Re: [Qemu-devel] [PULL 04/05] seccomp: add setuid, setgid, chroot and setgroups to whitelist

[Eduardo Otubo]

On Mon, Nov 02, 2015 at 08=51=26AM +0100, Paolo Bonzini wrote:
> 
> 
> On 30/10/2015 14:44, Eduardo Otubo wrote:
> > From: Namsun Ch'o <address@hidden>
> > 
> > The seccomp sandbox doesn't whitelist setuid, setgid, or setgroups, which 
> > are
> > needed for -runas to work. It also doesn't whitelist chroot, which is needed
> > for the -chroot option. Unfortunately, QEMU enables seccomp before it drops
> > privileges or chroots, so without these whitelisted, -runas and -chroot 
> > cause
> > QEMU to be killed with -sandbox on. This patch adds those syscalls.
> 
> I think this patch should not be applied, because it completely defeats
> the purpose of the sandbox.  With these syscalls whitelisted, -runas and
> -chroot have absolutely no effect against an attacker, even with
> -sandbox on.
> 

Also, Namsun's emails are bouncing back. Don't know if it's worth to
merge them with no valid author's contact.

-- 
Eduardo Otubo
ProfitBricks GmbH

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