From: David Woodhouse <dwmw@xxxxxxxxxxxx> All writes to the page now happen before it gets marked as executable (or after it's already switched to the identmap page tables where it's OK to be RWX). Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx> --- arch/x86/kernel/machine_kexec_64.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/machine_kexec_64.c b/arch/x86/kernel/machine_kexec_64.c index c653c2c22d63..2a294daeeb1a 100644 --- a/arch/x86/kernel/machine_kexec_64.c +++ b/arch/x86/kernel/machine_kexec_64.c @@ -319,7 +319,7 @@ int machine_kexec_prepare(struct kimage *image) __memcpy(control_page, __relocate_kernel_start, reloc_end - reloc_start); - set_memory_x((unsigned long)control_page, 1); + set_memory_rox((unsigned long)control_page, 1); return 0; } @@ -329,6 +329,7 @@ void machine_kexec_cleanup(struct kimage *image) void *control_page = page_address(image->control_code_page) + PAGE_SIZE; set_memory_nx((unsigned long)control_page, 1); + set_memory_rw((unsigned long)control_page, 1); free_transition_pgtable(image); } -- 2.47.0
