x86/asm, x86/microcode: Add __PAGE_OFFSET_BASE define on 32-bit

... in order to avoid #ifdeffery in code computing the ASLR randomization
offset. Remove that #ifdeffery in the microcode loader.

Suggested-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Nicolai Stange <nicstange@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Garnier <thgarnie@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20160727120939.GA18911@nazgul.tnic
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 0 insertions, 2 deletions

diff --git a/arch/x86/kernel/cpu/microcode/intel.c b/arch/x86/kernel/cpu/microcode/intel.c
index 0f97ae93441b..cdc0deab00c9 100644
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -818,13 +818,11 @@ void load_ucode_intel_ap(void)
         if (blobs_p->valid) {
                 start = blobs_p->start;
 
-#ifdef CONFIG_RANDOMIZE_MEMORY
                 /*
                  * Pay attention to CONFIG_RANDOMIZE_MEMORY=y as it shuffles
                  * physmem mapping too and there we have the initrd.
                  */
                 start += PAGE_OFFSET - __PAGE_OFFSET_BASE;
-#endif
         }
 
         collect_cpu_info_early(&uci);