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Diffstat (limited to 'net/socket.c')
-rw-r--r--net/socket.c140
1 files changed, 67 insertions, 73 deletions
diff --git a/net/socket.c b/net/socket.c
index fe20c319a0bb..ee3ee39eefa5 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -1988,13 +1988,26 @@ struct used_address {
unsigned int name_len;
};
-static int copy_msghdr_from_user(struct msghdr *kmsg,
- struct msghdr __user *umsg)
+static ssize_t copy_msghdr_from_user(struct msghdr *kmsg,
+ struct user_msghdr __user *umsg,
+ struct sockaddr __user **save_addr,
+ struct iovec **iov)
{
- if (copy_from_user(kmsg, umsg, sizeof(struct msghdr)))
+ struct sockaddr __user *uaddr;
+ struct iovec __user *uiov;
+ ssize_t err;
+
+ if (!access_ok(VERIFY_READ, umsg, sizeof(*umsg)) ||
+ __get_user(uaddr, &umsg->msg_name) ||
+ __get_user(kmsg->msg_namelen, &umsg->msg_namelen) ||
+ __get_user(uiov, &umsg->msg_iov) ||
+ __get_user(kmsg->msg_iovlen, &umsg->msg_iovlen) ||
+ __get_user(kmsg->msg_control, &umsg->msg_control) ||
+ __get_user(kmsg->msg_controllen, &umsg->msg_controllen) ||
+ __get_user(kmsg->msg_flags, &umsg->msg_flags))
return -EFAULT;
- if (kmsg->msg_name == NULL)
+ if (!uaddr)
kmsg->msg_namelen = 0;
if (kmsg->msg_namelen < 0)
@@ -2002,10 +2015,34 @@ static int copy_msghdr_from_user(struct msghdr *kmsg,
if (kmsg->msg_namelen > sizeof(struct sockaddr_storage))
kmsg->msg_namelen = sizeof(struct sockaddr_storage);
- return 0;
+
+ if (save_addr)
+ *save_addr = uaddr;
+
+ if (uaddr && kmsg->msg_namelen) {
+ if (!save_addr) {
+ err = move_addr_to_kernel(uaddr, kmsg->msg_namelen,
+ kmsg->msg_name);
+ if (err < 0)
+ return err;
+ }
+ } else {
+ kmsg->msg_name = NULL;
+ kmsg->msg_namelen = 0;
+ }
+
+ if (kmsg->msg_iovlen > UIO_MAXIOV)
+ return -EMSGSIZE;
+
+ err = rw_copy_check_uvector(save_addr ? READ : WRITE,
+ uiov, kmsg->msg_iovlen,
+ UIO_FASTIOV, *iov, iov);
+ if (err >= 0)
+ kmsg->msg_iov = *iov;
+ return err;
}
-static int ___sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
+static int ___sys_sendmsg(struct socket *sock, struct user_msghdr __user *msg,
struct msghdr *msg_sys, unsigned int flags,
struct used_address *used_address)
{
@@ -2017,34 +2054,15 @@ static int ___sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
__attribute__ ((aligned(sizeof(__kernel_size_t))));
/* 20 is size of ipv6_pktinfo */
unsigned char *ctl_buf = ctl;
- int err, ctl_len, total_len;
-
- err = -EFAULT;
- if (MSG_CMSG_COMPAT & flags) {
- if (get_compat_msghdr(msg_sys, msg_compat))
- return -EFAULT;
- } else {
- err = copy_msghdr_from_user(msg_sys, msg);
- if (err)
- return err;
- }
+ int ctl_len, total_len;
+ ssize_t err;
- if (msg_sys->msg_iovlen > UIO_FASTIOV) {
- err = -EMSGSIZE;
- if (msg_sys->msg_iovlen > UIO_MAXIOV)
- goto out;
- err = -ENOMEM;
- iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
- GFP_KERNEL);
- if (!iov)
- goto out;
- }
+ msg_sys->msg_name = &address;
- /* This will also move the address data into kernel space */
- if (MSG_CMSG_COMPAT & flags) {
- err = verify_compat_iovec(msg_sys, iov, &address, VERIFY_READ);
- } else
- err = verify_iovec(msg_sys, iov, &address, VERIFY_READ);
+ if (MSG_CMSG_COMPAT & flags)
+ err = get_compat_msghdr(msg_sys, msg_compat, NULL, &iov);
+ else
+ err = copy_msghdr_from_user(msg_sys, msg, NULL, &iov);
if (err < 0)
goto out_freeiov;
total_len = err;
@@ -2115,7 +2133,6 @@ out_freectl:
out_freeiov:
if (iov != iovstack)
kfree(iov);
-out:
return err;
}
@@ -2123,7 +2140,7 @@ out:
* BSD sendmsg interface
*/
-long __sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
+long __sys_sendmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
{
int fput_needed, err;
struct msghdr msg_sys;
@@ -2140,7 +2157,7 @@ out:
return err;
}
-SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned int, flags)
+SYSCALL_DEFINE3(sendmsg, int, fd, struct user_msghdr __user *, msg, unsigned int, flags)
{
if (flags & MSG_CMSG_COMPAT)
return -EINVAL;
@@ -2177,7 +2194,7 @@ int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
while (datagrams < vlen) {
if (MSG_CMSG_COMPAT & flags) {
