From 409495415c30e573bcdc4c9fb90825b7fc9c8fca Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Thu, 15 Apr 2021 17:34:18 +0800 Subject: [PATCH] net: disallow ancillary data for __sys_{send,recv}msg_file() mainline inclusion from mainline-5.5-rc1 commit d69e07793f891524c6bbf1e75b9ae69db4450953 category: feature bugzilla: https://bugzilla.openeuler.org/show_bug.cgi?id=27 CVE: NA --------------------------- Only io_uring uses (and added) these, and we want to disallow the use of sendmsg/recvmsg for anything but regular data transfers. Use the newly added prep helper to split the msghdr copy out from the core function, to check for msg_control and msg_controllen settings. If either is set, we return -EINVAL. Acked-by: David S. Miller Signed-off-by: Jens Axboe Signed-off-by: yangerkun Reviewed-by: zhangyi (F) Signed-off-by: Cheng Jian --- net/socket.c | 43 +++++++++++++++++++++++++++++++++++++------ 1 file changed, 37 insertions(+), 6 deletions(-) diff --git a/net/socket.c b/net/socket.c index b4fd9c96e2ed..b3ffa502d62a 100644 --- a/net/socket.c +++ b/net/socket.c @@ -2193,12 +2193,27 @@ static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg, /* * BSD sendmsg interface */ -long __sys_sendmsg_sock(struct socket *sock, struct user_msghdr __user *msg, +long __sys_sendmsg_sock(struct socket *sock, struct user_msghdr __user *umsg, unsigned int flags) { - struct msghdr msg_sys; + struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; + struct sockaddr_storage address; + struct msghdr msg = { .msg_name = &address }; + ssize_t err; + + err = sendmsg_copy_msghdr(&msg, umsg, flags, &iov); + if (err) + return err; + /* disallow ancillary data requests from this path */ + if (msg.msg_control || msg.msg_controllen) { + err = -EINVAL; + goto out; + } - return ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL, 0); + err = ____sys_sendmsg(sock, &msg, flags, NULL, 0); +out: + kfree(iov); + return err; } long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, @@ -2397,12 +2412,28 @@ static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg, * BSD recvmsg interface */ -long __sys_recvmsg_sock(struct socket *sock, struct user_msghdr __user *msg, +long __sys_recvmsg_sock(struct socket *sock, struct user_msghdr __user *umsg, unsigned int flags) { - struct msghdr msg_sys; + struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; + struct sockaddr_storage address; + struct msghdr msg = { .msg_name = &address }; + struct sockaddr __user *uaddr; + ssize_t err; - return ___sys_recvmsg(sock, msg, &msg_sys, flags, 0); + err = recvmsg_copy_msghdr(&msg, umsg, flags, &uaddr, &iov); + if (err) + return err; + /* disallow ancillary data requests from this path */ + if (msg.msg_control || msg.msg_controllen) { + err = -EINVAL; + goto out; + } + + err = ____sys_recvmsg(sock, &msg, umsg, uaddr, flags, 0); +out: + kfree(iov); + return err; } long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned int flags, -- GitLab