netdev - Re: [PATCH V11 0/4] BPF: New helper to obtain namespace data from current task

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Date:   Tue, 24 Sep 2019 20:01:17 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     Carlos Neira <cneirabustos@...il.com>
Cc:     netdev@...r.kernel.org, yhs@...com, ebiederm@...ssion.com,
        brouer@...hat.com, bpf@...r.kernel.org
Subject: Re: [PATCH V11 0/4] BPF: New helper to obtain namespace data from
 current task

On Tue, Sep 24, 2019 at 12:20:01PM -0300, Carlos Neira 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.
> 
> Signed-off-by: Carlos Neira <cneirabustos@...il.com>
> 
> Carlos Neira (4):
>   fs/nsfs.c: added ns_match
>   bpf: added new helper bpf_get_ns_current_pid_tgid
>   tools: Added bpf_get_ns_current_pid_tgid helper
>   tools/testing/selftests/bpf: Add self-tests for new helper. self tests
>     added for new helper

bpf-next is currently closed due to merge window. Please resubmit once back open, thanks.