linux-kernel - Re: [PATCH 0/2 v3] kvm: notify host when guest panicked

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

Message-ID: <20120314105936.GX2304@redhat.com>
Date:	Wed, 14 Mar 2012 12:59:36 +0200
From:	Gleb Natapov <gleb@...hat.com>
To:	Wen Congyang <wency@...fujitsu.com>
Cc:	Avi Kivity <avi@...hat.com>, Amit Shah <amit.shah@...hat.com>,
	"Daniel P. Berrange" <berrange@...hat.com>,
	kvm list <kvm@...r.kernel.org>,
	qemu-devel <qemu-devel@...gnu.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Jan Kiszka <jan.kiszka@...mens.com>
Subject: Re: [PATCH 0/2 v3] kvm: notify host when guest panicked

On Wed, Mar 14, 2012 at 06:58:47PM +0800, Wen Congyang wrote:
> At 03/14/2012 06:52 PM, Avi Kivity Wrote:
> > On 03/14/2012 12:52 PM, Wen Congyang wrote:
> >>>
> >>>> If so, is this channel visible to guest userspace? If the channle is visible to guest
> >>>> userspace, the program running in userspace may write the same message to the channel.
> >>>
> >>> Access control is via permissions.  You can have udev scripts assign
> >>> whatever uid and gid to the port of your interest.  By default, all
> >>> ports are only accessible to the root user.
> >>
> >> We should also prevent root user writing message to this channel if it is
> >> used for panicked notification.
> >>
> > 
> > Why?  root can easily cause a panic.
> > 
> 
> root user can write the same message to virtio-serial while the guest is running...
> 
So what?

--
			Gleb.
--
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/