linux-kernel - [PATCH 0/7] bpf: Add probe_read_{kernel,user}_dynptr and copy_from_user

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Message-Id: <20250125-bpf_dynptr_probe-v1-0-c3cb121f6951@outlook.com>
Date: Sat, 25 Jan 2025 16:23:35 +0800
From: Levi Zim via B4 Relay <devnull+rsworktech.outlook.com@...nel.org>
To: Alexei Starovoitov <ast@...nel.org>, 
 Daniel Borkmann <daniel@...earbox.net>, 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>, Matt Bobrowski <mattbobrowski@...gle.com>, 
 Steven Rostedt <rostedt@...dmis.org>, 
 Masami Hiramatsu <mhiramat@...nel.org>, 
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, 
 Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>
Cc: bpf@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-trace-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
 Andrii Nakryiko <andrii.nakryiko@...il.com>, 
 Levi Zim <rsworktech@...look.com>
Subject: [PATCH 0/7] bpf: Add probe_read_{kernel,user}_dynptr and
 copy_from_user_dynptr

This series introduce the dynptr counterpart of the
bpf_probe_read_{kernel,user} helpers and bpf_copy_from_user helper.

These helpers are helpful for reading variable-length data from kernel
memory into dynptr without going through an intermediate buffer.

Link: https://lore.kernel.org/bpf/MEYP282MB2312CFCE5F7712FDE313215AC64D2@MEYP282MB2312.AUSP282.PROD.OUTLOOK.COM/
Suggested-by: Andrii Nakryiko <andrii.nakryiko@...il.com>
Signed-off-by: Levi Zim <rsworktech@...look.com>
---
Levi Zim (7):
      bpf: Implement bpf_probe_read_kernel_dynptr helper
      bpf: Implement bpf_probe_read_user_dynptr helper
      bpf: Implement bpf_copy_from_user_dynptr helper
      tools headers UAPI: Update tools's copy of bpf.h header
      selftests/bpf: probe_read_kernel_dynptr test
      selftests/bpf: probe_read_user_dynptr test
      selftests/bpf: copy_from_user_dynptr test

 include/linux/bpf.h                                |   3 +
 include/uapi/linux/bpf.h                           |  49 ++++++++++
 kernel/bpf/helpers.c                               |  53 ++++++++++-
 kernel/trace/bpf_trace.c                           |  72 ++++++++++++++
 tools/include/uapi/linux/bpf.h                     |  49 ++++++++++
 tools/testing/selftests/bpf/prog_tests/dynptr.c    |  45 ++++++++-
 tools/testing/selftests/bpf/progs/dynptr_success.c | 106 +++++++++++++++++++++
 7 files changed, 374 insertions(+), 3 deletions(-)
---
base-commit: d0d106a2bd21499901299160744e5fe9f4c83ddb
change-id: 20250124-bpf_dynptr_probe-ab483c554f1a

Best regards,
-- 
Levi Zim <rsworktech@...look.com>