From: Matthew Garrett <mjg@redhat.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: kexec@lists.infradead.org, horms@verge.net.au,
"H. Peter Anvin" <hpa@zytor.com>, Dave Young <dyoung@redhat.com>,
Vivek Goyal <vgoyal@redhat.com>,
Khalid Aziz <khalid@gonehiking.org>
Subject: Re: [RFC] Kdump with signed images
Date: Tue, 23 Oct 2012 17:52:02 +0100 [thread overview]
Message-ID: <20121023165201.GA32748@srcf.ucam.org> (raw)
In-Reply-To: <87d309xhmc.fsf_-_@xmission.com>
On Tue, Oct 23, 2012 at 09:44:59AM -0700, Eric W. Biederman wrote:
> Hogwash. The kernel verifing a signature of /sbin/kexec at exec time is
> perfectly reasonable, and realistic. In fact finding a way to trust
> small bits of userspace even if root is compromised seems a far superior
> model to simply solving the signing problem for /sbin/kexec.
The kernel verifying the signature of /sbin/kexec and then knowing that
it should only grant permission to make this syscall to /sbin/kexec,
without that policy being provided by userspace.
--
Matthew Garrett | mjg59@srcf.ucam.org
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next prev parent reply other threads:[~2012-10-23 16:52 UTC|newest]
Thread overview: 133+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-18 3:10 [PATCH v2] kdump: pass acpi_rsdp= to 2nd kernel for efi booting Dave Young
2012-10-18 14:56 ` Khalid Aziz
2012-10-18 19:11 ` Vivek Goyal
2012-10-18 19:22 ` Khalid Aziz
2012-10-18 19:38 ` [RFC] Kdump with UEFI secure boot (Re: [PATCH v2] kdump: pass acpi_rsdp= to 2nd kernel for efi booting) Vivek Goyal
2012-10-18 19:55 ` Matthew Garrett
2012-10-18 22:25 ` Eric W. Biederman
2012-10-19 2:06 ` Vivek Goyal
2012-10-19 3:36 ` Eric W. Biederman
2012-10-19 14:31 ` Vivek Goyal
2012-10-22 20:43 ` Vivek Goyal
2012-10-22 21:11 ` Eric W. Biederman
2012-10-23 2:04 ` Simon Horman
2012-10-23 13:24 ` Vivek Goyal
2012-10-23 16:26 ` [RFC] Kdump with signed images Eric W. Biederman
2012-10-23 17:39 ` Vivek Goyal
2012-10-23 19:11 ` Maxim Uvarov
2012-10-23 19:16 ` Vivek Goyal
2012-10-22 21:07 ` [RFC] Kdump with UEFI secure boot (Re: [PATCH v2] kdump: pass acpi_rsdp= to 2nd kernel for efi booting) Eric W. Biederman
2012-10-23 13:18 ` Vivek Goyal
2012-10-23 14:59 ` Vivek Goyal
2012-10-23 15:41 ` Matthew Garrett
2012-10-23 16:44 ` [RFC] Kdump with signed images Eric W. Biederman
2012-10-23 16:52 ` Matthew Garrett [this message]
2012-10-24 17:19 ` Vivek Goyal
2012-10-24 17:19 ` Vivek Goyal
2012-10-25 5:43 ` Mimi Zohar
2012-10-25 5:43 ` Mimi Zohar
2012-10-25 6:44 ` Kees Cook
2012-10-25 6:44 ` Kees Cook
2012-10-25 7:01 ` Mimi Zohar
2012-10-25 7:01 ` Mimi Zohar
2012-10-25 13:54 ` Vivek Goyal
2012-10-25 13:54 ` Vivek Goyal
2012-10-25 19:06 ` Mimi Zohar
2012-10-25 19:06 ` Mimi Zohar
2012-10-25 15:39 ` [RFC] Kdump with UEFI secure boot (Re: [PATCH v2] kdump: pass acpi_rsdp= to 2nd kernel for efi booting) Vivek Goyal
2012-10-25 15:39 ` Vivek Goyal
2012-10-23 16:19 ` Kdump with signed images Eric W. Biederman
2012-10-23 16:31 ` Matthew Garrett
2012-10-23 17:03 ` Eric W. Biederman
2012-10-23 17:09 ` Matthew Garrett
