Getting full path from dentry in LSM hooks
From: Kristian Sørensen
Date: Fri Sep 03 2004 - 07:21:35 EST
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 Sørensen.
The Umbrella Project -- http://umbrella.sf.net
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