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Date: Wed, 7 Sep 2011 13:49:45 +0400
From: Vasiliy Kulikov <segoon@...nwall.com>
To: owl-dev@...ts.openwall.com
Subject: Re: /tmp fs type
Solar,
On Wed, Sep 07, 2011 at 13:36 +0400, Solar Designer wrote:
> On Wed, Sep 07, 2011 at 01:15:56PM +0400, Vasiliy Kulikov wrote:
> > While we have an option to setup /tmp as tmpfs,
>
> This is more than just an option - this is the current default. And if
> an admin overrides this default, then presumably they know what they're
> doing.
Maybe, but often fs type for /tmp is chosen not from security
considerations, but performance or robustness.
> > we probably should
> > support bind mounts for /tmp (and /home?) to deny creating links to sxid
> > binaries:
>
> /tmp is already a separate filesystem. As to /home, maybe. But we're
> planning to (re-)harden the kernel anyway, so why bother with partial
> workarounds in userspace? Just in case someone runs Owl userland with a
> non-Owl kernel?
How does the hardlink hardening protect against hardlinking into /home?
> And what do you mean by "supporting" bind mounts? Aren't they already
> supported (with a trivial edit to fstab)? Do you mean an installer
> feature? If so, I see no reason to provide it if it's just for those
> who would use a non-Owl kernel - that is, people who are willing to
> customize the system on their own.
I mean Owl 3.0 system installer with the default kernel. We don't plan
to backport kernel hardening stuff to 3.0, do we? As to /home, Owl 4.0
would benefit too.
Thanks,
--
Vasiliy
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