Messages in this thread Patch in this message | | | From | Maciej Żenczykowski <> | Subject | [PATCH bpf-next] bpf: print a little more info about maps via cat /sys/fs/bpf/pinned_name | Date | Sat, 21 May 2022 00:57:36 -0700 |
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From: Maciej Żenczykowski <maze@google.com>
While this information can be fetched via bpftool, the cli tool itself isn't always available on more limited systems.
From the information printed particularly the 'id' is useful since when combined with /proc/pid/fd/X and /proc/pid/fdinfo/X it allows tracking down which bpf maps a process has open (which can be useful for tracking down fd leaks).
Signed-off-by: Maciej Żenczykowski <maze@google.com> --- kernel/bpf/inode.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/kernel/bpf/inode.c b/kernel/bpf/inode.c index 4f841e16779e..784266e258fe 100644 --- a/kernel/bpf/inode.c +++ b/kernel/bpf/inode.c @@ -257,6 +257,9 @@ static int map_seq_show(struct seq_file *m, void *v) if (unlikely(v == SEQ_START_TOKEN)) { seq_puts(m, "# WARNING!! The output is for debug purpose only\n"); seq_puts(m, "# WARNING!! The output format will change\n"); + seq_printf(m, "# type: %d, key_size: %d, value_size: %d, max_entries: %d, id: %d\n", + map->map_type, map->key_size, map->value_size, map->max_entries, + map->id); } else { map->ops->map_seq_show_elem(map, key, m); } -- 2.36.1.124.g0e6072fb45-goog
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