diff mbox series

[4.4,210/312] bpf, trace: check event type in bpf_perf_event_read

Message ID 20200508123139.179064292@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg KH May 8, 2020, 12:33 p.m. UTC 
From: Alexei Starovoitov <ast@fb.com>

commit ad572d174787daa59e24b8b5c83028c09cdb5ddb upstream.

similar to bpf_perf_event_output() the bpf_perf_event_read() helper
needs to check the type of the perf_event before reading the counter.

Fixes: a43eec304259 ("bpf: introduce bpf_perf_event_output() helper")
Reported-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 kernel/trace/bpf_trace.c |    4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -206,6 +206,10 @@  static u64 bpf_perf_event_read(u64 r1, u
 	    event->pmu->count)
 		return -EINVAL;
 
+	if (unlikely(event->attr.type != PERF_TYPE_HARDWARE &&
+		     event->attr.type != PERF_TYPE_RAW))
+		return -EINVAL;
+
 	/*
 	 * we don't know if the function is run successfully by the
 	 * return value. It can be judged in other places, such as