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

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Message-ID: <20160816134205.GB11106@nazgul.tnic>
Date:	Tue, 16 Aug 2016 15:42:05 +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 07:31:20AM -0400, Brian Gerst wrote:
> That didn't provide any useful information.  However, when I boot with
> "nosmp", I do get an oops in load_microcode_amd().  I can't capture
> the oops message (no serial console), but it's being called from
> save_microcode_in_initrd_amd().

That is possible. KASLR already broke microcode loading on Intel. :-\

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?

-- 
Regards/Gruss,
    Boris.

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