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authorDaniel Borkmann <daniel@iogearbox.net>2016-11-26 01:28:07 +0100
committerDavid S. Miller <davem@davemloft.net>2016-11-27 20:38:47 -0500
commit21116b7068b9b66ac16b2fe3675469f459968c3f (patch)
tree7effd3820f4219954547068dba423d212457d42f /kernel/bpf
parentc491680f8f489926eebfdf2cd006767fc8bdaa49 (diff)
downloadlinux-21116b7068b9b66ac16b2fe3675469f459968c3f.tar.gz
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 <daniel@iogearbox.net> Acked-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel/bpf')
-rw-r--r--kernel/bpf/syscall.c17
1 files 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