[net PATCH 4/5] bpf: require CAP_NET_ADMIN when using sockmap maps

[John Fastabend]

From: John Fastabend <john.fastab...@gmail.com>

Restrict sockmap to CAP_NET_ADMIN.

Signed-off-by: John Fastabend <john.fastab...@gmail.com>
Acked-by: Daniel Borkmann <dan...@iogearbox.net>
---
 kernel/bpf/sockmap.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/bpf/sockmap.c b/kernel/bpf/sockmap.c
index beaabb2..2b6eb35 100644
--- a/kernel/bpf/sockmap.c
+++ b/kernel/bpf/sockmap.c
@@ -486,6 +486,9 @@ static struct bpf_map *sock_map_alloc(union bpf_attr *attr)
        int err = -EINVAL;
        u64 cost;
 
+       if (!capable(CAP_NET_ADMIN))
+               return ERR_PTR(-EPERM);
+
        /* check sanity of attributes */
        if (attr->max_entries == 0 || attr->key_size != 4 ||
            attr->value_size != 4 || attr->map_flags & ~BPF_F_NUMA_NODE)