From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 4C9A4C4332F for ; Fri, 10 Nov 2023 14:50:43 +0000 (UTC) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=N3RzrTPU; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4SRhZn5587z3cTS for ; Sat, 11 Nov 2023 01:50:41 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256 header.s=pp1 header.b=N3RzrTPU; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux.ibm.com (client-ip=148.163.156.1; helo=mx0a-001b2d01.pphosted.com; envelope-from=aneesh.kumar@linux.ibm.com; receiver=lists.ozlabs.org) Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4SRhYn6Q81z3cG6 for ; Sat, 11 Nov 2023 01:49:49 +1100 (AEDT) Received: from pps.filterd (m0353729.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 3AAEgeHR023896; Fri, 10 Nov 2023 14:49:33 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : mime-version : content-type; s=pp1; bh=8EgQILAIzxCVrDZs6HD2DIpTAOE0C30qR5bidQWM848=; b=N3RzrTPUy0oDABHEdtVrwu/vaiSttxBKTbW9ypBQRSGpih6Y06EaR2t7JEAUyAuUU+ix CJolZrp5w38F4nAfi3L1ZrCk383Wf7jQbByn36luegBz2T5TtY7PgdSNGjs169Cb+h9G dsHou35QoERRG7/45IvmchhKw9OiYJdn44eBnXduWmSLz+S5c+htsKJlnhxrHKZTgNSa tYHB2gkDgEAKmypr57y/jRTpBXWKKAx2L0QIz0UtUngrogv+iXEBZ5gb5hWl/CNHQUb7 6wWRCEtUiT5Nejj+zN3tlYC081NaxISv/5HjkMRdWeiP7i9Iu+AC2mxZWuycyYOP+/z0 4Q== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3u9ph3r6cq-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 10 Nov 2023 14:49:33 +0000 Received: from m0353729.ppops.net (m0353729.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 3AAEhI8J029268; Fri, 10 Nov 2023 14:49:32 GMT Received: from ppma13.dal12v.mail.ibm.com (dd.9e.1632.ip4.static.sl-reverse.com [50.22.158.221]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3u9ph3r6c3-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 10 Nov 2023 14:49:32 +0000 Received: from pps.filterd (ppma13.dal12v.mail.ibm.com [127.0.0.1]) by ppma13.dal12v.mail.ibm.com (8.17.1.19/8.17.1.19) with ESMTP id 3AAE0uEi003431; Fri, 10 Nov 2023 14:49:31 GMT Received: from smtprelay07.wdc07v.mail.ibm.com ([172.16.1.74]) by ppma13.dal12v.mail.ibm.com (PPS) with ESMTPS id 3u7w22bfx8-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 10 Nov 2023 14:49:31 +0000 Received: from smtpav02.dal12v.mail.ibm.com (smtpav02.dal12v.mail.ibm.com [10.241.53.101]) by smtprelay07.wdc07v.mail.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 3AAEnUFf6554222 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 10 Nov 2023 14:49:31 GMT Received: from smtpav02.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 929F558051; Fri, 10 Nov 2023 14:49:30 +0000 (GMT) Received: from smtpav02.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id EDE105805A; Fri, 10 Nov 2023 14:49:27 +0000 (GMT) Received: from skywalker.linux.ibm.com (unknown [9.43.3.89]) by smtpav02.dal12v.mail.ibm.com (Postfix) with ESMTP; Fri, 10 Nov 2023 14:49:27 +0000 (GMT) X-Mailer: emacs 29.1 (via feedmail 11-beta-1 I) From: "Aneesh Kumar K.V" To: Catalin Marinas , Jason Gunthorpe , David Hildenbrand , akpm@linux-foundation.org, Christophe Leroy Subject: get_user_pages() and EXEC_ONLY mapping. Date: Fri, 10 Nov 2023 20:19:23 +0530 Message-ID: <87bkc1oe8c.fsf@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain X-TM-AS-GCONF: 00 X-Proofpoint-GUID: h6iFfAsG-ZU_npkoCH6EsMix9gfG4l19 X-Proofpoint-ORIG-GUID: Wsorie0BiqKyNeoiLVGcjmznJSoa1yB7 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.272,Aquarius:18.0.987,Hydra:6.0.619,FMLib:17.11.176.26 definitions=2023-11-10_12,2023-11-09_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=299 suspectscore=0 adultscore=0 priorityscore=1501 phishscore=0 clxscore=1011 mlxscore=0 malwarescore=0 impostorscore=0 spamscore=0 lowpriorityscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2311060000 definitions=main-2311100122 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Hello, Some architectures can now support EXEC_ONLY mappings and I am wondering what get_user_pages() on those addresses should return. Earlier PROT_EXEC implied PROT_READ and pte_access_permitted() returned true for that. But arm64 does have this explicit comment that says /* * p??_access_permitted() is true for valid user mappings (PTE_USER * bit set, subject to the write permission check). For execute-only * mappings, like PROT_EXEC with EPAN (both PTE_USER and PTE_UXN bits * not set) must return false. PROT_NONE mappings do not have the * PTE_VALID bit set. */ Is that correct? We should be able to get struct page for PROT_EXEC mappings? -aneesh