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 X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7711CC4BA1E for ; Wed, 26 Feb 2020 18:06:17 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 404F620732 for ; Wed, 26 Feb 2020 18:06:17 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 404F620732 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id B07816B008A; Wed, 26 Feb 2020 13:06:02 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 9CDDB6B008C; Wed, 26 Feb 2020 13:06:02 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 840336B0092; Wed, 26 Feb 2020 13:06:02 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0183.hostedemail.com [216.40.44.183]) by kanga.kvack.org (Postfix) with ESMTP id 654216B008A for ; Wed, 26 Feb 2020 13:06:02 -0500 (EST) Received: from smtpin11.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 379EC246E for ; Wed, 26 Feb 2020 18:06:02 +0000 (UTC) X-FDA: 76533056964.11.cord17_34ad34e2e1d57 X-HE-Tag: cord17_34ad34e2e1d57 X-Filterd-Recvd-Size: 2250 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf28.hostedemail.com (Postfix) with ESMTP for ; Wed, 26 Feb 2020 18:06:01 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 6F4E04B2; Wed, 26 Feb 2020 10:06:01 -0800 (PST) Received: from arrakis.cambridge.arm.com (usa-sjc-imap-foss1.foss.arm.com [10.121.207.14]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id F18A83F881; Wed, 26 Feb 2020 10:05:59 -0800 (PST) From: Catalin Marinas To: linux-arm-kernel@lists.infradead.org Cc: Will Deacon , Vincenzo Frascino , Szabolcs Nagy , Richard Earnshaw , Kevin Brodsky , Andrey Konovalov , Peter Collingbourne , linux-mm@kvack.org, linux-arch@vger.kernel.org Subject: [PATCH v2 15/19] mm: Allow arm64 mmap(PROT_MTE) on RAM-based files Date: Wed, 26 Feb 2020 18:05:22 +0000 Message-Id: <20200226180526.3272848-16-catalin.marinas@arm.com> X-Mailer: git-send-email 2.25.0 In-Reply-To: <20200226180526.3272848-1-catalin.marinas@arm.com> References: <20200226180526.3272848-1-catalin.marinas@arm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Since arm64 memory (allocation) tags can only be stored in RAM, mapping files with PROT_MTE is not allowed by default. RAM-based files like those in a tmpfs mount or memfd_create() can support memory tagging, so update the vm_flags accordingly in shmem_mmap(). Signed-off-by: Catalin Marinas --- mm/shmem.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/shmem.c b/mm/shmem.c index c8f7540ef048..afd050ac7f8d 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -2226,6 +2226,9 @@ static int shmem_mmap(struct file *file, struct vm_= area_struct *vma) vma->vm_flags &=3D ~(VM_MAYWRITE); } =20 + /* arm64 - allow memory tagging on RAM-based files */ + vma->vm_flags |=3D VM_MTE_ALLOWED; + file_accessed(file); vma->vm_ops =3D &shmem_vm_ops; if (IS_ENABLED(CONFIG_TRANSPARENT_HUGE_PAGECACHE) &&