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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,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 853FBFA372C for ; Fri, 8 Nov 2019 12:05:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5C60F2085B for ; Fri, 8 Nov 2019 12:05:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573214700; bh=lOcuIgcRIm7GuYDO3o9yyq1tvpvKmJ4QikQP3ew0eyc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=v4WDKJD6ef+KX9cEgfJQacvey0ZeU3AXmyniVejb142PqTBqM4OuOb6iN9WjeV5vK P2sJgleutGek9yLwFv5tQY+aMoenTRDeFIdQiOJGeZzcNaz2GLVTaq/DCLRRSIC4jn 00j35ZCNFARKlLBYHWT4G+TnSiaM6AImk8dTKWjc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2391823AbfKHME6 (ORCPT ); Fri, 8 Nov 2019 07:04:58 -0500 Received: from mail.kernel.org ([198.145.29.99]:55508 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389703AbfKHLl4 (ORCPT ); Fri, 8 Nov 2019 06:41:56 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 69F8120656; Fri, 8 Nov 2019 11:41:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1573213316; bh=lOcuIgcRIm7GuYDO3o9yyq1tvpvKmJ4QikQP3ew0eyc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=az7hzMrB3H3+miH+EJmVYKOD9J0S/n9T89RoM1AdJd+ROhHRIyohqd45UuE/2vCt4 hxGHYlFi98n8yzqI9uLonOWsIauNc5fiU/wClgCKl4ySKRxkTZPugNA8w4KyEIkDdX 689sofICA9X81KI+iEmHXXUGgR6EUEQk+Q7ddolQ= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Lao Wei , Mauro Carvalho Chehab , Sasha Levin , linux-media@vger.kernel.org Subject: [PATCH AUTOSEL 4.19 160/205] media: fix: media: pci: meye: validate offset to avoid arbitrary access Date: Fri, 8 Nov 2019 06:37:07 -0500 Message-Id: <20191108113752.12502-160-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191108113752.12502-1-sashal@kernel.org> References: <20191108113752.12502-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Lao Wei [ Upstream commit eac7230fdb4672c2cb56f6a01a1744f562c01f80 ] Motion eye video4linux driver for Sony Vaio PictureBook desn't validate user-controlled parameter 'vma->vm_pgoff', a malicious process might access all of kernel memory from user space by trying pass different arbitrary address. Discussion: http://www.openwall.com/lists/oss-security/2018/07/06/1 Signed-off-by: Lao Wei Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- drivers/media/pci/meye/meye.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/pci/meye/meye.c b/drivers/media/pci/meye/meye.c index 8001d3e9134e4..db2a7ad1e5231 100644 --- a/drivers/media/pci/meye/meye.c +++ b/drivers/media/pci/meye/meye.c @@ -1460,7 +1460,7 @@ static int meye_mmap(struct file *file, struct vm_area_struct *vma) unsigned long page, pos; mutex_lock(&meye.lock); - if (size > gbuffers * gbufsize) { + if (size > gbuffers * gbufsize || offset > gbuffers * gbufsize - size) { mutex_unlock(&meye.lock); return -EINVAL; } -- 2.20.1