Patch "perf/x86: Reject non sampling events with precise_ip" has been added to the 4.9-stable tree

Patch "perf/x86: Reject non sampling events with precise_ip" has been added to the 4.9-stable tree

[gregkh]

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

    perf/x86: Reject non sampling events with precise_ip

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-reject-non-sampling-events-with-precise_ip.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 foo@baz Mon Jul  3 13:33:55 CEST 2017
From: Jiri Olsa <jolsa@redhat.com>
Date: Tue, 3 Jan 2017 15:24:54 +0100
Subject: perf/x86: Reject non sampling events with precise_ip

From: Jiri Olsa <jolsa@redhat.com>


[ Upstream commit 18e7a45af91acdde99d3aa1372cc40e1f8142f7b ]

As Peter suggested [1] rejecting non sampling PEBS events,
because they dont make any sense and could cause bugs
in the NMI handler [2].

  [1] http://lkml.kernel.org/r/20170103094059.GC3093@worktop
  [2] http://lkml.kernel.org/r/1482931866-6018-3-git-send-email-jolsa@kernel.org

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vince@deater.net>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: http://lkml.kernel.org/r/20170103142454.GA26251@krava
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 arch/x86/events/core.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -505,6 +505,10 @@ int x86_pmu_hw_config(struct perf_event
 
 		if (event->attr.precise_ip > precise)
 			return -EOPNOTSUPP;
+
+		/* There's no sense in having PEBS for non sampling events: */
+		if (!is_sampling_event(event))
+			return -EINVAL;
 	}
 	/*
 	 * check that PEBS LBR correction does not conflict with


Patches currently in stable-queue which might be from jolsa@redhat.com are

queue-4.9/perf-x86-reject-non-sampling-events-with-precise_ip.patch
queue-4.9/perf-probe-fix-to-probe-on-gcc-generated-functions-in-modules.patch
queue-4.9/perf-core-fix-sys_perf_event_open-vs.-hotplug.patch
queue-4.9/perf-x86-intel-uncore-fix-hardcoded-socket-0-assumption-in-the-haswell-init-code.patch
queue-4.9/perf-probe-fix-to-show-correct-locations-for-events-on-modules.patch