From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x2242GiASSq0NfRbOL9Y1O0JtjQDlHgmzMvpUJ/nF0RWRL3gb7tufCXnTJFmO2FiJv+L1KpSj ARC-Seal: i=1; a=rsa-sha256; t=1516991218; cv=none; d=google.com; s=arc-20160816; b=a5Y5il0BwEAi2NOgyX9CsFrYkV3DT4fnBhp9gXD4w9Lt/WlQ5Z0Cs1pqjjl+KzMH+J v4GrUDb4WlDqX2HxFAPyJ7ZAWSqn7ria+G8N7FQ8NydQUWSTfkurfJCRbfuHTzLgTVxq NOb1DQdMXEpB9jXF0rQKdrqskxwW8Lfrpi8+vUqShVxNMLGxzg8s90Dkw2Eki2X6g5cF osYrLeNj/8ejOVX8t69VgWwRzcmaMy+HJCw/ZEBXLc/jD3Kr7DXiKnZI37nZ5o58OlNk CSRzg4HecB7ixaeVIu/QBYX9yx5oz8PL6ZsB1vGe4txhBtk9nDlnddJm7dmSA/t0sF1A nEbA== 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=+qWHlsRDgLfChAg3yscnaDe8RTg8LGBpnHUHHqAEQNQ=; b=so2UKcmzQSpokVs+UR/U2Qh9K5zY8t7jdkJs/93hoJKpyy4CX4IbL8acHwDyr6WoWX 7MrMUu35Wh+JRbFrk3Ubdm1uL1QjNRBbWm+Te8mJ1cx4uZNBrHBukAEeadYiWv9q+imq RI4aL+X9aCmxxPeBVnLuSrTfeoECKMuPpEfM/JkWRyicEje4NgYqif5P3VgscFEsBJ6k HRvu3eqrtzwbeVkXxE81Me9lAk/o6UxaJ9uagpyb8GGvRL3FmXBf++HereSHnIRdaic8 rv0ZZ+JnoTsMrXtwSi64CNTmdNKhxfQUWkJfZr7vhSE1i43KcKuliOAEuNssDqmiHR0G QlnA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=C8DoAR1b; 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=C8DoAR1b; 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: <1516991212.30244.262.camel@infradead.org> Subject: Re: [RFC 09/10] x86/enter: Create macros to restrict/unrestrict Indirect Branch Speculation From: David Woodhouse To: Arjan van de Ven , Andi Kleen , Linus Torvalds Cc: Dave Hansen , Liran Alon , Laura Abbott , Andrew Lutomirski , Janakarajan Natarajan , Borislav Petkov , "Mallick, Asit K" , Radim =?UTF-8?Q?Kr=C4=8Dm=C3=A1=C5=99?= , KarimAllah Ahmed , Peter Anvin , Jun Nakajima , Ingo Molnar , the arch/x86 maintainers , Ashok Raj , "Van De Ven, Arjan" , Tim Chen , Paolo Bonzini , Linux Kernel Mailing List , Peter Zijlstra , Thomas Gleixner , Greg Kroah-Hartman , Masami Hiramatsu , Tom Lendacky , Dan Williams , Joerg Roedel , Andrea Arcangeli , KVM list In-Reply-To: <07daf763-cd29-5d1c-1488-1fcb5b440347@linux.intel.com> References: <7c0b0879-3448-43e4-8380-4708fc787113@default> <50c5d627-8975-184b-b50f-4cc02c5816c5@intel.com> <1516957886.30244.161.camel@infradead.org> <20180126175901.GL26209@tassilo.jf.intel.com> <1516990288.30244.253.camel@infradead.org> <07daf763-cd29-5d1c-1488-1fcb5b440347@linux.intel.com> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-t7QLQsHP2bcxj8mPi59n" Date: Fri, 26 Jan 2018 18:26:52 +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?1590140582166248265?= X-GMAIL-MSGID: =?utf-8?q?1590680583737193144?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --=-t7QLQsHP2bcxj8mPi59n Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2018-01-26 at 10:12 -0800, Arjan van de Ven wrote: > On 1/26/2018 10:11 AM, David Woodhouse wrote: > >=C2=A0 > > I am *actively* ignoring Skylake right now. This is about per-SKL > > userspace even with SMEP, because we think Intel's document lies to us. >=20 > if you think we lie to you then I think we're done with the conversation? >=20 > Please tell us then what you deploy in AWS for your customers ? >=20 > or show us research that shows we lied to you? As you know well, I mean "we think Intel's document is not correct".=C2=A0 The evidence which made us suspect that is fairly clear in the last few emails in this thread =E2=80=94 it's about the BTB/RSB only having the low = bits of the target, which would mean that userspace *can* put malicious targets into the RSB, regardless of SMEP. --=-t7QLQsHP2bcxj8mPi59n 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 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