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[Dazuko-devel] system call hooking for Linux 2.6?

From: John Ogness
Subject: [Dazuko-devel] system call hooking for Linux 2.6?
Date: Tue, 30 Aug 2005 10:40:28 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.8) Gecko/20050718 Debian/1.7.8-1sarge1


The number of complaints about using Dazuko with LSM for Linux 2.6 are
continually increasing. This is mainly a problem because many Linux
distributions compile Capabilities into the kernel (and Capabilities does
not support stacking).

Technically there is not a problem with hooking the system call table under
Linux 2.6. But this is frowned upon by the Linux kernel community, which is
why Dazuko uses LSM for Linux 2.6 instead.

The best solution would be to use DazukoFS, but this will not be available
for another year. So here are a set of questions that I would like some
feedback on:

Should Dazuko switch back to hooking the system call table for Linux 2.6
until DazukoFS is ready?

Should it be an option which method of hooking is used?

Should LSM be a fallback in case system call hooking doesn't work (or vice

Our final decision will not have any affect on the 2.1.0 release. I am not
willing to delay the 2.1.0 release in order to add system call hooking.

John Ogness

Dazuko Maintainer

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