Patch "perf/x86: Avoid exposing wrong/stale data in intel_pmu_lbr_read_32()" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

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

    perf/x86: Avoid exposing wrong/stale data in intel_pmu_lbr_read_32()

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:
     perf-x86-avoid-exposing-wrong-stale-data-in-intel_pmu_lbr_read_32.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@vger.kernel.org> know about it.


>From f2200ac311302fcdca6556fd0c5127eab6c65a3e Mon Sep 17 00:00:00 2001
From: Peter Zijlstra <peterz@infradead.org>
Date: Tue, 11 Apr 2017 10:10:28 +0200
Subject: perf/x86: Avoid exposing wrong/stale data in intel_pmu_lbr_read_32()

From: Peter Zijlstra <peterz@infradead.org>

commit f2200ac311302fcdca6556fd0c5127eab6c65a3e upstream.

When the perf_branch_entry::{in_tx,abort,cycles} fields were added,
intel_pmu_lbr_read_32() wasn't updated to initialize them.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Fixes: 135c5612c460 ("perf/x86/intel: Support Haswell/v4 LBR format")
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/x86/events/intel/lbr.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/arch/x86/events/intel/lbr.c
+++ b/arch/x86/events/intel/lbr.c
@@ -507,6 +507,9 @@ static void intel_pmu_lbr_read_32(struct
 		cpuc->lbr_entries[i].to		= msr_lastbranch.to;
 		cpuc->lbr_entries[i].mispred	= 0;
 		cpuc->lbr_entries[i].predicted	= 0;
+		cpuc->lbr_entries[i].in_tx	= 0;
+		cpuc->lbr_entries[i].abort	= 0;
+		cpuc->lbr_entries[i].cycles	= 0;
 		cpuc->lbr_entries[i].reserved	= 0;
 	}
 	cpuc->lbr_stack.nr = i;


Patches currently in stable-queue which might be from peterz@infradead.org are

queue-4.9/x86-efi-don-t-try-to-reserve-runtime-regions.patch
queue-4.9/x86-signals-fix-lower-upper-bound-reporting-in-compat-siginfo.patch
queue-4.9/x86-vdso-ensure-vdso32_enabled-gets-set-to-valid-values-only.patch
queue-4.9/x86-vdso-plug-race-between-mapping-and-elf-header-setup.patch
queue-4.9/cgroup-kthread-close-race-window-where-new-kthreads-can-be-migrated-to-non-root-cgroups.patch
queue-4.9/perf-x86-avoid-exposing-wrong-stale-data-in-intel_pmu_lbr_read_32.patch