netdev - [net PATCH 4/5] bpf: require CAP_NET

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <150833588223.3588.4249180141887196078.stgit@john-XPS-13-9360>
Date:   Wed, 18 Oct 2017 07:11:22 -0700
From:   John Fastabend <john.r.fastabend@...il.com>
To:     alexei.starovoitov@...il.com, davem@...emloft.net
Cc:     netdev@...r.kernel.org, borkmann@...earbox.net
Subject: [net PATCH 4/5] bpf: require CAP_NET_ADMIN when using sockmap maps

From: John Fastabend <john.fastabend@...il.com>

Restrict sockmap to CAP_NET_ADMIN.

Signed-off-by: John Fastabend <john.fastabend@...il.com>
Acked-by: Daniel Borkmann <daniel@...earbox.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)