net: Unbreak compat_sys_{send,recv}msg
I broke them in this commit:
commit 1be374a051
Author: Andy Lutomirski <luto@amacapital.net>
Date: Wed May 22 14:07:44 2013 -0700
net: Block MSG_CMSG_COMPAT in send(m)msg and recv(m)msg
This patch adds __sys_sendmsg and __sys_sendmsg as common helpers that accept
MSG_CMSG_COMPAT and blocks MSG_CMSG_COMPAT at the syscall entrypoints. It
also reverts some unnecessary checks in sys_socketcall.
Apparently I was suffering from underscore blindness the first time around.
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Tested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andy Lutomirski
David S. Miller
parent
4d3797d7e1
commit
a7526eb5d0
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@ -320,6 +320,9 @@ extern int put_cmsg(struct msghdr*, int level, int type, int len, void *data);
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struct timespec;
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/* The __sys_...msg variants allow MSG_CMSG_COMPAT */
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extern long __sys_recvmsg(int fd, struct msghdr __user *msg, unsigned flags);
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extern long __sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags);
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extern int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
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unsigned int flags, struct timespec *timeout);
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extern int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg,
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13
net/compat.c
13
net/compat.c
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@ -734,19 +734,25 @@ static unsigned char nas[21] = {
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asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
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{
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return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
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if (flags & MSG_CMSG_COMPAT)
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return -EINVAL;
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return __sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
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}
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asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
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unsigned int vlen, unsigned int flags)
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{
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if (flags & MSG_CMSG_COMPAT)
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return -EINVAL;
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return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
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flags | MSG_CMSG_COMPAT);
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}
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asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
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{
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return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
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if (flags & MSG_CMSG_COMPAT)
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return -EINVAL;
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return __sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
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}
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asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned int flags)
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@ -768,6 +774,9 @@ asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
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int datagrams;
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struct timespec ktspec;
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if (flags & MSG_CMSG_COMPAT)
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return -EINVAL;
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if (COMPAT_USE_64BIT_TIME)
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return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
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flags | MSG_CMSG_COMPAT,
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72
net/socket.c
72
net/socket.c
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@ -1956,7 +1956,7 @@ struct used_address {
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unsigned int name_len;
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};
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static int __sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
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static int ___sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
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struct msghdr *msg_sys, unsigned int flags,
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struct used_address *used_address)
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{
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@ -2071,26 +2071,30 @@ out:
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* BSD sendmsg interface
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*/
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SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned int, flags)
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long __sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
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{
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int fput_needed, err;
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struct msghdr msg_sys;
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struct socket *sock;
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if (flags & MSG_CMSG_COMPAT)
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return -EINVAL;
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sock = sockfd_lookup_light(fd, &err, &fput_needed);
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if (!sock)
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goto out;
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err = __sys_sendmsg(sock, msg, &msg_sys, flags, NULL);
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err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL);
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fput_light(sock->file, fput_needed);
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out:
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return err;
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}
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SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned int, flags)
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{
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if (flags & MSG_CMSG_COMPAT)
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return -EINVAL;
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return __sys_sendmsg(fd, msg, flags);
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}
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/*
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* Linux sendmmsg interface
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*/
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@ -2121,15 +2125,16 @@ int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
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while (datagrams < vlen) {
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if (MSG_CMSG_COMPAT & flags) {
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err = __sys_sendmsg(sock, (struct msghdr __user *)compat_entry,
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&msg_sys, flags, &used_address);
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err = ___sys_sendmsg(sock, (struct msghdr __user *)compat_entry,
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&msg_sys, flags, &used_address);
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if (err < 0)
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break;
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err = __put_user(err, &compat_entry->msg_len);
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++compat_entry;
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} else {
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err = __sys_sendmsg(sock, (struct msghdr __user *)entry,
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&msg_sys, flags, &used_address);
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err = ___sys_sendmsg(sock,
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(struct msghdr __user *)entry,
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&msg_sys, flags, &used_address);
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if (err < 0)
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break;
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err = put_user(err, &entry->msg_len);
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@ -2158,7 +2163,7 @@ SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
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return __sys_sendmmsg(fd, mmsg, vlen, flags);
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}
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static int __sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
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static int ___sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
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struct msghdr *msg_sys, unsigned int flags, int nosec)
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{
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struct compat_msghdr __user *msg_compat =
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@ -2250,27 +2255,31 @@ out:
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* BSD recvmsg interface
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*/
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SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
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unsigned int, flags)
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long __sys_recvmsg(int fd, struct msghdr __user *msg, unsigned flags)
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{
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int fput_needed, err;
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struct msghdr msg_sys;
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struct socket *sock;
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if (flags & MSG_CMSG_COMPAT)
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return -EINVAL;
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sock = sockfd_lookup_light(fd, &err, &fput_needed);
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if (!sock)
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goto out;
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err = __sys_recvmsg(sock, msg, &msg_sys, flags, 0);
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err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
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fput_light(sock->file, fput_needed);
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out:
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return err;
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}
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SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
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unsigned int, flags)
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{
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if (flags & MSG_CMSG_COMPAT)
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return -EINVAL;
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return __sys_recvmsg(fd, msg, flags);
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}
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/*
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* Linux recvmmsg interface
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*/
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@ -2308,17 +2317,18 @@ int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
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* No need to ask LSM for more than the first datagram.
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*/
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if (MSG_CMSG_COMPAT & flags) {
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err = __sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
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&msg_sys, flags & ~MSG_WAITFORONE,
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datagrams);
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err = ___sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
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&msg_sys, flags & ~MSG_WAITFORONE,
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datagrams);
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if (err < 0)
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break;
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err = __put_user(err, &compat_entry->msg_len);
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++compat_entry;
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} else {
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err = __sys_recvmsg(sock, (struct msghdr __user *)entry,
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&msg_sys, flags & ~MSG_WAITFORONE,
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datagrams);
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err = ___sys_recvmsg(sock,
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(struct msghdr __user *)entry,
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&msg_sys, flags & ~MSG_WAITFORONE,
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datagrams);
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if (err < 0)
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break;
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err = put_user(err, &entry->msg_len);
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@ -2505,31 +2515,15 @@ SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
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(int __user *)a[4]);
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break;
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case SYS_SENDMSG:
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if (a[2] & MSG_CMSG_COMPAT) {
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err = -EINVAL;
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break;
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}
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err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
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break;
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case SYS_SENDMMSG:
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if (a[3] & MSG_CMSG_COMPAT) {
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err = -EINVAL;
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break;
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}
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err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
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break;
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case SYS_RECVMSG:
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if (a[2] & MSG_CMSG_COMPAT) {
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err = -EINVAL;
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break;
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}
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err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
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break;
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case SYS_RECVMMSG:
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if (a[3] & MSG_CMSG_COMPAT) {
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err = -EINVAL;
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break;
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}
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err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
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(struct timespec __user *)a[4]);
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break;
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