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net: get rid of some pointless casts to sockaddr 

The following 4 functions:
  move_addr_to_kernel
  move_addr_to_user
  verify_iovec
  verify_compat_iovec
are always effectively called with a sockaddr_storage.

Make this explicit by changing their signature.

This removes a large number of casts from sockaddr_storage to sockaddr.

Signed-off-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Maciej Żenczykowski 2012-03-11 12:51:50 +00:00 committed by David S. Miller
parent 8b2aaedee4
commit 43db362d3a
5 changed files with 19 additions and 27 deletions
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4
include/linux/socket.h
View File

@ -326,11 +326,11 @@ extern int csum_partial_copy_fromiovecend(unsigned char *kdata,
int offset,
unsigned int len, __wsum *csump);
extern int verify_iovec(struct msghdr *m, struct iovec *iov, struct sockaddr *address, int mode);
extern int verify_iovec(struct msghdr *m, struct iovec *iov, struct sockaddr_storage *address, int mode);
extern int memcpy_toiovec(struct iovec *v, unsigned char *kdata, int len);
extern int memcpy_toiovecend(const struct iovec *v, unsigned char *kdata,
int offset, int len);
extern int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr *kaddr);
extern int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr);
extern int put_cmsg(struct msghdr*, int level, int type, int len, void *data);
struct timespec;

2
include/net/compat.h
View File

@ -41,7 +41,7 @@ extern int compat_sock_get_timestampns(struct sock *, struct timespec __user *);
#endif /* defined(CONFIG_COMPAT) */
extern int get_compat_msghdr(struct msghdr *, struct compat_msghdr __user *);
extern int verify_compat_iovec(struct msghdr *, struct iovec *, struct sockaddr *, int);
extern int verify_compat_iovec(struct msghdr *, struct iovec *, struct sockaddr_storage *, int);
extern asmlinkage long compat_sys_sendmsg(int,struct compat_msghdr __user *,unsigned);
extern asmlinkage long compat_sys_sendmmsg(int, struct compat_mmsghdr __user *,
unsigned, unsigned);

2
net/compat.c
View File

@ -79,7 +79,7 @@ int get_compat_msghdr(struct msghdr *kmsg, struct compat_msghdr __user *umsg)
/* I've named the args so it is easy to tell whose space the pointers are in. */
int verify_compat_iovec(struct msghdr *kern_msg, struct iovec *kern_iov,
struct sockaddr *kern_address, int mode)
struct sockaddr_storage *kern_address, int mode)
{
int tot_len;

2
net/core/iovec.c
View File

@ -35,7 +35,7 @@
* in any case.
*/
int verify_iovec(struct msghdr *m, struct iovec *iov, struct sockaddr *address, int mode)
int verify_iovec(struct msghdr *m, struct iovec *iov, struct sockaddr_storage *address, int mode)
{
int size, ct, err;

