linux-kernel - [PATCH 013/118] perf: Treat attr.config as u64 in perf_swevent

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Message-Id: <1367933964-1564-14-git-send-email-luis.henriques@canonical.com>
Date:	Tue,  7 May 2013 14:37:39 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Tommi Rantala <tt.rantala@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, davej@...hat.com,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Ingo Molnar <mingo@...nel.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 013/118] perf: Treat attr.config as u64 in perf_swevent_init()

3.5.7.12 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tommi Rantala <tt.rantala@...il.com>

commit 8176cced706b5e5d15887584150764894e94e02f upstream.

Trinity discovered that we fail to check all 64 bits of
attr.config passed by user space, resulting to out-of-bounds
access of the perf_swevent_enabled array in
sw_perf_event_destroy().

Introduced in commit b0a873ebb ("perf: Register PMU
implementations").

Signed-off-by: Tommi Rantala <tt.rantala@...il.com>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc: davej@...hat.com
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Link: http://lkml.kernel.org/r/1365882554-30259-1-git-send-email-tt.rantala@gmail.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 kernel/events/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 11409af..0181cbd 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5129,7 +5129,7 @@ static void sw_perf_event_destroy(struct perf_event *event)
 
 static int perf_swevent_init(struct perf_event *event)
 {
-	int event_id = event->attr.config;
+	u64 event_id = event->attr.config;
 
 	if (event->attr.type != PERF_TYPE_SOFTWARE)
 		return -ENOENT;
-- 
1.8.1.2

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