On Mon, May 20, 2019 at 04:19:29PM -0700, Thomas Garnier wrote: > From: Thomas Garnier <thgarnie@xxxxxxxxxx> > > 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 0xffffffff80000000. > > Signed-off-by: Thomas Garnier <thgarnie@xxxxxxxxxx> Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx> -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 > call swap_pages > - movq $virtual_mapped, %rax > + movabsq $virtual_mapped, %rax > pushq %rax > ret > > -- > 2.21.0.1020.gf2820cf01a-goog > -- Kees Cook
