONITOR */
 #define X86_BUG_SYSRET_SS_ATTRS	X86_BUG(8) /* SYSRET doesn't fix up SS attrs */
 #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 */
 
 #if defined(__KERNEL__) && !defined(__ASSEMBLY__)
 

@@ -834,6 +834,9 @@ 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);
 }
 

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/x86-cpufeatures-add-x86_bug_spectre_v.patch queue-4.4/x86-alternatives-add-missing-n-at-end-of-alternative-inline-asm.patch queue-4.4/sysfs-cpu-fix-typos-in-vulnerability-documentation.patch queue-4.4/x86-cpufeatures-add-x86_bug_cpu_insecure.patch queue-4.4/x86-cpufeatures-make-cpu-bugs-sticky.patch queue-4.4/x86-cpu-implement-cpu-vulnerabilites-sysfs-functions.patch queue-4.4/x86-cpu-factor-out-application-of-forced-cpu-caps.patch queue-4.4/sysfs-cpu-add-vulnerability-folder.patch queue-4.4/x86-pti-rename-bug_cpu_insecure-to-bug_cpu_meltdown.patch queue-4.4/x86-alternatives-fix-optimize_nops-checking.patch