- err = ___sys_sendmsg(sock, (struct msghdr __user *)compat_entry,
+ err = ___sys_sendmsg(sock, (struct user_msghdr __user *)compat_entry,
&msg_sys, flags, &used_address);
if (err < 0)
break;
@@ -2185,7 +2202,7 @@ int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
++compat_entry;
} else {
err = ___sys_sendmsg(sock,
- (struct msghdr __user *)entry,
+ (struct user_msghdr __user *)entry,
&msg_sys, flags, &used_address);
if (err < 0)
break;
@@ -2215,7 +2232,7 @@ SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
return __sys_sendmmsg(fd, mmsg, vlen, flags);
}
-static int ___sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
+static int ___sys_recvmsg(struct socket *sock, struct user_msghdr __user *msg,
struct msghdr *msg_sys, unsigned int flags, int nosec)
{
struct compat_msghdr __user *msg_compat =
@@ -2223,44 +2240,22 @@ static int ___sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
struct iovec iovstack[UIO_FASTIOV];
struct iovec *iov = iovstack;
unsigned long cmsg_ptr;
- int err, total_len, len;
+ int total_len, len;
+ ssize_t err;
/* kernel mode address */
struct sockaddr_storage addr;
/* user mode address pointers */
struct sockaddr __user *uaddr;
- int __user *uaddr_len;
+ int __user *uaddr_len = COMPAT_NAMELEN(msg);
- if (MSG_CMSG_COMPAT & flags) {
- if (get_compat_msghdr(msg_sys, msg_compat))
- return -EFAULT;
- } else {
- err = copy_msghdr_from_user(msg_sys, msg);
- if (err)
- return err;
- }
-
- if (msg_sys->msg_iovlen > UIO_FASTIOV) {
- err = -EMSGSIZE;
- if (msg_sys->msg_iovlen > UIO_MAXIOV)
- goto out;
- err = -ENOMEM;
- iov = kmalloc(msg_sys->msg_iovlen * sizeof(struct iovec),
- GFP_KERNEL);
- if (!iov)
- goto out;
- }
+ msg_sys->msg_name = &addr;
- /* Save the user-mode address (verify_iovec will change the
- * kernel msghdr to use the kernel address space)
- */
- uaddr = (__force void __user *)msg_sys->msg_name;
- uaddr_len = COMPAT_NAMELEN(msg);
if (MSG_CMSG_COMPAT & flags)
- err = verify_compat_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
+ err = get_compat_msghdr(msg_sys, msg_compat, &uaddr, &iov);
else
- err = verify_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
+ err = copy_msghdr_from_user(msg_sys, msg, &uaddr, &iov);
if (err < 0)
goto out_freeiov;
total_len = err;
@@ -2303,7 +2298,6 @@ static int ___sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
out_freeiov:
if (iov != iovstack)
kfree(iov);
-out:
return err;
}
@@ -2311,7 +2305,7 @@ out:
* BSD recvmsg interface
*/
-long __sys_recvmsg(int fd, struct msghdr __user *msg, unsigned flags)
+long __sys_recvmsg(int fd, struct user_msghdr __user *msg, unsigned flags)
{
int fput_needed, err;
struct msghdr msg_sys;
@@ -2328,7 +2322,7 @@ out:
return err;
}
-SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
+SYSCALL_DEFINE3(recvmsg, int, fd, struct user_msghdr __user *, msg,
unsigned int, flags)
{
if (flags & MSG_CMSG_COMPAT)
@@ -2373,7 +2367,7 @@ int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
* No need to ask LSM for more than the first datagram.
*/
if (MSG_CMSG_COMPAT & flags) {
- err = ___sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
+ err = ___sys_recvmsg(sock, (struct user_msghdr __user *)compat_entry,
&msg_sys, flags & ~MSG_WAITFORONE,
datagrams);
if (err < 0)
@@ -2382,7 +2376,7 @@ int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
++compat_entry;
} else {
err = ___sys_recvmsg(sock,
- (struct msghdr __user *)entry,
+ (struct user_msghdr __user *)entry,
&msg_sys, flags & ~MSG_WAITFORONE,
datagrams);
if (err < 0)
@@ -2571,13 +2565,13 @@ SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
(int __user *)a[4]);
break;
case SYS_SENDMSG:
- err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
+ err = sys_sendmsg(a0, (struct user_msghdr __user *)a1, a[2]);
break;
case SYS_SENDMMSG:
err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
break;
case SYS_RECVMSG:
- err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
+ err = sys_recvmsg(a0, (struct user_msghdr __user *)a1, a[2]);
break;
case SYS_RECVMMSG:
err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-07-11 12:25:08 +0200