diff options
| author | Steven Rostedt (Google) <rostedt@goodmis.org> | 2022-08-20 16:43:18 +0300 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2022-08-21 22:56:08 +0300 |
| commit | 02333de90e5945e2fe7fc75b15b4eb9aee187f0a (patch) | |
| tree | 1363fd652e5daa5ebbdc78f794a0632c8347a1df | |
| parent | 2673c60ee67e71f2ebe34386e62d348f71edee47 (diff) | |
| download | linux-02333de90e5945e2fe7fc75b15b4eb9aee187f0a.tar.xz | |
tracing/eprobes: Do not hardcode $comm as a string
The variable $comm is hard coded as a string, which is true for both
kprobes and uprobes, but for event probes (eprobes) it is a field name. In
most cases the "comm" field would be a string, but there's no guarantee of
that fact.
Do not assume that comm is a string. Not to mention, it currently forces
comm fields to fault, as string processing for event probes is currently
broken.
Link: https://lkml.kernel.org/r/20220820134400.756152112@goodmis.org
Cc: stable@vger.kernel.org
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Tzvetomir Stoyanov <tz.stoyanov@gmail.com>
Cc: Tom Zanussi <zanussi@kernel.org>
Fixes: 7491e2c44278 ("tracing: Add a probe that attaches to trace events")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
| -rw-r--r-- | kernel/trace/trace_probe.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c index dec657af363c..4daabbb8b772 100644 --- a/kernel/trace/trace_probe.c +++ b/kernel/trace/trace_probe.c @@ -622,9 +622,10 @@ static int traceprobe_parse_probe_arg_body(const char *argv, ssize_t *size, /* * Since $comm and immediate string can not be dereferenced, - * we can find those by strcmp. + * we can find those by strcmp. But ignore for eprobes. */ - if (strcmp(arg, "$comm") == 0 || strncmp(arg, "\\\"", 2) == 0) { + if (!(flags & TPARG_FL_TPOINT) && + (strcmp(arg, "$comm") == 0 || strncmp(arg, "\\\"", 2) == 0)) { /* The type of $comm must be "string", and not an array. */ if (parg->count || (t && strcmp(t, "string"))) goto out; |