net: separate out the msghdr copy from ___sys_{send,recv}msg()
This is in preparation for enabling the io_uring helpers for sendmsg and recvmsg to first copy the header for validation before continuing with the operation. There should be no functional changes in this patch. Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: Jens Axboe <axboe@kernel.dk>alistair/sunxi64-5.5-dsi
Jens Axboe
parent
8042d6ce8c
commit
4257c8ca13
141
net/socket.c
141
net/socket.c
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@ -2264,15 +2264,10 @@ static int copy_msghdr_from_user(struct msghdr *kmsg,
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return err < 0 ? err : 0;
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}
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static int ___sys_sendmsg(struct socket *sock, struct user_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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unsigned int allowed_msghdr_flags)
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static int ____sys_sendmsg(struct socket *sock, struct msghdr *msg_sys,
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unsigned int flags, struct used_address *used_address,
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unsigned int allowed_msghdr_flags)
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{
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struct compat_msghdr __user *msg_compat =
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(struct compat_msghdr __user *)msg;
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struct sockaddr_storage address;
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struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
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unsigned char ctl[sizeof(struct cmsghdr) + 20]
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__aligned(sizeof(__kernel_size_t));
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/* 20 is size of ipv6_pktinfo */
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@ -2280,19 +2275,10 @@ static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
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int ctl_len;
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ssize_t err;
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msg_sys->msg_name = &address;
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if (MSG_CMSG_COMPAT & flags)
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err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov);
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else
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err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov);
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if (err < 0)
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return err;
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err = -ENOBUFS;
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if (msg_sys->msg_controllen > INT_MAX)
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goto out_freeiov;
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goto out;
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flags |= (msg_sys->msg_flags & allowed_msghdr_flags);
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ctl_len = msg_sys->msg_controllen;
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if ((MSG_CMSG_COMPAT & flags) && ctl_len) {
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@ -2300,7 +2286,7 @@ static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
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cmsghdr_from_user_compat_to_kern(msg_sys, sock->sk, ctl,
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sizeof(ctl));
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if (err)
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goto out_freeiov;
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goto out;
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ctl_buf = msg_sys->msg_control;
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ctl_len = msg_sys->msg_controllen;
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} else if (ctl_len) {
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@ -2309,7 +2295,7 @@ static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
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if (ctl_len > sizeof(ctl)) {
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ctl_buf = sock_kmalloc(sock->sk, ctl_len, GFP_KERNEL);
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if (ctl_buf == NULL)
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goto out_freeiov;
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goto out;
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}
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err = -EFAULT;
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/*
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@ -2355,7 +2341,47 @@ static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
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out_freectl:
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if (ctl_buf != ctl)
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sock_kfree_s(sock->sk, ctl_buf, ctl_len);
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out_freeiov:
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out:
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return err;
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}
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static int sendmsg_copy_msghdr(struct msghdr *msg,
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struct user_msghdr __user *umsg, unsigned flags,
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struct iovec **iov)
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{
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int err;
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if (flags & MSG_CMSG_COMPAT) {
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struct compat_msghdr __user *msg_compat;
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msg_compat = (struct compat_msghdr __user *) umsg;
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err = get_compat_msghdr(msg, msg_compat, NULL, iov);
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} else {
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err = copy_msghdr_from_user(msg, umsg, NULL, iov);
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}
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if (err < 0)
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return err;
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return 0;
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}
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static int ___sys_sendmsg(struct socket *sock, struct user_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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unsigned int allowed_msghdr_flags)
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{
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struct sockaddr_storage address;
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struct iovec iovstack[UIO_FASTIOV], *iov = iovstack;
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ssize_t err;
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msg_sys->msg_name = &address;
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err = sendmsg_copy_msghdr(msg_sys, msg, flags, &iov);
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if (err < 0)
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return err;
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err = ____sys_sendmsg(sock, msg_sys, flags, used_address,
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allowed_msghdr_flags);
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kfree(iov);
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return err;
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}
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@ -2474,33 +2500,41 @@ SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
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return __sys_sendmmsg(fd, mmsg, vlen, flags, true);
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}
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static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
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struct msghdr *msg_sys, unsigned int flags, int nosec)
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static int recvmsg_copy_msghdr(struct msghdr *msg,
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struct user_msghdr __user *umsg, unsigned flags,
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struct sockaddr __user **uaddr,
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struct iovec **iov)
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{
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ssize_t err;
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if (MSG_CMSG_COMPAT & flags) {
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struct compat_msghdr __user *msg_compat;
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msg_compat = (struct compat_msghdr __user *) umsg;
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err = get_compat_msghdr(msg, msg_compat, uaddr, iov);
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} else {
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err = copy_msghdr_from_user(msg, umsg, uaddr, iov);
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}
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if (err < 0)
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return err;
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return 0;
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}
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static int ____sys_recvmsg(struct socket *sock, struct msghdr *msg_sys,
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struct user_msghdr __user *msg,
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struct sockaddr __user *uaddr,
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unsigned int flags, int nosec)
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{
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struct compat_msghdr __user *msg_compat =
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(struct compat_msghdr __user *)msg;
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struct iovec iovstack[UIO_FASTIOV];
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struct iovec *iov = iovstack;
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(struct compat_msghdr __user *) msg;
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int __user *uaddr_len = COMPAT_NAMELEN(msg);
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struct sockaddr_storage addr;
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unsigned long cmsg_ptr;
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int len;
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ssize_t err;
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/* kernel mode address */
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struct sockaddr_storage addr;
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/* user mode address pointers */
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struct sockaddr __user *uaddr;
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int __user *uaddr_len = COMPAT_NAMELEN(msg);
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msg_sys->msg_name = &addr;
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if (MSG_CMSG_COMPAT & flags)
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err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov);
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else
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err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov);
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if (err < 0)
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return err;
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cmsg_ptr = (unsigned long)msg_sys->msg_control;
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msg_sys->msg_flags = flags & (MSG_CMSG_CLOEXEC|MSG_CMSG_COMPAT);
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@ -2511,7 +2545,7 @@ static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
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flags |= MSG_DONTWAIT;
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err = (nosec ? sock_recvmsg_nosec : sock_recvmsg)(sock, msg_sys, flags);
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if (err < 0)
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goto out_freeiov;
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goto out;
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len = err;
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if (uaddr != NULL) {
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@ -2519,12 +2553,12 @@ static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
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msg_sys->msg_namelen, uaddr,
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uaddr_len);
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if (err < 0)
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goto out_freeiov;
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goto out;
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}
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err = __put_user((msg_sys->msg_flags & ~MSG_CMSG_COMPAT),
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COMPAT_FLAGS(msg));
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if (err)
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goto out_freeiov;
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goto out;
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if (MSG_CMSG_COMPAT & flags)
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err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
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&msg_compat->msg_controllen);
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@ -2532,10 +2566,25 @@ static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
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err = __put_user((unsigned long)msg_sys->msg_control - cmsg_ptr,
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&msg->msg_controllen);
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if (err)
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goto out_freeiov;
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goto out;
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err = len;
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out:
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return err;
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}
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out_freeiov:
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static int ___sys_recvmsg(struct socket *sock, struct user_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 iovec iovstack[UIO_FASTIOV], *iov = iovstack;
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/* user mode address pointers */
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struct sockaddr __user *uaddr;
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ssize_t err;
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err = recvmsg_copy_msghdr(msg_sys, msg, flags, &uaddr, &iov);
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if (err < 0)
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return err;
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err = ____sys_recvmsg(sock, msg_sys, msg, uaddr, flags, nosec);
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kfree(iov);
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return err;
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}
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