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path: root/drivers/net/tun.c
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Diffstat (limited to 'drivers/net/tun.c')
-rw-r--r--drivers/net/tun.c46
1 files changed, 32 insertions, 14 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 3a16d4fdaa0..498dc0d4ba5 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -120,8 +120,8 @@ struct tun_sock;
struct tun_struct {
struct tun_file *tfile;
unsigned int flags;
- uid_t owner;
- gid_t group;
+ kuid_t owner;
+ kgid_t group;
struct net_device *dev;
netdev_features_t set_features;
@@ -1031,8 +1031,8 @@ static void tun_setup(struct net_device *dev)
{
struct tun_struct *tun = netdev_priv(dev);
- tun->owner = -1;
- tun->group = -1;
+ tun->owner = INVALID_UID;
+ tun->group = INVALID_GID;
dev->ethtool_ops = &tun_ethtool_ops;
dev->destructor = tun_free_netdev;
@@ -1155,14 +1155,20 @@ static ssize_t tun_show_owner(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct tun_struct *tun = netdev_priv(to_net_dev(dev));
- return sprintf(buf, "%d\n", tun->owner);
+ return uid_valid(tun->owner)?
+ sprintf(buf, "%u\n",
+ from_kuid_munged(current_user_ns(), tun->owner)):
+ sprintf(buf, "-1\n");
}
static ssize_t tun_show_group(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct tun_struct *tun = netdev_priv(to_net_dev(dev));
- return sprintf(buf, "%d\n", tun->group);
+ return gid_valid(tun->group) ?
+ sprintf(buf, "%u\n",
+ from_kgid_munged(current_user_ns(), tun->group)):
+ sprintf(buf, "-1\n");
}
static DEVICE_ATTR(tun_flags, 0444, tun_show_flags, NULL);
@@ -1189,8 +1195,8 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
else
return -EINVAL;
- if (((tun->owner != -1 && cred->euid != tun->owner) ||
- (tun->group != -1 && !in_egroup_p(tun->group))) &&
+ if (((uid_valid(tun->owner) && !uid_eq(cred->euid, tun->owner)) ||
+ (gid_valid(tun->group) && !in_egroup_p(tun->group))) &&
!capable(CAP_NET_ADMIN))
return -EPERM;
err = security_tun_dev_attach(tun->socket.sk);
@@ -1374,6 +1380,8 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
void __user* argp = (void __user*)arg;
struct sock_fprog fprog;
struct ifreq ifr;
+ kuid_t owner;
+ kgid_t group;
int sndbuf;
int vnet_hdr_sz;
int ret;
@@ -1447,16 +1455,26 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
case TUNSETOWNER:
/* Set owner of the device */
- tun->owner = (uid_t) arg;
-
- tun_debug(KERN_INFO, tun, "owner set to %d\n", tun->owner);
+ owner = make_kuid(current_user_ns(), arg);
+ if (!uid_valid(owner)) {
+ ret = -EINVAL;
+ break;
+ }
+ tun->owner = owner;
+ tun_debug(KERN_INFO, tun, "owner set to %d\n",
+ from_kuid(&init_user_ns, tun->owner));
break;
case TUNSETGROUP:
/* Set group of the device */
- tun->group= (gid_t) arg;
-
- tun_debug(KERN_INFO, tun, "group set to %d\n", tun->group);
+ group = make_kgid(current_user_ns(), arg);
+ if (!gid_valid(group)) {
+ ret = -EINVAL;
+ break;
+ }
+ tun->group = group;
+ tun_debug(KERN_INFO, tun, "group set to %d\n",
+ from_kgid(&init_user_ns, tun->group));
break;
case TUNSETLINK: