From patchwork Wed Oct 7 16:44:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Daniel Vetter X-Patchwork-Id: 11821187 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 DFE4B14D5 for ; Wed, 7 Oct 2020 16:45:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B4021216C4 for ; Wed, 7 Oct 2020 16:45:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ffwll.ch header.i=@ffwll.ch header.b="jOfg2aPb" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728432AbgJGQpq (ORCPT ); Wed, 7 Oct 2020 12:45:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52724 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728425AbgJGQor (ORCPT ); Wed, 7 Oct 2020 12:44:47 -0400 Received: from mail-wr1-x441.google.com (mail-wr1-x441.google.com [IPv6:2a00:1450:4864:20::441]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 622CEC0613D5 for ; Wed, 7 Oct 2020 09:44:47 -0700 (PDT) Received: by mail-wr1-x441.google.com with SMTP id h7so2992382wre.4 for ; Wed, 07 Oct 2020 09:44:47 -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=P02GBIE7m0UGj1Ja16VfRtl1rny8rrQDbz10f0cDTbo=; b=jOfg2aPb+p2PctbbcpGPk2VTV8x+SKSCmFeHr5kNnGpMzP9+KndzTdMPcmKSmVIBOL Sn8AtpmXpRju+60FUKJKw5WoTBtH4QSJvymhz/0+3ZeCxQuRUo3jPklVq4Ib9EuOwEj2 sPoeQoG2BgasR1J/L7Iui7jQ8XopY468hCzwc= 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=P02GBIE7m0UGj1Ja16VfRtl1rny8rrQDbz10f0cDTbo=; b=cjZOU4tb0UV42mllo6r8xDblZ7l24ob0Hen68HCJkmVjVKQweKK9LSKY6gbWJUwGdP Qu7u3aQ4fePjEYaWqSEtSBHKbQYG+xGTBABuBhb4xge/DNOUdGqvnHnI966TZzT2SZtt ysl5fzGlZMDy19v5LAGpCaaH72kqglmVHG3cg+M/Y+JSc9NDyXo3mpITxlrV6b2DkG0j vn+GXfkybCLQlTjm9E4Wi17FssKmWa6t1o52G2AxIip4ZCmHMZLLLItyEH6JZoBAEZzy QvoA/H7fIgl4tI/IwO8ozpJZeuMk8lPJzcBjiEmmZGWOcfEn/+1d5vUri23sPi8N6m4g pLCg== X-Gm-Message-State: AOAM532CwjxuOO4FrjdefQR4m7FWW4wQDtDdFKLB7TxTJimvmFtjmhCq I4ikyuTExIDsJ/HRUzTo/c9TcQ== X-Google-Smtp-Source: ABdhPJzCDfyCaOqONShrGzC8VJoQgNBmutXD42q/UwtrqERpH1arTrrensBhgkJDw5zkDOp6xBcjVA== X-Received: by 2002:adf:ba4f:: with SMTP id t15mr4383017wrg.335.1602089086053; Wed, 07 Oct 2020 09:44:46 -0700 (PDT) Received: from phenom.ffwll.local ([2a02:168:57f4:0:efd0:b9e5:5ae6:c2fa]) by smtp.gmail.com with ESMTPSA id z191sm3332280wme.40.2020.10.07.09.44.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Oct 2020 09:44:45 -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 09/13] PCI: obey iomem restrictions for procfs mmap Date: Wed, 7 Oct 2020 18:44:22 +0200 Message-Id: <20201007164426.1812530-10-daniel.vetter@ffwll.ch> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201007164426.1812530-1-daniel.vetter@ffwll.ch> References: <20201007164426.1812530-1-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. 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 --- 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)