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net: remove address space warnings in net/socket.c

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Casts __kernel to __user pointer require __force markup, so add it. Also
sock_get/setsockopt() takes @optval and/or @optlen arguments as user pointers
but were taking kernel pointers, use new variables 'uoptval' and/or 'uoptlen'
to fix it. These remove following warnings from sparse:

 net/socket.c:1922:46: warning: cast adds address space to expression (<asn:1>)
 net/socket.c:3061:61: warning: incorrect type in argument 4 (different address spaces)
 net/socket.c:3061:61:    expected char [noderef] <asn:1>*optval
 net/socket.c:3061:61:    got char *optval
 net/socket.c:3061:69: warning: incorrect type in argument 5 (different address spaces)
 net/socket.c:3061:69:    expected int [noderef] <asn:1>*optlen
 net/socket.c:3061:69:    got int *optlen
 net/socket.c:3063:67: warning: incorrect type in argument 4 (different address spaces)
 net/socket.c:3063:67:    expected char [noderef] <asn:1>*optval
 net/socket.c:3063:67:    got char *optval
 net/socket.c:3064:45: warning: incorrect type in argument 5 (different address spaces)
 net/socket.c:3064:45:    expected int [noderef] <asn:1>*optlen
 net/socket.c:3064:45:    got int *optlen
 net/socket.c:3078:61: warning: incorrect type in argument 4 (different address spaces)
 net/socket.c:3078:61:    expected char [noderef] <asn:1>*optval
 net/socket.c:3078:61:    got char *optval
 net/socket.c:3080:67: warning: incorrect type in argument 4 (different address spaces)
 net/socket.c:3080:67:    expected char [noderef] <asn:1>*optval
 net/socket.c:3080:67:    got char *optval

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Namhyung Kim 2010-09-07 03:55:00 +00:00 committed by David S. Miller
parent e3634169bc
commit fb8621bb6c
1 changed files with 15 additions and 6 deletions
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21
net/socket.c
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@ -1918,7 +1918,8 @@ SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned, flags)
* Afterwards, it will be a kernel pointer. Thus the compiler-assisted
* checking falls down on this.
*/
if (copy_from_user(ctl_buf, (void __user *)msg_sys.msg_control,
if (copy_from_user(ctl_buf,
(void __user __force *)msg_sys.msg_control,
ctl_len))
goto out_freectl;
msg_sys.msg_control = ctl_buf;
@ -3053,14 +3054,19 @@ int kernel_getsockopt(struct socket *sock, int level, int optname,
char *optval, int *optlen)
{
mm_segment_t oldfs = get_fs();
char __user *uoptval;
int __user *uoptlen;
int err;
uoptval = (char __user __force *) optval;
uoptlen = (int __user __force *) optlen;
set_fs(KERNEL_DS);
if (level == SOL_SOCKET)
err = sock_getsockopt(sock, level, optname, optval, optlen);
err = sock_getsockopt(sock, level, optname, uoptval, uoptlen);
else
err = sock->ops->getsockopt(sock, level, optname, optval,
optlen);
err = sock->ops->getsockopt(sock, level, optname, uoptval,
uoptlen);
set_fs(oldfs);
return err;
}
@ -3070,13 +3076,16 @@ int kernel_setsockopt(struct socket *sock, int level, int optname,
char *optval, unsigned int optlen)
{
mm_segment_t oldfs = get_fs();
char __user *uoptval;
int err;
uoptval = (char __user __force *) optval;
set_fs(KERNEL_DS);
if (level == SOL_SOCKET)
err = sock_setsockopt(sock, level, optname, optval, optlen);
err = sock_setsockopt(sock, level, optname, uoptval, optlen);
else
err = sock->ops->setsockopt(sock, level, optname, optval,
err = sock->ops->setsockopt(sock, level, optname, uoptval,
optlen);
set_fs(oldfs);
return err;