linux-kernel - [PATCH -next 06/22] net: socket: add __sys_connect() helper; remove in-kernel call to syscall

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20180316170614.5392-7-linux@dominikbrodowski.net>
Date:   Fri, 16 Mar 2018 18:05:58 +0100
From:   Dominik Brodowski <linux@...inikbrodowski.net>
To:     linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        davem@...emloft.net
Cc:     netdev@...r.kernel.org
Subject: [PATCH -next 06/22] net: socket: add __sys_connect() helper; remove in-kernel call to syscall

Using the net-internal helper __sys_connect() allows us to avoid the
internal calls to the sys_connect() syscall.

Cc: David S. Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org
Signed-off-by: Dominik Brodowski <linux@...inikbrodowski.net>
---
 include/linux/socket.h |  2 ++
 net/compat.c           |  2 +-
 net/socket.c           | 11 ++++++++---
 3 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/include/linux/socket.h b/include/linux/socket.h
index e9cee272da13..7daa344d7320 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -365,5 +365,7 @@ extern int __sys_accept4(int fd, struct sockaddr __user *upeer_sockaddr,
 			 int __user *upeer_addrlen, int flags);
 extern int __sys_socket(int family, int type, int protocol);
 extern int __sys_bind(int fd, struct sockaddr __user *umyaddr, int addrlen);
+extern int __sys_connect(int fd, struct sockaddr __user *uservaddr,
+			 int addrlen);
 
 #endif /* _LINUX_SOCKET_H */
diff --git a/net/compat.c b/net/compat.c
index bba555b1d863..7ab6352268f3 100644
--- a/net/compat.c
+++ b/net/compat.c
@@ -817,7 +817,7 @@ COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
 		ret = __sys_bind(a0, compat_ptr(a1), a[2]);
 		break;
 	case SYS_CONNECT:
-		ret = sys_connect(a0, compat_ptr(a1), a[2]);
+		ret = __sys_connect(a0, compat_ptr(a1), a[2]);
 		break;
 	case SYS_LISTEN:
 		ret = sys_listen(a0, a1);
diff --git a/net/socket.c b/net/socket.c
index 291cdae97341..64bdfdf6c6e7 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1633,8 +1633,7 @@ SYSCALL_DEFINE3(accept, int, fd, struct sockaddr __user *, upeer_sockaddr,
  *	include the -EINPROGRESS status for such sockets.
  */
 
-SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
-		int, addrlen)
+int __sys_connect(int fd, struct sockaddr __user *uservaddr, int addrlen)
 {
 	struct socket *sock;
 	struct sockaddr_storage address;
@@ -1660,6 +1659,12 @@ SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
 	return err;
 }
 
+SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
+		int, addrlen)
+{
+	return __sys_connect(fd, uservaddr, addrlen);
+}
+
 /*
  *	Get the local address ('name') of a socket object. Move the obtained
  *	name to user space.
@@ -2479,7 +2484,7 @@ SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
 		err = __sys_bind(a0, (struct sockaddr __user *)a1, a[2]);
 		break;
 	case SYS_CONNECT:
-		err = sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
+		err = __sys_connect(a0, (struct sockaddr __user *)a1, a[2]);
 		break;
 	case SYS_LISTEN:
 		err = sys_listen(a0, a1);
-- 
2.16.2