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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

  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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