From: Tommi Rantala <tt.rantala@gmail.com>
Date: Sat, 13 Apr 2013 19:49:14 +0000 (+0300)
Subject: perf: Treat attr.config as u64 in perf_swevent_init()
X-Git-Tag: v3.4.42~9
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=da307d100cd4979e353e8265d0691263aa2a0086;p=karo-tx-linux.git

perf: Treat attr.config as u64 in perf_swevent_init()

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@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: davej@redhat.com
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Link: http://lkml.kernel.org/r/1365882554-30259-1-git-send-email-tt.rantala@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 228fdb042fad..839a24f1ddeb 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -5126,7 +5126,7 @@ 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;