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l2tp: prevent tunnel creation on netns mismatch

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l2tp_tunnel_create is passed a pointer to the network namespace for the
tunnel, along with an optional file descriptor for the tunnel which may
be passed in from userspace via. netlink.

In the case where the file descriptor is defined, ensure that the namespace
associated with that socket matches the namespace explicitly passed to
l2tp_tunnel_create.

Signed-off-by: Tom Parkin <tparkin@katalix.com>
Signed-off-by: James Chapman <jchapman@katalix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Parkin 2013-01-31 23:43:02 +00:00 committed by David S. Miller
parent b6fdfdfab0
commit cbb95e0ca9
1 changed files with 9 additions and 2 deletions
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11
net/l2tp/l2tp_core.c
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@ -1593,11 +1593,18 @@ int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id, u32
if (err < 0)
goto err;
} else {
err = -EBADF;
sock = sockfd_lookup(fd, &err);
if (!sock) {
pr_err("tunl %hu: sockfd_lookup(fd=%d) returned %d\n",
pr_err("tunl %u: sockfd_lookup(fd=%d) returned %d\n",
tunnel_id, fd, err);
err = -EBADF;
goto err;
}
/* Reject namespace mismatches */
if (!net_eq(sock_net(sock->sk), net)) {
pr_err("tunl %u: netns mismatch\n", tunnel_id);
err = -EINVAL;
goto err;
}
}