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

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Message-ID: <20091001091537.GA22337@c.hsd1.tn.comcast.net>
Date:	Thu, 1 Oct 2009 09:15:37 +0000
From:	Andy Spencer <andy753421@...il.com>
To:	Pavel Machek <pavel@....cz>
Cc:	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC] Privilege dropping security module

> 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.

> ...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.

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