[{"id":1771427,"web_url":"http://patchwork.ozlabs.org/comment/1771427/","msgid":"","list_archive_url":null,"date":"2017-09-19T22:02:22","subject":"Re: [PATCH v3 0/3] arm64: Add CONFIG_KUSER_HELPERS","submitter":{"id":10641,"url":"http://patchwork.ozlabs.org/api/people/10641/","name":"Kees Cook","email":"keescook@chromium.org"},"content":"On Mon, Sep 11, 2017 at 8:26 AM, Mark Salyzyn wrote:\n> Make it possible to disable the kuser helpers by adding a KUSER_HELPERS\n> config option (enabled by default). When disabled, all kuser\n> helpers-related code is removed from the kernel and no mapping is done\n> at the fixed high address (0xffff0000); any attempt to use a kuser\n> helper from a 32-bit process will result in a segfault.\n>\n> Signed-off-by: Mark Salyzyn \n>\n> v2:\n> - vectors_page and compat_vdso_spec as array of 2\n> - free sigpage if vectors allocation failed\n> - adjust makefile so one line for each of the assembler source modules\n> - split off assembler changes to a new previous patch in series to reduce churn\n> - modify slightly the feature documentation to reduce its reach\n> - modify slightly the feature documentation to rationalize the yes default.\n> - There are more ifdefs as a result of the rebase.\n>\n> v3:\n> - rebase (minor conflicts)\n\nThis looks great to me. I'd love to see kuser helpers gone. :)\n\nCatalin, Will, does this need anything else?\n\n-Kees","headers":{"Return-Path":"","X-Original-To":"incoming-imx@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming-imx@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=lists.infradead.org\n\t(client-ip=65.50.211.133; helo=bombadil.infradead.org;\n\tenvelope-from=linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org;\n\treceiver=)","ozlabs.org; dkim=pass (2048-bit key;\n\tunprotected) header.d=lists.infradead.org\n\theader.i=@lists.infradead.org header.b=\"qzuqZtk2\"; \n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n\tunprotected) header.d=google.com header.i=@google.com\n\theader.b=\"nD96Ymcb\"; \n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n\tunprotected) header.d=chromium.org header.i=@chromium.org\n\theader.b=\"f3wD8Tf/\"; dkim-atps=neutral"],"Received":["from bombadil.infradead.org (bombadil.infradead.org\n\t[65.50.211.133])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256\n\tbits)) (No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xxcLg4bw0z9sBW\n\tfor ;\n\tWed, 20 Sep 2017 08:02:51 +1000 (AEST)","from localhost ([127.0.0.1] helo=bombadil.infradead.org)\n\tby bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux))\n\tid 1duQbQ-0006Fw-Hi; 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charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Sender":"\"linux-arm-kernel\" ","Errors-To":"linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org","List-Id":"linux-imx-kernel.lists.patchwork.ozlabs.org"}},{"id":1771700,"web_url":"http://patchwork.ozlabs.org/comment/1771700/","msgid":"<20170920091555.GA3782@arm.com>","list_archive_url":null,"date":"2017-09-20T09:15:56","subject":"Re: [PATCH v3 0/3] arm64: Add CONFIG_KUSER_HELPERS","submitter":{"id":7916,"url":"http://patchwork.ozlabs.org/api/people/7916/","name":"Will Deacon","email":"will.deacon@arm.com"},"content":"On Tue, Sep 19, 2017 at 03:02:22PM -0700, Kees Cook wrote:\n> On Mon, Sep 11, 2017 at 8:26 AM, Mark Salyzyn wrote:\n> > Make it possible to disable the kuser helpers by adding a KUSER_HELPERS\n> > config option (enabled by default). When disabled, all kuser\n> > helpers-related code is removed from the kernel and no mapping is done\n> > at the fixed high address (0xffff0000); any attempt to use a kuser\n> > helper from a 32-bit process will result in a segfault.