| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.18 091/168] perf util: Fix bad memory access in trace info. | Date | Mon, 8 Oct 2018 20:31:11 +0200 |
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4.18-stable review patch. If anyone has any objections, please let me know.
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From: Chris Phlipot <cphlipot0@gmail.com>
[ Upstream commit a72f64261359b7451f8478f2a2bf357b4e6c757f ]
In the write to the output_fd in the error condition of record_saved_cmdline(), we are writing 8 bytes from a memory location on the stack that contains a primitive that is only 4 bytes in size. Change the primitive to 8 bytes in size to match the size of the write in order to avoid reading unknown memory from the stack.
Signed-off-by: Chris Phlipot <cphlipot0@gmail.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20180829061954.18871-1-cphlipot0@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- tools/perf/util/trace-event-info.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/tools/perf/util/trace-event-info.c +++ b/tools/perf/util/trace-event-info.c @@ -377,7 +377,7 @@ out: static int record_saved_cmdline(void) { - unsigned int size; + unsigned long long size; char *path; struct stat st; int ret, err = 0;
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