| Message ID | 20190520231948.49693-5-thgarnie@chromium.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | x86: PIE support to extend KASLR randomization | expand |
On Mon, May 20, 2019 at 04:19:29PM -0700, Thomas Garnier wrote: > From: Thomas Garnier <thgarnie@google.com> > > 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@google.com> Reviewed-by: Kees Cook <keescook@chromium.org> -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 >
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