From patchwork Tue Apr 30 13:25:12 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 10923523 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 AF0A6933 for ; Tue, 30 Apr 2019 13:26:13 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 9FB1827EE2 for ; Tue, 30 Apr 2019 13:26:13 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 937762860A; Tue, 30 Apr 2019 13:26:13 +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 4423F27EE2 for ; Tue, 30 Apr 2019 13:26:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728735AbfD3N0J (ORCPT ); Tue, 30 Apr 2019 09:26:09 -0400 Received: from mail-pg1-f201.google.com ([209.85.215.201]:51454 "EHLO mail-pg1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728736AbfD3N0I (ORCPT ); Tue, 30 Apr 2019 09:26:08 -0400 Received: by mail-pg1-f201.google.com with SMTP id 63so1924759pga.18 for ; Tue, 30 Apr 2019 06:26:08 -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=Qo5FEqXeJKdpmXvqV1aNmsvS1qf4QOcuAEvGRZnbU+I=; b=WJvgA7FhPH4nnlwUD7/cK+UGsQvztnpEwl/EwgwpETKSn2jcm2n8vXAJ5vmz+updJQ hv5vQG7S1TSnGIvsNFWmNlDJOuMgBbHPDTDqE1/Q7BSkSWZGsQSxWFmbI9EyZ11RD35O PoWicUER0x2L/roTgi03inDjhawM/RefWqQ0HU9dp3Bfb6piRBIYbrmvMjy86XgTN3si Ctsvudz1bGthwFBvr6qlHQElPSiMTUZTlDJzHWjXIK5Av3TkDr+6XQPdcLfX/oczYas3 y01MzwmNMMd59RGZLYJMIFoZY0gr9B1FAyRfwBPJvm7Zd8dDqsp5xcnwSnBCo7S+GHIh eAtA== 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=Qo5FEqXeJKdpmXvqV1aNmsvS1qf4QOcuAEvGRZnbU+I=; b=aWu4wS+zNSHhdQtiKnZzxLJb+xBfhOb39Z5iHa0hg6VBJzlQB1gi8tUB0lMWP05dZg 1oBT5ohfrUA9xHNWVR3wP8JzgJfINNV1HgJAliOdRKbK1LF8kVkn51sdUVqzwLbpBd86 EOqxwhCbTfmbeKs8+OG+9nQN4QFCdDucLDp96jIT/neX9Y9AoOl/uu6ug817rbO9J5pT Jo/Vs+E2Tp7F0w6SB5OxzLSMZaBkwKK2h2krm47UWD6DBdg30LTxBtB7H0Etu7XQKMju X+ydQsK7nWCjE6+AFYq8tNWwa6fTr2Dxg05YDghVxiXTwRUIg/85NkFaUIODlsT+2T36 KiQA== X-Gm-Message-State: APjAAAUKds7Wti6u+yJQE/pEZjriDNJ7wFowDmzaWDhMKVMBlhADx5iQ tY2E/pDVrV84u0qbtb0lb6Tlidrya4cMHKzz X-Google-Smtp-Source: APXvYqzC1lVWU3xOxPIpeGY1IySKfn9D9N99TINTSZcSwcwIPCbrd75tIMQec4oX3DSqqzuBnQc6miaAqMAhwGUH X-Received: by 2002:a63:1d4f:: with SMTP id d15mr64183239pgm.347.1556630767405; Tue, 30 Apr 2019 06:26:07 -0700 (PDT) Date: Tue, 30 Apr 2019 15:25:12 +0200 In-Reply-To: Message-Id: Mime-Version: 1.0 References: X-Mailer: git-send-email 2.21.0.593.g511ec345e18-goog Subject: [PATCH v14 16/17] vfio/type1, arm64: untag user pointers in vaddr_get_pfn 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 , Kuehling@google.com, Felix , Deucher@google.com, Alexander , Koenig@google.com, Christian , Mauro Carvalho Chehab , Jens Wiklander , Alex Williamson , Leon Romanovsky , Dmitry Vyukov , Kostya Serebryany , Evgeniy Stepanov , Lee Smith , Ramana Radhakrishnan , Jacob Bramley , Ruben Ayrapetyan , Robin Murphy , 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. vaddr_get_pfn() uses provided user pointers for vma lookups, which can only by done with untagged pointers. Untag user pointers in this function. Signed-off-by: Andrey Konovalov --- drivers/vfio/vfio_iommu_type1.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index d0f731c9920a..5daa966d799e 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -382,6 +382,8 @@ static int vaddr_get_pfn(struct mm_struct *mm, unsigned long vaddr, down_read(&mm->mmap_sem); + vaddr = untagged_addr(vaddr); + vma = find_vma_intersection(mm, vaddr, vaddr + 1); if (vma && vma->vm_flags & VM_PFNMAP) {