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

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Message-ID: <CAADnVQL4GR2kOoiLE0aTorvYzTPWrOCV4yKMh1BasYTVHkKxcg@mail.gmail.com>
Date:   Thu, 12 Mar 2020 17:45:09 -0700
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Carlos Neira <cneirabustos@...il.com>
Cc:     Network Development <netdev@...r.kernel.org>,
        Yonghong Song <yhs@...com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH v17 0/3] BPF: New helper to obtain namespace data from
 current task

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.