Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934350AbeAKQKx (ORCPT + 1 other); Thu, 11 Jan 2018 11:10:53 -0500 Received: from twosheds.infradead.org ([90.155.92.209]:41384 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754076AbeAKQKw (ORCPT ); Thu, 11 Jan 2018 11:10:52 -0500 Message-ID: <1515687035.22302.360.camel@infradead.org> Subject: Re: [PATCH v2.1] x86/retpoline: Fill return stack buffer on vmexit From: David Woodhouse To: Josh Poimboeuf Cc: Peter Zijlstra , Andi Kleen , Paul Turner , LKML , Linus Torvalds , Greg Kroah-Hartman , Tim Chen , Dave Hansen , tglx@linutronix.de, Kees Cook , Rik van Riel , Andy Lutomirski , Jiri Kosina , gnomes@lxorguk.ukuu.org.uk, x86@kernel.org, bp@alien8.de, rga@amazon.de, thomas.lendacky@amd.com In-Reply-To: <20180111150419.2nsqst6qpifeq7k5@treble> References: <1515670638-8552-1-git-send-email-dwmw@amazon.co.uk> <20180111142038.sqhflhikcailqnwi@treble> <1515680912.22302.351.camel@infradead.org> <20180111143206.GA6176@hirez.programming.kicks-ass.net> <1515682437.22302.355.camel@infradead.org> <20180111150419.2nsqst6qpifeq7k5@treble> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-yC1QSsSTlOKfe/p6z2NM" Date: Thu, 11 Jan 2018 16:10:35 +0000 Mime-Version: 1.0 X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 X-SRS-Rewrite: SMTP reverse-path rewritten from by twosheds.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: --=-yC1QSsSTlOKfe/p6z2NM Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2018-01-11 at 09:04 -0600, Josh Poimboeuf wrote: >=20 > > How about this one then (with ANNOTATE_NOSPEC_ALTERNATIVE): > >=C2=A0 > > -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0asm volatile (ALTERNATIVE(""= , > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0asm volatile (ALTERNATIVE("j= mp " alt_end_marker "f", > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0__stringify(__F= ILL_RETURN_BUFFER(%0, %1, _%=3D)), > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0X86_FEATURE_RET= POLINE) > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0: "=3Dr" (du= mmy), ASM_CALL_CONSTRAINT : : "memory" ); >=20 > Looks good to me. >=20 > Another IRC discussion was that Boris may eventually add a feature to > the alternatives code to automatically insert such a jump if there are a > lot of nops. OK, v3 sent out with that. I've just manually put in a jump round it (less hackishly than the alt_end_marker one) in the oldinstr for now. This wants rolling into your objtool fixes: --- a/arch/x86/include/asm/nospec-branch.h +++ b/arch/x86/include/asm/nospec-branch.h @@ -119,7 +119,8 @@ =C2=A0=C2=A0=C2=A0*/ =C2=A0.macro FILL_RETURN_BUFFER reg:req nr:req ftr:req =C2=A0#ifdef CONFIG_RETPOLINE - ALTERNATIVE "jmp .Lskip_rsb_\@", \ + ANNOTATE_NOSPEC_ALTERNATIVE + ALTERNATIVE "jmp .Lskip_rsb_\@", \ =C2=A0 __stringify(__FILL_RETURN_BUFFER(\reg,\nr,%_ASM_SP,\@)) \ =C2=A0 \ftr =C2=A0.Lskip_rsb_\@: @@ -149,6 +150,7 @@ =C2=A0# define THUNK_TARGET(addr) [thunk_target] "r" (addr) =C2=A0 =C2=A0#elif defined(CONFIG_X86_32) && defined(CONFIG_RETPOLINE) +# define ANNOTATE_NOSPEC_ALTERNATIVE =C2=A0/* =C2=A0 * For i386 we use the original ret-equivalent retpoline, because =C2=A0 * otherwise we'll run out of registers. 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