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=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 2E2C5C56204 for ; Wed, 21 Oct 2020 08:58:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B122E2244C for ; Wed, 21 Oct 2020 08:58:13 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="GUK8bAu/" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2502370AbgJUI6K (ORCPT ); Wed, 21 Oct 2020 04:58:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41444 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2502371AbgJUI5W (ORCPT ); Wed, 21 Oct 2020 04:57:22 -0400 Received: from mail-wr1-x443.google.com (mail-wr1-x443.google.com [IPv6:2a00:1450:4864:20::443]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4568CC0613D8 for ; Wed, 21 Oct 2020 01:57:21 -0700 (PDT) Received: by mail-wr1-x443.google.com with SMTP id n18so2110369wrs.5 for ; Wed, 21 Oct 2020 01:57:21 -0700 (PDT) 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=7XJE+hSH/S5sf+J2AcmYCFMIcTxnQzpOZqEdbmMuzFE=; b=GUK8bAu/rOwhstjfCCL4jyz79EWKlxKCEPzbQk67yqQgL5JdMMK9qYFAwYpDisTw7I i418204vlPkRGtUhsDK0/5TGt4bPzoR91GVgS9OWMA2nj4HmDeVE9XWPk7FPp7l7XoFa ZYmkpZjMTP6Ea3nY9tfKU2e09YncWgauHxbSA= 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=7XJE+hSH/S5sf+J2AcmYCFMIcTxnQzpOZqEdbmMuzFE=; b=B38Alc4ezHQFxr7V/PwGnX2d1CPg4IEWBAGh6Z6tH4GdGOMaQiCnQfcl0GxKuUkQR6 WANz7Ghig8KNIN525SJ8jCXQysNp4PYIwy/xBACD99rBsNWtclphHuXl6EPBuaOJ5brw fi40dhkxpEvPe6KJRraEEm8Lm3iGShJuUQuOmT3Xhq8ZqVtYf8Hx3zJFkb6IWxzl+X+E CxtRbLH4SdvHL2egv1x3YRP3coU4SvV83+3AMsAjSv7wHj0jDm7E1A3IV7o77zQX7g33 L2igQMpSXb83RvPMxOfdM8tdLVDT4rJZqAlLGZR9X7UhfBCpSB5Xnsx9umWIXtaaAdZW hRMA== X-Gm-Message-State: AOAM532wDeFysY1Gi/AZshyqt6ZIbMOo69DoFc3AqRxNaQiI9ehVF5DM QT5a6gAt4jFmYTHKSWHw6BZIpw== X-Google-Smtp-Source: ABdhPJx37Cjmlb4fgq/grqKCCp37y8t5Mz28eOZMNIB2vWtdgu/4b448hmjy5S8hmkcygKAt/hypYw== X-Received: by 2002:a5d:5009:: with SMTP id e9mr3539688wrt.104.1603270640046; Wed, 21 Oct 2020 01:57:20 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id q8sm2675939wro.32.2020.10.21.01.57.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Oct 2020 01:57:19 -0700 (PDT) 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, linux-s390@vger.kernel.org, Daniel Vetter , Daniel Vetter , Jason Gunthorpe , Kees Cook , Dan Williams , Andrew Morton , John Hubbard , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Jan Kara , Bjorn Helgaas , linux-pci@vger.kernel.org, Daniel Vetter Subject: [PATCH v3 12/16] PCI: Obey iomem restrictions for procfs mmap Date: Wed, 21 Oct 2020 10:56:51 +0200 Message-Id: <20201021085655.1192025-13-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> References: <20201021085655.1192025-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-media@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(). 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) -- 2.28.0