linux-kernel - Re: [RFC] Privilege dropping security module

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Message-ID: <20091001104208.GC2159@elf.ucw.cz>
Date:	Thu, 1 Oct 2009 12:42:08 +0200
From:	Pavel Machek <pavel@....cz>
To:	Andy Spencer <andy753421@...il.com>
Cc:	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] Privilege dropping security module

On Thu 2009-10-01 09:15:37, Andy Spencer wrote:
> > Yeah, and now your ~/.ssh/identity is being uploaded to remote server.
> 
> The given policy sets the home directory (including ~/.ssh/) to `X'
> which does not include read access, so ~/.ssh/identity should be safe.
> There are some other problems with this particular policy though, /tmp/
> is still readable for example.
> 
> 
> > I believe people are already sandboxing apps with selinux...
> 
> Yes, some people (including myself) are already using selinux, tomoyo,
> smack, etc, for sandboxing. However, I think those have some
> disadvantages that I'm trying to address.

Ok, I guess advantages over selinux (etc) are probably worth it for
changelog on submission...

> > ...and subterfugue certainly does what you want, using ptrace... no
> > kernel mods needed and should already be secure.
> 
> subterfugue does look interesting, but it seems like it would be pretty
> slow and hasn't been unmaintained since 2001.

It is userland code, it should not have rotted that much.
									Pavel


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