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Message-ID: <20220708184358.1624275-2-dylany@fb.com>
Date: Fri, 8 Jul 2022 11:43:55 -0700
From: Dylan Yudaken <dylany@...com>
To: Jens Axboe <axboe@...nel.dk>,
Pavel Begunkov <asml.silence@...il.com>, <davem@...emloft.net>,
<edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
<io-uring@...r.kernel.org>
CC: <netdev@...r.kernel.org>, <Kernel-team@...com>,
Dylan Yudaken <dylany@...com>
Subject: [PATCH for-next 1/3] net: copy from user before calling __copy_msghdr
this is in preparation for multishot receive from io_uring, where it needs
to have access to the original struct user_msghdr.
functionally this should be a no-op.
Signed-off-by: Dylan Yudaken <dylany@...com>
---
include/linux/socket.h | 7 +++----
io_uring/net.c | 17 +++++++++--------
net/socket.c | 37 ++++++++++++++++---------------------
3 files changed, 28 insertions(+), 33 deletions(-)
diff --git a/include/linux/socket.h b/include/linux/socket.h
index 17311ad9f9af..be24f1c8568a 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -416,10 +416,9 @@ extern int recvmsg_copy_msghdr(struct msghdr *msg,
struct user_msghdr __user *umsg, unsigned flags,
struct sockaddr __user **uaddr,
struct iovec **iov);
-extern int __copy_msghdr_from_user(struct msghdr *kmsg,
- struct user_msghdr __user *umsg,
- struct sockaddr __user **save_addr,
- struct iovec __user **uiov, size_t *nsegs);
+extern int __copy_msghdr(struct msghdr *kmsg,
+ struct user_msghdr *umsg,
+ struct sockaddr __user **save_addr);
/* helpers which do the actual work for syscalls */
extern int __sys_recvfrom(int fd, void __user *ubuf, size_t size,
diff --git a/io_uring/net.c b/io_uring/net.c
index c1cbafe96c63..99fb878afd65 100644
--- a/io_uring/net.c
+++ b/io_uring/net.c
@@ -330,31 +330,32 @@ static int __io_recvmsg_copy_hdr(struct io_kiocb *req,
struct io_async_msghdr *iomsg)
{
struct io_sr_msg *sr = io_kiocb_to_cmd(req);
- struct iovec __user *uiov;
- size_t iov_len;
+ struct user_msghdr msg;
int ret;
- ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg,
- &iomsg->uaddr, &uiov, &iov_len);
+ if (copy_from_user(&msg, sr->umsg, sizeof(*sr->umsg)))
+ return -EFAULT;
+
+ ret = __copy_msghdr(&iomsg->msg, &msg, &iomsg->uaddr);
if (ret)
return ret;
if (req->flags & REQ_F_BUFFER_SELECT) {
- if (iov_len == 0) {
+ if (msg.msg_iovlen == 0) {
sr->len = iomsg->fast_iov[0].iov_len = 0;
iomsg->fast_iov[0].iov_base = NULL;
iomsg->free_iov = NULL;
- } else if (iov_len > 1) {
+ } else if (msg.msg_iovlen > 1) {
return -EINVAL;
} else {
- if (copy_from_user(iomsg->fast_iov, uiov, sizeof(*uiov)))
+ if (copy_from_user(iomsg->fast_iov, msg.msg_iov, sizeof(*msg.msg_iov)))
return -EFAULT;
sr->len = iomsg->fast_iov[0].iov_len;
iomsg->free_iov = NULL;
}
} else {
iomsg->free_iov = iomsg->fast_iov;
- ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV,
+ ret = __import_iovec(READ, msg.msg_iov, msg.msg_iovlen, UIO_FASTIOV,
&iomsg->free_iov, &iomsg->msg.msg_iter,
false);
if (ret > 0)
diff --git a/net/socket.c b/net/socket.c
index 96300cdc0625..843545c21ec2 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -2358,25 +2358,20 @@ struct used_address {
unsigned int name_len;
};
-int __copy_msghdr_from_user(struct msghdr *kmsg,
- struct user_msghdr __user *umsg,
- struct sockaddr __user **save_addr,
- struct iovec __user **uiov, size_t *nsegs)
+int __copy_msghdr(struct msghdr *kmsg,
+ struct user_msghdr *msg,
+ struct sockaddr __user **save_addr)
{
- struct user_msghdr msg;
ssize_t err;
- if (copy_from_user(&msg, umsg, sizeof(*umsg)))
- return -EFAULT;
-
kmsg->msg_control_is_user = true;
kmsg->msg_get_inq = 0;
- kmsg->msg_control_user = msg.msg_control;
- kmsg->msg_controllen = msg.msg_controllen;
- kmsg->msg_flags = msg.msg_flags;
+ kmsg->msg_control_user = msg->msg_control;
+ kmsg->msg_controllen = msg->msg_controllen;
+ kmsg->msg_flags = msg->msg_flags;
- kmsg->msg_namelen = msg.msg_namelen;
- if (!msg.msg_name)
+ kmsg->msg_namelen = msg->msg_namelen;
+ if (!msg->msg_name)
kmsg->msg_namelen = 0;
if (kmsg->msg_namelen < 0)
@@ -2386,11 +2381,11 @@ int __copy_msghdr_from_user(struct msghdr *kmsg,
kmsg->msg_namelen = sizeof(struct sockaddr_storage);
if (save_addr)
- *save_addr = msg.msg_name;
+ *save_addr = msg->msg_name;
- if (msg.msg_name && kmsg->msg_namelen) {
+ if (msg->msg_name && kmsg->msg_namelen) {
if (!save_addr) {
- err = move_addr_to_kernel(msg.msg_name,
+ err = move_addr_to_kernel(msg->msg_name,
kmsg->msg_namelen,
kmsg->msg_name);
if (err < 0)
@@ -2401,12 +2396,10 @@ int __copy_msghdr_from_user(struct msghdr *kmsg,
kmsg->msg_namelen = 0;
}
- if (msg.msg_iovlen > UIO_MAXIOV)
+ if (msg->msg_iovlen > UIO_MAXIOV)
return -EMSGSIZE;
kmsg->msg_iocb = NULL;
- *uiov = msg.msg_iov;
- *nsegs = msg.msg_iovlen;
return 0;
}
@@ -2418,8 +2411,10 @@ static int copy_msghdr_from_user(struct msghdr *kmsg,
struct user_msghdr msg;
ssize_t err;
- err = __copy_msghdr_from_user(kmsg, umsg, save_addr, &msg.msg_iov,
- &msg.msg_iovlen);
+ if (copy_from_user(&msg, umsg, sizeof(*umsg)))
+ return -EFAULT;
+
+ err = __copy_msghdr(kmsg, &msg, save_addr);
if (err)
return err;
--
2.30.2
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