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net: Make CAP_NET_BIND_SERVICE per user namespace

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Allow privileged users in any user namespace to bind to
privileged sockets in network namespaces they control.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric W. Biederman
2012-11-16 03:03:12 +00:00
committed by David S. Miller
parent b51642f6d7
commit 3594698a1f
3 changed files with 10 additions and 6 deletions
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6
net/ipv4/af_inet.c
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@@ -474,6 +474,7 @@ int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
struct sock *sk = sock->sk;
struct inet_sock *inet = inet_sk(sk);
struct net *net = sock_net(sk);
unsigned short snum;
int chk_addr_ret;
int err;
@@ -497,7 +498,7 @@ int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
goto out;
}
chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
/* Not specified by any standard per-se, however it breaks too
* many applications when removed. It is unfortunate since
@@ -517,7 +518,8 @@ int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
snum = ntohs(addr->sin_port);
err = -EACCES;
if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
if (snum && snum < PROT_SOCK &&
!ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
goto out;
/* We keep a pair of addresses. rcv_saddr is the one