From: Vivek Goyal <vgoyal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
Cc: "xen-devel-GuqFBffKawuULHF6PoxzQEEOCMrvLtNR@public.gmane.org"
<xen-devel-GuqFBffKawuULHF6PoxzQEEOCMrvLtNR@public.gmane.org>,
Konrad Rzeszutek Wilk
<konrad.wilk-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>,
Andrew Cooper
<andrew.cooper3-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org>,
Daniel Kiper
<daniel.kiper-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>,
"x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org"
<x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
"kexec-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org"
<kexec-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org>,
"linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
"virtualization-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org"
<virtualization-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>,
David Howells <dhowells-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
"mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org"
<mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
"Eric W. Biederman"
<ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org>,
Jan Beulich <JBeulich-IBi9RG/b67k@public.gmane.org>,
"maxim.uvarov-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org"
<maxim.uvarov-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>,
"tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org"
<tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>
Subject: Re: [Xen-devel] [PATCH v3 00/11] xen: Initial kexec/kdump implementation
Date: Fri, 11 Jan 2013 16:08:01 -0500 [thread overview]
Message-ID: <20130111210801.GC12019@redhat.com> (raw)
In-Reply-To: <50F07E2D.6010602-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
On Fri, Jan 11, 2013 at 01:03:41PM -0800, H. Peter Anvin wrote:
> On 01/11/2013 12:52 PM, Vivek Goyal wrote:
> >
> > Eric,
> >
> > In a private conversation, David Howells suggested why not pass kernel
> > signature in a segment to kernel and kernel can do the verification.
> >
> > /sbin/kexec signature is verified by kernel at exec() time. Then
> > /sbin/kexec just passes one signature segment (after regular segment) for
> > each segment being loaded. The segments which don't have signature,
> > are passed with section size 0. And signature passing behavior can be
> > controlled by one new kexec flag.
> >
> > That way /sbin/kexec does not have to worry about doing any verification
> > by itself. In fact, I am not sure how it can do the verification when
> > crypto libraries it will need are not signed (assuming they are not
> > statically linked in).
> >
> > What do you think about this idea?
> >
>
> A signed /sbin/kexec would realistically have to be statically linked,
> at least in the short term; otherwise the libraries and ld.so would need
> verification as well.
Yes. That's the expectation. Sign only statically linked exeutables which
don't do any of dlopen() stuff either.
In fact in the patch, I fail the exec() if signed executable has
interpreter.
Thanks
Vivek
next prev parent reply other threads:[~2013-01-11 21:08 UTC|newest]
Thread overview: 63+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-27 2:18 [PATCH v3 00/11] xen: Initial kexec/kdump implementation Daniel Kiper
[not found] ` <1356574740-6806-1-git-send-email-daniel.kiper-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2012-12-27 2:18 ` [PATCH v3 01/11] kexec: introduce kexec firmware support Daniel Kiper
[not found] ` <1356574740-6806-2-git-send-email-daniel.kiper-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2012-12-27 2:18 ` [PATCH v3 02/11] x86/kexec: Add extra pointers to transition page table PGD, PUD, PMD and PTE Daniel Kiper
[not found] ` <1356574740-6806-3-git-send-email-daniel.kiper-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2012-12-27 2:18 ` [PATCH v3 03/11] xen: Introduce architecture independent data for kexec/kdump Daniel Kiper
[not found] ` <1356574740-6806-4-git-send-email-daniel.kiper-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2012-12-27 2:18 ` [PATCH v3 04/11] x86/xen: Introduce architecture dependent " Daniel Kiper
[not found] ` <1356574740-6806-5-git-send-email-daniel.kiper-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2012-12-27 2:18 ` [PATCH v3 05/11] x86/xen: Register resources required by kexec-tools Daniel Kiper
