bpf: show prog and map id in fdinfo (4316b409) · Commits · 戴 / test

Its trivial and straight forward to expose it for scripts that can then use it along with bpftool in order to inspect an individual application's used maps and progs. Right now we dump some basic information in the fdinfo file but with the help of the map/prog id full introspection becomes possible now. Signed-off-by:

Daniel Borkmann <daniel@iogearbox.net> Acked-by:

Alexei Starovoitov <ast@kernel.org> Acked-by:

Song Liu <songliubraving@fb.com> Acked-by:

Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by:

Alexei Starovoitov <ast@kernel.org>

kernel/bpf/syscall.c

+8 −4

Original line number	Diff line number	Diff line
		@@ -327,13 +327,15 @@ static void bpf_map_show_fdinfo(struct seq_file m, struct file filp)
		"value_size:\t%u\n"
		"max_entries:\t%u\n"
		"map_flags:\t%#x\n"
		"memlock:\t%llu\n",
		"memlock:\t%llu\n"
		"map_id:\t%u\n",
		map->map_type,
		map->key_size,
		map->value_size,
		map->max_entries,
		map->map_flags,
		map->pages * 1ULL << PAGE_SHIFT);
		map->pages * 1ULL << PAGE_SHIFT,
		map->id);

		if (owner_prog_type) {
		seq_printf(m, "owner_prog_type:\t%u\n",
		@@ -1070,11 +1072,13 @@ static void bpf_prog_show_fdinfo(struct seq_file m, struct file filp)
		"prog_type:\t%u\n"
		"prog_jited:\t%u\n"
		"prog_tag:\t%s\n"
		"memlock:\t%llu\n",
		"memlock:\t%llu\n"
		"prog_id:\t%u\n",
		prog->type,
		prog->jited,
		prog_tag,
		prog->pages * 1ULL << PAGE_SHIFT);
		prog->pages * 1ULL << PAGE_SHIFT,
		prog->aux->id);
		}
		#endif

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