netdev - Re: [patch net-next] selftests: bpf: don't try to read files without read permission

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Date:   Fri, 1 Nov 2019 07:36:04 +0100
From:   Jiri Pirko <jiri@...nulli.us>
To:     Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc:     netdev@...r.kernel.org, davem@...emloft.net, shuah@...nel.org,
        ast@...nel.org, daniel@...earbox.net, rong.a.chen@...el.com,
        mlxsw@...lanox.com
Subject: Re: [patch net-next] selftests: bpf: don't try to read files without
 read permission

Fri, Nov 01, 2019 at 12:40:57AM CET, jakub.kicinski@...ronome.com wrote:
>On Thu, 31 Oct 2019 16:35:35 -0700, Jakub Kicinski wrote:
>> On Tue, 15 Oct 2019 12:00:56 +0200, Jiri Pirko wrote:
>> > From: Jiri Pirko <jiri@...lanox.com>
>> > 
>> > Recently couple of files that are write only were added to netdevsim
>> > debugfs. Don't read these files and avoid error.
>> > 
>> > Reported-by: kernel test robot <rong.a.chen@...el.com>
>> > Signed-off-by: Jiri Pirko <jiri@...lanox.com>
>> > ---
>> >  tools/testing/selftests/bpf/test_offload.py | 2 +-
>> >  1 file changed, 1 insertion(+), 1 deletion(-)
>> > 
>> > diff --git a/tools/testing/selftests/bpf/test_offload.py b/tools/testing/selftests/bpf/test_offload.py
>> > index 15a666329a34..c44c650bde3a 100755
>> > --- a/tools/testing/selftests/bpf/test_offload.py
>> > +++ b/tools/testing/selftests/bpf/test_offload.py
>> > @@ -312,7 +312,7 @@ class DebugfsDir:
>> >              if f == "ports":
>> >                  continue
>> >              p = os.path.join(path, f)
>> > -            if os.path.isfile(p):
>> > +            if os.path.isfile(p) and os.access(p, os.R_OK):  
>> 
>> Have you tested this? Looks like python always returns True here when
>> run as root, and this script requires root (and checks for it).
>
>Yeah, you definitely haven't tested this. Even if it worked we'd fall
>into the else condition and say:

Sure I tested. It worked. Odd.

>
>Exception: /sys/kernel/debug/netdevsim/netdevsim0//ports/0/dev/take_snapshot is neither file nor directory
>
>> Also the fix is needed in net, not sure why you sent it to net-next.
>> 
>> >                  _, out = cmd('cat %s/%s' % (path, f))
>> >                  dfs[f] = out.strip()
>> >              elif os.path.isdir(p):  
>