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Code Issues Releases Wiki Activity

perf arm-spe: Avoid potential buffer overrun

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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>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andre Przywara <andre.przywara@arm.com>
Cc: Dave Martin <dave.martin@arm.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Will Deacon <will@kernel.org>
Link: http://lore.kernel.org/lkml/20210407153955.317215-1-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2021-04-07 08:39:55 -07:00 committed by Arnaldo Carvalho de Melo
parent f2013278ae
commit 92f1e8adf7
1 changed files with 3 additions and 1 deletions
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4
tools/perf/util/arm-spe-decoder/arm-spe-pkt-decoder.c
View file

@ -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);