[PATCH bpf-next v5 2/3] bpf: Add show_fdinfo for uprobe_multi
From: Tao Chen <hidden>
Date: 2025-06-23 13:45:10
Also in:
bpf, lkml
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [security & lsm] (security audit and enforcement using bpf), bpf [tracing], the rest, tracing · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, KP Singh, Matt Bobrowski, Song Liu, Linus Torvalds, Steven Rostedt, Masami Hiramatsu
Show uprobe_multi link info with fdinfo, the info as follows: link_type: uprobe_multi link_id: 10 prog_tag: 7db356c03e61a4d4 prog_id: 42 uprobe_cnt: 3 pid: 0 path: /home/dylane/bpf/tools/testing/selftests/bpf/test_progs offset ref_ctr_offset cookie 0xa69f13 0x0 2 0xa69f1e 0x0 3 0xa69f29 0x0 1 Signed-off-by: Tao Chen <redacted> --- kernel/trace/bpf_trace.c | 44 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+)
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 8ecb1a9f85d..90209dda819 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c@@ -3171,10 +3171,54 @@ static int bpf_uprobe_multi_link_fill_link_info(const struct bpf_link *link, return err; } +#ifdef CONFIG_PROC_FS +static void bpf_uprobe_multi_show_fdinfo(const struct bpf_link *link, + struct seq_file *seq) +{ + struct bpf_uprobe_multi_link *umulti_link; + char *p, *buf; + + umulti_link = container_of(link, struct bpf_uprobe_multi_link, link); + + buf = kmalloc(PATH_MAX, GFP_KERNEL); + if (!buf) + return; + + p = d_path(&umulti_link->path, buf, PATH_MAX); + if (IS_ERR(p)) { + kfree(buf); + return; + } + + seq_printf(seq, + "uprobe_cnt:\t%u\n" + "pid:\t%u\n" + "path:\t%s\n", + umulti_link->cnt, + umulti_link->task ? task_pid_nr_ns(umulti_link->task, + task_active_pid_ns(current)) : 0, + p); + + seq_printf(seq, "%-16s %-16s %-16s\n", "offset", "ref_ctr_offset", "cookie"); + for (int i = 0; i < umulti_link->cnt; i++) { + seq_printf(seq, + "%#-16llx %#-16lx %-16llu\n", + umulti_link->uprobes[i].offset, + umulti_link->uprobes[i].ref_ctr_offset, + umulti_link->uprobes[i].cookie); + } + + kfree(buf); +} +#endif + static const struct bpf_link_ops bpf_uprobe_multi_link_lops = { .release = bpf_uprobe_multi_link_release, .dealloc_deferred = bpf_uprobe_multi_link_dealloc, .fill_link_info = bpf_uprobe_multi_link_fill_link_info, +#ifdef CONFIG_PROC_FS + .show_fdinfo = bpf_uprobe_multi_show_fdinfo, +#endif }; static int uprobe_prog_run(struct bpf_uprobe *uprobe,
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2.48.1