Ensure WP bit to be set to prevent boot code from writing to non-writable memory pages. Signed-off-by: Evgeniy Baskov <baskov@xxxxxxxxx> --- arch/x86/boot/compressed/head_64.S | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/x86/boot/compressed/head_64.S b/arch/x86/boot/compressed/head_64.S index d33f060900d2..5273367283b7 100644 --- a/arch/x86/boot/compressed/head_64.S +++ b/arch/x86/boot/compressed/head_64.S @@ -619,9 +619,8 @@ SYM_CODE_START(trampoline_32bit_src) /* Set up new stack */ leal TRAMPOLINE_32BIT_STACK_END(%ecx), %esp - /* Disable paging */ - movl %cr0, %eax - btrl $X86_CR0_PG_BIT, %eax + /* Disable paging and setup CR0 */ + movl $(CR0_STATE & ~X86_CR0_PG), %eax movl %eax, %cr0 /* Check what paging mode we want to be in after the trampoline */ -- 2.35.1
