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From: Matthew Garrett <matthew.garrett@nebula.com>
To: "gnomes@lxorguk.ukuu.org.uk" <gnomes@lxorguk.ukuu.org.uk>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"jmorris@namei.org" <jmorris@namei.org>,
	"keescook@chromium.org" <keescook@chromium.org>,
	"linux-security-module@vger.kernel.org" 
	<linux-security-module@vger.kernel.org>,
	"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
	"hpa@zytor.com" <hpa@zytor.com>,
	"jwboyer@fedoraproject.org" <jwboyer@fedoraproject.org>,
	"linux-efi@vger.kernel.org" <linux-efi@vger.kernel.org>,
	"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>
Subject: Re: Trusted kernel patchset for Secure Boot lockdown
Date: Thu, 13 Mar 2014 21:30:48 +0000	[thread overview]
Message-ID: <1394746248.27846.3.camel@x230> (raw)
In-Reply-To: <20140313212450.67f1de8e@alan.etchedpixels.co.uk>

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On Thu, 2014-03-13 at 21:24 +0000, One Thousand Gnomes wrote:

> If I have CAP_SYS_RAWIO I can make arbitary ring 0 calls from userspace,
> trivially and in a fashion well known and documented.

How?

> You've missed a few others too - mem= (especially with exactmap) for
> example.

/dev/mem access is restricted, so what would this buy you? The potential
to have the kernel hand over a region belonging to hardware in response
to a userspace allocation?

-- 
Matthew Garrett <matthew.garrett@nebula.com>
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  parent reply	other threads:[~2014-03-13 21:31 UTC|newest]

Thread overview: 72+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-02-26 20:11 Trusted kernel patchset for Secure Boot lockdown Matthew Garrett
2014-02-26 20:11 ` [PATCH 01/12] Add support for indicating that the booted kernel is externally trusted Matthew Garrett
2014-02-27 19:02   ` Kees Cook
2014-03-31 14:49   ` Pavel Machek
2014-02-26 20:11 ` [PATCH 02/12] Enforce module signatures when trusted kernel is enabled Matthew Garrett
2014-02-26 20:11 ` [PATCH 03/12] PCI: Lock down BAR access when trusted_kernel is true Matthew Garrett
2014-02-26 20:11 ` [PATCH 04/12] x86: Lock down IO port " Matthew Garrett
2014-02-26 20:11 ` [PATCH 05/12] Restrict /dev/mem and /dev/kmem " Matthew Garrett
2014-02-26 20:11 ` [PATCH 06/12] acpi: Limit access to custom_method if " Matthew Garrett
2014-02-26 20:11 ` [PATCH 07/12] acpi: Ignore acpi_rsdp kernel parameter when " Matthew Garrett
2014-02-26 20:11 ` [PATCH 08/12] kexec: Disable at runtime if " Matthew Garrett
2014-02-26 20:11 ` [PATCH 09/12] uswsusp: Disable when " Matthew Garrett
2014-03-31 14:49   ` Pavel Machek
2014-02-26 20:11 ` [PATCH 10/12] x86: Restrict MSR access " Matthew Garrett
2014-02-26 20:11 ` [PATCH 11/12] asus-wmi: Restrict debugfs interface " Matthew Garrett
2014-02-26 20:11 ` [PATCH 12/12] Add option to automatically set trusted_kernel when in Secure Boot mode Matthew Garrett
2014-02-26 22:41   ` One Thousand Gnomes
2014-02-26 22:47     ` H. Peter Anvin
2014-02-26 22:48     ` Matthew Garrett
2014-02-27 18:48       ` Kees Cook
2014-02-26 21:11 ` Trusted kernel patchset for Secure Boot lockdown Kees Cook
2014-02-26 22:21   ` One Thousand Gnomes
2014-03-19 17:42     ` Florian Weimer
2014-02-27 18:04 ` Josh Boyer
2014-02-27 19:07   ` Greg KH
2014-02-27 19:11     ` Josh Boyer
2014-02-28 12:50       ` Josh Boyer
2014-02-28  3:03   ` James Morris
2014-02-28  4:52     ` Matthew Garrett
2014-03-13  5:01     ` Matthew Garrett
2014-03-13  6:22       ` Kees Cook
2014-03-13  9:33         ` James Morris
2014-03-13 10:12           ` One Thousand Gnomes
2014-03-13 15:54             ` H. Peter Anvin
2014-03-13 15:59           ` Matthew Garrett
2014-03-13 21:24             ` One Thousand Gnomes
2014-03-13 21:28               ` H. Peter Anvin
2014-03-13 21:32                 ` Matthew Garrett
2014-03-13 21:30               ` Matthew Garrett [this message]
2014-03-13 23:21                 ` One Thousand Gnomes
2014-03-14  1:57                   ` Matthew Garrett
2014-03-14 12:22                     ` One Thousand Gnomes
2014-03-14 12:51                       ` Matthew Garrett
2014-03-14 15:23                         ` Kees Cook
2014-03-14 15:46                           ` Matthew Garrett
2014-03-14 15:54                             ` Kees Cook
2014-03-14 15:58                               ` Matthew Garrett
2014-03-14 16:28                           ` One Thousand Gnomes
2014-03-14 17:06                         ` One Thousand Gnomes
2014-03-14 18:11                           ` Matthew Garrett
2014-03-14 19:24                             ` Matthew Garrett
2014-03-14 20:37                               ` David Lang
2014-03-14 20:43                                 ` Matthew Garrett
2014-03-14 21:58                               ` One Thousand Gnomes
2014-03-14 22:04                                 ` Matthew Garrett
2014-03-14 21:48                             ` One Thousand Gnomes
2014-03-14 21:56                               ` Matthew Garrett
2014-03-14 22:08                                 ` One Thousand Gnomes
2014-03-14 22:15                                   ` Matthew Garrett
2014-03-14 22:31                                     ` One Thousand Gnomes
2014-03-14 22:52                                       ` Matthew Garrett
2014-03-19 19:50                                       ` Kees Cook
2014-03-14 23:18                                   ` Theodore Ts'o
2014-03-15  0:15                                     ` One Thousand Gnomes
2014-03-19 17:49                                     ` Florian Weimer
2014-03-19 20:16                                     ` Kees Cook
2014-03-20 14:47                                       ` One Thousand Gnomes
2014-03-20 14:55                                       ` tytso
2014-03-20 17:12                                         ` Matthew Garrett
2014-03-20 18:13                                           ` One Thousand Gnomes
2014-03-13 21:26             ` One Thousand Gnomes
2014-03-13 21:31               ` Matthew Garrett

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