From: Vince Weaver vincent.weaver@maine.edu
[ Upstream commit 7622236ceb167aa3857395f9bdaf871442aa467e ]
So I have been having lots of trouble with hand-crafted perf.data files causing segfaults and the like, so I have started fuzzing the perf tool.
First issue found:
If f_header.attr_size is 0 in the perf.data file, then perf will crash with a divide-by-zero error.
Committer note:
Added a pr_err() to tell the user why the command failed.
Signed-off-by: Vince Weaver vincent.weaver@maine.edu Cc: Alexander Shishkin alexander.shishkin@linux.intel.com Cc: Jiri Olsa jolsa@redhat.com Cc: Namhyung Kim namhyung@kernel.org Cc: Peter Zijlstra peterz@infradead.org Link: http://lkml.kernel.org/r/alpine.DEB.2.21.1907231100440.14532@macbook-air Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- tools/perf/util/header.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c index 26437143c9406..c78c2ed009ea0 100644 --- a/tools/perf/util/header.c +++ b/tools/perf/util/header.c @@ -2901,6 +2901,13 @@ int perf_session__read_header(struct perf_session *session) file->path); }
+ if (f_header.attr_size == 0) { + pr_err("ERROR: The %s file's attr size field is 0 which is unexpected.\n" + "Was the 'perf record' command properly terminated?\n", + data->file.path); + return -EINVAL; + } + nr_attrs = f_header.attrs.size / f_header.attr_size; lseek(fd, f_header.attrs.offset, SEEK_SET);