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SubjectRe: [PATCH] tracing/eprobe: Fix alloc event dir failed when event name no set
On Sun, 18 Sep 2022 20:29:08 +0800
Tao Chen <chentao.kernel@linux.alibaba.com> wrote:

> The event dir will alloc failed when event name no set, using the
> command:
> "echo "e:esys/ syscalls/sys_enter_openat file=\$filename:string"
> >> dynamic_events"
> It seems that dir name="syscalls/sys_enter_openat" is not allowed
> in debugfs. So just use the "sys_enter_openat" as the event name.

Good catch!

>
> Fixes: 7491e2c44278 ("tracing: Add a probe that attaches to trace
> events")

But actually, this code was introduced by below commit, so Fixes tag
must be updated. (this is important because stable backport version
will be decided by this tag.)

Fixes: 95c104c378dc ("tracing: Auto generate event name when creating a group of events")

Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

Thank you!

> Signed-off-by: Tao Chen <chentao.kernel@linux.alibaba.com>
> ---
> kernel/trace/trace_eprobe.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/kernel/trace/trace_eprobe.c b/kernel/trace/trace_eprobe.c
> index 1783e3478912..a8938e54cd34 100644
> --- a/kernel/trace/trace_eprobe.c
> +++ b/kernel/trace/trace_eprobe.c
> @@ -968,8 +968,7 @@ static int __trace_eprobe_create(int argc, const char *argv[])
> }
>
> if (!event) {
> - strscpy(buf1, argv[1], MAX_EVENT_NAME_LEN);
> - sanitize_event_name(buf1);
> + strscpy(buf1, sys_event, MAX_EVENT_NAME_LEN);
> event = buf1;
> }
>
> --
> 2.32.0
>


--
Masami Hiramatsu (Google) <mhiramat@kernel.org>

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