efi/x86: Remove __efistub_global and add relocation check

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Instead of using __efistub_global to force variables into the .data
section, leave them in the .bss but pull the EFI stub's .bss section
into .data in the linker script for the compressed kernel.

Add relocation checking for x86 as well to catch non-PC-relative
relocations that require runtime processing, since the EFI stub does not
do any runtime relocation processing.

This will catch, for example, data relocations created by static
initializers of pointers.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Link: https://lore.kernel.org/r/20200416151227.3360778-3-nivedita@alum.mit.edu
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>

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This commit is contained in:

Arvind Sankar 2020-04-16 11:12:26 -04:00 • committed by Ard Biesheuvel

parent 420b6d00ca

commit 26a92425f9

3 changed files with 22 additions and 15 deletions

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1

arch/x86/boot/compressed/vmlinux.lds.S

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32

drivers/firmware/efi/libstub/Makefile

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4

drivers/firmware/efi/libstub/efistub.h

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