36
net/socket.c
View File

@ -181,7 +181,7 @@ static DEFINE_PER_CPU(int, sockets_in_use);
* invalid addresses -EFAULT is returned. On a success 0 is returned.
*/
int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr *kaddr)
int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr_storage *kaddr)
{
if (ulen < 0 || ulen > sizeof(struct sockaddr_storage))
return -EINVAL;
@ -209,7 +209,7 @@ int move_addr_to_kernel(void __user *uaddr, int ulen, struct sockaddr *kaddr)
* specified. Zero is returned for a success.
*/
static int move_addr_to_user(struct sockaddr *kaddr, int klen,
static int move_addr_to_user(struct sockaddr_storage *kaddr, int klen,
void __user *uaddr, int __user *ulen)
{
int err;
@ -1449,7 +1449,7 @@ SYSCALL_DEFINE3(bind, int, fd, struct sockaddr __user *, umyaddr, int, addrlen)
sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (sock) {
err = move_addr_to_kernel(umyaddr, addrlen, (struct sockaddr *)&address);
err = move_addr_to_kernel(umyaddr, addrlen, &address);
if (err >= 0) {
err = security_socket_bind(sock,
(struct sockaddr *)&address,
@ -1556,7 +1556,7 @@ SYSCALL_DEFINE4(accept4, int, fd, struct sockaddr __user *, upeer_sockaddr,
err = -ECONNABORTED;
goto out_fd;
}
err = move_addr_to_user((struct sockaddr *)&address,
err = move_addr_to_user(&address,
len, upeer_sockaddr, upeer_addrlen);
if (err < 0)
goto out_fd;
@ -1605,7 +1605,7 @@ SYSCALL_DEFINE3(connect, int, fd, struct sockaddr __user *, uservaddr,
sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (!sock)
goto out;
err = move_addr_to_kernel(uservaddr, addrlen, (struct sockaddr *)&address);
err = move_addr_to_kernel(uservaddr, addrlen, &address);
if (err < 0)
goto out_put;
@ -1645,7 +1645,7 @@ SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
err = sock->ops->getname(sock, (struct sockaddr *)&address, &len, 0);
if (err)
goto out_put;
err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr, usockaddr_len);
err = move_addr_to_user(&address, len, usockaddr, usockaddr_len);
out_put:
fput_light(sock->file, fput_needed);
@ -1677,7 +1677,7 @@ SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
sock->ops->getname(sock, (struct sockaddr *)&address, &len,
1);
if (!err)
err = move_addr_to_user((struct sockaddr *)&address, len, usockaddr,
err = move_addr_to_user(&address, len, usockaddr,
usockaddr_len);
fput_light(sock->file, fput_needed);
}
@ -1716,7 +1716,7 @@ SYSCALL_DEFINE6(sendto, int, fd, void __user *, buff, size_t, len,
msg.msg_controllen = 0;
msg.msg_namelen = 0;
if (addr) {
err = move_addr_to_kernel(addr, addr_len, (struct sockaddr *)&address);
err = move_addr_to_kernel(addr, addr_len, &address);
if (err < 0)
goto out_put;
msg.msg_name = (struct sockaddr *)&address;
@ -1779,7 +1779,7 @@ SYSCALL_DEFINE6(recvfrom, int, fd, void __user *, ubuf, size_t, size,
err = sock_recvmsg(sock, &msg, size, flags);
if (err >= 0 && addr != NULL) {
err2 = move_addr_to_user((struct sockaddr *)&address,
err2 = move_addr_to_user(&address,
msg.msg_namelen, addr, addr_len);
if (err2 < 0)
err = err2;
@ -1933,13 +1933,9 @@ static int __sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
/* This will also move the address data into kernel space */
if (MSG_CMSG_COMPAT & flags) {
err = verify_compat_iovec(msg_sys, iov,
(struct sockaddr *)&address,
VERIFY_READ);
err = verify_compat_iovec(msg_sys, iov, &address, VERIFY_READ);
} else
err = verify_iovec(msg_sys, iov,
(struct sockaddr *)&address,
VERIFY_READ);
err = verify_iovec(msg_sys, iov, &address, VERIFY_READ);
if (err < 0)
goto out_freeiov;
total_len = err;
@ -2143,13 +2139,9 @@ static int __sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
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,
(struct sockaddr *)&addr,
VERIFY_WRITE);
err = verify_compat_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
} else
err = verify_iovec(msg_sys, iov,
(struct sockaddr *)&addr,
VERIFY_WRITE);
err = verify_iovec(msg_sys, iov, &addr, VERIFY_WRITE);
if (err < 0)
goto out_freeiov;
total_len = err;
@ -2166,7 +2158,7 @@ static int __sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
len = err;
if (uaddr != NULL) {
err = move_addr_to_user((struct sockaddr *)&addr,
err = move_addr_to_user(&addr,
msg_sys->msg_namelen, uaddr,
uaddr_len);
if (err < 0)