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Diffstat (limited to 'net/unix/af_unix.c')
-rw-r--r--net/unix/af_unix.c98
1 files changed, 70 insertions, 28 deletions
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index ec68e1c05b8..aad8fb69998 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -115,8 +115,10 @@
#include <net/checksum.h>
#include <linux/security.h>
-static struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1];
-static DEFINE_SPINLOCK(unix_table_lock);
+struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1];
+EXPORT_SYMBOL_GPL(unix_socket_table);
+DEFINE_SPINLOCK(unix_table_lock);
+EXPORT_SYMBOL_GPL(unix_table_lock);
static atomic_long_t unix_nr_socks;
#define unix_sockets_unbound (&unix_socket_table[UNIX_HASH_SIZE])
@@ -172,7 +174,7 @@ static inline int unix_recvq_full(struct sock const *sk)
return skb_queue_len(&sk->sk_receive_queue) > sk->sk_max_ack_backlog;
}
-static struct sock *unix_peer_get(struct sock *s)
+struct sock *unix_peer_get(struct sock *s)
{
struct sock *peer;
@@ -183,6 +185,7 @@ static struct sock *unix_peer_get(struct sock *s)
unix_state_unlock(s);
return peer;
}
+EXPORT_SYMBOL_GPL(unix_peer_get);
static inline void unix_release_addr(struct unix_address *addr)
{
@@ -847,7 +850,7 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
atomic_set(&addr->refcnt, 1);
if (sun_path[0]) {
- unsigned int mode;
+ umode_t mode;
err = 0;
/*
* Get the parent directory, calculate the hash for last
@@ -1381,8 +1384,10 @@ static int unix_attach_fds(struct scm_cookie *scm, struct sk_buff *skb)
static int unix_scm_to_skb(struct scm_cookie *scm, struct sk_buff *skb, bool send_fds)
{
int err = 0;
+
UNIXCB(skb).pid = get_pid(scm->pid);
- UNIXCB(skb).cred = get_cred(scm->cred);
+ if (scm->cred)
+ UNIXCB(skb).cred = get_cred(scm->cred);
UNIXCB(skb).fp = NULL;
if (scm->fp && send_fds)
err = unix_attach_fds(scm, skb);
@@ -1392,6 +1397,24 @@ static int unix_scm_to_skb(struct scm_cookie *scm, struct sk_buff *skb, bool sen
}
/*
+ * Some apps rely on write() giving SCM_CREDENTIALS
+ * We include credentials if source or destination socket
+ * asserted SOCK_PASSCRED.
+ */
+static void maybe_add_creds(struct sk_buff *skb, const struct socket *sock,
+ const struct sock *other)
+{
+ if (UNIXCB(skb).cred)
+ return;
+ if (test_bit(SOCK_PASSCRED, &sock->flags) ||
+ !other->sk_socket ||
+ test_bit(SOCK_PASSCRED, &other->sk_socket->flags)) {
+ UNIXCB(skb).pid = get_pid(task_tgid(current));
+ UNIXCB(skb).cred = get_current_cred();
+ }
+}
+
+/*
* Send AF_UNIX data.
*/
@@ -1538,6 +1561,7 @@ restart:
if (sock_flag(other, SOCK_RCVTSTAMP))
__net_timestamp(skb);
+ maybe_add_creds(skb, sock, other);
skb_queue_tail(&other->sk_receive_queue, skb);
if (max_level > unix_sk(other)->recursion_level)
unix_sk(other)->recursion_level = max_level;
@@ -1652,6 +1676,7 @@ static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock,
(other->sk_shutdown & RCV_SHUTDOWN))
goto pipe_err_free;
+ maybe_add_creds(skb, sock, other);
skb_queue_tail(&other->sk_receive_queue, skb);
if (max_level > unix_sk(other)->recursion_level)
unix_sk(other)->recursion_level = max_level;
@@ -1935,6 +1960,7 @@ static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
if ((UNIXCB(skb).pid != siocb->scm->pid) ||
(UNIXCB(skb).cred != siocb->scm->cred)) {
skb_queue_head(&sk->sk_receive_queue, skb);
+ sk->sk_data_ready(sk, skb->len);
break;
}
} else {
@@ -1952,6 +1978,7 @@ static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
chunk = min_t(unsigned int, skb->len, size);
if (memcpy_toiovec(msg->msg_iov, skb->data, chunk)) {
skb_queue_head(&sk->sk_receive_queue, skb);
+ sk->sk_data_ready(sk, skb->len);
if (copied == 0)
copied = -EFAULT;
break;
@@ -1969,6 +1996,7 @@ static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
/* put the skb back if we didn't use it up.. */
if (skb->len) {
skb_queue_head(&sk->sk_receive_queue, skb);
+ sk->sk_data_ready(sk, skb->len);
break;
}
@@ -1984,6 +2012,7 @@ static int unix_stream_recvmsg(struct kiocb *iocb, struct socket *sock,
/* put message back and return */
skb_queue_head(&sk->sk_receive_queue, skb);
+ sk->sk_data_ready(sk, skb->len);
break;
}
} while (size);
@@ -2036,6 +2065,36 @@ static int unix_shutdown(struct socket *sock, int mode)
return 0;
}
+long unix_inq_len(struct sock *sk)
+{
+ struct sk_buff *skb;
+ long amount = 0;
+
+ if (sk->sk_state == TCP_LISTEN)
+ return -EINVAL;
+
+ spin_lock(&sk->sk_receive_queue.lock);
+ if (sk->sk_type == SOCK_STREAM ||
+ sk->sk_type == SOCK_SEQPACKET) {
+ skb_queue_walk(&sk->sk_receive_queue, skb)
+ amount += skb->len;
+ } else {
+ skb = skb_peek(&sk->sk_receive_queue);
+ if (skb)
+ amount = skb->len;
+ }
+ spin_unlock(&sk->sk_receive_queue.lock);
+
+ return amount;
+}
+EXPORT_SYMBOL_GPL(unix_inq_len);
+
+long unix_outq_len(struct sock *sk)
+{
+ return sk_wmem_alloc_get(sk);
+}
+EXPORT_SYMBOL_GPL(unix_outq_len);
+
static int unix_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
struct sock *sk = sock->sk;
@@ -2044,33 +2103,16 @@ static int unix_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
switch (cmd) {
case SIOCOUTQ:
- amount = sk_wmem_alloc_get(sk);
+ amount = unix_outq_len(sk);
err = put_user(amount, (int __user *)arg);
break;
case SIOCINQ:
- {
- struct sk_buff *skb;
-
- if (sk->sk_state == TCP_LISTEN) {
- err = -EINVAL;
- break;
- }
-
- spin_lock(&sk->sk_receive_queue.lock);
- if (sk->sk_type == SOCK_STREAM ||
- sk->sk_type == SOCK_SEQPACKET) {
- skb_queue_walk(&sk->sk_receive_queue, skb)
- amount += skb->len;
- } else {
- skb = skb_peek(&sk->sk_receive_queue);
- if (skb)
- amount = skb->len;
- }
- spin_unlock(&sk->sk_receive_queue.lock);
+ amount = unix_inq_len(sk);
+ if (amount < 0)
+ err = amount;
+ else
err = put_user(amount, (int __user *)arg);
- break;
- }
-
+ break;
default:
err = -ENOIOCTLCMD;
break;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-05-22 07:33:46 +0000