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=-20.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, 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 A5963C4321E for ; Mon, 20 Sep 2021 18:08:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8FCB761268 for ; Mon, 20 Sep 2021 18:08:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1359360AbhITSJc (ORCPT ); Mon, 20 Sep 2021 14:09:32 -0400 Received: from mail.kernel.org ([198.145.29.99]:58468 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1357131AbhITSDB (ORCPT ); Mon, 20 Sep 2021 14:03:01 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id EC4A463231; Mon, 20 Sep 2021 17:16:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1632158204; bh=+bQkeSoKycJg5ylMbQ2oBdL0CsmA1x1GS7XJ33B+czE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cPGxBGXhWq48O+GYz1nINSWXhDL0+HnkXxaoJnlJEUrwrJE0Ifi38RNG+stHAbMp6 XEiM+jCweScai5L0nNBxB54qJV7xxQtkRmnEYrh/5g5Gyk3ViRUcm/tRksu6bFyaTe YuvzScZBh3CI33JYal8f8q/ngvS0gd0W5XLHMhAE= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Iwona Winiarska , Andrew Jeffery , Joel Stanley , Joel Stanley Subject: [PATCH 5.4 015/260] soc: aspeed: lpc-ctrl: Fix boundary check for mmap Date: Mon, 20 Sep 2021 18:40:33 +0200 Message-Id: <20210920163931.638937218@linuxfoundation.org> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20210920163931.123590023@linuxfoundation.org> References: <20210920163931.123590023@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Iwona Winiarska commit b49a0e69a7b1a68c8d3f64097d06dabb770fec96 upstream. The check mixes pages (vm_pgoff) with bytes (vm_start, vm_end) on one side of the comparison, and uses resource address (rather than just the resource size) on the other side of the comparison. This can allow malicious userspace to easily bypass the boundary check and map pages that are located outside memory-region reserved by the driver. Fixes: 6c4e97678501 ("drivers/misc: Add Aspeed LPC control driver") Cc: stable@vger.kernel.org Signed-off-by: Iwona Winiarska Reviewed-by: Andrew Jeffery Tested-by: Andrew Jeffery Reviewed-by: Joel Stanley Signed-off-by: Joel Stanley Signed-off-by: Greg Kroah-Hartman --- drivers/soc/aspeed/aspeed-lpc-ctrl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/soc/aspeed/aspeed-lpc-ctrl.c +++ b/drivers/soc/aspeed/aspeed-lpc-ctrl.c @@ -46,7 +46,7 @@ static int aspeed_lpc_ctrl_mmap(struct f unsigned long vsize = vma->vm_end - vma->vm_start; pgprot_t prot = vma->vm_page_prot; - if (vma->vm_pgoff + vsize > lpc_ctrl->mem_base + lpc_ctrl->mem_size) + if (vma->vm_pgoff + vma_pages(vma) > lpc_ctrl->mem_size >> PAGE_SHIFT) return -EINVAL; /* ast2400/2500 AHB accesses are not cache coherent */