From patchwork Thu Nov 19 14:41:40 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11917763 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=-18.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT 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 4E66CC8301C for ; Thu, 19 Nov 2020 14:43:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 122AE2085B for ; Thu, 19 Nov 2020 14:43:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="VdR4TRQW" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728299AbgKSOmM (ORCPT ); Thu, 19 Nov 2020 09:42:12 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37470 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728292AbgKSOmL (ORCPT ); Thu, 19 Nov 2020 09:42:11 -0500 Received: from mail-wr1-x442.google.com (mail-wr1-x442.google.com [IPv6:2a00:1450:4864:20::442]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8BBE5C061A4D for ; Thu, 19 Nov 2020 06:42:09 -0800 (PST) Received: by mail-wr1-x442.google.com with SMTP id u12so6747731wrt.0 for ; Thu, 19 Nov 2020 06:42:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ffwll.ch; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=rOg+qp39SVj5WC86VkdFnTzL9jP06PEcpQhmqKQ3t14=; b=VdR4TRQWQACxogAeI8bpxISw4lYuZMDpigTJtM/VpnCefzKALSPbEG99bZ5Wbe+gKp gTbBqPkoFOSHKBnAtnkpkRQRBwBUcqVexaUuZzvjGnAeBUC4W8Sgv2HdBZTVCRr0iXOw AVEvBuq1VDgLMzYgPJsacfSZW0w7f2MUd4t1c= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=rOg+qp39SVj5WC86VkdFnTzL9jP06PEcpQhmqKQ3t14=; b=lebxDo2aHLdKCq0Hx+IGHdD99/bv3YPDR/Lxh6/6oBu8XIMAJKjWryc7iDxyc1h/tN M2adzodwcp6Js0CAl6cTda0FboDAOOrB2nDJklOlEXw8MiQTxSgdxhKBGtrzCTKkTrNP ZH9dGL5tyEeMkJcfD+HjtyuV2TorSEBN1y+jlxcgwP/w09gBwP9udSk7oyODsHl8byp3 25WuZXHqm6bLUrObqd3mcnzHqEk591bE6KLqdX7H+tQeDgPAWNDFqkd5aDOrjFohWhMX zrzxDSI59SvOzTkunDNHz7lunwN0JWNcufq5WVos2Nzpsfa9vgQcETJJlQakY6tifPqr V9Kw== X-Gm-Message-State: AOAM5335laI3XPMljhVAQGbjnlwhHSHw0Yii2EfFl+RCW6fC3ZApZqlK gKcgm/EmQWL32SvaINttbTAjvA== X-Google-Smtp-Source: ABdhPJxkxIZb1Dvgqd+l4qpBOUdvHL2JTzWDAAwF5TWOoMRtyTV7FCLmBVro+JG8yHOq0sr6nntY2g== X-Received: by 2002:a05:6000:372:: with SMTP id f18mr11447766wrf.149.1605796928322; Thu, 19 Nov 2020 06:42:08 -0800 (PST) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id x63sm51292wmb.48.2020.11.19.06.42.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 19 Nov 2020 06:42:07 -0800 (PST) From: Daniel Vetter To: DRI Development , LKML Cc: kvm@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-media@vger.kernel.org, Daniel Vetter , Bjorn Helgaas , Daniel Vetter , Jason Gunthorpe , Kees Cook , Dan Williams , Andrew Morton , John Hubbard , =?utf-8?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , linux-pci@vger.kernel.org Subject: [PATCH v6 11/17] PCI: Obey iomem restrictions for procfs mmap Date: Thu, 19 Nov 2020 15:41:40 +0100 Message-Id: <20201119144146.1045202-12-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201119144146.1045202-1-daniel.vetter@ffwll.ch> References: <20201119144146.1045202-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org There's three ways to access PCI BARs from userspace: /dev/mem, sysfs files, and the old proc interface. Two check against iomem_is_exclusive, proc never did. And with CONFIG_IO_STRICT_DEVMEM, this starts to matter, since we don't want random userspace having access to PCI BARs while a driver is loaded and using it. Fix this by adding the same iomem_is_exclusive() check we already have on the sysfs side in pci_mmap_resource(). Acked-by: Bjorn Helgaas References: 90a545e98126 ("restrict /dev/mem to idle io memory ranges") Signed-off-by: Daniel Vetter Cc: Jason Gunthorpe Cc: Kees Cook Cc: Dan Williams Cc: Andrew Morton Cc: John Hubbard Cc: Jérôme Glisse Cc: Jan Kara Cc: Dan Williams Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-samsung-soc@vger.kernel.org Cc: linux-media@vger.kernel.org Cc: Bjorn Helgaas Cc: linux-pci@vger.kernel.org Signed-off-by: Daniel Vetter --- v2: Improve commit message (Bjorn) --- drivers/pci/proc.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c index d35186b01d98..3a2f90beb4cb 100644 --- a/drivers/pci/proc.c +++ b/drivers/pci/proc.c @@ -274,6 +274,11 @@ static int proc_bus_pci_mmap(struct file *file, struct vm_area_struct *vma) else return -EINVAL; } + + if (dev->resource[i].flags & IORESOURCE_MEM && + iomem_is_exclusive(dev->resource[i].start)) + return -EINVAL; + ret = pci_mmap_page_range(dev, i, vma, fpriv->mmap_state, write_combine); if (ret < 0)