From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: ACJfBotPKkLrBuy63n0jOmw35XdVCQxG6S5hFZjWlWPpBIyHiWEMhTMThZ+V5EZOEmA/Vbfj4cnO ARC-Seal: i=1; a=rsa-sha256; t=1515152597; cv=none; d=google.com; s=arc-20160816; b=xYifrRfDXCrZOQwpcnabuwOuuhF9l0JselFRiR/Tqy0qEqE++HG6lK7j0pQ/TrzUCE suaQ9C/H5xHNFMfFXzNYZFprDC2op5ciFNoYtDGFUNSMvjRtlc/mEshpsjjWGk1pKQ0O axRlSQibxku1f84vQyQNRbWv19KuAZdWU8thGUn/WLzlz1wdVxnk/EDzZY6U8TzcLENv mG0bf4w0wHCgE/wHkhCQQrwKG4Uf6qhk5SMsHFngiz6aj9i35geGjkqBRgOrxiWKOe65 zpZYvCvaPtSbcemkKwovtfkbJ/vCvvxVnMJ5fqso1RivRItV2H9fWpdIaHr3eec9usq6 LVog== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:accept-language:in-reply-to:references:message-id:date :thread-index:thread-topic:subject:cc:to:from:mime-version :dkim-signature:arc-authentication-results; bh=41vprObwV5N03IDHirBMoAT9gtIVZKO3AH9mnLwyLiQ=; b=IHKeg07V8Jk0mT8l0R846QmO7uIagqSOXTYP8m8LJ6SR2+bMnrsIN6eHHqIbao7jjK ihkob7R5F+VN3VZ3fn59k+u5XPPl0ToiA6R8r1/o0mQcwsnqMQouNvh5VQNyvZOg9+XK 1BwvYIksDlDJzTkF/0p42XLeuIFAuu819cmBa7u9ud/EtT/Z/zLa4kglr0RAFEVEGDsF 3ByP53u7pG5STcCYVwXnif8cf3Gi42HoCIH7dLw6QXZPRn98rz5bpYlGHq+Bwj88HBQ4 udMNDDiF2EQDfp6vTJeaWmyFM+/+/FCl1Zr5itsYlIiV6VTxqnIzI5doqYJwd9VWaonQ qPcQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@amazon.co.uk header.s=amazon201209 header.b=SUaLC0aN; spf=pass (google.com: domain of prvs=536af240d=dwmw@amazon.co.uk designates 207.171.190.10 as permitted sender) smtp.mailfrom=prvs=536af240d=dwmw@amazon.co.uk; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=amazon.co.uk Authentication-Results: mx.google.com; dkim=pass header.i=@amazon.co.uk header.s=amazon201209 header.b=SUaLC0aN; spf=pass (google.com: domain of prvs=536af240d=dwmw@amazon.co.uk designates 207.171.190.10 as permitted sender) smtp.mailfrom=prvs=536af240d=dwmw@amazon.co.uk; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=amazon.co.uk X-Amazon-filename: smime.p7s X-IronPort-AV: E=Sophos;i="5.46,318,1511827200"; d="p7s'?scan'208";a="713617347" Content-Type: multipart/mixed; boundary="===============0214181625114307914==" MIME-Version: 1.0 From: "Woodhouse, David" To: "pjt@google.com" , "luto@kernel.org" CC: "linux-kernel@vger.kernel.org" , "arjan.van.de.ven@intel.com" , "peterz@infradead.org" , "tim.c.chen@linux.intel.com" , "torvalds@linux-foundation.org" , "tglx@linuxtronix.de" , "riel@redhat.com" , "keescook@google.com" , "gnomes@lxorguk.ukuu.org.uk" , "dave.hansen@intel.com" , "jikos@kernel.org" , "gregkh@linux-foundation.org" Subject: Re: [RFC] Retpoline: Binary mitigation for branch-target-injection (aka "Spectre") Thread-Topic: [RFC] Retpoline: Binary mitigation for branch-target-injection (aka "Spectre") Thread-Index: AQHThTwenZWYSjT7Z0aSPA2nMSEEDqNjcsaAgAByM4CAATZZAIAADu4A Date: Fri, 5 Jan 2018 11:43:11 +0000 Message-ID: <1515152590.29312.118.camel@amazon.co.uk> References: <1515058213.12987.89.camel@amazon.co.uk> <20180105104944.GB253582@google.com> In-Reply-To: <20180105104944.GB253582@google.com> Accept-Language: en-GB, en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.43.60.176] MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1588652491457831966?= X-GMAIL-MSGID: =?utf-8?q?1588752650234442823?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --===============0214181625114307914== Content-Language: en-US Content-Type: multipart/signed; micalg=sha-256; protocol="application/x-pkcs7-signature"; boundary="=-v12nReUSZ64O95hR0+jb" --=-v12nReUSZ64O95hR0+jb Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2018-01-05 at 02:49 -0800, Paul Turner wrote: >=20 >=20 > While the potential incompatibility is unfortunate; I'm not sure it makes= a > significant adoption to the adoption rate of CET. There is no incompatibility. Nothing will have CET that doesn't have IBRS_ATT (and hence the retpoline alternative'd out into a bare jmp again). --=-v12nReUSZ64O95hR0+jb Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEE4w ggUuMIIEFqADAgECAhEApEtL31g6H7ROXdOiQnA9RjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG A1UEChMRQ09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhl bnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0EwHhcNMTcxMjIxMDAwMDAwWhcNMTgxMjIxMjM1 OTU5WjAiMSAwHgYJKoZIhvcNAQkBFhFkd213QGFtYXpvbi5jby51azCCASIwDQYJKoZIhvcNAQEB BQADggEPADCCAQoCggEBAKdGKgXuwKMg2r+i/4BZZC0ddRxNq3xIKTakie/VCSzoO7P17A36ZzUc VMEYPfqDt/65xoc6Tdih+qkY2pNDppZ1DZ8mVrAX6O2O60ZhmXB60wMoDvXPZInvkMOW4drqnje/ 7/NOypn/XQAY+ln4KT+3tHG3TfryyJFMedqC/r29KJlCeeCxIzdtq2j5mN42tvPVv4+p+Kr77uui 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