[PATCH 3.12 54/56] x86/efi: Enforce CONFIG_RELOCATABLE for EFI boot stub

From: Jiri Slaby
Date: Wed Sep 03 2014 - 05:58:42 EST

From: Matt Fleming <matt.fleming@xxxxxxxxx>

3.12-stable review patch. If anyone has any objections, please let me know.


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 PrÃmont <bonbons@xxxxxxxxxxxxxxxxx>
Tested-by: Bruno PrÃmont <bonbons@xxxxxxxxxxxxxxxxx>
Cc: H. Peter Anvin <hpa@xxxxxxxxx>
Signed-off-by: Matt Fleming <matt.fleming@xxxxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
arch/x86/Kconfig | 1 +
1 file changed, 1 insertion(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 9b6f78f57d86..f968d8527190 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -1608,6 +1608,7 @@ config EFI
config EFI_STUB
bool "EFI stub support"
depends on EFI
This kernel feature allows a bzImage to be loaded directly
by EFI firmware without the use of a bootloader.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/