Date: Thu, 5 Jan 2017 11:00:20 -0800 From: Thomas Garnier <thgarnie@...gle.com> To: Arjan van de Ven <arjan@...ux.intel.com> Cc: Ingo Molnar <mingo@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H . Peter Anvin" <hpa@...or.com>, Kees Cook <keescook@...omium.org>, Borislav Petkov <bp@...en8.de>, Andy Lutomirski <luto@...nel.org>, Dave Hansen <dave@...1.net>, Chen Yucong <slaoub@...il.com>, Paul Gortmaker <paul.gortmaker@...driver.com>, Andrew Morton <akpm@...ux-foundation.org>, Masahiro Yamada <yamada.masahiro@...ionext.com>, Sebastian Andrzej Siewior <bigeasy@...utronix.de>, Anna-Maria Gleixner <anna-maria@...utronix.de>, Boris Ostrovsky <boris.ostrovsky@...cle.com>, Rasmus Villemoes <linux@...musvillemoes.dk>, Michael Ellerman <mpe@...erman.id.au>, Juergen Gross <jgross@...e.com>, Richard Weinberger <richard@....at>, "the arch/x86 maintainers" <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>, Kernel Hardening <kernel-hardening@...ts.openwall.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Peter Zijlstra <a.p.zijlstra@...llo.nl> Subject: Re: [RFC] x86/mm/KASLR: Remap GDTs at fixed location On Thu, Jan 5, 2017 at 10:56 AM, Arjan van de Ven <arjan@...ux.intel.com> wrote: > On 1/5/2017 8:40 AM, Thomas Garnier wrote: >> >> Well, it happens only when KASLR memory randomization is enabled. Do >> you think it should have a separate config option? > > > no I would want it a runtime option.... "sgdt from ring 3" is going away > with UMIP (and is already possibly gone in virtual machines, see > https://lwn.net/Articles/694385/) and for those cases it would be a shame > to lose the randomization > That's correct. When UMIP is enabled, we should disable fixed location for both GDT and IDT. Glad to do that when UMIP support is added. -- Thomas
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