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From: Greg KH <greg@kroah.com>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: matthew.garrett@nebula.com, d.kasatkin@samsung.com,
	kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
	linux-security-module@vger.kernel.org, ebiederm@xmission.com,
	hpa@zytor.com, akpm@linux-foundation.org,
	zohar@linux.vnet.ibm.com
Subject: Re: [PATCH 00/16] [RFC PATCH] Signed kexec support
Date: Wed, 11 Sep 2013 20:40:23 -0700	[thread overview]
Message-ID: <20130912034023.GA10877@kroah.com> (raw)
In-Reply-To: <1378849471-10521-1-git-send-email-vgoyal@redhat.com>

On Tue, Sep 10, 2013 at 05:44:15PM -0400, Vivek Goyal wrote:
> Hi,
> 
> Matthew has been posting patches to lock down kernel either due to
> secureboot requirements or because of signed modules with signing
> enforced. In kernel lock down mode, kexec will be disabled and that
> means kdump will not work either.
> 
> These patches sign /sbin/kexec and kernel verifies the signature
> and allows loading a kernel if signature verification is successful.
> IOW, trust is extended to validly signed user space.
> 
> Currently it works only for statically linked applications.

That's a really big restriction, pretty much making it not workable for
distros at the moment to use.

Any chance to change this in the future?  Or just rely on the existing
"signed binaries" functionality we have in the kernel today for the
kexec binary as well?  Wouldn't that be simpler?

thanks,

greg k-h

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  parent reply	other threads:[~2013-09-12  3:40 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-09-10 21:44 [PATCH 00/16] [RFC PATCH] Signed kexec support Vivek Goyal
2013-09-10 21:44 ` [PATCH 01/16] mm: vm_brk(), align the length to page boundary Vivek Goyal
2013-09-10 21:44 ` [PATCH 02/16] integrity: Add a function to determine digital signature length Vivek Goyal
2013-09-10 21:44 ` [PATCH 03/16] ima: Allow adding more memory locking metadata after digital signature v2 Vivek Goyal
2013-09-10 21:44 ` [PATCH 04/16] integrity: Allow digital signature verification with a given keyring ptr Vivek Goyal
2013-09-11 17:34   ` Mimi Zohar
2013-09-10 21:44 ` [PATCH 05/16] integrity: Export a function to retrieve hash algo used in digital signature Vivek Goyal
2013-09-10 21:44 ` [PATCH 06/16] ima: export new IMA functions for signature verification Vivek Goyal
2013-09-10 21:44 ` [PATCH 07/16] mm: Define a task flag MMF_VM_LOCKED for memlocked tasks and don't allow munlock Vivek Goyal
2013-09-10 21:44 ` [PATCH 08/16] binfmt_elf: Elf executable signature verification Vivek Goyal
2013-09-10 21:44 ` [PATCH 09/16] ima: define functions to appraise memory buffer contents Vivek Goyal
2013-09-10 21:44 ` [PATCH 10/16] keyctl: Introduce a new operation KEYCTL_VERIFY_SIGNATURE Vivek Goyal
2013-09-10 21:44 ` [PATCH 11/16] ptrace: Do not allow ptrace() from unsigned process to signed one Vivek Goyal
2013-09-10 21:44 ` [PATCH 12/16] binfmt_elf: Do not mark process signed if binary has elf interpreter Vivek Goyal
2013-09-10 21:44 ` [PATCH 13/16] kexec: Allow only signed processes to call sys_kexec() in secureboot mode Vivek Goyal
2013-09-10 21:44 ` [PATCH 14/16] kexec: Export sysfs attributes for secureboot and secure modules to user space Vivek Goyal
2013-09-10 22:40   ` Greg KH
2013-09-11 13:44     ` Vivek Goyal
2013-09-10 22:57   ` Josh Boyer
2013-09-11 13:51     ` Vivek Goyal
2013-09-10 21:44 ` [PATCH 15/16] bootparam: Pass acpi_rsdp pointer in bootparam Vivek Goyal
2013-09-10 22:52   ` H. Peter Anvin
2013-09-11 11:44     ` Borislav Petkov
2013-09-11 13:45       ` Vivek Goyal
2013-09-11 14:32         ` Borislav Petkov
2013-09-12  7:34           ` Dave Young
2013-09-12 12:53             ` Borislav Petkov
2013-09-12 13:19               ` Vivek Goyal
2013-09-12 14:25                 ` Borislav Petkov
2013-09-12 14:34               ` Matthew Garrett
2013-09-12 14:42                 ` Borislav Petkov
2013-09-13  7:12               ` Dave Young
2013-09-13 11:26                 ` Borislav Petkov
2013-09-10 21:44 ` [PATCH 16/16] mount: Add a flag to not follow symlink at the end of mount point Vivek Goyal
2013-09-12  3:40 ` Greg KH [this message]
2013-09-12 11:43   ` [PATCH 00/16] [RFC PATCH] Signed kexec support Vivek Goyal
2013-09-12 16:17     ` Greg KH
2013-09-12 18:24       ` Mimi Zohar
2013-09-16 14:28         ` Vivek Goyal
2013-09-18 14:51           ` Andrea Adami
2013-09-23 17:15             ` Vivek Goyal
2013-09-16 14:24       ` Vivek Goyal

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