This is a note to let you know that I've just added the patch titled
x86/efi: Enforce CONFIG_RELOCATABLE for EFI boot stub
to the 3.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-efi-enforce-config_relocatable-for-efi-boot-stub.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 7b2a583afb4ab894f78bc0f8bd136e96b6499a7e Mon Sep 17 00:00:00 2001
From: Matt Fleming <matt.fleming@xxxxxxxxx>
Date: Fri, 11 Jul 2014 08:45:25 +0100
Subject: x86/efi: Enforce CONFIG_RELOCATABLE for EFI boot stub
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From: Matt Fleming <matt.fleming@xxxxxxxxx>
commit 7b2a583afb4ab894f78bc0f8bd136e96b6499a7e upstream.
Without CONFIG_RELOCATABLE the early boot code will decompress the
kernel to LOAD_PHYSICAL_ADDR. While this may have been fine in the BIOS
days, that isn't going to fly with UEFI since parts of the firmware
code/data may be located at LOAD_PHYSICAL_ADDR.
Straying outside of the bounds of the regions we've explicitly requested
from the firmware will cause all sorts of trouble. Bruno reports that
his machine resets while trying to decompress the kernel image.
We already go to great pains to ensure the kernel is loaded into a
suitably aligned buffer, it's just that the address isn't necessarily
LOAD_PHYSICAL_ADDR, because we can't guarantee that address isn't in-use
by the firmware.
Explicitly enforce CONFIG_RELOCATABLE for the EFI boot stub, so that we
can load the kernel at any address with the correct alignment.
Reported-by: Bruno Prémont <bonbons@xxxxxxxxxxxxxxxxx>
Tested-by: Bruno Prémont <bonbons@xxxxxxxxxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Signed-off-by: Matt Fleming <matt.fleming@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/Kconfig | 1 +
1 file changed, 1 insertion(+)
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1537,6 +1537,7 @@ config EFI
config EFI_STUB
bool "EFI stub support"
depends on EFI
+ select RELOCATABLE
---help---
This kernel feature allows a bzImage to be loaded directly
by EFI firmware without the use of a bootloader.
Patches currently in stable-queue which might be from matt.fleming@xxxxxxxxx are
queue-3.16/efi-arm64-store-runtime-services-revision.patch
queue-3.16/x86-efi-enforce-config_relocatable-for-efi-boot-stub.patch
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