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Commit f99bf205 authored by Daniel Borkmann's avatar Daniel Borkmann Committed by David S. Miller
Browse files

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: default avatarDaniel Borkmann <daniel@iogearbox.net>
Acked-by: default avatarAlexei Starovoitov <ast@kernel.org>
Acked-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7b5dc0dd

kernel/bpf/syscall.c

+21 −1
Original line number Diff line number Diff line
@@ -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;
@@ -108,6 +125,9 @@ static int bpf_map_release(struct inode *inode, struct file *filp) 
}



static const struct file_operations bpf_map_fops = {

#ifdef CONFIG_PROC_FS

	.show_fdinfo	= bpf_map_show_fdinfo,

#endif

	.release	= bpf_map_release,

};