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Date:   Sun, 2 Sep 2018 05:12:55 -0700
From:   tip-bot for Jacek Tomaka <>
Subject: [tip:x86/microcode] x86/microcode: Make revision and processor
 flags world-readable

Commit-ID:  f4661d293eb2d01dfc742982761a36fafe456d46
Author:     Jacek Tomaka <>
AuthorDate: Sat, 25 Aug 2018 11:50:39 +0800
Committer:  Thomas Gleixner <>
CommitDate: Sun, 2 Sep 2018 14:09:13 +0200

x86/microcode: Make revision and processor flags world-readable

The microcode revision is already readable for non-root users via
/proc/cpuinfo. Thus, there's no reason to keep the same information
readable by root only in /sys/devices/system/cpu/cpuX/microcode/.

Make .../processor_flags world-readable too, while at it.

Reported-by: Tim Burgess <>
Signed-off-by: Jacek Tomaka <>
Signed-off-by: Borislav Petkov <>
Signed-off-by: Thomas Gleixner <>

 arch/x86/kernel/cpu/microcode/core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index b9bc8a1a584e..2637ff09d6a0 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -666,8 +666,8 @@ static ssize_t pf_show(struct device *dev,
 static DEVICE_ATTR_WO(reload);
-static DEVICE_ATTR(version, 0400, version_show, NULL);
-static DEVICE_ATTR(processor_flags, 0400, pf_show, NULL);
+static DEVICE_ATTR(version, 0444, version_show, NULL);
+static DEVICE_ATTR(processor_flags, 0444, pf_show, NULL);
 static struct attribute *mc_default_attrs[] = {

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