linux-kernel - Re: [Xen-devel] [PATCH v2 01/11] kexec: introduce kexec

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: <20121123111308.GB3002@host-192-168-1-59.local.net-space.pl>
Date:	Fri, 23 Nov 2012 12:13:08 +0100
From:	Daniel Kiper <daniel.kiper@...cle.com>
To:	Ian Campbell <Ian.Campbell@...rix.com>
Cc:	Jan Beulich <JBeulich@...e.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
	Andrew Cooper <Andrew.Cooper3@...rix.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"kexec@...ts.infradead.org" <kexec@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"virtualization@...ts.linux-foundation.org" 
	<virtualization@...ts.linux-foundation.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>
Subject: Re: [Xen-devel] [PATCH v2 01/11] kexec: introduce kexec_ops struct

On Fri, Nov 23, 2012 at 10:51:08AM +0000, Ian Campbell wrote:
> On Fri, 2012-11-23 at 10:37 +0000, Daniel Kiper wrote:
> > On Fri, Nov 23, 2012 at 09:53:37AM +0000, Jan Beulich wrote:
> > > >>> On 23.11.12 at 02:56, Andrew Cooper <andrew.cooper3@...rix.com> wrote:
> > > > The crash region (as specified by crashkernel= on the Xen command line)
> > > > is isolated from dom0.
> > > >[...]
> > >
> > > But all of this _could_ be done completely independent of the
> > > Dom0 kernel's kexec infrastructure (i.e. fully from user space,
> > > invoking the necessary hypercalls through the privcmd driver).
> >
> > No, this is impossible. kexec/kdump image lives in dom0 kernel memory
> > until execution.
>
> Are you sure? I could have sworn they lived in the hypervisor owned
> memory set aside by the crashkernel= parameter as Andy suggested.

I am sure. It is moved to final resting place when
relocate_kernel() is called by hypervisor.

Daniel
--
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/