1 files changed, 122 insertions, 22 deletions

diff --git a/net/socket.c b/net/socket.c
index 1ba57d888981..8ef8ba81b9e2 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -63,11 +63,13 @@
 #include <linux/file.h>
 #include <linux/net.h>
 #include <linux/interrupt.h>
+#include <linux/thread_info.h>
 #include <linux/rcupdate.h>
 #include <linux/netdevice.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
 #include <linux/mutex.h>
+#include <linux/thread_info.h>
 #include <linux/wanrouter.h>
 #include <linux/if_bridge.h>
 #include <linux/if_frad.h>
@@ -263,7 +265,7 @@ static void sock_destroy_inode(struct inode *inode)
 			container_of(inode, struct socket_alloc, vfs_inode));
 }
 
-static void init_once(struct kmem_cache *cachep, void *foo)
+static void init_once(void *foo)
 {
 	struct socket_alloc *ei = (struct socket_alloc *)foo;
 
@@ -349,11 +351,11 @@ static struct dentry_operations sockfs_dentry_operations = {
  *	but we take care of internal coherence yet.
  */
 
-static int sock_alloc_fd(struct file **filep)
+static int sock_alloc_fd(struct file **filep, int flags)
 {
 	int fd;
 
-	fd = get_unused_fd();
+	fd = get_unused_fd_flags(flags);
 	if (likely(fd >= 0)) {
 		struct file *file = get_empty_filp();
 
@@ -367,7 +369,7 @@ static int sock_alloc_fd(struct file **filep)
 	return fd;
 }
 
-static int sock_attach_fd(struct socket *sock, struct file *file)
+static int sock_attach_fd(struct socket *sock, struct file *file, int flags)
 {
 	struct dentry *dentry;
 	struct qstr name = { .name = "" };
@@ -389,20 +391,20 @@ static int sock_attach_fd(struct socket *sock, struct file *file)
 	init_file(file, sock_mnt, dentry, FMODE_READ | FMODE_WRITE,
 		  &socket_file_ops);
 	SOCK_INODE(sock)->i_fop = &socket_file_ops;
-	file->f_flags = O_RDWR;
+	file->f_flags = O_RDWR | (flags & O_NONBLOCK);
 	file->f_pos = 0;
 	file->private_data = sock;
 
 	return 0;
 }
 
-int sock_map_fd(struct socket *sock)
+int sock_map_fd(struct socket *sock, int flags)
 {
 	struct file *newfile;
-	int fd = sock_alloc_fd(&newfile);
+	int fd = sock_alloc_fd(&newfile, flags);
 
 	if (likely(fd >= 0)) {
-		int err = sock_attach_fd(sock, newfile);
+		int err = sock_attach_fd(sock, newfile, flags);
 
 		if (unlikely(err < 0)) {
 			put_filp(newfile);
@@ -1218,12 +1220,27 @@ asmlinkage long sys_socket(int family, int type, int protocol)
 {
 	int retval;
 	struct socket *sock;
+	int flags;
+
+	/* Check the SOCK_* constants for consistency.  */
+	BUILD_BUG_ON(SOCK_CLOEXEC != O_CLOEXEC);
+	BUILD_BUG_ON((SOCK_MAX | SOCK_TYPE_MASK) != SOCK_TYPE_MASK);
+	BUILD_BUG_ON(SOCK_CLOEXEC & SOCK_TYPE_MASK);
+	BUILD_BUG_ON(SOCK_NONBLOCK & SOCK_TYPE_MASK);
+
+	flags = type & ~SOCK_TYPE_MASK;
+	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
+		return -EINVAL;
+	type &= SOCK_TYPE_MASK;
+
+	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
+		flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
 
 	retval = sock_create(family, type, protocol, &sock);
 	if (retval < 0)
 		goto out;
 
-	retval = sock_map_fd(sock);
+	retval = sock_map_fd(sock, flags & (O_CLOEXEC | O_NONBLOCK));
 	if (retval < 0)
 		goto out_release;
 
