linux-kernel - tun device supplementary group ownership

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Date:	Wed, 21 Nov 2007 16:32:38 -0800
From:	"Mike Mohr" <akihana@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: tun device supplementary group ownership

Hi,

It seems to me that supplementary groups should be taken into account
when checking for permissions on a tun device.  Can someone comment on
my patch below; is it a reasonable approach?  If so, I'd like to
submit it for inclusion in the kernel under the GPL.

Please forward any responses to me directly in addition to the lkml.

Mike

--- tun.c       2007-11-16 10:14:27.000000000 -0800
+++ tun.c.new   2007-11-21 16:12:15.000000000 -0800
@@ -471,7 +471,8 @@
               if (((tun->owner != -1 &&
                     current->euid != tun->owner) ||
                    (tun->group != -1 &&
-                     current->egid != tun->group)) &&
+                     (current->egid != tun->group &&
+                      !groups_search(current->group_info, tun->group)))) &&
                    !capable(CAP_NET_ADMIN))
                       return -EPERM;
       }
-
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