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authorDavid Woodhouse <dwmw2@infradead.org>2006-06-23 03:07:52 +0400
committerDavid S. Miller <davem@sunset.davemloft.net>2006-06-23 13:07:44 +0400
commitca6bb5d7ab22ac79f608fe6cbc6b12de6a5a19f0 (patch)
tree7255df98fa5692c498605d2bd80402ec866f134a /drivers/net/tun.c
parentf4b8ea7849544114e9d3d682df4d400180854677 (diff)
downloadlinux-ca6bb5d7ab22ac79f608fe6cbc6b12de6a5a19f0.tar.xz
[NET]: Require CAP_NET_ADMIN to create tuntap devices.
The tuntap driver allows an admin to create persistent devices and assign ownership of them to individual users. Unfortunately, relaxing the permissions on the /dev/net/tun device node so that they can actually use those devices will _also_ allow those users to create arbitrary new devices of their own. This patch corrects that, and adjusts the recommended permissions for the device node accordingly. Signed-off-By: David Woodhouse <dwmw2@infradead.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/tun.c')
-rw-r--r--drivers/net/tun.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index a1ed2d983740..6c62d5c88268 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -490,6 +490,9 @@ static int tun_set_iff(struct file *file, struct ifreq *ifr)
err = -EINVAL;
+ if (!capable(CAP_NET_ADMIN))
+ return -EPERM;
+
/* Set dev type */
if (ifr->ifr_flags & IFF_TUN) {
/* TUN device */