From: Matthew Garrett <mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
To: Thomas Renninger <trenn-l3A5Bk7waGM@public.gmane.org>
Cc: "H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>,
linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
matt.fleming-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org,
jlee-IBi9RG/b67k@public.gmane.org
Subject: Re: Do not allow MSR or Embedded Controller writes from userspace in secure boot case
Date: Thu, 8 Nov 2012 14:41:25 +0000 [thread overview]
Message-ID: <20121108144125.GC24094@srcf.ucam.org> (raw)
In-Reply-To: <201211081538.34091.trenn-l3A5Bk7waGM@public.gmane.org>
On Thu, Nov 08, 2012 at 03:38:33PM +0100, Thomas Renninger wrote:
> BTW: Who decides what is allowed and what is not?
Tree maintainers.
> I guess it should be the spec. I haven't read the details, but
> when even Matthew is not sure, it sounds as if this is phrased
> rather imprecise. And as Windows is afaik the central key authority
> they can enforce their interpretation of the spec for Linux as well?
The spec is purely mechanism, not policy. Policy is up to the OS
vendors.
> I like to have this boot parameter to also work the
> other way around:
> secureboot_enable=no
> and let all secure boot things fall off, only set a
> TAINT_INSECURE_BOOT_EVEN_BIOS_REQUESTED_SECURE_BOOT
>
> Can SUSE sign this kernel without fearing to get the key revoked
> from Windows?
If anyone used that kernel to attack Windows, the signature would get
revoked.
> Can this exist in the mainline kernel?
Sure, but vendors might want to patch it out, depending on how paranoid
they are.
--
Matthew Garrett | mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org
next prev parent reply other threads:[~2012-11-08 14:41 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-07 21:28 Do not allow MSR or Embedded Controller writes from userspace in secure boot case Thomas Renninger
[not found] ` <1352323699-52400-1-git-send-email-trenn-l3A5Bk7waGM@public.gmane.org>
2012-11-07 21:28 ` [PATCH 1/2] ACPI ec_sys: Do not allow write access to EC in secure boot mode Thomas Renninger
2012-11-07 21:28 ` [PATCH 2/2] X86 msr: Do not allow MSR writes " Thomas Renninger
2012-11-07 21:54 ` Do not allow MSR or Embedded Controller writes from userspace in secure boot case Matthew Garrett
[not found] ` <20121107215403.GA7277-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
2012-11-07 22:50 ` H. Peter Anvin
2012-11-07 22:51 ` H. Peter Anvin
[not found] ` <509AE5DA.1030508-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2012-11-07 23:21 ` Alan Cox
2012-11-08 14:38 ` Thomas Renninger
[not found] ` <201211081538.34091.trenn-l3A5Bk7waGM@public.gmane.org>
2012-11-08 14:41 ` Matthew Garrett [this message]
[not found] ` <20121108144125.GC24094-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
2012-11-08 14:44 ` Shea Levy
[not found] ` <509BC53B.5070304-yfkUTty7RcRWk0Htik3J/w@public.gmane.org>
2012-11-08 14:47 ` Matthew Garrett
2012-11-09 12:35 ` H. Peter Anvin
2012-11-08 9:40 ` Thomas Renninger
[not found] ` <201211081040.33981.trenn-l3A5Bk7waGM@public.gmane.org>
2012-11-08 14:39 ` Matthew Garrett
[not found] ` <20121108143919.GB24094-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org>
2012-11-08 16:43 ` Alan Cox
2012-11-07 23:27 ` Alan Cox
[not found] ` <20121107232722.67589868-38n7/U1jhRXW96NNrWNlrekiAK3p4hvP@public.gmane.org>
2012-11-08 14:19 ` [RFC] [PATCH] X86 MSR read whitelist Thomas Renninger
[not found] ` <201211081519.23364.trenn-l3A5Bk7waGM@public.gmane.org>
2012-11-08 15:36 ` Alan Cox
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