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bpf: show prog and map id in fdinfo 

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>
hifive-unleashed-5.1
Daniel Borkmann 2018-06-02 23:06:34 +02:00 committed by Alexei Starovoitov
parent 3fe2867cdf
commit 4316b40914
1 changed files with 8 additions and 4 deletions
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12
kernel/bpf/syscall.c
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@ -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