bpf: add show_fdinfo handler for maps

Add a handler for show_fdinfo() to be used by the anon-inodes
backend for eBPF maps, and dump the map specification there. Not
only useful for admins, but also it provides a minimal way to
compare specs from ELF vs pinned object.

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 21 insertions, 1 deletions

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 0d3313d02a7e..6d1407bc1531 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -93,6 +93,23 @@ void bpf_map_put(struct bpf_map *map)
         }
 }
 
+#ifdef CONFIG_PROC_FS
+static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp)
+{
+        const struct bpf_map *map = filp->private_data;
+
+        seq_printf(m,
+                   "map_type:\t%u\n"
+                   "key_size:\t%u\n"
+                   "value_size:\t%u\n"
+                   "max_entries:\t%u\n",
+                   map->map_type,
+                   map->key_size,
+                   map->value_size,
+                   map->max_entries);
+}
+#endif
+
 static int bpf_map_release(struct inode *inode, struct file *filp)
 {
         struct bpf_map *map = filp->private_data;
@@ -108,7 +125,10 @@ static int bpf_map_release(struct inode *inode, struct file *filp)
 }
 
 static const struct file_operations bpf_map_fops = {
-        .release = bpf_map_release,
+#ifdef CONFIG_PROC_FS
+        .show_fdinfo    = bpf_map_show_fdinfo,
+#endif
+        .release        = bpf_map_release,
 };
 
 int bpf_map_new_fd(struct bpf_map *map)