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

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CVE-2013-2094

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>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>
This commit is contained in:
Tommi Rantala
2013-04-13 22:49:14 +03:00
committed by Tim Gardner
parent 11f44819ff
commit 0902ecf940
1 changed files with 1 additions and 1 deletions
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2
kernel/events/core.c
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@@ -5118,7 +5118,7 @@ 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;