From patchwork Wed Mar 20 14:51:20 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 10862039 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 20E7313B5 for ; Wed, 20 Mar 2019 14:55:03 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 01B5129DAE for ; Wed, 20 Mar 2019 14:55:03 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F2C2B29DBD; Wed, 20 Mar 2019 14:55:02 +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 841AD29DA5 for ; Wed, 20 Mar 2019 14:55:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728620AbfCTOy6 (ORCPT ); Wed, 20 Mar 2019 10:54:58 -0400 Received: from mail-ua1-f73.google.com ([209.85.222.73]:49934 "EHLO mail-ua1-f73.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728446AbfCTOwD (ORCPT ); Wed, 20 Mar 2019 10:52:03 -0400 Received: by mail-ua1-f73.google.com with SMTP id y1so215184uaq.16 for ; Wed, 20 Mar 2019 07:52:03 -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=o/tjHBN+YdVOHlZBhUHSY9iDnhLS0V50uWJeHP43be4=; b=A+JYGhZ3fQkhscb6lUBmQ1muz6oemHopDmPki/B278rzjZ0dk/UjohSsOxEu8keiCi W5/VXLZ67gUh0RZN3rq5skpPYsUC7oWDq+tl+3khHwdNxCrmhkhxq7w99dcsLgc3Elx7 dmeBy427vSPfFNaJS7DfUhAb/Fwd/EACn2TYRVMksoGnObzxZTWUPnBuSuAiS/JRvPZA f0EsOCj85jPSuENzq/Bg7zakYTOA4bo6fX1BKjPllZeRcF3GtXBJjjiVIF4U6HkOW9id X49/giQrlJvYsmuoQtVxMGCVLZT2pR3apmEVULZaKks3LsI2Ip7Pr6oRl+H4swKOnmZR D5tA== 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=o/tjHBN+YdVOHlZBhUHSY9iDnhLS0V50uWJeHP43be4=; b=YYXnqOz2cuphcwKYnh1iXDIcN91rOECUcWJqPRqmjANfCxfRZ4Lz1ujKS2Qa0OUFUa DIb+86eiRGJmPyEvFtC7KA4RaKuwLLdkepkHXGVyzGVz4si5wxM+2ajX5CaYpgdxtT5B NxycbNSCw2kYeDlUwQkE86BPgwIjd7VGGXu6qOUmF7nmwy0OJBjCHM0gj/DWbQFXzc+/ YN0OiedjhrmpQfRjBPGlPf3Lmvm+Z9PBZZrsfEiEdZEmjKIngiwiOvd0QdyTDBkkO9fd NTWe3bujnDyRPWI+3JX2CBrjcIqCV895lWRvrYr4SaCKG0Ltb4D9Znw5DR/utpQjsu94 H6fA== X-Gm-Message-State: APjAAAUPqQ0HSHKLd2rCPH4T8S1g9XRBtxGbyw5qUk6Mtlnf5PJwDNeD BZOMyEg1LBuES8xkoLJfW0LIhBWKFfJO4bAJ X-Google-Smtp-Source: APXvYqyHOngs34In5uhQcXPzOfQqpf0ARHPrNyLHXpzz5ogONfScZvSMOj1YE9ihREsOQQ2kQeo8TqNX7xzilecW X-Received: by 2002:a67:7651:: with SMTP id r78mr6363022vsc.39.1553093522664; Wed, 20 Mar 2019 07:52:02 -0700 (PDT) Date: Wed, 20 Mar 2019 15:51:20 +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 06/20] mm, arm64: untag user pointers in get_vaddr_frames 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-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@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. 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. 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);