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tracing: Check that the synthetic event and field names are legal

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Call the is_good_name() function used by probe events to make sure
synthetic event and field names don't contain illegal characters and
cause unexpected parsing of synthetic event commands.

Link: https://lkml.kernel.org/r/c4d4bb59d3ac39bcbd70fba0cf837d6b1cedb015.1602598160.git.zanussi@kernel.org

Fixes: 4b147936fa (tracing: Add support for 'synthetic' events)
Reported-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Tested-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Tom Zanussi 2020-10-13 09:17:54 -05:00 committed by Steven Rostedt (VMware)
parent 42d120e2dd
commit 9bbb33291f
1 changed files with 9 additions and 0 deletions
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9
kernel/trace/trace_events_synth.c
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@ -572,6 +572,10 @@ static struct synth_field *parse_synth_field(int argc, const char **argv,
ret = -ENOMEM;
goto free;
}
if (!is_good_name(field->name)) {
ret = -EINVAL;
goto free;
}
if (field_type[0] == ';')
field_type++;
@ -1112,6 +1116,11 @@ static int __create_synth_event(int argc, const char *name, const char **argv)
mutex_lock(&event_mutex);
if (!is_good_name(name)) {
ret = -EINVAL;
goto out;
}
event = find_synth_event(name);
if (event) {
ret = -EEXIST;