@@ -1246,6 +1263,15 @@ asmlinkage long sys_socketpair(int family, int type, int protocol,
 	struct socket *sock1, *sock2;
 	int fd1, fd2, err;
 	struct file *newfile1, *newfile2;
+	int flags;
+
+	flags = type & ~SOCK_TYPE_MASK;
+	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
+		return -EINVAL;
+	type &= SOCK_TYPE_MASK;
+
+	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
+		flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
 
 	/*
 	 * Obtain the first socket and check if the underlying protocol
@@ -1264,13 +1290,13 @@ asmlinkage long sys_socketpair(int family, int type, int protocol,
 	if (err < 0)
 		goto out_release_both;
 
-	fd1 = sock_alloc_fd(&newfile1);
+	fd1 = sock_alloc_fd(&newfile1, flags & O_CLOEXEC);
 	if (unlikely(fd1 < 0)) {
 		err = fd1;
 		goto out_release_both;
 	}
 
-	fd2 = sock_alloc_fd(&newfile2);
+	fd2 = sock_alloc_fd(&newfile2, flags & O_CLOEXEC);
 	if (unlikely(fd2 < 0)) {
 		err = fd2;
 		put_filp(newfile1);
@@ -1278,12 +1304,12 @@ asmlinkage long sys_socketpair(int family, int type, int protocol,
 		goto out_release_both;
 	}
 
-	err = sock_attach_fd(sock1, newfile1);
+	err = sock_attach_fd(sock1, newfile1, flags & O_NONBLOCK);
 	if (unlikely(err < 0)) {
 		goto out_fd2;
 	}
 
-	err = sock_attach_fd(sock2, newfile2);
+	err = sock_attach_fd(sock2, newfile2, flags & O_NONBLOCK);
 	if (unlikely(err < 0)) {
 		fput(newfile1);
 		goto out_fd1;
@@ -1401,14 +1427,20 @@ asmlinkage long sys_listen(int fd, int backlog)
  *	clean when we restucture accept also.
  */
 
-asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr,
-			   int __user *upeer_addrlen)
+long do_accept(int fd, struct sockaddr __user *upeer_sockaddr,
+	       int __user *upeer_addrlen, int flags)
 {
 	struct socket *sock, *newsock;
 	struct file *newfile;
 	int err, len, newfd, fput_needed;
 	struct sockaddr_storage address;
 
+	if (flags & ~(SOCK_CLOEXEC | SOCK_NONBLOCK))
+		return -EINVAL;
+
+	if (SOCK_NONBLOCK != O_NONBLOCK && (flags & SOCK_NONBLOCK))
+		flags = (flags & ~SOCK_NONBLOCK) | O_NONBLOCK;
+
 	sock = sockfd_lookup_light(fd, &err, &fput_needed);
 	if (!sock)
 		goto out;
@@ -1426,14 +1458,14 @@ asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr,
 	 */
 	__module_get(newsock->ops->owner);
 
-	newfd = sock_alloc_fd(&newfile);
+	newfd = sock_alloc_fd(&newfile, flags & O_CLOEXEC);
 	if (unlikely(newfd < 0)) {
 		err = newfd;
 		sock_release(newsock);
 		goto out_put;
 	}
 
-	err = sock_attach_fd(newsock, newfile);
+	err = sock_attach_fd(newsock, newfile, flags & O_NONBLOCK);
 	if (err < 0)
 		goto out_fd_simple;
 
