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 <dan...@iogearbox.net>
---
kernel/bpf/syscall.c | 22 +++++++++++++++++++++-
1 file changed, 21 insertions(+), 1 deletion(-)
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 0d3313d..6d1407b 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)
--
1.9.3
--
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