This is a note to let you know that I've just added the patch titled
x86/cpu: Implement CPU vulnerabilites sysfs functions
to the 4.9-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-cpu-implement-cpu-vulnerabilites-sysfs-functions.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 61dc0f555b5c761cdafb0ba5bd41ecf22d68a4c4 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Date: Sun, 7 Jan 2018 22:48:01 +0100
Subject: x86/cpu: Implement CPU vulnerabilites sysfs functions
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
commit 61dc0f555b5c761cdafb0ba5bd41ecf22d68a4c4 upstream.
Implement the CPU vulnerabilty show functions for meltdown, spectre_v1 and
spectre_v2.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: David Woodhouse <dwmw@xxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/20180107214913.177414879@xxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/Kconfig | 1 +
arch/x86/kernel/cpu/bugs.c | 29 +++++++++++++++++++++++++++++
2 files changed, 30 insertions(+)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -64,6 +64,7 @@ config X86
select GENERIC_CLOCKEVENTS_MIN_ADJUST
select GENERIC_CMOS_UPDATE
select GENERIC_CPU_AUTOPROBE
+ select GENERIC_CPU_VULNERABILITIES
select GENERIC_EARLY_IOREMAP
select GENERIC_FIND_FIRST_BIT
select GENERIC_IOMAP
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -9,6 +9,7 @@
*/
#include <linux/init.h>
#include <linux/utsname.h>
+#include <linux/cpu.h>
#include <asm/bugs.h>
#include <asm/processor.h>
#include <asm/processor-flags.h>
@@ -49,3 +50,31 @@ void __init check_bugs(void)
fpu__init_check_bugs();
}
+
+#ifdef CONFIG_SYSFS
+ssize_t cpu_show_meltdown(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ if (!boot_cpu_has_bug(X86_BUG_CPU_MELTDOWN))
+ return sprintf(buf, "Not affected\n");
+ if (boot_cpu_has(X86_FEATURE_PTI))
+ return sprintf(buf, "Mitigation: PTI\n");
+ return sprintf(buf, "Vulnerable\n");
+}
+
+ssize_t cpu_show_spectre_v1(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V1))
+ return sprintf(buf, "Not affected\n");
+ return sprintf(buf, "Vulnerable\n");
+}
+
+ssize_t cpu_show_spectre_v2(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ if (!boot_cpu_has_bug(X86_BUG_SPECTRE_V2))
+ return sprintf(buf, "Not affected\n");
+ return sprintf(buf, "Vulnerable\n");
+}
+#endif
Patches currently in stable-queue which might be from tglx@xxxxxxxxxxxxx are
queue-4.9/x86-spectre-add-boot-time-option-to-select-spectre-v2-mitigation.patch
queue-4.9/x86-retpoline-irq32-convert-assembler-indirect-jumps.patch
queue-4.9/objtool-detect-jumps-to-retpoline-thunks.patch
queue-4.9/x86-cpufeatures-add-x86_bug_spectre_v.patch
queue-4.9/x86-microcode-intel-extend-bdw-late-loading-with-a-revision-check.patch
queue-4.9/x86-alternatives-add-missing-n-at-end-of-alternative-inline-asm.patch
queue-4.9/x86-retpoline-hyperv-convert-assembler-indirect-jumps.patch
queue-4.9/x86-retpoline-entry-convert-entry-assembler-indirect-jumps.patch
queue-4.9/x86-asm-use-register-variable-to-get-stack-pointer-value.patch
queue-4.9/sysfs-cpu-fix-typos-in-vulnerability-documentation.patch
queue-4.9/x86-cpufeatures-add-x86_bug_cpu_insecure.patch
queue-4.9/objtool-modules-discard-objtool-annotation-sections-for-modules.patch
queue-4.9/x86-cpufeatures-make-cpu-bugs-sticky.patch
queue-4.9/x86-cpu-amd-make-lfence-a-serializing-instruction.patch
queue-4.9/x86-retpoline-ftrace-convert-ftrace-assembler-indirect-jumps.patch
queue-4.9/x86-documentation-add-pti-description.patch
queue-4.9/x86-acpi-handle-sci-interrupts-above-legacy-space-gracefully.patch
queue-4.9/objtool-allow-alternatives-to-be-ignored.patch
queue-4.9/x86-cpu-implement-cpu-vulnerabilites-sysfs-functions.patch
queue-4.9/x86-retpoline-crypto-convert-crypto-assembler-indirect-jumps.patch
queue-4.9/x86-cpu-factor-out-application-of-forced-cpu-caps.patch
queue-4.9/selftests-x86-add-test_vsyscall.patch
queue-4.9/x86-retpoline-xen-convert-xen-hypercall-indirect-jumps.patch
queue-4.9/x86-cpu-merge-bugs.c-and-bugs_64.c.patch
queue-4.9/x86-retpoline-checksum32-convert-assembler-indirect-jumps.patch
queue-4.9/x86-mm-32-move-setup_clear_cpu_cap-x86_feature_pcid-earlier.patch
queue-4.9/sysfs-cpu-add-vulnerability-folder.patch
queue-4.9/x86-retpoline-fill-return-stack-buffer-on-vmexit.patch
queue-4.9/x86-pti-rename-bug_cpu_insecure-to-bug_cpu_meltdown.patch
queue-4.9/x86-acpi-reduce-code-duplication-in-mp_override_legacy_irq.patch
queue-4.9/x86-retpoline-remove-compile-time-warning.patch
queue-4.9/x86-alternatives-fix-optimize_nops-checking.patch
queue-4.9/x86-cpu-amd-use-lfence_rdtsc-in-preference-to-mfence_rdtsc.patch
queue-4.9/x86-retpoline-add-initial-retpoline-support.patch