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=-16.6 required=3.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL autolearn=unavailable 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 6BF9CC04AA9 for ; Tue, 30 Apr 2019 13:26:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3799421707 for ; Tue, 30 Apr 2019 13:26:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="G3VBJNj1" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728726AbfD3N0G (ORCPT ); Tue, 30 Apr 2019 09:26:06 -0400 Received: from mail-oi1-f201.google.com ([209.85.167.201]:43480 "EHLO mail-oi1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728649AbfD3N0B (ORCPT ); Tue, 30 Apr 2019 09:26:01 -0400 Received: by mail-oi1-f201.google.com with SMTP id w16so5434787oic.10 for ; Tue, 30 Apr 2019 06:26:01 -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=xNbRPHb0QaxGlTA7s33PjaJCVzzZC2iohEMIfDhjOnw=; b=G3VBJNj1Efd82TURXBcG2ETfYyZa4nNQbw5XcSPgrFNgGTDcrjKi2K3Iqxh9GCJaVT q4ybexiR1zpb+d5J4+ktYX//GzTjjx7hvSHawuAMH2628bR7wRgw71HvGhNfTflHW/zs Atp0zpFkZrhjqB1YK2fIhTRq2d162F4gSLgDXmj1SWW0QKaRzutUGTNf9j2DzCy8DQXs 6qis1IjWlpcydKHrLlqfebzxPQ65WrUm0DNZpeC309u8+WueXbRuj/bbSEKVwswOSRBh 9Q1k1UxCvXqArWAzlxVP1yBw+FzmFzBJan3FvrRViSuycjCJ8f4ZVoJHTVS0bktu9b7r znhA== 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=xNbRPHb0QaxGlTA7s33PjaJCVzzZC2iohEMIfDhjOnw=; b=nS8mQqFxajvNBnHbz+d8cfADH679ORYaxykqeIxOTzxcOwUY0wkaDY2nC2t1SB9qo9 RuU9ofN08xPHIpiXXB1VNZf8V5dJXDNmDuZrwLVUNBT/9OYG0UQtOUHFy1CGE/hO5AoC FLQ12jk4oUId3pk3iH4Tz2xpXjHyHZCVeAkc1RYjDScN+1z5jZB/uQu2wCdBYS/SICyd v16n9R5AFiRg5ij1+6Q9L11GLfi797JK0KzB1yhmX6soWU2QL9FSv3JCcnn75VHPCJV3 BVub9KzfSyTxnnQW6c0r8G24OXN3pPv6Eo5EQAZSo41qpFqAoWO9t1QCMcvOTsd5RNzg nF6g== X-Gm-Message-State: APjAAAW+PpIg5w8xMDV2l/iIKn5SY7pQCbhL8FVIRm721l00fuPDCUHP wpOUobxql4gngbPg+Im2ooVW0N11KH4KLnmI X-Google-Smtp-Source: APXvYqzqz0hM8566mMMykEcEDE15qguKaKv3Gnp85A2T0WJw46tHTZ3v4v+uUTcgMqiUvlhCC6+9Qaw/183DYgvX X-Received: by 2002:a05:6808:4ca:: with SMTP id a10mr3005375oie.35.1556630760913; Tue, 30 Apr 2019 06:26:00 -0700 (PDT) Date: Tue, 30 Apr 2019 15:25:10 +0200 In-Reply-To: Message-Id: <66262e91c1768bf61e78456608a8a5190ea4e1d8.1556630205.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.21.0.593.g511ec345e18-goog Subject: [PATCH v14 14/17] media/v4l2-core, arm64: untag user pointers in videobuf_dma_contig_user_get 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 Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. videobuf_dma_contig_user_get() uses provided user pointers for vma lookups, which can only by done with untagged pointers. Untag the pointers in this function. Signed-off-by: Andrey Konovalov --- drivers/media/v4l2-core/videobuf-dma-contig.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/media/v4l2-core/videobuf-dma-contig.c b/drivers/media/v4l2-core/videobuf-dma-contig.c index e1bf50df4c70..8a1ddd146b17 100644 --- a/drivers/media/v4l2-core/videobuf-dma-contig.c +++ b/drivers/media/v4l2-core/videobuf-dma-contig.c @@ -160,6 +160,7 @@ static void videobuf_dma_contig_user_put(struct videobuf_dma_contig_memory *mem) static int videobuf_dma_contig_user_get(struct videobuf_dma_contig_memory *mem, struct videobuf_buffer *vb) { + unsigned long untagged_baddr = untagged_addr(vb->baddr); struct mm_struct *mm = current->mm; struct vm_area_struct *vma; unsigned long prev_pfn, this_pfn; @@ -167,22 +168,22 @@ static int videobuf_dma_contig_user_get(struct videobuf_dma_contig_memory *mem, unsigned int offset; int ret; - offset = vb->baddr & ~PAGE_MASK; + offset = untagged_baddr & ~PAGE_MASK; mem->size = PAGE_ALIGN(vb->size + offset); ret = -EINVAL; down_read(&mm->mmap_sem); - vma = find_vma(mm, vb->baddr); + vma = find_vma(mm, untagged_baddr); if (!vma) goto out_up; - if ((vb->baddr + mem->size) > vma->vm_end) + if ((untagged_baddr + mem->size) > vma->vm_end) goto out_up; pages_done = 0; prev_pfn = 0; /* kill warning */ - user_address = vb->baddr; + user_address = untagged_baddr; while (pages_done < (mem->size >> PAGE_SHIFT)) { ret = follow_pfn(vma, user_address, &this_pfn); -- 2.21.0.593.g511ec345e18-goog