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Date: Tue, 16 Aug 2016 15:49:28 +0200 From: Borislav Petkov <bp@...en8.de> To: Brian Gerst <brgerst@...il.com> Cc: Baoquan He <bhe@...hat.com>, Yinghai Lu <yinghai@...nel.org>, Juergen Gross <jgross@...e.com>, Thomas Garnier <thgarnie@...gle.com>, Andy Lutomirski <luto@...nel.org>, "H. Peter Anvin" <hpa@...or.com>, Alexander Kuleshov <kuleshovmail@...il.com>, Josh Poimboeuf <jpoimboe@...hat.com>, borntraeger@...ibm.com, sds@...ho.nsa.gov, kirill.shutemov@...ux.intel.com, jroedel@...e.de, Kees Cook <keescook@...omium.org>, "Williams, Dan J" <dan.j.williams@...el.com>, Mark Salter <msalter@...hat.com>, Borislav Petkov <bp@...e.de>, Jonathan Corbet <corbet@....net>, matt@...eblueprint.co.uk, guangrong.xiao@...ux.intel.com, aneesh.kumar@...ux.vnet.ibm.com, Ingo Molnar <mingo@...nel.org>, Linus Torvalds <torvalds@...ux-foundation.org>, Dave Hansen <dave.hansen@...ux.intel.com>, toshi.kani@....com, alpopov@...ecurity.com, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Jan Beulich <JBeulich@...e.com>, Andrew Morton <akpm@...ux-foundation.org>, Boris Ostrovsky <boris.ostrovsky@...cle.com>, Denys Vlasenko <dvlasenk@...hat.com>, Peter Zijlstra <peterz@...radead.org>, dyoung@...hat.com, Thomas Gleixner <tglx@...utronix.de>, Dmitry Vyukov <dvyukov@...gle.com>, lv.zheng@...el.com, schwidefsky@...ibm.com, linux-tip-commits@...r.kernel.org Subject: Re: [tip:x86/boot] x86/mm: Enable KASLR for physical mapping memory regions 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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