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authorEric W. Biederman <ebiederm@xmission.com>2010-06-13 05:30:14 +0200
committerDavid S. Miller <davem@davemloft.net>2010-06-16 23:55:55 +0200
commit109f6e39fa07c48f580125f531f46cb7c245b528 (patch)
tree9ec97679c227394a44ebede5768f92d970cea6eb /net
parentsock: Introduce cred_to_ucred (diff)
downloadlinux-109f6e39fa07c48f580125f531f46cb7c245b528.tar.xz
linux-109f6e39fa07c48f580125f531f46cb7c245b528.zip
af_unix: Allow SO_PEERCRED to work across namespaces.
Use struct pid and struct cred to store the peer credentials on struct sock. This gives enough information to convert the peer credential information to a value relative to whatever namespace the socket is in at the time. This removes nasty surprises when using SO_PEERCRED on socket connetions where the processes on either side are in different pid and user namespaces. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Acked-by: Daniel Lezcano <daniel.lezcano@free.fr> Acked-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/sock.c18
-rw-r--r--net/unix/af_unix.c37
2 files changed, 40 insertions, 15 deletions
diff --git a/net/core/sock.c b/net/core/sock.c
index db8335ad7559..0229d5566a46 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -915,11 +915,15 @@ int sock_getsockopt(struct socket *sock, int level, int optname,
break;
case SO_PEERCRED:
- if (len > sizeof(sk->sk_peercred))
- len = sizeof(sk->sk_peercred);
- if (copy_to_user(optval, &sk->sk_peercred, len))
+ {
+ struct ucred peercred;
+ if (len > sizeof(peercred))
+ len = sizeof(peercred);
+ cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
+ if (copy_to_user(optval, &peercred, len))
return -EFAULT;
goto lenout;
+ }
case SO_PEERNAME:
{
@@ -1133,6 +1137,9 @@ static void __sk_free(struct sock *sk)
printk(KERN_DEBUG "%s: optmem leakage (%d bytes) detected.\n",
__func__, atomic_read(&sk->sk_omem_alloc));
+ if (sk->sk_peer_cred)
+ put_cred(sk->sk_peer_cred);
+ put_pid(sk->sk_peer_pid);
put_net(sock_net(sk));
sk_prot_free(sk->sk_prot_creator, sk);
}
@@ -1968,9 +1975,8 @@ void sock_init_data(struct socket *sock, struct sock *sk)
sk->sk_sndmsg_page = NULL;
sk->sk_sndmsg_off = 0;
- sk->sk_peercred.pid = 0;
- sk->sk_peercred.uid = -1;
- sk->sk_peercred.gid = -1;
+ sk->sk_peer_pid = NULL;
+ sk->sk_peer_cred = NULL;
sk->sk_write_pending = 0;
sk->sk_rcvlowat = 1;
sk->sk_rcvtimeo = MAX_SCHEDULE_TIMEOUT;
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index fef2cc5e9d2b..e1f1349fae86 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -450,11 +450,31 @@ static int unix_release_sock(struct sock *sk, int embrion)
return 0;
}
+static void init_peercred(struct sock *sk)
+{
+ put_pid(sk->sk_peer_pid);
+ if (sk->sk_peer_cred)
+ put_cred(sk->sk_peer_cred);
+ sk->sk_peer_pid = get_pid(task_tgid(current));
+ sk->sk_peer_cred = get_current_cred();
+}
+
+static void copy_peercred(struct sock *sk, struct sock *peersk)
+{
+ put_pid(sk->sk_peer_pid);
+ if (sk->sk_peer_cred)
+ put_cred(sk->sk_peer_cred);
+ sk->sk_peer_pid = get_pid(peersk->sk_peer_pid);
+ sk->sk_peer_cred = get_cred(peersk->sk_peer_cred);
+}
+
static int unix_listen(struct socket *sock, int backlog)
{
int err;
struct sock *sk = sock->sk;
struct unix_sock *u = unix_sk(sk);
+ struct pid *old_pid = NULL;
+ const struct cred *old_cred = NULL;
err = -EOPNOTSUPP;
if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET)
@@ -470,12 +490,14 @@ static int unix_listen(struct socket *sock, int backlog)
sk->sk_max_ack_backlog = backlog;
sk->sk_state = TCP_LISTEN;
/* set credentials so connect can copy them */
- sk->sk_peercred.pid = task_tgid_vnr(current);
- current_euid_egid(&sk->sk_peercred.uid, &sk->sk_peercred.gid);
+ init_peercred(sk);
err = 0;
out_unlock:
unix_state_unlock(sk);
+ put_pid(old_pid);
+ if (old_cred)
+ put_cred(old_cred);
out:
return err;
}
@@ -1140,8 +1162,7 @@ restart:
unix_peer(newsk) = sk;
newsk->sk_state = TCP_ESTABLISHED;
newsk->sk_type = sk->sk_type;
- newsk->sk_peercred.pid = task_tgid_vnr(current);
- current_euid_egid(&newsk->sk_peercred.uid, &newsk->sk_peercred.gid);
+ init_peercred(newsk);
newu = unix_sk(newsk);
newsk->sk_wq = &newu->peer_wq;
otheru = unix_sk(other);
@@ -1157,7 +1178,7 @@ restart:
}
/* Set credentials */
- sk->sk_peercred = other->sk_peercred;
+ copy_peercred(sk, other);
sock->state = SS_CONNECTED;
sk->sk_state = TCP_ESTABLISHED;
@@ -1199,10 +1220,8 @@ static int unix_socketpair(struct socket *socka, struct socket *sockb)
sock_hold(skb);
unix_peer(ska) = skb;
unix_peer(skb) = ska;
- ska->sk_peercred.pid = skb->sk_peercred.pid = task_tgid_vnr(current);
- current_euid_egid(&skb->sk_peercred.uid, &skb->sk_peercred.gid);
- ska->sk_peercred.uid = skb->sk_peercred.uid;
- ska->sk_peercred.gid = skb->sk_peercred.gid;
+ init_peercred(ska);
+ init_peercred(skb);
if (ska->sk_type != SOCK_DGRAM) {
ska->sk_state = TCP_ESTABLISHED;