From patchwork Fri Oct 9 07:59:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11825279 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id CE4AE109B for ; Fri, 9 Oct 2020 08:01:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A8A9122276 for ; Fri, 9 Oct 2020 08:01:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="GGX55N30" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732729AbgJIIBQ (ORCPT ); Fri, 9 Oct 2020 04:01:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49536 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732749AbgJIIAN (ORCPT ); Fri, 9 Oct 2020 04:00:13 -0400 Received: from mail-wr1-x444.google.com (mail-wr1-x444.google.com [IPv6:2a00:1450:4864:20::444]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D3334C05BD40 for ; Fri, 9 Oct 2020 01:00:10 -0700 (PDT) Received: by mail-wr1-x444.google.com with SMTP id n18so9252105wrs.5 for ; Fri, 09 Oct 2020 01:00:10 -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=mkr+QLHrHRyzDeEuLV6zjmHQ3ublwStz21KQT1DOayM=; b=GGX55N304bFNQXT7vE1ggs1hCrNO4kTCwZL12SxHZag0+p+9wIk4MXiU4skay+LXim 49xSp0FO/9WgeR/sK6Fi90U35plzqw+Vb29HBAZuQNOnvJt3IwmsbNCeAFjlMohevOl4 MeSmpBQPKt0omjgQbvLdsGQUrxbNL/9LDoUKc= 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=mkr+QLHrHRyzDeEuLV6zjmHQ3ublwStz21KQT1DOayM=; b=MjHOOvoxejeEpZcbfNuPRQ+QXGnVPP/q/DdO9t8kFarmWH3wbZ4et7odWexeryhSaJ nLOAdCA3PJj3Nd0dGgxyGdXY97brBQrp9KPeA/8PPLpxqzhX6dZYjV5Q90gXOX4xXugw F1zz88ks0szMGkag5TFt+3+srSYmEUz1NEEi9M5IzA2gxunxBg+8+UTRi5t1h+srmndc qqy9BB/8HnwATUw8CL8FTj3fmHlf810AO66kd8zuPsIkL2mTE//czQ6e+vWpQ3osf5Ni XQZZaFP/zHShzZ67OE59UfAvvO7ndKOIIs2kmsRRpe3YgbF3HEskOhJX/tMZvF6TZ3TL 7NeQ== X-Gm-Message-State: AOAM533XRtAdRCT+V+UbVTH7rQWsPT/DaCeivhJxVqoq9ZMEsclqofqD UhBMU32urvUl8pHVB671+f2f5Q== X-Google-Smtp-Source: ABdhPJyDv2qPX/s1a3mWcZq1GdiuGUlSH1qbeC8CG58tJ0NKdoFcESH1X88ElvgtpyqLXEEr3X8XWQ== X-Received: by 2002:adf:d841:: with SMTP id k1mr13481898wrl.227.1602230409528; Fri, 09 Oct 2020 01:00:09 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id u17sm11634118wri.45.2020.10.09.01.00.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 09 Oct 2020 01:00:08 -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?b?SsOpcsO0bWUgR2xpc3Nl?= , Jan Kara , Bjorn Helgaas , linux-pci@vger.kernel.org Subject: [PATCH v2 12/17] PCI: Obey iomem restrictions for procfs mmap Date: Fri, 9 Oct 2020 09:59:29 +0200 Message-Id: <20201009075934.3509076-13-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201009075934.3509076-1-daniel.vetter@ffwll.ch> References: <20201009075934.3509076-1-daniel.vetter@ffwll.ch> MIME-Version: 1.0 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 --- 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)