From patchwork Mon Jun 3 16:55:15 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrey Konovalov X-Patchwork-Id: 10973321 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 CC4EF6C5 for ; Mon, 3 Jun 2019 16:56:11 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id B958B28684 for ; Mon, 3 Jun 2019 16:56:11 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id AB97A2873C; Mon, 3 Jun 2019 16:56:11 +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 4899828684 for ; Mon, 3 Jun 2019 16:56:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729697AbfFCQ4J (ORCPT ); Mon, 3 Jun 2019 12:56:09 -0400 Received: from mail-vk1-f201.google.com ([209.85.221.201]:35693 "EHLO mail-vk1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729686AbfFCQ4H (ORCPT ); Mon, 3 Jun 2019 12:56:07 -0400 Received: by mail-vk1-f201.google.com with SMTP id q13so4520807vke.2 for ; Mon, 03 Jun 2019 09:56:07 -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=Y8tRh8UuVncP1ncRA8ZfIPgOhX9+nAfsBu2vnbYNOEE=; b=eFK1jtlEFrS3m2V50O3J5bSuSe+f8SF2oOEJcYGOiFDh2Xi4MGaW9nDUncCGVcGUyN tYL5ptbIsLBKOxSfh5JEibNl8mgQflxa8qzQZCZGbKOMu+ue4btTZbmvk6Kxh+WcG+Wv fn/kF4y9wQfMzaBiS9+LkicOpt8tKnLL/K7iTnBUbTxgKs5dHlS/ncUSuv8GobYsG6Cu 6qM+L38/9FABz5BxD3BPgItX9XL5QdXg0jsVIbHzcM5qVU0wJRygy73ep5mkhIvjeckb fTT0sIEfasP+T2Y6+uUP2P0imGCc2+QNF2QVC0kVT6BdFDtQ0zPTYlADXVtguKUh5EC4 AB9A== 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=Y8tRh8UuVncP1ncRA8ZfIPgOhX9+nAfsBu2vnbYNOEE=; b=IKsYIRdZ0QHlFyHBXN+kL+5pzswhv+cRfh4kLXUiqth+0U4Evc8CZ5PhjfVF8Q2bdI W3z16Z0yDO+z8b3U5hggjIYpkcFcRi4nJ5t7dl0gwxdG7f85m2GtGOoXwMFknDo2Jwr/ OTwB6yTgFOG8lOR+jEJvyLMUOm5G9bN+jP4Yzpt01WVaMgzU2ieC+UrGAGJ+MpZ3x1V6 TsC6cI0MqkoZ/vLxDRuletZgszrLS9nThm856fDYRGSyIaBomJRFb8JeysPXlPXYMXyn Kj2nlJAgbWNz2M/pMIBWqMIPliSPqyM2rZar2EgCwl9fcQtSv7osTgtJ2zhEVqIBl+vZ 5hFA== X-Gm-Message-State: APjAAAUuJyJA6tOF9fv1R2Ins6wsiarDvEznZyWcdFoGZNuMuTgMxUM+ 18DauwVWoxcBlvrAv+Nqp+pLuBchw0LNgNEU X-Google-Smtp-Source: APXvYqzz/ntPC10OZ0frdLABrSNi7hvZ/ytx4Ex3aaENCq428cafLYJMM+5BmbKZZkSR6QrCbMGhJA3iBNJvNJC5 X-Received: by 2002:a9f:25c6:: with SMTP id 64mr157298uaf.36.1559580966349; Mon, 03 Jun 2019 09:56:06 -0700 (PDT) Date: Mon, 3 Jun 2019 18:55:15 +0200 In-Reply-To: Message-Id: <31821f3538ddacb7e57e0248e86a3d28f9789d2f.1559580831.git.andreyknvl@google.com> Mime-Version: 1.0 References: X-Mailer: git-send-email 2.22.0.rc1.311.g5d7573a151-goog Subject: [PATCH v16 13/16] 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 , 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 , Mauro Carvalho Chehab Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@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. Acked-by: Mauro Carvalho Chehab Signed-off-by: Andrey Konovalov Reviewed-by: Kees Cook --- 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);