[078/118] perf: Treat attr.config as u64 in perf_swevent_init()

Ben Hutchings
2013-05-10T14:41:56Z

From: Tommi Rantala <tt.rantala@gmail.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@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: Ben Hutchings <ben@decadent.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;