On Mon, May 20, 2019 at 04:19:29PM -0700, Thomas Garnier wrote:
> From: Thomas Garnier
>
> Change the assembly code to use only absolute references of symbols for the
> kernel to be PIE compatible.
>
> Position Independent Executable (PIE) support will allow to extend the
> KASLR randomization range below 0x8000.
>
> Signed-off-by: Thomas Garnier
Reviewed-by: Kees Cook
-Kees
> ---
> arch/x86/kernel/relocate_kernel_64.S | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/x86/kernel/relocate_kernel_64.S
> b/arch/x86/kernel/relocate_kernel_64.S
> index 11eda21eb697..3320368b6ec9 100644
> --- a/arch/x86/kernel/relocate_kernel_64.S
> +++ b/arch/x86/kernel/relocate_kernel_64.S
> @@ -208,7 +208,7 @@ identity_mapped:
> movq%rax, %cr3
> lea PAGE_SIZE(%r8), %rsp
> callswap_pages
> - movq$virtual_mapped, %rax
> + movabsq $virtual_mapped, %rax
> pushq %rax
> ret
>
> --
> 2.21.0.1020.gf2820cf01a-goog
>
--
Kees Cook
