linux-kernel - [GIT pull] perf fix for 4.19

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Message-ID: <153824547597.23234.11668873233247402922.tglx@nanos.tec.linutronix.de>
Date:   Sat, 29 Sep 2018 20:25:47 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org
Subject: [GIT pull] perf fix for 4.19

Greg,

please pull the latest perf-urgent-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git perf-urgent-for-linus

A single fix for a missing sanity check when a pinned event is tried to be
read on the wrong CPU due to a legit event scheduling failure.

Thanks,

	tglx

------------------>
Reinette Chatre (1):
      perf/core: Add sanity check to deal with pinned event failure


 kernel/events/core.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index c80549bf82c6..dcb093e7b377 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3935,6 +3935,12 @@ int perf_event_read_local(struct perf_event *event, u64 *value,
 		goto out;
 	}
 
+	/* If this is a pinned event it must be running on this CPU */
+	if (event->attr.pinned && event->oncpu != smp_processor_id()) {
+		ret = -EBUSY;
+		goto out;
+	}
+
 	/*
 	 * If the event is currently on this CPU, its either a per-task event,
 	 * or local to this CPU. Furthermore it means its ACTIVE (otherwise