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=-1.0 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED autolearn=no 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 608D9C433E0 for ; Wed, 24 Jun 2020 18:42:26 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 28DDB20823 for ; Wed, 24 Jun 2020 18:42:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="bbh8Vk0J" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 28DDB20823 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id B51CA6B002A; Wed, 24 Jun 2020 14:42:25 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B02BF6B002B; Wed, 24 Jun 2020 14:42:25 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A17376B002D; Wed, 24 Jun 2020 14:42:25 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0037.hostedemail.com [216.40.44.37]) by kanga.kvack.org (Postfix) with ESMTP id 8864A6B002A for ; Wed, 24 Jun 2020 14:42:25 -0400 (EDT) Received: from smtpin06.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id 45D9C1EE6 for ; Wed, 24 Jun 2020 18:42:25 +0000 (UTC) X-FDA: 76964975850.06.crook15_130dfa026e46 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin06.hostedemail.com (Postfix) with ESMTP id 1056F1004035F for ; Wed, 24 Jun 2020 18:42:24 +0000 (UTC) X-HE-Tag: crook15_130dfa026e46 X-Filterd-Recvd-Size: 2678 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf32.hostedemail.com (Postfix) with ESMTP for ; Wed, 24 Jun 2020 18:42:24 +0000 (UTC) Received: from X1 (nat-ab2241.sltdut.senawave.net [162.218.216.4]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 5E2C82081A; Wed, 24 Jun 2020 18:42:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1593024143; bh=u4JBs8C6V4svn3BBUSJRfnUdlpVv3TzQ17cAHggPQyo=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=bbh8Vk0J1NwDe1qT04cjnHwjTEsB1bkzIlZe8jYFbuOdDpMMxH3zDnOYpI/GyFq6V zG172rUV1mMn/U2qBeJxHQWlPN4VmEhCg/2Cce4D3U3asE5VHoWJRlCV/reWm70aYv ZwP80rsntfjnvMxxX0HsdHyLAx+02IlWU4jrTABM= Date: Wed, 24 Jun 2020 11:42:22 -0700 From: Andrew Morton To: Catalin Marinas Cc: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, Will Deacon , Dave P Martin , Vincenzo Frascino , Szabolcs Nagy , Kevin Brodsky , Andrey Konovalov , Peter Collingbourne Subject: Re: [PATCH v5 15/25] mm: Allow arm64 mmap(PROT_MTE) on RAM-based files Message-Id: <20200624114222.64b0a50cb0497c5bc524b7d5@linux-foundation.org> In-Reply-To: <20200624175244.25837-16-catalin.marinas@arm.com> References: <20200624175244.25837-1-catalin.marinas@arm.com> <20200624175244.25837-16-catalin.marinas@arm.com> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.32; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 1056F1004035F X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam04 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: On Wed, 24 Jun 2020 18:52:34 +0100 Catalin Marinas wrote: > 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(). > > ... > > --- a/mm/shmem.c > +++ b/mm/shmem.c > @@ -2206,6 +2206,9 @@ static int shmem_mmap(struct file *file, struct vm_area_struct *vma) > vma->vm_flags &= ~(VM_MAYWRITE); > } > > + /* arm64 - allow memory tagging on RAM-based files */ > + vma->vm_flags |= VM_MTE_ALLOWED; > + > file_accessed(file); > vma->vm_ops = &shmem_vm_ops; > if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE) && Acked-by: Andrew Morton