From: Matthew Garrett <mjg@redhat.com>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: kexec@lists.infradead.org, horms@verge.net.au,
"Eric W. Biederman" <ebiederm@xmission.com>,
"H. Peter Anvin" <hpa@zytor.com>, Dave Young <dyoung@redhat.com>,
Khalid Aziz <khalid@gonehiking.org>
Subject: Re: [RFC] Kdump with UEFI secure boot (Re: [PATCH v2] kdump: pass acpi_rsdp= to 2nd kernel for efi booting)
Date: Tue, 23 Oct 2012 16:41:24 +0100 [thread overview]
Message-ID: <20121023154123.GA30730@srcf.ucam.org> (raw)
In-Reply-To: <20121023145920.GD16496@redhat.com>
On Tue, Oct 23, 2012 at 10:59:20AM -0400, Vivek Goyal wrote:
> But what about creation of a new program which can call kexec_load()
> and execute an unsigned kernel. Doesn't look like that will be
> prevented using IMA.
Right. Trusting userspace would require a new system call that passes in
a signature of the userspace binary, and the kernel would then have to
verify the ELF object in memory in order to ensure that it
matches the signature. Verifying that the copy on the filesystem is
unmodified isn't adequate - an attacker could simply have paused the
process and injected code. Realistically, the only solution here is for
the kernel to verify that the kernel it's about to boot is signed and
for it not to take any untrusted executable code from userspace.
--
Matthew Garrett | mjg59@srcf.ucam.org
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next prev parent reply other threads:[~2012-10-23 15:41 UTC|newest]
Thread overview: 84+ 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 [this message]
2012-10-23 16:44 ` [RFC] Kdump with signed images Eric W. Biederman
2012-10-23 16:52 ` Matthew Garrett
2012-10-24 17:19 ` Vivek Goyal
2012-10-25 5:43 ` Mimi Zohar
2012-10-25 6:44 ` Kees Cook
2012-10-25 7:01 ` Mimi Zohar
2012-10-25 13:54 ` Vivek Goyal
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
2012-10-23 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
2012-10-25 6:10 ` Mimi Zohar
2012-10-25 14:10 ` Vivek Goyal
2012-10-25 18:40 ` Mimi Zohar
2012-10-25 18:55 ` Vivek Goyal
2012-10-26 1:15 ` Mimi Zohar
2012-10-26 2:39 ` Matthew Garrett
2012-10-26 3:30 ` Eric W. Biederman
2012-10-26 17:06 ` Vivek Goyal
2012-10-26 18:37 ` Mimi Zohar
2012-11-01 13:10 ` Vivek Goyal
2012-11-01 13:53 ` Vivek Goyal
2012-11-01 14:29 ` Mimi Zohar
2012-11-01 14:43 ` Vivek Goyal
2012-11-01 14:52 ` Matthew Garrett
2012-11-02 13:23 ` Vivek Goyal
2012-11-02 14:29 ` Balbir Singh
2012-11-02 14:36 ` Vivek Goyal
2012-11-03 3:02 ` Balbir Singh
2012-11-02 21:34 ` H. Peter Anvin
2012-11-02 21:32 ` Eric W. Biederman
2012-11-05 18:03 ` Vivek Goyal
2012-11-05 19:44 ` Eric W. Biederman
2012-11-05 20:42 ` Vivek Goyal
2012-11-05 23:01 ` H. Peter Anvin
2012-11-06 19:34 ` Vivek Goyal
2012-11-06 23:51 ` Eric W. Biederman
2012-11-08 19:40 ` Vivek Goyal
2012-11-08 19:45 ` Vivek Goyal
2012-11-08 21:03 ` Eric W. Biederman
2012-11-09 14:39 ` Vivek Goyal
2012-11-15 5:09 ` Eric W. Biederman
2012-11-15 12:56 ` Mimi Zohar
2012-11-08 20:46 ` Mimi Zohar
2012-11-01 14:51 ` Vivek Goyal
2012-11-01 14:57 ` Matthew Garrett
2012-11-01 15:10 ` Khalid Aziz
2012-11-01 16:23 ` Matthew Garrett
2012-11-02 16:57 ` Khalid Aziz
2012-10-26 17:59 ` Mimi Zohar
2012-10-26 18:19 ` Matthew Garrett
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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