From 21116b7068b9b66ac16b2fe3675469f459968c3f Mon Sep 17 00:00:00 2001 From: Daniel Borkmann Date: Sat, 26 Nov 2016 01:28:07 +0100 Subject: [PATCH] bpf: add owner_prog_type and accounted mem to array map's fdinfo Allow for checking the owner_prog_type of a program array map. In some cases bpf(2) can return -EINVAL /after/ the verifier passed and did all the rewrites of the bpf program. The reason that lets us fail at this late stage is that program array maps are incompatible. Allow users to inspect this earlier after they got the map fd through BPF_OBJ_GET command. tc will get support for this. Also, display how much we charged the map with regards to RLIMIT_MEMLOCK. Signed-off-by: Daniel Borkmann Acked-by: Alexei Starovoitov Signed-off-by: David S. Miller --- kernel/bpf/syscall.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 1090d16a31c1..4caa18e6860a 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -138,18 +138,31 @@ static int bpf_map_release(struct inode *inode, struct file *filp) static void bpf_map_show_fdinfo(struct seq_file *m, struct file *filp) { const struct bpf_map *map = filp->private_data; + const struct bpf_array *array; + u32 owner_prog_type = 0; + + if (map->map_type == BPF_MAP_TYPE_PROG_ARRAY) { + array = container_of(map, struct bpf_array, map); + owner_prog_type = array->owner_prog_type; + } seq_printf(m, "map_type:\t%u\n" "key_size:\t%u\n" "value_size:\t%u\n" "max_entries:\t%u\n" - "map_flags:\t%#x\n", + "map_flags:\t%#x\n" + "memlock:\t%llu\n", map->map_type, map->key_size, map->value_size, map->max_entries, - map->map_flags); + map->map_flags, + map->pages * 1ULL << PAGE_SHIFT); + + if (owner_prog_type) + seq_printf(m, "owner_prog_type:\t%u\n", + owner_prog_type); } #endif