netdev - Re: [PATCH v17 0/3] BPF: New helper to obtain namespace data from current task

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Date:   Mon, 27 Apr 2020 18:47:07 -0700
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     carlos antonio neira bustos <cneirabustos@...il.com>
Cc:     Alexei Starovoitov <alexei.starovoitov@...il.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Network Development <netdev@...r.kernel.org>,
        Yonghong Song <yhs@...com>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH v17 0/3] BPF: New helper to obtain namespace data from
 current task

On Mon, Apr 27, 2020 at 6:44 PM carlos antonio neira bustos
<cneirabustos@...il.com> wrote:
>
> Hi,
>
> I’m sorry I’ll do the work needed this week.
> Thanks for the heads up.
>
> Bests.

No worries, thanks!

>
>
> El El lun, 27 de abr. de 2020 a la(s) 21:40, Andrii Nakryiko <andrii.nakryiko@...il.com> escribió:
>>
>> On Fri, Mar 13, 2020 at 5:48 AM Carlos Antonio Neira Bustos
>> <cneirabustos@...il.com> wrote:
>> >
>> > On Thu, Mar 12, 2020 at 05:45:09PM -0700, Alexei Starovoitov wrote:
>> > > On Wed, Mar 4, 2020 at 12:42 PM Carlos Neira <cneirabustos@...il.com> wrote:
>> > > >
>> > > > Currently bpf_get_current_pid_tgid(), is used to do pid filtering in bcc's
>> > > > scripts but this helper returns the pid as seen by the root namespace which is
>> > > > fine when a bcc script is not executed inside a container.
>> > > > When the process of interest is inside a container, pid filtering will not work
>> > > > if bpf_get_current_pid_tgid() is used.
>> > > > This helper addresses this limitation returning the pid as it's seen by the current
>> > > > namespace where the script is executing.
>> > > >
>> > > > In the future different pid_ns files may belong to different devices, according to the
>> > > > discussion between Eric Biederman and Yonghong in 2017 Linux plumbers conference.
>> > > > To address that situation the helper requires inum and dev_t from /proc/self/ns/pid.
>> > > > This helper has the same use cases as bpf_get_current_pid_tgid() as it can be
>> > > > used to do pid filtering even inside a container.
>> > >
>> > > Applied. Thanks.
>> > > There was one spurious trailing whitespace that I fixed in patch 3
>> > > and missing .gitignore update for test_current_pid_tgid_new_ns.
>> > > Could you please follow up with another patch to fold
>> > > test_current_pid_tgid_new_ns into test_progs.
>> > > I'd really like to consolidate all tests into single binary.
>> >
>> > Thank you very much Alexei,
>> > I'll start working on the follow up patch to add test_current_pid_tgid_new_ns into test_progs.
>> >
>>
>> Hey Carlos,
>>
>> Do you still plan to fold test_current_pid_tgid_new_ns into test_progs?
>>
>> > Bests