From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x224l39nM/9+/GfMoF6XmJA4E0gufIG4ZZK/s4Q7RClsa5bUOsVPu/EIOwnxDsSXZwHccM+/1 ARC-Seal: i=1; a=rsa-sha256; t=1516903482; cv=none; d=google.com; s=arc-20160816; b=f2sAU1kgpcwqhNXOB7QhkUcrtGk15ZhvlFE3pQLg6ysKWhVBUdBvFiGDFhck3ZDijl 5EA7CUtVXm6kROfwLC03HuLjRW5PmjcNOdmBVB/DhukOWNs+w/kyqvRJFcXRBEaDbBVo f7ysshl4kykibNYjKgw8NDKsiNFu0KZLI3nASRCxKXk4Xgi/o32MQW8/Le/oJ7QKhAXd zh0wUQMVi5PPEhLDc0A9u4y9/WuIXpXLX5Bf6zW6tBZ3hsY7wQhXdYfgqisYrsL5KCqA bi8RSNzHhFWJTjMy8QAXBrH1FkXwTd9RFsfIc6NbmQV5aQzDd2EMd9j41VgSVMpP+iTq 1TuQ== 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=lDdQXC99LGyc3CaX5nTcjfO3XE5mXTjvWz7viIaJPQI=; b=Xax02fxp84XC4SEg9w+rE+83gNHxTWBKtFtdwoUXn+srY317DfKW32RsRus3emns2k oJNvFE8KflX7dlmb0g873U9r7Zm1B9fD0wYofa1cw9HmP43Kpo6Hd3XbXaVeEeLLQfVR qXgELQ7DAc8aV61SzdnYphgpUolM2jJdVWxV0d4ySkRQUWrHLQQr/TBj2PG8n4hp/HBX 1zIWkOU4lHxNfinNr6WJ8gM3vZD4LNYAOlPHKLizSWZ93UlE+dlEmUGw1QWUCL5zY1JN 6775yOfT/epeQJMOqKZzRekdosFA8EiDM4M/GzbapYPyhZWgTSUHiSdsuD1h5QkVX+E2 dJoQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=JghqtLwN; spf=pass (google.com: best guess record for domain of batv+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org designates 2001:8b0:10b:1:21d:7dff:fe04:dbe2 as permitted sender) smtp.mailfrom=BATV+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=JghqtLwN; spf=pass (google.com: best guess record for domain of batv+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org designates 2001:8b0:10b:1:21d:7dff:fe04:dbe2 as permitted sender) smtp.mailfrom=BATV+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org Message-ID: <1516903463.30244.148.camel@infradead.org> Subject: Re: [tip:x86/pti] x86/retpoline: Fill return stack buffer on vmexit From: David Woodhouse To: Borislav Petkov Cc: Josh Poimboeuf , tim.c.chen@linux.intel.com, pjt@google.com, jikos@kernel.org, gregkh@linux-foundation.org, dave.hansen@intel.com, mingo@kernel.org, riel@redhat.com, luto@amacapital.net, torvalds@linux-foundation.org, ak@linux.intel.com, keescook@google.com, peterz@infradead.org, tglx@linutronix.de, hpa@zytor.com, linux-kernel@vger.kernel.org, linux-tip-commits@vger.kernel.org In-Reply-To: <20180125175334.7wlin4ftnqkq2fil@pd.tnic> References: <1515755487-8524-1-git-send-email-dwmw@amazon.co.uk> <20180125120743.ey32gvl5mjam4r2s@pd.tnic> <1516882849.30244.94.camel@infradead.org> <20180125124554.vdx7rrnfrxrzl2ng@pd.tnic> <20180125151024.bidjr26r667vs7h5@treble> <20180125155110.mw655b7fwgm7qqc7@pd.tnic> <1516896198.30244.133.camel@infradead.org> <20180125165646.ytc4upthpaqtwi45@treble> <1516899639.30244.145.camel@infradead.org> <20180125175334.7wlin4ftnqkq2fil@pd.tnic> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-jOVTpVcJRIuahQ1CLc2T" Date: Thu, 25 Jan 2018 18:04:23 +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?1589334225298273984?= X-GMAIL-MSGID: =?utf-8?q?1590588585514839127?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --=-jOVTpVcJRIuahQ1CLc2T Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2018-01-25 at 18:53 +0100, Borislav Petkov wrote: >=20 > So forget the KABI angle and think: simpler, cleaner, more readable > macros. >=20 > Oh, and David, if while doing so I manage to add the alignment, then > *that* is even better. >=20 > Win-win-effing-win situation! Yep, I'll buy that. But first we need Josh to work out what he's having for lunch. Although just another marker to tell objtool "ignore this whole function" might be sufficient to allow us to have an out-of-line RSB- stuffing function. --=-jOVTpVcJRIuahQ1CLc2T Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEFQw ggUxMIIEGaADAgECAhBNRhEyk/HZ7naOeTHWrzuAMA0GCSqGSIb3DQEBCwUAMIGXMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRowGAYD VQQKExFDT01PRE8gQ0EgTGltaXRlZDE9MDsGA1UEAxM0Q09NT0RPIFJTQSBDbGllbnQgQXV0aGVu dGljYXRpb24gYW5kIFNlY3VyZSBFbWFpbCBDQTAeFw0xNzEyMjEwMDAwMDBaFw0xODEyMjEyMzU5 NTlaMCQxIjAgBgkqhkiG9w0BCQEWE2R3bXcyQGluZnJhZGVhZC5vcmcwggEiMA0GCSqGSIb3DQEB AQUAA4IBDwAwggEKAoIBAQDgzLNWa18DNpGUj/ZeH0Sgz53ESIbzdPw3OJeuNP6jZhxZojbyfxbM hETscxI/Hj6UZ4a7sHm5BkVjlsB1Af2Za/PXUt8MmLAcPMHkMPGunvkUibEvblDvpqMkQZlaZM+t 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