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net: copy from user before calling __get_compat_msghdr

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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.

Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Dylan Yudaken <dylany@fb.com>
Link: https://lore.kernel.org/r/20220714110258.1336200-3-dylany@fb.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Dylan Yudaken 2022-07-14 04:02:57 -07:00 • committed by Jens Axboe
parent 7fa875b8e5
commit 72c531f8ef
3 changed files with 28 additions and 33 deletions
Download patch file Download diff file Expand all files Collapse all files

39
net/compat.c
View file

@ -34,20 +34,15 @@
#include <net/compat.h>
int __get_compat_msghdr(struct msghdr *kmsg,
struct compat_msghdr __user *umsg,
struct sockaddr __user **save_addr,
compat_uptr_t *ptr, compat_size_t *len)
struct compat_msghdr *msg,
struct sockaddr __user **save_addr)
{
struct compat_msghdr msg;
ssize_t err;
if (copy_from_user(&msg, umsg, sizeof(*umsg)))
return -EFAULT;
kmsg->msg_flags = msg->msg_flags;
kmsg->msg_namelen = msg->msg_namelen;
kmsg->msg_flags = msg.msg_flags;
kmsg->msg_namelen = msg.msg_namelen;
if (!msg.msg_name)
if (!msg->msg_name)
kmsg->msg_namelen = 0;
if (kmsg->msg_namelen < 0)
@ -57,15 +52,15 @@ int __get_compat_msghdr(struct msghdr *kmsg,
kmsg->msg_namelen = sizeof(struct sockaddr_storage);
kmsg->msg_control_is_user = true;
kmsg->msg_control_user = compat_ptr(msg.msg_control);
kmsg->msg_controllen = msg.msg_controllen;
kmsg->msg_control_user = compat_ptr(msg->msg_control);
kmsg->msg_controllen = msg->msg_controllen;
if (save_addr)
*save_addr = compat_ptr(msg.msg_name);
*save_addr = compat_ptr(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(compat_ptr(msg.msg_name),
err = move_addr_to_kernel(compat_ptr(msg->msg_name),
kmsg->msg_namelen,
kmsg->msg_name);
if (err < 0)
@ -76,12 +71,10 @@ int __get_compat_msghdr(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;
*ptr = msg.msg_iov;
*len = msg.msg_iovlen;
return 0;
}
@ -90,15 +83,17 @@ int get_compat_msghdr(struct msghdr *kmsg,
struct sockaddr __user **save_addr,
struct iovec **iov)
{
compat_uptr_t ptr;
compat_size_t len;
struct compat_msghdr msg;
ssize_t err;
err = __get_compat_msghdr(kmsg, umsg, save_addr, &ptr, &len);
if (copy_from_user(&msg, umsg, sizeof(*umsg)))
return -EFAULT;
err = __get_compat_msghdr(kmsg, umsg, save_addr);
if (err)
return err;
err = import_iovec(save_addr ? READ : WRITE, compat_ptr(ptr), len,
err = import_iovec(save_addr ? READ : WRITE, compat_ptr(msg.msg_iov), msg.msg_iovlen,
UIO_FASTIOV, iov, &kmsg->msg_iter);
return err < 0 ? err : 0;
}