1 files changed, 76 insertions, 11 deletions

diff --git a/net/socket.c b/net/socket.c
index 38a1431..d92c490 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -88,6 +88,7 @@
 #include <linux/nsproxy.h>
 #include <linux/magic.h>
 #include <linux/slab.h>
+#include <linux/xattr.h>
 
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
@@ -346,12 +347,19 @@ static struct file_system_type sock_fs_type = {
  *	but we take care of internal coherence yet.
  */
 
-struct file *sock_alloc_file(struct socket *sock, int flags)
+struct file *sock_alloc_file(struct socket *sock, int flags, const char *dname)
 {
 	struct qstr name = { .name = "" };
 	struct path path;
 	struct file *file;
 
+	if (dname) {
+		name.name = dname;
+		name.len = strlen(name.name);
+	} else if (sock->sk) {
+		name.name = sock->sk->sk_prot_creator->name;
+		name.len = strlen(name.name);
+	}
 	path.dentry = d_alloc_pseudo(sock_mnt->mnt_sb, &name);
 	if (unlikely(!path.dentry))
 		return ERR_PTR(-ENOMEM);
@@ -384,7 +392,7 @@ static int sock_map_fd(struct socket *sock, int flags)
 	if (unlikely(fd < 0))
 		return fd;
 
-	newfile = sock_alloc_file(sock, flags);
+	newfile = sock_alloc_file(sock, flags, NULL);
 	if (likely(!IS_ERR(newfile))) {
 		fd_install(fd, newfile);
 		return fd;
@@ -451,6 +459,68 @@ static struct socket *sockfd_lookup_light(int fd, int *err, int *fput_needed)
 	return NULL;
 }
 
+#define XATTR_SOCKPROTONAME_SUFFIX "sockprotoname"
+#define XATTR_NAME_SOCKPROTONAME (XATTR_SYSTEM_PREFIX XATTR_SOCKPROTONAME_SUFFIX)
+#define XATTR_NAME_SOCKPROTONAME_LEN (sizeof(XATTR_NAME_SOCKPROTONAME)-1)
+static ssize_t sockfs_getxattr(struct dentry *dentry,
+			       const char *name, void *value, size_t size)
+{
+	const char *proto_name;
+	size_t proto_size;
+	int error;
+
+	error = -ENODATA;
+	if (!strncmp(name, XATTR_NAME_SOCKPROTONAME, XATTR_NAME_SOCKPROTONAME_LEN)) {
+		proto_name = dentry->d_name.name;
+		proto_size = strlen(proto_name);
+
+		if (value) {
+			error = -ERANGE;
+			if (proto_size + 1 > size)
+				goto out;
+
+			strncpy(value, proto_name, proto_size + 1);
+		}
+		error = proto_size + 1;
+	}
+
+out:
+	return error;
+}
+
+static ssize_t sockfs_listxattr(struct dentry *dentry, char *buffer,
+				size_t size)
+{
+	ssize_t len;
+	ssize_t used = 0;
+
+	len = security_inode_listsecurity(dentry->d_inode, buffer, size);
+	if (len < 0)
+		return len;
+	used += len;
+	if (buffer) {
+		if (size < used)
+			return -ERANGE;
+		buffer += len;
+	}
+
+	len = (XATTR_NAME_SOCKPROTONAME_LEN + 1);
+	used += len;
+	if (buffer) {
+		if (size < used)
+			return -ERANGE;
+		memcpy(buffer, XATTR_NAME_SOCKPROTONAME, len);
+		buffer += len;
+	}
+
+	return used;
+}
+
+static const struct inode_operations sockfs_inode_ops = {
+	.getxattr = sockfs_getxattr,
+	.listxattr = sockfs_listxattr,
+};
+
 /**
  *	sock_alloc	-	allocate a socket
  *
@@ -475,6 +545,7 @@ static struct socket *sock_alloc(void)
 	inode->i_mode = S_IFSOCK | S_IRWXUGO;
 	inode->i_uid = current_fsuid();
 	inode->i_gid = current_fsgid();
+	inode->i_op = &sockfs_inode_ops;
 
 	this_cpu_add(sockets_in_use, 1);
 	return sock;
@@ -1402,7 +1473,7 @@ SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
 		goto out_release_both;
 	}
 
-	newfile1 = sock_alloc_file(sock1, flags);
+	newfile1 = sock_alloc_file(sock1, flags, NULL);
 	if (unlikely(IS_ERR(newfile1))) {
 		err = PTR_ERR(newfile1);
 		put_unused_fd(fd1);
@@ -1410,7 +1481,7 @@ SYSCALL_DEFINE4(socketpair, int, family, int, type, int, protocol,
 		goto out_release_both;
 	}
 
-	newfile2 = sock_alloc_file(sock2, flags);
+	newfile2 = sock_alloc_file(sock2, flags, NULL);
 	if (IS_ERR(newfile2)) {
 		err = PTR_ERR(newfile2);
 		fput(newfile1);
@@ -1553,7 +1624,7 @@ SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
 		sock_release(newsock);
 		goto out_put;
 	}
-	newfile = sock_alloc_file(newsock, flags);
+	newfile = sock_alloc_file(newsock, flags, sock->sk->sk_prot_creator->name);
 	if (unlikely(IS_ERR(newfile))) {
 		err = PTR_ERR(newfile);
 		put_unused_fd(newfd);
@@ -2546,12 +2617,6 @@ static int __init sock_init(void)
 		goto out;
 
 	/*
-	 *      Initialize sock SLAB cache.
-	 */
-
-	sk_init();
-
-	/*
 	 *      Initialize skbuff SLAB cache
 	 */
 	skb_init();