linux-kernel - Re: [PATCH v8 5/5] selftests/ftrace: Add selftest for testing duplicate eprobes and kprobes

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Date:   Fri, 20 Aug 2021 09:53:59 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     linux-kernel@...r.kernel.org, linux-trace-devel@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        "Tzvetomir Stoyanov" <tz.stoyanov@...il.com>,
        Tom Zanussi <zanussi@...nel.org>,
        Shuah Khan <shuah@...nel.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v8 5/5] selftests/ftrace: Add selftest for testing
 duplicate eprobes and kprobes

On Thu, 19 Aug 2021 11:26:09 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>
> 
> Add a selftest that makes sure that eprobes and kprobes can not be created
> with the same group and name as existing events.

Hmm, can you also remove kprobe event dependency from this test case?
The event probe depends on CONFIG_PROBE_EVENTS meta config, but that
is enabled both of CONFIG_KPROBE_EVENTS and CONFIG_UPROBE_EVENTS.
This means if the kernel configs CONFIG_KPROBE_EVENTS=n and
CONFIG_UPROBE_EVENTS=y, this will be executed but should fail.

Thank you,

> 
> Cc: Shuah Khan <shuah@...nel.org>
> Cc: Shuah Khan <skhan@...uxfoundation.org>
> Cc: linux-kselftest@...r.kernel.org
> Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> ---
>  .../ftrace/test.d/dynevent/test_duplicates.tc | 28 +++++++++++++++++++
>  1 file changed, 28 insertions(+)
>  create mode 100644 tools/testing/selftests/ftrace/test.d/dynevent/test_duplicates.tc
> 
> diff --git a/tools/testing/selftests/ftrace/test.d/dynevent/test_duplicates.tc b/tools/testing/selftests/ftrace/test.d/dynevent/test_duplicates.tc
> new file mode 100644
> index 000000000000..022b569267ed
> --- /dev/null
> +++ b/tools/testing/selftests/ftrace/test.d/dynevent/test_duplicates.tc
> @@ -0,0 +1,28 @@
> +#!/bin/sh
> +# SPDX-License-Identifier: GPL-2.0
> +# description: Generic dynamic event - check if duplicate events are caught
> +# requires: dynamic_events "e[:[<group>/]<event>] <attached-group>.<attached-event>o [<args>]":README
> +
> +echo 0 > events/enable
> +
> +clear_dynamic_events
> +
> +# first create dynamic events for eprobes and kprobes.
> +
> +echo 'e:egroup/eevent syscalls/sys_enter_openat file=+0($filename):ustring' >> dynamic_events
> +echo 'p:kgroup/kevent vfs_open file=+0($arg2)' >> dynamic_events
> +
> +# Test eprobe for same eprobe, existing kprobe and existing event
> +! echo 'e:egroup/eevent syscalls/sys_enter_openat file=+0($filename):ustring' >> dynamic_events
> +! echo 'e:kgroup/kevent syscalls/sys_enter_openat file=+0($filename):ustring' >> dynamic_events
> +! echo 'e:syscalls/sys_enter_open syscalls/sys_enter_openat file=+0($filename):ustring' >> dynamic_events
> +
> +# Test kprobe for same kprobe, existing eprobe and existing event
> +! echo 'p:kgroup/kevent vfs_open file=+0($arg2)' >> dynamic_events
> +! echo 'p:egroup/eevent vfs_open file=+0($arg2)' >> dynamic_events
> +! echo 'p:syscalls/sys_enter_open vfs_open file=+0($arg2)' >> dynamic_events
> +
> +echo '-:egroup/eevent' >> dynamic_events
> +echo '-:kgroup/kevent' >> dynamic_events
> +
> +clear_trace
> -- 
> 2.30.2


-- 
Masami Hiramatsu <mhiramat@...nel.org>