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Diffstat (limited to 'net/unix/af_unix.c')
-rw-r--r--net/unix/af_unix.c41
1 files changed, 41 insertions, 0 deletions
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index cef79873b09d..e2d18b9f910f 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -117,6 +117,7 @@
#include <net/checksum.h>
#include <linux/security.h>
#include <linux/freezer.h>
+#include <linux/file.h>
struct hlist_head unix_socket_table[2 * UNIX_HASH_SIZE];
EXPORT_SYMBOL_GPL(unix_socket_table);
@@ -2592,6 +2593,43 @@ long unix_outq_len(struct sock *sk)
}
EXPORT_SYMBOL_GPL(unix_outq_len);
+static int unix_open_file(struct sock *sk)
+{
+ struct path path;
+ struct file *f;
+ int fd;
+
+ if (!ns_capable(sock_net(sk)->user_ns, CAP_NET_ADMIN))
+ return -EPERM;
+
+ unix_state_lock(sk);
+ path = unix_sk(sk)->path;
+ if (!path.dentry) {
+ unix_state_unlock(sk);
+ return -ENOENT;
+ }
+
+ path_get(&path);
+ unix_state_unlock(sk);
+
+ fd = get_unused_fd_flags(O_CLOEXEC);
+ if (fd < 0)
+ goto out;
+
+ f = dentry_open(&path, O_PATH, current_cred());
+ if (IS_ERR(f)) {
+ put_unused_fd(fd);
+ fd = PTR_ERR(f);
+ goto out;
+ }
+
+ fd_install(fd, f);
+out:
+ path_put(&path);
+
+ return fd;
+}
+
static int unix_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
struct sock *sk = sock->sk;
@@ -2610,6 +2648,9 @@ static int unix_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
else
err = put_user(amount, (int __user *)arg);
break;
+ case SIOCUNIXFILE:
+ err = unix_open_file(sk);
+ break;
default:
err = -ENOIOCTLCMD;
break;