Message-ID: <41385FA5.806@cs.aau.dk>
Date: Fri, 03 Sep 2004 14:12:21 +0200
From: =?ISO-8859-1?Q?Kristian_S=F8rensen?= <ks@cs.aau.dk>
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To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
CC: umbrella-devel@lists.sourceforge.net
Subject: Getting full path from dentry in LSM hooks
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Hi!

I have a short question, concerning how to get the full path of a file 
from a LSM hook.

- If the "file" of the dentry is located in the root filesystem: no
   problem - simply traverse the dentrys, to generate the path.

- If the "file" is mounted from another partition, you do not get the
   full path by traversing the dentrys.

Example:
If we have a system with a normal root (/) and a seperate boot partition 
(mounted on /boot :). In the LSM hook inode_permission, you get the 
arguments (struct inode *inode, int mask, struct nameidata *nd).
Finding the path, we traverse the dentrys from (nd->dentry). But if the 
inode is a file in /boot we only get the filename (e.g. kernel-2.6.8.1 
instead of /boot/kernel-2.6.8.1)


Can some one reveal the trick to get the full path nomater if the 
filesystem is root or mounted elsewhere in the filesystem?


Best regards,
Kristian S?rensen.
The Umbrella Project -- http://umbrella.sf.net
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