\n> >\n> > Signed-off-by: Mark Salyzyn \n> >\n> > v2:\n> > - vectors_page and compat_vdso_spec as array of 2\n> > - free sigpage if vectors allocation failed\n> > - adjust makefile so one line for each of the assembler source modules\n> > - split off assembler changes to a new previous patch in series to reduce churn\n> > - modify slightly the feature documentation to reduce its reach\n> > - modify slightly the feature documentation to rationalize the yes default.\n> > - There are more ifdefs as a result of the rebase.\n> >\n> > v3:\n> > - rebase (minor conflicts)\n> \n> This looks great to me. I'd love to see kuser helpers gone. :)\n> \n> Catalin, Will, does this need anything else?\n\nI haven't had chance to look at the patches yet (buried in other stuff), but\nI aim to get to it in the next couple of weeks.\n\nWill","headers":{"Return-Path":"","X-Original-To":"incoming-imx@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming-imx@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=lists.infradead.org\n\t(client-ip=65.50.211.133; helo=bombadil.infradead.org;\n\tenvelope-from=linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org;\n\treceiver=)","ozlabs.org; dkim=pass (2048-bit key;\n\tunprotected) header.d=lists.infradead.org\n\theader.i=@lists.infradead.org\n\theader.b=\"hjDI4jiU\"; dkim-atps=neutral"],"Received":["from bombadil.infradead.org (bombadil.infradead.org\n\t[65.50.211.133])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256\n\tbits)) (No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3xxvHh3cnkz9sNw\n\tfor ;\n\tWed, 20 Sep 2017 19:16:16 +1000 (AEST)","from localhost ([127.0.0.1] helo=bombadil.infradead.org)\n\tby bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux))\n\tid 1dub75-0003zx-7F; 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bh=fImHJ+z/FQKtcGaP83ujelljhPc+bnNWlZ6+1DwCodM=;\n\tb=hjDI4jiUjrKgqm\n\trYT/4PLgmUV3byolMh5VWpRd8c/vgRAjv6AiSr66motWxniPTF/L6ALnuHQuqt/E2ae5cIN2dquz0\n\t2aXM1zOlZfaGyVQ9enlK/wi5pKfTr9DgdEN9fzNR/XVBEdQ92/xvYdLNOYG9SoDvoWNiFbbHBxZEO\n\tyJRRll0rLTkGr+4NLSMnUPWO9fLO9cGr+j0eDTxJYeJmagZn7dr67diRsC/ZtdSxxJlj8QH0g1C29\n\t7ySGhac+FwefCZsiYxsm0EJu3WGsOnAjVvYDGelC+bsIXKX6NDnBHyDJcrl6RwyuT84zbNzvzZZ5A\n\t8oprGqN7KMIpbD3dqmEg==;","Date":"Wed, 20 Sep 2017 10:15:56 +0100","From":"Will Deacon ","To":"Kees Cook ","Subject":"Re: [PATCH v3 0/3] arm64: Add CONFIG_KUSER_HELPERS","Message-ID":"<20170920091555.GA3782@arm.com>","References":"<20170911152635.95367-1-salyzyn@android.com>\n\t","MIME-Version":"1.0","Content-Disposition":"inline","In-Reply-To":"","User-Agent":"Mutt/1.5.23 (2014-03-12)","X-CRM114-Version":"20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 ","X-CRM114-CacheID":"sfid-20170920_021606_015473_CC57E42F ","X-CRM114-Status":"GOOD ( 16.72 )","X-Spam-Score":"-6.9 (------)","X-Spam-Report":"SpamAssassin version 3.4.1 on bombadil.infradead.org summary:\n\tContent analysis details: (-6.9 points)\n\tpts rule name description\n\t---- ----------------------\n\t--------------------------------------------------\n\t-5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at http://www.dnswl.org/,\n\thigh trust [217.140.101.70 listed in list.dnswl.org]\n\t-0.0 SPF_PASS SPF: sender matches SPF record\n\t-0.0 RP_MATCHES_RCVD Envelope sender domain matches handover relay\n\tdomain\n\t-1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n\t[score: 0.0000]","X-BeenThere":"linux-arm-kernel@lists.infradead.org","X-Mailman-Version":"2.1.21","Precedence":"list","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Cc":"Mark