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

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... 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>
This commit is contained in:
Borislav Petkov 2016-07-27 14:09:39 +02:00 committed by Ingo Molnar
parent df15929f8f
commit 4a1a8e1b8f
2 changed files with 2 additions and 3 deletions
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3
arch/x86/include/asm/page_32_types.h
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@ -13,7 +13,8 @@
* If you want more physical memory than this then see the CONFIG_HIGHMEM4G
* and CONFIG_HIGHMEM64G options in the kernel configuration.
*/
#define __PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL)
#define __PAGE_OFFSET_BASE _AC(CONFIG_PAGE_OFFSET, UL)
#define __PAGE_OFFSET __PAGE_OFFSET_BASE
#define __START_KERNEL_map __PAGE_OFFSET

2
arch/x86/kernel/cpu/microcode/intel.c
View File

@ -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);