Re: [tip:x86/boot] x86/mm: Enable KASLR for physical mapping memory regions

[Borislav Petkov]

On Tue, Aug 16, 2016 at 03:42:05PM +0200, Borislav Petkov wrote:
> I'll try to reproduce and fix this at some point but am away currently
> so don't hold your breath. Does "dis_ucode_ldr" on the kernel cmdline
> get you any further?

Just a stab in the dark: does something like that help?

---
diff --git a/arch/x86/kernel/cpu/microcode/amd.c 
b/arch/x86/kernel/cpu/microcode/amd.c
index 27a0228c9cae..2debaf119baf 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -434,6 +434,10 @@ int __init save_microcode_in_initrd_amd(void)
        else
                container = cont_va;
 
+#ifdef CONFIG_RANDOMIZE_MEMORY
+       container += PAGE_OFFSET - __PAGE_OFFSET_BASE;
+#endif
+
        eax   = cpuid_eax(0x00000001);
        eax   = ((eax >> 8) & 0xf) + ((eax >> 20) & 0xff);
 
---

Thanks.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
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