From patchwork Wed Mar 20 14:51:22 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 10862025 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E3EA913B5 for ; Wed, 20 Mar 2019 14:54:48 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id CAAB028B9C for ; Wed, 20 Mar 2019 14:54:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id C801C2981F; Wed, 20 Mar 2019 14:54:48 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.5 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI, USER_IN_DEF_DKIM_WL autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7034129A00 for ; Wed, 20 Mar 2019 14:54:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728467AbfCTOwK (ORCPT ); Wed, 20 Mar 2019 10:52:10 -0400 Received: from mail-yw1-f74.google.com ([209.85.161.74]:51568 "EHLO mail-yw1-f74.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728471AbfCTOwK (ORCPT ); Wed, 20 Mar 2019 10:52:10 -0400 Received: by mail-yw1-f74.google.com with SMTP id s11so3361691ywa.18 for ; Wed, 20 Mar 2019 07:52:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:in-reply-to:message-id:mime-version:references:subject:from:to :cc; bh=MRHHZYm6qbbddi64ikktRuAjn8BoXK8Gf7bv/2tC2r0=; b=KRMkdxMD5r/ER0b2EYOaeTinlF21JbEs5hD7NF/4KuqBnnQC7/Ye6Qw9DCv6nYaIx6 4U2cUzqhytwW3z5B4iRPFCCYHJA/xIASnuuJbgU+DFTxxvtbMCxk2YOQuO+k3FhjQZxT +HNaP52fISwxZzgGzVRKuYbp7Q8oH3K6BetnL7BXKag5ZZAYsbr0n35Pp3LUj50J49dx O5jbTLSzQ9if52c7p/5fn1S3OpB1gYH1iUyL2wrB6P1nRrgD/9GDVY3gp4qdOHpbJY1p i3H4A9ArVAT2nkBdJ2JerrQkq4TGT69QXIEYb6sDErAg40bUbxmWd7KaeWagNV837y9+ Oy3A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=MRHHZYm6qbbddi64ikktRuAjn8BoXK8Gf7bv/2tC2r0=; b=j3wY0B8a44oA3JlII0xtVLFi1kPspSljxRqeoppE/HkjKIPFpq7VY+8bOVlCJGEPBF 8bMuCO55OgRASF3IhIMCJPO4yMypNHRBzjmsPdg11QQgwecJVd8gobDMMwnvoRzpgZss L4RSLBDES3Aw7Wf8uPQJACzP+HF+deIL38EAAAeT3YIu3A9bwhkF7T2wocrNT25cnURQ WIGQ9WU0YXOrzm0J5WEh7xLnlZDc8xciAZwOOqFNND40YsaJ0vqrBwbXo1bNY7uXhyf0 dKIyFWXSg+8pLdd7yEP1Xp9gIWBKaDcrwCJqMHosWHLxEMJiMuhM7s57pXDMJCHLLYTx NtSg== X-Gm-Message-State: APjAAAVLPVZK4jO/SwJEVpCwCcNjNlSeQl647xY4wNChpSHGoHp32/Ie zSHfid1LXI4Q4qPRghaHMiR8/qQpEZLFB5Gx X-Google-Smtp-Source: APXvYqwr9m8YxgeUDBeeozt2hDgx245cPvqj3jehL0crcqpJn0rfr3qEPeO8cHwuraZTKRyiRzSC54VlM7fEpP7b X-Received: by 2002:a81:7acf:: with SMTP id v198mr2201203ywc.16.1553093528977; Wed, 20 Mar 2019 07:52:08 -0700 (PDT) Date: Wed, 20 Mar 2019 15:51:22 +0100 In-Reply-To: Message-Id: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.21.0.225.g810b269d1ac-goog Subject: [PATCH v13 08/20] fs, arm64: untag user pointers in fs/userfaultfd.c From: Andrey Konovalov To: Catalin Marinas , Will Deacon , Mark Rutland , Robin Murphy , Kees Cook , Kate Stewart , Greg Kroah-Hartman , Andrew Morton , Ingo Molnar , "Kirill A . Shutemov" , Shuah Khan , Vincenzo Frascino , Eric Dumazet , "David S. Miller" , Alexei Starovoitov , Daniel Borkmann , Steven Rostedt , Ingo Molnar , Peter Zijlstra , Arnaldo Carvalho de Melo , Alex Deucher , " =?utf-8?q?Christian_K=C3=B6nig?= " , "David (ChunMing) Zhou" , Yishai Hadas , Mauro Carvalho Chehab , Jens Wiklander , Alex Williamson , linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, kvm@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Chintan Pandya , Luc Van Oostenryck , Dave Martin , Kevin Brodsky , Szabolcs Nagy , Andrey Konovalov Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This patch is a part of a series that extends arm64 kernel ABI to allow to pass tagged user pointers (with the top byte set to something else other than 0x00) as syscall arguments. userfaultfd_register() and userfaultfd_unregister() use provided user pointers for vma lookups, which can only by done with untagged pointers. Untag user pointers in these functions. Signed-off-by: Andrey Konovalov --- fs/userfaultfd.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c index 89800fc7dc9d..a3b70e0d9756 100644 --- a/fs/userfaultfd.c +++ b/fs/userfaultfd.c @@ -1320,6 +1320,9 @@ static int userfaultfd_register(struct userfaultfd_ctx *ctx, goto out; } + uffdio_register.range.start = + untagged_addr(uffdio_register.range.start); + ret = validate_range(mm, uffdio_register.range.start, uffdio_register.range.len); if (ret) @@ -1507,6 +1510,8 @@ static int userfaultfd_unregister(struct userfaultfd_ctx *ctx, if (copy_from_user(&uffdio_unregister, buf, sizeof(uffdio_unregister))) goto out; + uffdio_unregister.start = untagged_addr(uffdio_unregister.start); + ret = validate_range(mm, uffdio_unregister.start, uffdio_unregister.len); if (ret)