From patchwork Tue Apr 30 13:25:10 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 10923511 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 4046C933 for ; Tue, 30 Apr 2019 13:26:06 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2F1CD27EE2 for ; Tue, 30 Apr 2019 13:26:06 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 22FF328A63; Tue, 30 Apr 2019 13:26:06 +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 B45BF27EE2 for ; Tue, 30 Apr 2019 13:26:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728671AbfD3N0E (ORCPT ); Tue, 30 Apr 2019 09:26:04 -0400 Received: from mail-oi1-f201.google.com ([209.85.167.201]:54687 "EHLO mail-oi1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728647AbfD3N0B (ORCPT ); Tue, 30 Apr 2019 09:26:01 -0400 Received: by mail-oi1-f201.google.com with SMTP id f21so2252629oib.21 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=Vck8DgoTBbqVwrFJsrzr97Ig/UvXn+/TW8UdNzVvTTRl6IU8QKuBFfrVMAddzdxVvj bnh/j7VeFAA4MxCWf75eraHpZERnQxFNocwUDPBmTZY3iWUqNlz3HG8WCOBwJs4bX2o2 uKrXrSDEmhppg3mcuNQz4fgyXzW2zYIVjrZmiG6xeuqiI58yGGYVCGAi3SleUkXS+qAW BzOK/9fF255l4YuhBancZGKGieA0b+4NIVL01m4i9Iz5QteVxHcPGJZplqKvnAogn3kK aBHshnZH/+djw4bR10IQRqLwy/4ECHEecuuHE8la6HPkEJdU7zdwnfGb7lk5aii12Ulc u5dA== X-Gm-Message-State: APjAAAUCb3kSuWkVp+LbV7Y1CY4dELLtah+ouiN+OdbE0D+i06VGWBnC ozZWaxlFz+eRmq2RSRrD6lyKUkjY4CI4wNjD 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 Sender: linux-kselftest-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@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. 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);