From patchwork Mon Jun 24 14:32:51 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 11013447 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 02BBC1580 for ; Mon, 24 Jun 2019 14:34:42 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E93D028BFC for ; Mon, 24 Jun 2019 14:34:41 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D568228BFA; Mon, 24 Jun 2019 14:34:41 +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 6CF1A28BFA for ; Mon, 24 Jun 2019 14:34:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729236AbfFXOd1 (ORCPT ); Mon, 24 Jun 2019 10:33:27 -0400 Received: from mail-vk1-f201.google.com ([209.85.221.201]:52011 "EHLO mail-vk1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729184AbfFXOdY (ORCPT ); Mon, 24 Jun 2019 10:33:24 -0400 Received: by mail-vk1-f201.google.com with SMTP id s145so6439143vke.18 for ; Mon, 24 Jun 2019 07:33:23 -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=6wOlIN9RCqtC4EMjbsO9NIyMZhz6XW377zGYJAhhjSw=; b=EdyxEJFnWG9rQS7GXNgeJyNTxEu5LtqPTYYbN/QLe+5zlbDexboGyDqBC815Hrokjj qfAzqSeaTKPFvVv9WWYIndqnAPiRljjB3TIDjGP/0IMssQbdVP4BzrpsfzCXDKI9BDHt WeSswvJDxczfbCTt3IQqYPH1jX0VOQ5O+GZOEn825FLst0HqKs8RjnFS0DrDqqOlKlcm +N5mzxkUilj5uw0wDqYjDhK1/db8t8dLQzbwnNuEhal4y8tjJfxP9svgAu0LB4ORTyVD OZMU426HgS0vYo8hjqCwVk8ERda/jHZQ5JXLr2v38JKqFFajbtzb+/rl5BB+KXJN5rjD 80IA== 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=6wOlIN9RCqtC4EMjbsO9NIyMZhz6XW377zGYJAhhjSw=; b=KrOSj0CxQduq3fM1jcQDs0NHYbIOyPM7dicV2ONGCx92pD9fBH9XXBSOZ/3YgC8I6L EQscdkELlZpm45CbSRvpT+mmC2ktc7qvDXR4xi1YRizt4GR1TIG642nqZgzynbSm19WD P9i0DOd/80E7+Vs7KpqzrjXtNiNqWpfmZygP0ds0CCmk1Dp1acXFTEk63D7vFf+VUlZq dOgptzMyv5SeymzJBPAoWWxE7qlTbgLB2GA5oYjxgBbu3he7HbGWVAw4XiwPJWqvPWzs hbDwaFhDPtkf9FLK9ZgZs9GPxP7dGGIhJLQiCkpPTkur2Ky2rcFCvNVgAUy/w4Nu7YK7 khfQ== X-Gm-Message-State: APjAAAVnU1JNqhnygIGZxQRXfJwQWzGRKDbEb1f3Voi0KsM3ng+PlpOF bRRyaWUSMwW3L0ZhhbUFMkWrzz7O5X2AdMUo X-Google-Smtp-Source: APXvYqypfx2HThdGezp/oUedjYKv44Fb8n5lNK45oyS/vOtxc58Rwt4c9Y+yK17e0xs6J7fV+AYN9l/kG2KmENab X-Received: by 2002:ab0:5c8:: with SMTP id e66mr54849002uae.10.1561386803022; Mon, 24 Jun 2019 07:33:23 -0700 (PDT) Date: Mon, 24 Jun 2019 16:32:51 +0200 In-Reply-To: Message-Id: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.22.0.410.gd8fdbe21b5-goog Subject: [PATCH v18 06/15] mm: untag user pointers in get_vaddr_frames From: Andrey Konovalov To: linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@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 Cc: Catalin Marinas , Vincenzo Frascino , Will Deacon , Mark Rutland , Andrew Morton , Greg Kroah-Hartman , Kees Cook , Yishai Hadas , Felix Kuehling , Alexander Deucher , Christian Koenig , Mauro Carvalho Chehab , Jens Wiklander , Alex Williamson , Leon Romanovsky , Luc Van Oostenryck , Dave Martin , Khalid Aziz , enh , Jason Gunthorpe , Christoph Hellwig , Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Robin Murphy , 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 kernel ABI to allow to pass tagged user pointers (with the top byte set to something else other than 0x00) as syscall arguments. get_vaddr_frames uses provided user pointers for vma lookups, which can only by done with untagged pointers. Instead of locating and changing all callers of this function, perform untagging in it. Reviewed-by: Khalid Aziz Reviewed-by: Vincenzo Frascino Acked-by: Catalin Marinas Reviewed-by: Kees Cook Signed-off-by: Andrey Konovalov --- mm/frame_vector.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/frame_vector.c b/mm/frame_vector.c index c64dca6e27c2..c431ca81dad5 100644 --- a/mm/frame_vector.c +++ b/mm/frame_vector.c @@ -46,6 +46,8 @@ int get_vaddr_frames(unsigned long start, unsigned int nr_frames, if (WARN_ON_ONCE(nr_frames > vec->nr_allocated)) nr_frames = vec->nr_allocated; + start = untagged_addr(start); + down_read(&mm->mmap_sem); locked = 1; vma = find_vma_intersection(mm, start, start + 1);