Messages in this thread Patch in this message | | | From | Arnaldo Carvalho de Melo <> | Subject | [PATCH 03/35] tools lib traceevent: Fix buffer overflow in arg_eval | Date | Thu, 7 Mar 2019 14:44:01 -0300 |
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From: Tony Jones <tonyj@suse.de>
Fix buffer overflow observed when running perf test.
The overflow is when trying to evaluate "1ULL << (64 - 1)" which is resulting in -9223372036854775808 which overflows the 20 character buffer.
If is possible this bug has been reported before but I still don't see any fix checked in:
See: https://www.spinics.net/lists/linux-perf-users/msg07714.html
Reported-by: Michael Sartain <mikesart@fastmail.com> Reported-by: Mathias Krause <minipli@googlemail.com> Signed-off-by: Tony Jones <tonyj@suse.de> Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Fixes: f7d82350e597 ("tools/events: Add files to create libtraceevent.a") Link: http://lkml.kernel.org/r/20190228015532.8941-1-tonyj@suse.de Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> --- tools/lib/traceevent/event-parse.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c index abd4fa5d3088..87494c7c619d 100644 --- a/tools/lib/traceevent/event-parse.c +++ b/tools/lib/traceevent/event-parse.c @@ -2457,7 +2457,7 @@ static int arg_num_eval(struct tep_print_arg *arg, long long *val) static char *arg_eval (struct tep_print_arg *arg) { long long val; - static char buf[20]; + static char buf[24]; switch (arg->type) { case TEP_PRINT_ATOM: -- 2.20.1
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