From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x227/u3yJDxbLRACtoofdFCJ75hbl8FPRiPgNzWncvW9xZx3H439SgU3yU/dB47oZRLVIHo7B ARC-Seal: i=1; a=rsa-sha256; t=1516962014; cv=none; d=google.com; s=arc-20160816; b=zs58pUNw1kXKf7Na5NMsJsw96Yev5IsjMpSFnxIqhMee5qv3xtGp/IIl/Rf/XptI0o lt2erXh5ci80E2HWFGjNR7ZbUFmWr7VOOCpyDB7rEZ8+iGpGqnV06s3BTiZGYAX7yinT kyC+wg6r/isjKnIMQ8H7mjbN8+qYNXUbLBPdfxXGBuZe08ca/glPuNMlRhQSUM46Ebt8 gm21Q6iU/Gq0H65dM49YMRS4EnNn/thrSf2QPf2XR3LN4rizw0/PRoZoR6YUFjX4ePuv n9aitUNtlswnTgV5bJ3UwMmrGcWVZRkQftcEy7txqiDwL8tb5xvFXgGN/yrhTnO4Krsk MCAw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:date:face:references:in-reply-to:cc:to:from:subject :message-id:dkim-signature:arc-authentication-results; bh=uxmRFSuB2Tetetm/0vfAHf+GCyjYobIwh/RRnwgkMic=; b=ie1N/Hxc/e1yYyGXiKvlwqemZ88EZYoMgQW9aomCYRB5Na+zdxcdPQhd1omQH9A26i LNkqoZuMXYV2z2PRz8tn/90XUAqobxafyHb5MprwEdW4RBuSDAWXkezBOwhwrUR9GQ4o lpo/4gX9rY9Sp+Cr1F5nczpZi5eDxAZXYO8ksybXhSEXPk9sg+ibj37Q3Db2fRBEP18B UH3iS5v/794kgQuif+K49N8jajGBohIz+8+lQJdo22KGDOUFWSI2l8l+AyUTJiuMP4JE RrW8bdIn1s/0iGoxXJ1z675Xxx6G00a+LtPKzAeDGm2WeJAZOPSX4ncr0WxQ9yZ7mn/T 6VzQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=ilKH3Npg; spf=pass (google.com: best guess record for domain of batv+5c899106830c0475ba9f+5269+infradead.org+dwmw2@twosheds.srs.infradead.org designates 90.155.92.209 as permitted sender) smtp.mailfrom=BATV+5c899106830c0475ba9f+5269+infradead.org+dwmw2@twosheds.srs.infradead.org Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=ilKH3Npg; spf=pass (google.com: best guess record for domain of batv+5c899106830c0475ba9f+5269+infradead.org+dwmw2@twosheds.srs.infradead.org designates 90.155.92.209 as permitted sender) smtp.mailfrom=BATV+5c899106830c0475ba9f+5269+infradead.org+dwmw2@twosheds.srs.infradead.org Message-ID: <1516961987.30244.178.camel@infradead.org> Subject: Re: [PATCH 04/24] x86,nospec: Annotate indirect calls/jumps From: David Woodhouse To: Peter Zijlstra , Thomas Gleixner , Josh Poimboeuf Cc: linux-kernel@vger.kernel.org, Dave Hansen , Ashok Raj , Tim Chen , Andy Lutomirski , Linus Torvalds , Greg KH , Andrea Arcangeli , Andi Kleen , Arjan Van De Ven , Dan Williams , Paolo Bonzini , Jun Nakajima , Asit Mallick , Jason Baron In-Reply-To: <20180123152638.217996936@infradead.org> References: <20180123152539.374360046@infradead.org> <20180123152638.217996936@infradead.org> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-UmjlM6SIPBJuenv1OVmF" Date: Fri, 26 Jan 2018 10:19:47 +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 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1590397853592913916?= X-GMAIL-MSGID: =?utf-8?q?1590649961036751172?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --=-UmjlM6SIPBJuenv1OVmF Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2018-01-23 at 16:25 +0100, Peter Zijlstra wrote: > Annotate the indirect calls/jumps in the CALL_NOSPEC/JUMP_NOSPEC > alternatives. >=20 >=20 > Signed-off-by: Peter Zijlstra (Intel) Reviewed-by: David Woodhouse However... > =C2=A0/* > + * This should be used immediately before an indirect jump/call. It tell= s > + * objtool the subsequent indirect jump/call is vouched safe for retpoli= ne > + * builds. > + */ > +.macro ANNOTATE_RETPOLINE_SAFE > + .Lannotate_\@: > + .pushsection .discard.retpoline_safe > + _ASM_PTR .Lannotate_\@ > + .popsection > +.endm Didn't I just see one of those in patch 3? So this makes two... > @@ -143,6 +155,12 @@ > =C2=A0 ".long 999b - .\n\t" \ > =C2=A0 ".popsection\n\t" > =C2=A0 > +#define ANNOTATE_RETPOLINE_SAFE \ > + "999:\n\t" \ > + ".pushsection .discard.retpoline_safe\n\t" \ > + _ASM_PTR " 999b\n\t" \ > + ".popsection\n\t" > + > =C2=A0#if defined(CONFIG_X86_64) && defined(RETPOLINE) ... three. Now, I did briefly toy with the idea of using a .macro from both __ASSEMBLY__ and inline asm, making the latter work by means of=C2=A0 asm(".include \"asm/nospec-branch.h\"); In the end I just ended up with the __FILL_RETURN_BUFFER CPP macro which is used from both by other tricks. 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