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: 11917637 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=-16.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,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 85F69C6379D for ; Thu, 19 Nov 2020 14:42:28 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 12D3F24706 for ; Thu, 19 Nov 2020 14:42:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="VdR4TRQW" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 12D3F24706 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ffwll.ch Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 2E30D6E58E; Thu, 19 Nov 2020 14:42:27 +0000 (UTC) Received: from mail-wr1-x442.google.com (mail-wr1-x442.google.com [IPv6:2a00:1450:4864:20::442]) by gabe.freedesktop.org (Postfix) with ESMTPS id E998B6E56A for ; Thu, 19 Nov 2020 14:42:09 +0000 (UTC) Received: by mail-wr1-x442.google.com with SMTP id m6so6670737wrg.7 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=tDdD+71xHIx1/v7ZcZlo1ve400y3am4aVnaFJnAxJtN2ernyVeVZ13eWHwrJ1sQFg6 7CBqOUAhfrPf7c6+k14oy6RGx0B+1b1BYIpeEa6CBgftrhNOA9vAA1qaxVGI2ThRRdAY efpMGnuPe7+ucexlqxZ0YSfrEz5BNsyfpcxG8upmqTsH+7taLIqiULEi20TsTZq729Zk 9xZoU8hxkyTVgfdMR6V9V8G0HVLzswi/qs5W8ecPz8nZPuJwPXTPssQu2JEorjN7+jr7 ykMoSAFqGIuwF8YKpS0zELtKcQnckBuSU7OY/3Pw6+76c6YCM7Yy0WGXhThOzcwsY4YI ukxA== X-Gm-Message-State: AOAM532Y8zpi5lognTQlxyyPjz5++2BcU4qWmOEMOrff3ZNtfWJPazzK 7L4z22VNz/6l1tQ3SVMoU4y6wbr5XDvAeA== 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 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 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-samsung-soc@vger.kernel.org, Jan Kara , Kees Cook , kvm@vger.kernel.org, Jason Gunthorpe , Daniel Vetter , linux-pci@vger.kernel.org, linux-mm@kvack.org, =?utf-8?b?SsOpcsO0bWUgR2xp?= =?utf-8?b?c3Nl?= , John Hubbard , Bjorn Helgaas , Daniel Vetter , Dan Williams , Andrew Morton , linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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)