From: Ian Rogers <irogers@google.com>
To: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
Leo Yan <leo.yan@linaro.org>,
Andre Przywara <andre.przywara@arm.com>,
Will Deacon <will@kernel.org>, Dave Martin <Dave.Martin@arm.com>,
linux-kernel@vger.kernel.org
Cc: Stephane Eranian <eranian@google.com>, Ian Rogers <irogers@google.com>
Subject: [PATCH] perf arm-spe: Avoid potential buffer overrun.
Date: Wed, 7 Apr 2021 08:39:55 -0700 [thread overview]
Message-ID: <20210407153955.317215-1-irogers@google.com> (raw)
SPE extended headers are >1 byte so ensure the buffer contains at
least this before reading. This issue was detected by fuzzing.
Signed-off-by: Ian Rogers <irogers@google.com>
---
tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c b/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c
index f3ac9d40cebf..2e5eff4f8f03 100644
--- a/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c
+++ b/tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c
@@ -210,8 +210,10 @@ static int arm_spe_do_get_packet(const unsigned char *buf, size_t len,
if ((hdr & SPE_HEADER0_MASK2) == SPE_HEADER0_EXTENDED) {
/* 16-bit extended format header */
- ext_hdr = 1;
+ if (len == 1)
+ return ARM_SPE_BAD_PACKET;
+ ext_hdr = 1;
hdr = buf[1];
if (hdr == SPE_HEADER1_ALIGNMENT)
return arm_spe_get_alignment(buf, len, packet);
--
2.31.0.208.g409f899ff0-goog
next reply other threads:[~2021-04-07 15:40 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-07 15:39 Ian Rogers [this message]
2021-04-07 19:24 ` [PATCH] perf arm-spe: Avoid potential buffer overrun Arnaldo Carvalho de Melo
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