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perf util: Fix bad memory access in trace info.

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[ Upstream commit a72f642613 ]

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>
This commit is contained in:
Chris Phlipot 2018-08-28 23:19:54 -07:00 committed by Greg Kroah-Hartman
parent 9d7bc329c1
commit 4095fd29fe
1 changed files with 1 additions and 1 deletions
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2
tools/perf/util/trace-event-info.c
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@ -379,7 +379,7 @@ static int record_ftrace_printk(void)
static int record_saved_cmdline(void)
{
unsigned int size;
unsigned long long size;
char *path;
struct stat st;
int ret, err = 0;