linux-kernel - [PATCH v3 bpf-next 0/3] libbpf: Fix event name too long error and add tests

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Message-Id: <20250414093402.384872-1-yangfeng59949@163.com>
Date: Mon, 14 Apr 2025 17:33:59 +0800
From: Feng Yang <yangfeng59949@....com>
To: ast@...nel.org,
	daniel@...earbox.net,
	andrii@...nel.org,
	martin.lau@...ux.dev,
	eddyz87@...il.com,
	song@...nel.org,
	yonghong.song@...ux.dev,
	john.fastabend@...il.com,
	kpsingh@...nel.org,
	sdf@...ichev.me,
	haoluo@...gle.com,
	jolsa@...nel.org,
	hengqi.chen@...il.com
Cc: bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 bpf-next 0/3] libbpf: Fix event name too long error and add tests

From: Feng Yang <yangfeng@...inos.cn>

Hi everyone,

This series tries to fix event name too long error and add tests.

When the binary path is excessively long, the generated probe_name in libbpf
exceeds the kernel's MAX_EVENT_NAME_LEN limit (64 bytes).
This causes legacy uprobe event attachment to fail with error code -22.

---
Changes in v3:
- add __sync_fetch_and_add(&index) and let snprintf() do the trimming. Thanks, Andrii Nakryiko!
- add selftests.
- Link to v2: https://lore.kernel.org/all/20250411080545.319865-1-yangfeng59949@163.com/

Changes in v2:
- Use basename() and %.32s to fix. Thanks, Hengqi Chen!
- Link to v1: https://lore.kernel.org/all/20250410052712.206785-1-yangfeng59949@163.com/

Feng Yang (3):
  libbpf: Fix event name too long error
  selftests/bpf: Add test for attaching uprobe with long event names
  selftests/bpf: Add test for attaching kprobe with long event names

 tools/lib/bpf/libbpf.c                        | 19 +++--
 .../selftests/bpf/prog_tests/attach_probe.c   | 84 +++++++++++++++++++
 .../selftests/bpf/test_kmods/bpf_testmod.c    |  5 ++
 .../bpf/test_kmods/bpf_testmod_kfunc.h        |  2 +
 4 files changed, 103 insertions(+), 7 deletions(-)

-- 
2.43.0