[not found] ` <1356574740-6806-6-git-send-email-daniel.kiper-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2012-12-27 2:18 ` [PATCH v3 06/11] x86/xen: Add i386 kexec/kdump implementation Daniel Kiper
[not found] ` <1356574740-6806-7-git-send-email-daniel.kiper-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2012-12-27 2:18 ` [PATCH v3 07/11] x86/xen: Add x86_64 " Daniel Kiper
[not found] ` <1356574740-6806-8-git-send-email-daniel.kiper-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2012-12-27 2:18 ` [PATCH v3 08/11] x86/xen: Add kexec/kdump Kconfig and makefile rules Daniel Kiper
[not found] ` <1356574740-6806-9-git-send-email-daniel.kiper-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2012-12-27 2:18 ` [PATCH v3 09/11] x86/xen/enlighten: Add init and crash kexec/kdump hooks Daniel Kiper
[not found] ` <1356574740-6806-10-git-send-email-daniel.kiper-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2012-12-27 2:18 ` [PATCH v3 10/11] drivers/xen: Export vmcoreinfo through sysfs Daniel Kiper
[not found] ` <1356574740-6806-11-git-send-email-daniel.kiper-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
2012-12-27 2:19 ` [PATCH v3 11/11] x86: Add Xen kexec control code size check to linker script Daniel Kiper
2012-12-27 18:53 ` [PATCH v3 09/11] x86/xen/enlighten: Add init and crash kexec/kdump hooks H. Peter Anvin
2012-12-27 4:00 ` [PATCH v3 06/11] x86/xen: Add i386 kexec/kdump implementation H. Peter Anvin
2012-12-27 3:33 ` [PATCH v3 02/11] x86/kexec: Add extra pointers to transition page table PGD, PUD, PMD and PTE H. Peter Anvin
2013-01-03 9:34 ` Jan Beulich
[not found] ` <50E55ECF02000078000B2A13@nat28.tlf.novell.com>
2013-01-04 15:15 ` Daniel Kiper
[not found] ` <20130104151542.GD3346@host-192-168-1-59.local.net-space.pl>
2013-01-04 16:12 ` Jan Beulich
[not found] ` <50E70D8002000078000B336D@nat28.tlf.novell.com>
2013-01-04 17:25 ` Daniel Kiper
[not found] ` <20130104172538.GC3472@host-192-168-1-59.local.net-space.pl>
2013-01-07 9:48 ` Jan Beulich
[not found] ` <50EAA7F402000078000B34C3@nat28.tlf.novell.com>
2013-01-07 12:52 ` Daniel Kiper
[not found] ` <20130107125211.GB2927@host-192-168-1-59.local.net-space.pl>
2013-01-07 13:05 ` Jan Beulich
[not found] ` <50EAD61602000078000B36A0@nat28.tlf.novell.com>
2013-01-09 18:42 ` Daniel Kiper
2013-01-10 14:07 ` David Vrabel
[not found] ` <50EECB23.4090603@citrix.com>
2013-01-11 13:36 ` Daniel Kiper
2012-12-27 4:46 ` [PATCH v3 01/11] kexec: introduce kexec firmware support Eric W. Biederman
2012-12-27 4:02 ` [PATCH v3 00/11] xen: Initial kexec/kdump implementation H. Peter Anvin
2012-12-27 7:53 ` Eric W. Biederman
2012-12-27 14:18 ` Andrew Cooper
2012-12-27 18:02 ` Eric W. Biederman
2013-01-02 11:26 ` [Xen-devel] " Andrew Cooper
2013-01-02 11:47 ` Eric W. Biederman
2013-01-03 9:31 ` Jan Beulich
2013-01-04 14:22 ` Daniel Kiper
2013-01-04 14:34 ` Konrad Rzeszutek Wilk
2013-01-04 14:34 ` Ian Campbell
2013-01-04 14:38 ` David Vrabel
2013-01-04 17:01 ` Daniel Kiper
2013-01-10 14:19 ` David Vrabel
2013-01-11 13:22 ` Daniel Kiper
2013-01-11 15:22 ` David Vrabel
2013-01-11 17:34 ` Daniel Kiper
2013-01-11 20:05 ` Eric W. Biederman
2013-01-04 14:41 ` Jan Beulich
[not found] ` <50E6F81D02000078000B3245-ce6RLXgGx+vWGUEhTRrCg1aTQe2KTcn/@public.gmane.org>
2013-01-04 17:07 ` Daniel Kiper
2013-01-04 19:11 ` Konrad Rzeszutek Wilk
[not found] ` <20130104191146.GC6721-6K5HmflnPlqSPmnEAIUT9EEOCMrvLtNR@public.gmane.org>
2013-01-07 10:25 ` Ian Campbell
2013-01-07 10:46 ` Andrew Cooper
2013-01-07 10:54 ` Ian Campbell
2013-01-07 12:34 ` Daniel Kiper
[not found] ` <20130107123404.GA2927-UojuW/CpjwpdUOLzJiIvSsFoITBeLw/klGfBN0aaEZ+lPcVs/6D9LQ@public.gmane.org>
2013-01-07 13:49 ` Ian Campbell
2013-01-11 13:47 ` Daniel Kiper
2013-01-07 16:20 ` Konrad Rzeszutek Wilk
2013-01-11 4:16 ` Eric W. Biederman
2013-01-11 16:55 ` Konrad Rzeszutek Wilk
2013-01-11 20:26 ` H. Peter Anvin
2013-01-11 20:43 ` Vivek Goyal
2013-01-11 20:26 ` Eric W. Biederman
2013-01-11 20:52 ` Vivek Goyal
[not found] ` <20130111205232.GC17126-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-01-11 21:03 ` H. Peter Anvin
[not found] ` <50F07E2D.6010602-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2013-01-11 21:08 ` Vivek Goyal [this message]
2013-01-11 21:14 ` H. Peter Anvin
[not found] ` <50DC58C4.3000307-Sxgqhf6Nn4DQT0dZR+AlfA@public.gmane.org>
2013-01-02 15:27 ` Ian Campbell
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