Rutland , Jisheng Zhang ,\n\tArd Biesheuvel ,\n\tJohn Stultz ,\n\tAKASHI Takahiro ,\n\tPeter Zijlstra ,\n\tCatalin Marinas , kevin.brodsky@arm.com,\n\tLKML , Mark Salyzyn , \n\tChristian Borntraeger ,\n\tMichal Marek , James Morse ,\n\t\"linux-arm-kernel@lists.infradead.org\"\n\t, \n\tcredmonster@gmail.com, Laura Abbott ,\n\tIngo Molnar , zijun_hu ,\n\tDave Martin ","Content-Type":"text/plain; charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Sender":"\"linux-arm-kernel\" ","Errors-To":"linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org","List-Id":"linux-imx-kernel.lists.patchwork.ozlabs.org"}},{"id":1796852,"web_url":"http://patchwork.ozlabs.org/comment/1796852/","msgid":"<065fd365-4635-ddc7-b683-59a5cb16be8f@android.com>","list_archive_url":null,"date":"2017-10-31T18:42:39","subject":"Re: [PATCH v3 0/3] arm64: Add CONFIG_KUSER_HELPERS","submitter":{"id":66452,"url":"http://patchwork.ozlabs.org/api/people/66452/","name":"Mark Salyzyn","email":"salyzyn@android.com"},"content":"On 09/20/2017 02:15 AM, Will Deacon wrote:\n> On Tue, Sep 19, 2017 at 03:02:22PM -0700, Kees Cook wrote:\n>> On Mon, Sep 11, 2017 at 8:26 AM, Mark Salyzyn wrote:\n>>> Make it possible to disable the kuser helpers by adding a KUSER_HELPERS\n>>> config option (enabled by default). When disabled, all kuser\n>>> helpers-related code is removed from the kernel and no mapping is done\n>>> at the fixed high address (0xffff0000); any attempt to use a kuser\n>>> helper from a 32-bit process will result in a segfault.\n>>>\n>>> Signed-off-by: Mark Salyzyn \n>>>\n>>> v2:\n>>> - vectors_page and compat_vdso_spec as array of 2\n>>> - free sigpage if vectors allocation failed\n>>> - adjust makefile so one line for each of the assembler source modules\n>>> - split off assembler changes to a new previous patch in series to reduce churn\n>>> - modify slightly the feature documentation to reduce its reach\n>>> - modify slightly the feature documentation to rationalize the yes default.\n>>> - There are more ifdefs as a result of the rebase.\n>>>\n>>> v3:\n>>> - rebase (minor conflicts)\n>> This looks great to me. I'd love to see kuser helpers gone. :)\n>>\n>> Catalin, Will, does this need anything else?\n> I haven't had chance to look at the patches yet (buried in other stuff), but\n> I aim to get to it in the next couple of weeks.\n>\n> Will\n\nPing?","headers":{"Return-Path":"","X-Original-To":"incoming-imx@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming-imx@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=lists.infradead.org\n\t(client-ip=65.50.211.133; helo=bombadil.infradead.org;\n\tenvelope-from=linux-arm-kernel-bounces+incoming-imx=patchwork.ozlabs.org@lists.infradead.org;\n\treceiver=)","ozlabs.org; dkim=pass (2048-bit key;\n\tunprotected) header.d=lists.infradead.org\n\theader.i=@lists.infradead.org header.b=\"Mu9VwQf5\"; \n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n\tunprotected) header.d=android.com header.i=@android.com\n\theader.b=\"mjCFBr22\"; dkim-atps=neutral"],"Received":["from bombadil.infradead.org (bombadil.infradead.org\n\t[65.50.211.133])\n\t(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256\n\tbits)) (No client certificate requested)\n\tby ozlabs.org (Postfix) with ESMTPS id 3yRKwt1tVQz9s7G\n\tfor ;\n\tWed, 1 Nov 2017 05:43:10 +1100 (AEDT)","from localhost ([127.0.0.1] helo=bombadil.infradead.org)\n\tby bombadil.infradead.org with esmtp (Exim 4.87 #1 (Red Hat Linux))\n\tid 1e9bVB-00056L-PX; 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