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devinet_ioctl(): take copyin/copyout to caller

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Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2017-07-01 07:53:12 -04:00
parent 36fd633ec9
commit 03aef17bb7
4 changed files with 35 additions and 46 deletions
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21
net/ipv4/af_inet.c
View file

@ -872,6 +872,8 @@ int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
struct sock *sk = sock->sk;
int err = 0;
struct net *net = sock_net(sk);
void __user *p = (void __user *)arg;
struct ifreq ifr;
switch (cmd) {
case SIOCGSTAMP:
@ -891,17 +893,26 @@ int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
err = arp_ioctl(net, cmd, (void __user *)arg);
break;
case SIOCGIFADDR:
case SIOCSIFADDR:
case SIOCGIFBRDADDR:
case SIOCSIFBRDADDR:
case SIOCGIFNETMASK:
case SIOCSIFNETMASK:
case SIOCGIFDSTADDR:
case SIOCGIFPFLAGS:
if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
return -EFAULT;
err = devinet_ioctl(net, cmd, &ifr);
if (!err && copy_to_user(p, &ifr, sizeof(struct ifreq)))
err = -EFAULT;
break;
case SIOCSIFADDR:
case SIOCSIFBRDADDR:
case SIOCSIFNETMASK:
case SIOCSIFDSTADDR:
case SIOCSIFPFLAGS:
case SIOCGIFPFLAGS:
case SIOCSIFFLAGS:
err = devinet_ioctl(net, cmd, (void __user *)arg);
if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
return -EFAULT;
err = devinet_ioctl(net, cmd, &ifr);
break;
default:
if (sk->sk_prot->ioctl)