From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: ACJfBovnYggUHr/xQ5CEgmGL2yFIubGawxaK+DYwkZa63cABdfQ+AySEJDPDgDg2y1YACRoHvkBa ARC-Seal: i=1; a=rsa-sha256; t=1516280599; cv=none; d=google.com; s=arc-20160816; b=hjEMP+S1JmhICijPezfgazQTqkoF96cftIRACH1ARODbLhqxUH+KBUkeQDIMH4b9Bf LtbrPydb2KmdEt8uIJWSnkyEp7nH5Ca8twFACYlIlgq/KLP2jWCfxMqno/QJn55Olpg9 MMzdQfZwrtokjzt5/XxUl1dqgghizPpk8iy0FF21x5jTb3bmgt08RSQzq/oMDQnzvCEO D+8UD2VQofriMBA+iY5dSNFSp0SmikSLYI99GM/yT924XFUO28mQd65usuJfl1uiVQhm UDrTXKRLm92dxuSCUnUwtWtuiclvCncWEJLbZoWKc6N3+qMk/Pg5CPvUIn9PPl3cz/MB VtTQ== 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=gJNdAWVUjzYJqW//jdC0y30bq+27Euq9A8anR/n/qPo=; b=dheyqDQhDOIm8hT5eB9AcTCbWBKTQaJvblOQ3UWyMF3I4ge0Nz8xtTI5237XqcjD92 9XFeE21jmdG3SADrhs8Au8FllJ64AqNsUKITy6jXciF3itDsGNS98zqsephAoQotBN9X HQKP74HDYNVOe3/2OSWRlusJ/fW+09PidmHY1XDxMahzXMivbUUQY87g41jRUCYbiZpg uqQJdlydq15XyP63kBTGmRxB9cqr9qqc0C9C9a6/Dodwu1geOYCqD6gpRWfWuKBkcIdk 3x9E5oenbRmVRyt3eI7qZ6PV5App8uESnhW/cgPOMc+19bAYoDnYY77WH6bGtH6wuz8M xa7Q== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=q7WVbRX6; spf=pass (google.com: best guess record for domain of batv+6a4208d662bc5f5a85c0+5261+infradead.org+dwmw2@twosheds.srs.infradead.org designates 2001:8b0:10b:1:21d:7dff:fe04:dbe2 as permitted sender) smtp.mailfrom=BATV+6a4208d662bc5f5a85c0+5261+infradead.org+dwmw2@twosheds.srs.infradead.org Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=q7WVbRX6; spf=pass (google.com: best guess record for domain of batv+6a4208d662bc5f5a85c0+5261+infradead.org+dwmw2@twosheds.srs.infradead.org designates 2001:8b0:10b:1:21d:7dff:fe04:dbe2 as permitted sender) smtp.mailfrom=BATV+6a4208d662bc5f5a85c0+5261+infradead.org+dwmw2@twosheds.srs.infradead.org Message-ID: <1516280587.4937.128.camel@infradead.org> Subject: Re: [PATCH v1 tip/master 0/3] kprobes/x86: retpoline: Fix kprobes for retpoline From: David Woodhouse To: Andi Kleen , Masami Hiramatsu Cc: Ingo Molnar , linux-kernel@vger.kernel.org, Greg Kroah-Hartman , Arjan van de Ven , Peter Zijlstra , Ananth N Mavinakayanahalli , Thomas Gleixner , "H . Peter Anvin" In-Reply-To: <20180118130157.GE7844@tassilo.jf.intel.com> References: <151627684798.24682.2979775081582774869.stgit@devbox> <20180118130157.GE7844@tassilo.jf.intel.com> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-voUYsPm9TKRDcZERUoe4" Date: Thu, 18 Jan 2018 14:03:07 +0100 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?1589931539308254743?= X-GMAIL-MSGID: =?utf-8?q?1589935445484929994?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --=-voUYsPm9TKRDcZERUoe4 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2018-01-18 at 05:01 -0800, Andi Kleen wrote: > >=20 > > Side effect: [1/3] will move __x86_indirect_thunk_* functions > > in kernel text area. Of course those functions were in the > > .text area, but placed in right after _etext. This just moves > > it right before the _etext. > I assume you tested that with page table isolation on? >=20 > The thunks need to be accessible from the trampoline. I thought we put it inline in the trampoline. --=-voUYsPm9TKRDcZERUoe4 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 3PZ0chY1PaVWjg59d4Uno+5LRDbgCnPkKJX4ysBGadibjBGQGJEZCjh94iiEebn2KsRLvtrJ72Ph 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