From: Dave Young <dyoung-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
To: Matthew Garrett
<matthew.garrett-05XSO3Yj/JvQT0dZR+AlfA@public.gmane.org>
Cc: linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-security-module-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
kexec-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-pci-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Josh Boyer <jwboyer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH 10/12] acpi: Ignore acpi_rsdp kernel parameter in a secure boot environment
Date: Tue, 19 Mar 2013 16:47:27 +0800 [thread overview]
Message-ID: <5148261F.3030806@redhat.com> (raw)
In-Reply-To: <1363642353-30749-10-git-send-email-matthew.garrett-05XSO3Yj/JvQT0dZR+AlfA@public.gmane.org>
On 03/19/2013 05:32 AM, Matthew Garrett wrote:
> From: Josh Boyer <jwboyer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
>
> This option allows userspace to pass the RSDP address to the kernel. This
> could potentially be used to circumvent the secure boot trust model.
> We ignore the setting if we don't have the CAP_COMPROMISE_KERNEL capability.
>
> Signed-off-by: Josh Boyer <jwboyer-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
> ---
> drivers/acpi/osl.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
> index 586e7e9..0ef63f1 100644
> --- a/drivers/acpi/osl.c
> +++ b/drivers/acpi/osl.c
> @@ -245,7 +245,7 @@ early_param("acpi_rsdp", setup_acpi_rsdp);
> acpi_physical_address __init acpi_os_get_root_pointer(void)
> {
> #ifdef CONFIG_KEXEC
> - if (acpi_rsdp)
> + if (acpi_rsdp && capable(CAP_COMPROMISE_KERNEL))
> return acpi_rsdp;
> #endif
>
>
This does not work because capable is not usable at this early point.
Josh, could you update your fix here?
--
Thanks
Dave
next prev parent reply other threads:[~2013-03-19 8:47 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-18 21:32 [PATCH 01/12] Security: Add CAP_COMPROMISE_KERNEL Matthew Garrett
[not found] ` <1363642353-30749-1-git-send-email-matthew.garrett-05XSO3Yj/JvQT0dZR+AlfA@public.gmane.org>
2013-03-18 21:32 ` [PATCH 02/12] SELinux: define mapping for CAP_COMPROMISE_KERNEL Matthew Garrett
2013-03-18 21:32 ` [PATCH 04/12] efi: Enable secure boot lockdown automatically when enabled in firmware Matthew Garrett
2013-03-18 21:32 ` [PATCH 07/12] ACPI: Limit access to custom_method Matthew Garrett
2013-03-18 21:32 ` [PATCH 10/12] acpi: Ignore acpi_rsdp kernel parameter in a secure boot environment Matthew Garrett
[not found] ` <1363642353-30749-10-git-send-email-matthew.garrett-05XSO3Yj/JvQT0dZR+AlfA@public.gmane.org>
2013-03-19 8:47 ` Dave Young [this message]
[not found] ` <5148261F.3030806-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-03-19 11:19 ` Josh Boyer
2013-03-19 17:07 ` [PATCH v2] " Josh Boyer
2013-03-18 21:32 ` [PATCH 11/12] x86: Require CAP_COMPROMISE_KERNEL for MSR writing Matthew Garrett
2013-03-18 21:32 ` [PATCH 12/12] kexec: Require CAP_SYS_COMPROMISE_KERNEL Matthew Garrett
2013-03-19 4:47 ` [PATCH 01/12] Security: Add CAP_COMPROMISE_KERNEL James Morris
2013-03-20 1:03 ` H. Peter Anvin
2013-03-20 16:41 ` Mimi Zohar
2013-03-20 16:49 ` Matthew Garrett
2013-03-20 18:01 ` Mimi Zohar
2013-03-20 18:12 ` Matthew Garrett
[not found] ` <1363803158.2553.33.camel-tCUS0Eywp2Pehftex57rkxo58HMYffqeLoYNBG0abjxeoWH0uzbU5w@public.gmane.org>
2013-03-20 19:16 ` Mimi Zohar
[not found] ` <1363806968.2580.86.camel-T0Mscta5zSJpk64qw6wm7cxtgHpCUUYS@public.gmane.org>
2013-03-20 20:37 ` Matthew Garrett
2013-03-20 21:11 ` Mimi Zohar
2013-03-20 21:18 ` Matthew Garrett
[not found] ` <1363814289.2553.41.camel-tCUS0Eywp2Pehftex57rkxo58HMYffqeLoYNBG0abjxeoWH0uzbU5w@public.gmane.org>
2013-03-21 13:43 ` Vivek Goyal
[not found] ` <20130321134348.GA3934-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-03-21 15:37 ` Serge E. Hallyn
[not found] ` <20130321153725.GA3656-anj0Drq5vpzx6HRWoRZK3AC/G2K4zDHf@public.gmane.org>
2013-03-21 15:52 ` Vivek Goyal
[not found] ` <20130321155220.GL3934-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-03-21 15:58 ` Serge E. Hallyn
2013-03-21 16:04 ` Vivek Goyal
[not found] ` <20130321160441.GB6575-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2013-03-21 16:19 ` Serge E. Hallyn
[not found] ` <20130321161952.GA4957-anj0Drq5vpzx6HRWoRZK3AC/G2K4zDHf@public.gmane.org>
2013-03-21 17:15 ` Vivek Goyal
2013-03-21 1:58 ` James Morris
2013-03-18 21:32 ` [PATCH 03/12] Secure boot: Add a dummy kernel parameter that will switch on Secure Boot mode Matthew Garrett
2013-03-18 21:32 ` [PATCH 05/12] PCI: Require CAP_COMPROMISE_KERNEL for PCI BAR access Matthew Garrett
2013-03-27 15:03 ` Josh Boyer
2013-03-27 15:08 ` Kyle McMartin
2013-03-28 12:46 ` Josh Boyer
2013-03-18 21:32 ` [PATCH 06/12] x86: Require CAP_COMPROMISE_KERNEL for IO port access Matthew Garrett
2013-03-20 1:00 ` H. Peter Anvin
2013-03-18 21:32 ` [PATCH 08/12] asus-wmi: Restrict debugfs interface Matthew Garrett
2013-03-18 21:32 ` [PATCH 09/12] Require CAP_COMPROMISE_KERNEL for /dev/mem and /dev/kmem access Matthew Garrett
2013-03-19 7:18 ` [PATCH 01/12] Security: Add CAP_COMPROMISE_KERNEL Yves-Alexis Perez
2013-03-20 1:02 ` H. Peter Anvin
2013-03-20 1:05 ` H. Peter Anvin
[not found] ` <51490ABD.3050205-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2013-03-20 13:15 ` Matthew Garrett
[not found] ` <1363785354.2553.15.camel-tCUS0Eywp2Pehftex57rkxo58HMYffqeLoYNBG0abjxeoWH0uzbU5w@public.gmane.org>
2013-03-20 15:03 ` H. Peter Anvin
[not found] ` <db71c48c-4ec4-4611-935b-bb1b0441112d-2ueSQiBKiTY7tOexoI0I+QC/G2K4zDHf@public.gmane.org>
2013-03-20 15:14 ` Matthew Garrett
2013-03-20 16:45 ` H. Peter Anvin
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