From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x226aNTiG43Hdy5N5ecZUm8A01kuMd8oY1bZyU8FiZ9bjbzbgUMBtyuHwSPMhDDFfwtSvvgxw ARC-Seal: i=1; a=rsa-sha256; t=1517499151; cv=none; d=google.com; s=arc-20160816; b=lbfP6FTCY4/+s7gF1J+mRUHE0QqFzFUneCSlCJvgvX9xWDpdBkPDisEy7mepW1bXVy J0YLLcBQLPhofn/3W932RKoiauruiYXPhL53yl21r/vo+YRc+9Obg90MdXBS9f7EmsDc +tmJenbmcT9wiBMvNrEIq61FdiJNAvJD/o96NdDZECHZZBwvfha39DIL1HZHfjhvedEk qlcfFB72IqNMzTNjbOd0mhuDQ/cX5EmcOwS7QDdSlpgJawJjKreRpUDAlqva7+KQar6y xulITsP+r4i7oqnGWxpIMcyGZXTm6kEePoSYVdKUoZw6TNq8NvB8VIqY1yPp1IbXOlYe pvHw== 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=GblQt5x1oXvzisnOu4j/3/0xG8DdLED+oXzUU5xHhAw=; b=RHiHvGiqBSd7vC+Ne+TWsEJUclD976BU2wutA5NdO8/P0FWiN3kDzoW8iGsSdlCS7l l0xvvLX9JII7XV7JZqcxauTPF27Ayz5b+vbuOSaykslsRaP88jeOubO0iXTddPWdYAsk vcUuURIAtuzOsTxVGd+cj84OysGo7eZ2jYYjJe5j77ZB3DvtUvcynaQsq4cKTSLcVoe8 bXy79WZ7ZH/Ptq69L+6to759YHDnFFFO03eG1zJYGgPVMrR1/3ymHxXXdzQyqWqhiYA8 vw4nSpNhlAuTj1Faece1e35wzVYM66FDJTO/AQvUzUHHFuzXpmsnQEy5tGb+W4hy6wBV 5WgQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=idAF540O; spf=pass (google.com: best guess record for domain of batv+b6d91b464d3481d21e9d+5275+infradead.org+dwmw2@twosheds.srs.infradead.org designates 90.155.92.209 as permitted sender) smtp.mailfrom=BATV+b6d91b464d3481d21e9d+5275+infradead.org+dwmw2@twosheds.srs.infradead.org Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=idAF540O; spf=pass (google.com: best guess record for domain of batv+b6d91b464d3481d21e9d+5275+infradead.org+dwmw2@twosheds.srs.infradead.org designates 90.155.92.209 as permitted sender) smtp.mailfrom=BATV+b6d91b464d3481d21e9d+5275+infradead.org+dwmw2@twosheds.srs.infradead.org Message-ID: <1517499131.18619.317.camel@infradead.org> Subject: Re: [PATCH 0/7] objtool: retpoline validation From: David Woodhouse To: Josh Poimboeuf , Peter Zijlstra Cc: Thomas Gleixner , 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 In-Reply-To: <20180201152856.okzhqvdlledykzps@treble> References: <20180201143421.088202488@infradead.org> <20180201152856.okzhqvdlledykzps@treble> Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwBAMAAAClLOS0AAAAG1BMVEUHBwcUFBQpKSlGRkZhYWF9fX2Xl5eysrLMzMxFF+rXAAACaElEQVQ4y21UQXbbIBQE9wJALmAg6ToWON22FrhZthHgbvssUPathC7QWMful2JHSmtWwGg+zPxBCE0DU4QoJQgRgsg4w2gJjBNE8PjFBZgnQMBs+uZ1NQNQjZO3BV4AGDFC0f+l4DBG0VUAM4yv7SO8IgRdHXQ+A78HKL5OAeCfNQV5cHX8DsBUyIJKtYbt98BKaGNCKjfgFVkqYVLbkHKsRsbSCSa0T6npIqLrpRBgQKHUpQmgs9eEKaiUcooE8WWfCGVnBiUcn1uF2XhbfmN9apKnmMP2K4kizKkQWxuaVNOpU2cACIyxO1Po8ETHcXEDMVnozcejkAYA9iaD4pU0ZvNQ8VurNnTuFAYVtuIPUZW25PjDIjQAlGyffIiRQxoWAZBmJ0LTdW2Nyc0iP3DqRhxizvGJkBWZmyFVyZkddWzmBoIBVMpCCJ1CFzl98xav4VJKSSD45KbUT75ixikTphDSRh8+Uz7JLgUTAgAFwzqzjxc/nDY7WUApqY0OMdTwCKZSXplSKkgIRCHElCp8ZnhnKqXuwcNbk1L0VXE+I9alUXoHlLHl3mv7/dWQlJwtjREC7mu9L/U2jQyMUuO2EDS4q9Kl2ddm232bxIE5pjJuVwiljNn/Cfv25/T0cu5cZbwHGVq7h/zp0B4n3S99V/utD+Uo8BiGx9xCsOAV5z7/tjo4Z4z1Lvb90KZ7eFOoOeXOukqF2seo234YYuaQPpRP+cVZU5adT1Edun5Iz3z8fTz3+eSDh0Ip1c7zx1MaijGzTd/3MbRuBHz8cvcVgCMBRpOHvgu59WDhoat+nIZm+LWm9C/aaaGq5DCP9QAAAABJRU5ErkJggg== Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-FBTdQSd5Nie/rXjROtj/" Date: Thu, 01 Feb 2018 15:32:11 +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?1591210454988302775?= X-GMAIL-MSGID: =?utf-8?q?1591213190555217686?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --=-FBTdQSd5Nie/rXjROtj/ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2018-02-01 at 09:28 -0600, Josh Poimboeuf wrote: > On Thu, Feb 01, 2018 at 03:34:21PM +0100, Peter Zijlstra wrote: > >=20 > > There are the retpoline validation patches; they work with the > > __noretpoline > > thing from David. > Have you run this through 0-day bot yet?=C2=A0=C2=A0A manual awk/sed foun= d > another > one, which objtool confirms: >=20 > =C2=A0 drivers/watchdog/.tmp_hpwdt.o: warning: objtool: .text+0x24: > indirect call found in RETPOLINE build >=20 > And my search wasn't exhaustive so it would be good to sic 0-day bot on > it. We discussed that one. It's correct; we're calling into firmware so there's *no* point in retpolining that one. We need to set IBRS before any runtime calls into firmware, if we want to be safe. --=-FBTdQSd5Nie/rXjROtj/ 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 5PqFmWkbehLaEvbpNY7dmEAAeKh4klTzJzrr5AAzaCQ32cA2e3+DEIv5O5l9ViMIjy/JM+xMQrfX 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