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perf probe: Fix event namelist to duplicate string

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Fix event namelist to duplicate string. Without duplicating, adding
multiple probes causes stack overwrite bug, because it reuses a
buffer on stack while the buffer is already added in the namelist.
String duplication solves this bug because only contents of the
buffer is copied to the namelist.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20091207170046.19230.55557.stgit@dhcp-100-2-132.bos.redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Masami Hiramatsu 2009-12-07 12:00:46 -05:00 committed by Ingo Molnar
parent d56728b8d7
commit e1d2017b24
1 changed files with 3 additions and 1 deletions
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4
tools/perf/util/probe-event.c
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@ -413,12 +413,13 @@ static struct strlist *get_perf_event_names(int fd)
rawlist = get_trace_kprobe_event_rawlist(fd);
sl = strlist__new(false, NULL);
sl = strlist__new(true, NULL);
for (i = 0; i < strlist__nr_entries(rawlist); i++) {
ent = strlist__entry(rawlist, i);
parse_trace_kprobe_event(ent->s, &group, &event, NULL);
strlist__add(sl, event);
free(group);
free(event);
}
strlist__delete(rawlist);
@ -480,5 +481,6 @@ void add_trace_kprobe_events(struct probe_point *probes, int nr_probes)
strlist__add(namelist, event);
}
}
strlist__delete(namelist);
close(fd);
}