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

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Message-ID: <tencent_A8B65EDD467511570D5C8400B2102E335409@qq.com>
Date: Thu, 29 May 2025 11:26:13 +0800
From: Rong Tao <rtoax@...mail.com>
To: ast@...nel.org,
	daniel@...earbox.net
Cc: rtoax@...mail.com,
	rongtao@...tc.cn,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yonghong.song@...ux.dev>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...ichev.me>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Mykola Lysenko <mykolal@...com>,
	Shuah Khan <shuah@...nel.org>,
	Juntong Deng <juntong.deng@...look.com>,
	Amery Hung <amery.hung@...edance.com>,
	Dave Marchevsky <davemarchevsky@...com>,
	bpf@...r.kernel.org (open list:BPF [GENERAL] (Safe Dynamic Programs and Tools)),
	linux-kernel@...r.kernel.org (open list),
	linux-kselftest@...r.kernel.org (open list:KERNEL SELFTEST FRAMEWORK)
Subject: [PATCH bpf-next 0/2] Add kfunc for doing pid -> task cwd

In some application like bpftrace [1], need to get the cwd from the pid.
This patch provides a new kfunc that can get the cwd of the process from
the pid.

[1] https://github.com/bpftrace/bpftrace/issues/3314

Rong Tao (2):
  bpf: Add bpf_task_cwd_from_pid() kfunc
  selftests/bpf: Add selftests for bpf_task_cwd_from_pid()

 kernel/bpf/helpers.c                          | 45 ++++++++++++++++++
 .../selftests/bpf/prog_tests/task_kfunc.c     |  3 ++
 .../selftests/bpf/progs/task_kfunc_common.h   |  1 +
 .../selftests/bpf/progs/task_kfunc_success.c  | 47 +++++++++++++++++++
 4 files changed, 96 insertions(+)

-- 
2.49.0