linux-kernel - Re: [PATCH] System Wide Capability Bounding Set

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 27 Jan 2011 11:50:16 -0500
From:	Steve Grubb <sgrubb@...hat.com>
To:	"Andrew G. Morgan" <morgan@...nel.org>
Cc:	Eric Paris <eparis@...hat.com>, linux-kernel@...r.kernel.org,
	"Serge E. Hallyn" <serge@...onical.com>,
	"Serge E. Hallyn" <serge.hallyn@...onical.com>,
	linux-security-module@...r.kernel.org
Subject: Re: [PATCH] System Wide Capability Bounding Set

On Thursday, January 27, 2011 11:35:13 am Andrew G. Morgan wrote:
> > Today, people want to have multi-tenant hosting using virtual
> > machines whereby they give away root control of the guest VM.
> > If you were renting system space, you would expect root access.
> > That would make a nice juicy hacking target because you don't know
> > who else is sharing the physical machine with you and they might
> > have something in their VM worth stealing.
> 
> Which root filesystem (/) do kernel helpers run in in such a virtual setup?

I would assume that root in the VM could umount and mount anything. Or bind mount over 
it. We really want any change to a global bounding set done before initrd finishes 
doing its thing. This way there is no chance for mischief by the time control is 
turned over to /sbin/init - which root controls.

-Steve
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/