2012-10-24 17:36 ` Vivek Goyal
2012-10-24 17:36 ` Vivek Goyal
2012-10-25 6:10 ` Mimi Zohar
2012-10-25 6:10 ` Mimi Zohar
2012-10-25 14:10 ` Vivek Goyal
2012-10-25 14:10 ` Vivek Goyal
2012-10-25 18:40 ` Mimi Zohar
2012-10-25 18:40 ` Mimi Zohar
2012-10-25 18:55 ` Vivek Goyal
2012-10-25 18:55 ` Vivek Goyal
2012-10-26 1:15 ` Mimi Zohar
2012-10-26 1:15 ` Mimi Zohar
2012-10-26 2:39 ` Matthew Garrett
2012-10-26 2:39 ` Matthew Garrett
2012-10-26 3:30 ` Eric W. Biederman
2012-10-26 3:30 ` Eric W. Biederman
2012-10-26 17:06 ` Vivek Goyal
2012-10-26 17:06 ` Vivek Goyal
2012-10-26 18:37 ` Mimi Zohar
2012-10-26 18:37 ` Mimi Zohar
2012-11-01 13:10 ` Vivek Goyal
2012-11-01 13:10 ` Vivek Goyal
2012-11-01 13:53 ` Vivek Goyal
2012-11-01 13:53 ` Vivek Goyal
2012-11-01 14:29 ` Mimi Zohar
2012-11-01 14:29 ` Mimi Zohar
2012-11-01 14:43 ` Vivek Goyal
2012-11-01 14:43 ` Vivek Goyal
2012-11-01 14:52 ` Matthew Garrett
2012-11-01 14:52 ` Matthew Garrett
2012-11-02 13:23 ` Vivek Goyal
2012-11-02 13:23 ` Vivek Goyal
2012-11-02 14:29 ` Balbir Singh
2012-11-02 14:29 ` Balbir Singh
2012-11-02 14:36 ` Vivek Goyal
2012-11-02 14:36 ` Vivek Goyal
2012-11-03 3:02 ` Balbir Singh
2012-11-03 3:02 ` Balbir Singh
2012-11-02 21:34 ` H. Peter Anvin
2012-11-02 21:34 ` H. Peter Anvin
2012-11-02 21:32 ` Eric W. Biederman
2012-11-02 21:32 ` Eric W. Biederman
2012-11-05 18:03 ` Vivek Goyal
2012-11-05 18:03 ` Vivek Goyal
2012-11-05 19:44 ` Eric W. Biederman
2012-11-05 19:44 ` Eric W. Biederman
2012-11-05 20:42 ` Vivek Goyal
2012-11-05 20:42 ` Vivek Goyal
2012-11-05 23:01 ` H. Peter Anvin
2012-11-05 23:01 ` H. Peter Anvin
2012-11-06 19:34 ` Vivek Goyal
2012-11-06 19:34 ` Vivek Goyal
2012-11-06 23:51 ` Eric W. Biederman
2012-11-06 23:51 ` Eric W. Biederman
2012-11-08 19:40 ` Vivek Goyal
2012-11-08 19:40 ` Vivek Goyal
2012-11-08 19:45 ` Vivek Goyal
2012-11-08 19:45 ` Vivek Goyal
2012-11-08 21:03 ` Eric W. Biederman
2012-11-08 21:03 ` Eric W. Biederman
2012-11-09 14:39 ` Vivek Goyal
2012-11-09 14:39 ` Vivek Goyal
2012-11-15 5:09 ` Eric W. Biederman
2012-11-15 5:09 ` Eric W. Biederman
2012-11-15 12:56 ` Mimi Zohar
2012-11-15 12:56 ` Mimi Zohar
2012-11-08 20:46 ` Mimi Zohar
2012-11-08 20:46 ` Mimi Zohar
2012-11-01 14:51 ` Vivek Goyal
2012-11-01 14:51 ` Vivek Goyal
2012-11-01 14:57 ` Matthew Garrett
2012-11-01 14:57 ` Matthew Garrett
2012-11-01 15:10 ` Khalid Aziz
2012-11-01 15:10 ` Khalid Aziz
2012-11-01 16:23 ` Matthew Garrett
2012-11-01 16:23 ` Matthew Garrett
2012-11-02 16:57 ` Khalid Aziz
2012-11-02 16:57 ` Khalid Aziz
2012-10-26 17:59 ` Mimi Zohar
2012-10-26 17:59 ` Mimi Zohar
2012-10-26 18:19 ` Matthew Garrett
2012-10-26 18:19 ` Matthew Garrett
2012-10-26 18:25 ` Mimi Zohar
2012-10-26 18:25 ` Mimi Zohar
2012-10-23 15:51 ` [RFC] Kdump with UEFI secure boot (Re: [PATCH v2] kdump: pass acpi_rsdp= to 2nd kernel for efi booting) Eric W. Biederman
2012-10-23 17:18 ` Vivek Goyal
2012-10-19 17:53 ` Vivek Goyal
2012-10-22 21:15 ` Eric W. Biederman
2012-11-02 21:36 ` H. Peter Anvin
2012-11-05 18:11 ` Vivek Goyal
2012-11-05 19:54 ` Eric W. Biederman
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