[V2] selftests/ftrace: check for do_sys_openat2 in user-memory test

From: Colin Ian King <colin.king@canonical.com>

More recent libc implementations are now using openat/openat2 system
calls so also add do_sys_openat2 to the tracing so that the test
passes on these systems because do_sys_open may not be called.

Thanks to Masami Hiramatsu for the help on getting this fix to work
correctly.

Signed-off-by: Colin Ian King <colin.king@canonical.com>
---

V2: write myevent2 using >> rather than >, also enable and disable
    myevent2
---
 .../selftests/ftrace/test.d/kprobe/kprobe_args_user.tc        | 4 ++++
 1 file changed, 4 insertions(+)

Hi,

On Fri,  2 Oct 2020 14:25:01 +0100
Colin King <colin.king@canonical.com> wrote:

> From: Colin Ian King <colin.king@canonical.com>
> 
> More recent libc implementations are now using openat/openat2 system
> calls so also add do_sys_openat2 to the tracing so that the test
> passes on these systems because do_sys_open may not be called.
> 
> Thanks to Masami Hiramatsu for the help on getting this fix to work
> correctly.
> 
> Signed-off-by: Colin Ian King <colin.king@canonical.com>

OK, this looks good to me.

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

Thank you!

> ---
> 
> V2: write myevent2 using >> rather than >, also enable and disable
>     myevent2
> ---
>  .../selftests/ftrace/test.d/kprobe/kprobe_args_user.tc        | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_user.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_user.tc
> index a30a9c07290d..d25d01a19778 100644
> --- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_user.tc
> +++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_args_user.tc
> @@ -9,12 +9,16 @@ grep -A10 "fetcharg:" README | grep -q '\[u\]<offset>' || exit_unsupported
>  :;: "user-memory access syntax and ustring working on user memory";:
>  echo 'p:myevent do_sys_open path=+0($arg2):ustring path2=+u0($arg2):string' \
>  	> kprobe_events
> +echo 'p:myevent2 do_sys_openat2 path=+0($arg2):ustring path2=+u0($arg2):string' \
> +	>> kprobe_events
>  
>  grep myevent kprobe_events | \
>  	grep -q 'path=+0($arg2):ustring path2=+u0($arg2):string'
>  echo 1 > events/kprobes/myevent/enable
> +echo 1 > events/kprobes/myevent2/enable
>  echo > /dev/null
>  echo 0 > events/kprobes/myevent/enable
> +echo 0 > events/kprobes/myevent2/enable
>  
>  grep myevent trace | grep -q 'path="/dev/null" path2="/dev/null"'
>  
> -- 
> 2.27.0
>

On Fri,  2 Oct 2020 14:25:01 +0100
Colin King <colin.king@canonical.com> wrote:

> From: Colin Ian King <colin.king@canonical.com>
> 
> More recent libc implementations are now using openat/openat2 system
> calls so also add do_sys_openat2 to the tracing so that the test
> passes on these systems because do_sys_open may not be called.
> 
> Thanks to Masami Hiramatsu for the help on getting this fix to work
> correctly.
> 
> Signed-off-by: Colin Ian King <colin.king@canonical.com>
> ---
>

Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

Shuah,

Care to take this through your tree?

-- Steve

On 10/8/20 2:48 PM, Steven Rostedt wrote:
> On Fri,  2 Oct 2020 14:25:01 +0100
> Colin King <colin.king@canonical.com> wrote:
> 
>> From: Colin Ian King <colin.king@canonical.com>
>>
>> More recent libc implementations are now using openat/openat2 system
>> calls so also add do_sys_openat2 to the tracing so that the test
>> passes on these systems because do_sys_open may not be called.
>>
>> Thanks to Masami Hiramatsu for the help on getting this fix to work
>> correctly.
>>
>> Signed-off-by: Colin Ian King <colin.king@canonical.com>
>> ---
>>
> 
> Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
> 
> Shuah,
> 
> Care to take this through your tree?
> 

Yes - Will include in my next fixes pull request.

thanks,
-- Shuah