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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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8
net/sctp/socket.c
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@@ -335,6 +335,7 @@ static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
/* Bind a local address either to an endpoint or to an association. */
SCTP_STATIC int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
{
struct net *net = sock_net(sk);
struct sctp_sock *sp = sctp_sk(sk);
struct sctp_endpoint *ep = sp->ep;
struct sctp_bind_addr *bp = &ep->base.bind_addr;
@@ -378,7 +379,8 @@ SCTP_STATIC int sctp_do_bind(struct sock *sk, union sctp_addr *addr, int len)
}
}
if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
if (snum && snum < PROT_SOCK &&
!ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
return -EACCES;
/* See if the address matches any of the addresses we may have
@@ -1161,7 +1163,7 @@ static int __sctp_connect(struct sock* sk,
* be permitted to open new associations.
*/
if (ep->base.bind_addr.port < PROT_SOCK &&
!capable(CAP_NET_BIND_SERVICE)) {
!ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
err = -EACCES;
goto out_free;
}
@@ -1790,7 +1792,7 @@ SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
* associations.
*/
if (ep->base.bind_addr.port < PROT_SOCK &&
!capable(CAP_NET_BIND_SERVICE)) {
!ns_capable(net->user_ns, CAP_NET_BIND_SERVICE)) {
err = -EACCES;
goto out_unlock;
}