[<prev] [next>] [thread-next>] [day] [month] [year] [list]
Message-Id: <20221122145300.251210-1-void@manifault.com>
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
Powered by blists - more mailing lists