net: Only NET_ADMIN is allowed to fully control TUN interfaces.

Signed-off-by: Chia-chi Yeh <chiachi@android.com>

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 5235f48be1be677b7ca57fd275c21392fb846762..67e474ff1a91c2c55b3167f37545c1aef38dffdc 100644 (file)
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1238,6 +1238,12 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
        int vnet_hdr_sz;
        int ret;
 
+#ifdef CONFIG_ANDROID_PARANOID_NETWORK
+       if (cmd != TUNGETIFF && !capable(CAP_NET_ADMIN)) {
+               return -EPERM;
+       }
+#endif
+
        if (cmd == TUNSETIFF || _IOC_TYPE(cmd) == 0x89)
                if (copy_from_user(&ifr, argp, ifreq_len))
                        return -EFAULT;