From: "H. Peter Anvin" <hpa@zytor.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,
Borislav Petkov <bp@alien8.de>,
ebiederm@xmission.com, akpm@linux-foundation.org,
zohar@linux.vnet.ibm.com
Subject: Re: [PATCH 15/16] bootparam: Pass acpi_rsdp pointer in bootparam
Date: Tue, 10 Sep 2013 15:52:24 -0700 [thread overview]
Message-ID: <522FA2A8.8080703@zytor.com> (raw)
In-Reply-To: <1378849471-10521-16-git-send-email-vgoyal@redhat.com>
On 09/10/2013 02:44 PM, Vivek Goyal wrote:
> Currently kexec does not enables EFI and its tables in second kernel. Hence
> acpi rsdp root pointer is passed on command line. But secureboot does not trust
> acpi_rsdp on command line as kernel can execute some of the code as retrieved
> by following acpi_rsdp and root can modify command line. So in secureboot
> mode we ignore acpi_rsdp on command line.
>
> Start passing it in bootparams for the time being. kexec-tools will prepare
> the bootparams and put acpi_rsdp pointer there.
>
> Peter Jones suggested that scan all ACPI memory for acpi_rsdp if EFI is
> not enabled. This probably is a better fix and most likely this patch will
> change and adopt that approach down the line.
>
> In fact if we figure out how to make UEFI run time calls in second kernel,
> we will not need acpi_rsdp at all.
>
Borislav Petkov has been working on a fixed mapping of UEFI memory,
which should allow UEFI runtime calls across kexec.
-hpa
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WARNING: multiple messages have this Message-ID (diff)
From: "H. Peter Anvin" <hpa@zytor.com>
To: Vivek Goyal <vgoyal@redhat.com>
Cc: linux-kernel@vger.kernel.org,
linux-security-module@vger.kernel.org, kexec@lists.infradead.org,
akpm@linux-foundation.org, zohar@linux.vnet.ibm.com,
d.kasatkin@samsung.com, ebiederm@xmission.com,
matthew.garrett@nebula.com, Borislav Petkov <bp@alien8.de>
Subject: Re: [PATCH 15/16] bootparam: Pass acpi_rsdp pointer in bootparam
Date: Tue, 10 Sep 2013 15:52:24 -0700 [thread overview]
Message-ID: <522FA2A8.8080703@zytor.com> (raw)
In-Reply-To: <1378849471-10521-16-git-send-email-vgoyal@redhat.com>
On 09/10/2013 02:44 PM, Vivek Goyal wrote:
> Currently kexec does not enables EFI and its tables in second kernel. Hence
> acpi rsdp root pointer is passed on command line. But secureboot does not trust
> acpi_rsdp on command line as kernel can execute some of the code as retrieved
> by following acpi_rsdp and root can modify command line. So in secureboot
> mode we ignore acpi_rsdp on command line.
>
> Start passing it in bootparams for the time being. kexec-tools will prepare
> the bootparams and put acpi_rsdp pointer there.
>
> Peter Jones suggested that scan all ACPI memory for acpi_rsdp if EFI is
> not enabled. This probably is a better fix and most likely this patch will
> change and adopt that approach down the line.
>
> In fact if we figure out how to make UEFI run time calls in second kernel,
> we will not need acpi_rsdp at all.
>
Borislav Petkov has been working on a fixed mapping of UEFI memory,
which should allow UEFI runtime calls across kexec.
-hpa
next prev parent reply other threads:[~2013-09-10 22:53 UTC|newest]
Thread overview: 82+ 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 ` 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 ` 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 ` 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 ` Vivek Goyal
2013-09-10 21:44 ` [PATCH 04/16] integrity: Allow digital signature verification with a given keyring ptr Vivek Goyal
2013-09-10 21:44 ` Vivek Goyal
2013-09-11 17:34 ` Mimi Zohar
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 ` 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 ` 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 ` Vivek Goyal
2013-09-10 21:44 ` [PATCH 08/16] binfmt_elf: Elf executable signature verification Vivek Goyal
2013-09-10 21:44 ` 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 ` 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 ` 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 ` 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 ` 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 ` 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 21:44 ` Vivek Goyal
2013-09-10 22:40 ` Greg KH
2013-09-10 22:40 ` Greg KH
2013-09-11 13:44 ` Vivek Goyal
2013-09-11 13:44 ` Vivek Goyal
2013-09-10 22:57 ` Josh Boyer
2013-09-10 22:57 ` Josh Boyer
2013-09-11 13:51 ` Vivek Goyal
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 21:44 ` Vivek Goyal
2013-09-10 22:52 ` H. Peter Anvin [this message]
2013-09-10 22:52 ` H. Peter Anvin
2013-09-11 11:44 ` Borislav Petkov
2013-09-11 11:44 ` Borislav Petkov
2013-09-11 13:45 ` Vivek Goyal
2013-09-11 13:45 ` Vivek Goyal
2013-09-11 14:32 ` Borislav Petkov
2013-09-11 14:32 ` Borislav Petkov
2013-09-12 7:34 ` Dave Young
2013-09-12 7:34 ` Dave Young
2013-09-12 12:53 ` Borislav Petkov
2013-09-12 12:53 ` Borislav Petkov
2013-09-12 13:19 ` Vivek Goyal
2013-09-12 14:25 ` Borislav Petkov
2013-09-12 14:25 ` Borislav Petkov
2013-09-12 14:34 ` Matthew Garrett
2013-09-12 14:34 ` Matthew Garrett
2013-09-12 14:42 ` Borislav Petkov
2013-09-12 14:42 ` Borislav Petkov
2013-09-13 7:12 ` Dave Young
2013-09-13 7:12 ` Dave Young
2013-09-13 11:26 ` Borislav Petkov
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
2013-09-10 21:44 ` Vivek Goyal
2013-09-12 3:40 ` [PATCH 00/16] [RFC PATCH] Signed kexec support Greg KH
2013-09-12 3:40 ` Greg KH
2013-09-12 11:43 ` Vivek Goyal
2013-09-12 11:43 ` Vivek Goyal
2013-09-12 16:17 ` Greg KH
2013-09-12 16:17 ` Greg KH
2013-09-12 18:24 ` Mimi Zohar
2013-09-12 18:24 ` Mimi Zohar
2013-09-16 14:28 ` Vivek Goyal
2013-09-18 14:51 ` Andrea Adami
2013-09-18 14:51 ` Andrea Adami
2013-09-23 17:15 ` Vivek Goyal
2013-09-23 17:15 ` Vivek Goyal
2013-09-16 14:24 ` Vivek Goyal
2013-09-16 14:24 ` Vivek Goyal
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