linux-kernel - [PATCH bpf-next 0/2] Add kfunc for doing pid -> task lookup

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Date:   Tue, 22 Nov 2022 08:52:58 -0600
From:   David Vernet <void@...ifault.com>
To:     bpf@...r.kernel.org
Cc:     ast@...nel.org, andrii@...nel.org, daniel@...earbox.net,
        martin.lau@...ux.dev, yhs@...com, song@...nel.org, sdf@...gle.com,
        john.fastabend@...il.com, kpsingh@...nel.org, jolsa@...nel.org,
        haoluo@...gle.com, tj@...nel.org, kernel-team@...com,
        linux-kernel@...r.kernel.org
Subject: [PATCH bpf-next 0/2] Add kfunc for doing pid -> task lookup

A series of prior patches added support for storing struct task_struct *
objects as kptrs. This patch set proposes extending this with another
kfunc called bpf_task_from_pid() which performs a lookup of a task from
its pid, from the root pid namespace idr.

This allows BPF programs that don't have a kptr to a task, to instead
perform a lookup by pid. This will be useful for programs that are
tracking pids and want, e.g., to do a lookup to find task->comm.

David Vernet (2):
  bpf: Add bpf_task_from_pid() kfunc
  selftests/bpf: Add selftests for bpf_task_from_pid()

 kernel/bpf/helpers.c                          | 20 +++++
 .../selftests/bpf/prog_tests/task_kfunc.c     |  3 +
 .../selftests/bpf/progs/task_kfunc_common.h   |  1 +
 .../selftests/bpf/progs/task_kfunc_success.c  | 73 +++++++++++++++++++
 4 files changed, 97 insertions(+)

-- 
2.38.1