@@ -1479,6 +1511,66 @@ out_fd:
 	goto out_put;
 }
 
+#ifdef HAVE_SET_RESTORE_SIGMASK
+asmlinkage long sys_paccept(int fd, struct sockaddr __user *upeer_sockaddr,
+			    int __user *upeer_addrlen,
+			    const sigset_t __user *sigmask,
+			    size_t sigsetsize, int flags)
+{
+	sigset_t ksigmask, sigsaved;
+	int ret;
+
+	if (sigmask) {
+		/* XXX: Don't preclude handling different sized sigset_t's.  */
+		if (sigsetsize != sizeof(sigset_t))
+			return -EINVAL;
+		if (copy_from_user(&ksigmask, sigmask, sizeof(ksigmask)))
+			return -EFAULT;
+
+		sigdelsetmask(&ksigmask, sigmask(SIGKILL)|sigmask(SIGSTOP));
+		sigprocmask(SIG_SETMASK, &ksigmask, &sigsaved);
+        }
+
+	ret = do_accept(fd, upeer_sockaddr, upeer_addrlen, flags);
+
+	if (ret < 0 && signal_pending(current)) {
+		/*
+		 * Don't restore the signal mask yet. Let do_signal() deliver
+		 * the signal on the way back to userspace, before the signal
+		 * mask is restored.
+		 */
+		if (sigmask) {
+			memcpy(&current->saved_sigmask, &sigsaved,
+			       sizeof(sigsaved));
+			set_restore_sigmask();
+		}
+	} else if (sigmask)
+		sigprocmask(SIG_SETMASK, &sigsaved, NULL);
+
+	return ret;
+}
+#else
+asmlinkage long sys_paccept(int fd, struct sockaddr __user *upeer_sockaddr,
+			    int __user *upeer_addrlen,
+			    const sigset_t __user *sigmask,
+			    size_t sigsetsize, int flags)
+{
+	/* The platform does not support restoring the signal mask in the
+	 * return path.  So we do not allow using paccept() with a signal
+	 * mask.  */
+	if (sigmask)
+		return -EINVAL;
+
+	return do_accept(fd, upeer_sockaddr, upeer_addrlen, flags);
+}
+#endif
+
+asmlinkage long sys_accept(int fd, struct sockaddr __user *upeer_sockaddr,
+			   int __user *upeer_addrlen)
+{
+	return do_accept(fd, upeer_sockaddr, upeer_addrlen, 0);
+}
+
 /*
  *	Attempt to connect to a socket with the server address.  The address
  *	is in user space so we verify it is OK and move it to kernel space.
@@ -1999,10 +2091,11 @@ out:
 
 /* Argument list sizes for sys_socketcall */
 #define AL(x) ((x) * sizeof(unsigned long))
-static const unsigned char nargs[18]={
+static const unsigned char nargs[19]={
 	AL(0),AL(3),AL(3),AL(3),AL(2),AL(3),
 	AL(3),AL(3),AL(4),AL(4),AL(4),AL(6),
-	AL(6),AL(2),AL(5),AL(5),AL(3),AL(3)
+	AL(6),AL(2),AL(5),AL(5),AL(3),AL(3),
+	AL(6)
 };
 
 #undef AL
@@ -2021,7 +2114,7 @@ asmlinkage long sys_socketcall(int call, unsigned long __user *args)
 	unsigned long a0, a1;
 	int err;
 
-	if (call < 1 || call > SYS_RECVMSG)
+	if (call < 1 || call > SYS_PACCEPT)
 		return -EINVAL;
 
 	/* copy_from_user should be SMP safe. */
@@ -2050,8 +2143,8 @@ asmlinkage long sys_socketcall(int call, unsigned long __user *args)
 		break;
 	case SYS_ACCEPT:
 		err =
-		    sys_accept(a0, (struct sockaddr __user *)a1,
-			       (int __user *)a[2]);
+		    do_accept(a0, (struct sockaddr __user *)a1,
+			      (int __user *)a[2], 0);
 		break;
 	case SYS_GETSOCKNAME:
 		err =
@@ -2098,6 +2191,13 @@ asmlinkage long sys_socketcall(int call, unsigned long __user *args)
 	case SYS_RECVMSG:
 		err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
 		break;
+	case SYS_PACCEPT:
+		err =
+		    sys_paccept(a0, (struct sockaddr __user *)a1,
+			        (int __user *)a[2],
+				(const sigset_t __user *) a[3],
+				a[4], a[5]);
+		break;
 	default:
 		err = -EINVAL;
 		break;