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authorChris Phlipot <cphlipot0@gmail.com>2018-08-29 19:19:50 -0700
committerArnaldo Carvalho de Melo <acme@redhat.com>2018-08-30 14:51:45 -0300
commitc9f23d2bc21cb263ae931f3e264d003d746107bb (patch)
treeae9b04c4000e4131a043f79aa67ba2667dabac25 /tools
parenta72f64261359b7451f8478f2a2bf357b4e6c757f (diff)
perf event-parse: Use fixed size string for comms
Some implementations of libc do not support the 'm' width modifier as part of the scanf string format specifier. This can cause the parsing to fail. Since the parser never checks if the scanf parsing was successesful, this can result in a crash. Change the comm string to be allocated as a fixed size instead of dynamically using 'm' scanf width modifier. This can be safely done since comm size is limited to 16 bytes by TASK_COMM_LEN within the kernel. This change prevents perf from crashing when linked against bionic as well as reduces the total number of heap allocations and frees invoked while accomplishing the same task. 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/20180830021950.15563-1-cphlipot0@gmail.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/trace-event-parse.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index 920b1d58a068..e76214f8d596 100644
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -164,16 +164,15 @@ void parse_ftrace_printk(struct tep_handle *pevent,
void parse_saved_cmdline(struct tep_handle *pevent,
char *file, unsigned int size __maybe_unused)
{
- char *comm;
+ char comm[17]; /* Max comm length in the kernel is 16. */
char *line;
char *next = NULL;
int pid;
line = strtok_r(file, "\n", &next);
while (line) {
- sscanf(line, "%d %ms", &pid, &comm);
- tep_register_comm(pevent, comm, pid);
- free(comm);
+ if (sscanf(line, "%d %16s", &pid, comm) == 2)
+ tep_register_comm(pevent, comm, pid);
line = strtok_r(NULL, "\n", &next);
}
}