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bpf: show prog and map id in fdinfo

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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 <[email protected]>
Acked-by: Alexei Starovoitov <[email protected]>
Acked-by: Song Liu <[email protected]>
Acked-by: Jesper Dangaard Brouer <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
This commit is contained in:
Daniel Borkmann 2018-06-02 23:06:34 +02:00 • committed by Alexei Starovoitov
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