linux-kernel - [078/118] perf: Treat attr.config as u64 in perf_swevent

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Message-ID: <lsq.1368193181.436720657@decadent.org.uk>
Date:	Fri, 10 May 2013 14:39:41 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Ingo Molnar" <mingo@...nel.org>,
	"Paul Mackerras" <paulus@...ba.org>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>,
	"Arnaldo Carvalho de Melo" <acme@...stprotocols.net>,
	davej@...hat.com, "Tommi Rantala" <tt.rantala@...il.com>
Subject: [078/118] perf: Treat attr.config as u64 in perf_swevent_init()

3.2.45-rc1 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: Ben Hutchings <ben@...adent.org.uk>
---
 kernel/events/core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5164,7 +5164,7 @@ static void sw_perf_event_destroy(struct
 
 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;

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