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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 664FBC32792 for ; Thu, 3 Oct 2019 17:17:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2DEE82086A for ; Thu, 3 Oct 2019 17:17:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570123039; bh=yHF9RoZHB6Qm3RCjepEVe+GJFwIebmGSDxiefTu0FjM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=AAn9E1gVU9LYzSdAN0MHxGo9F2jaV5OPsGMOLSvrN4aK17VYHJSzk+NaURGnTCp/5 RvNZacgZOllJdE2BhZraR1f3PhTTFlFg+j2r4+Z3KnhAbJpMoCL/q3AYt9ftDOw5cn UcqDz0nUGGxFw5AAHfo35Z2+gOdLV+Txd6rjQQgk= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390378AbfJCQWs (ORCPT ); Thu, 3 Oct 2019 12:22:48 -0400 Received: from mail.kernel.org ([198.145.29.99]:51464 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390365AbfJCQWm (ORCPT ); Thu, 3 Oct 2019 12:22:42 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 0665D20659; Thu, 3 Oct 2019 16:22:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1570119761; bh=yHF9RoZHB6Qm3RCjepEVe+GJFwIebmGSDxiefTu0FjM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SP+uD7o4NiSFowI2Qys5boR9QOdlg1D3yqE2uFRSejjSUVwDyekoPfY9iau4QGKtF zDpXCuHQXzC+VDl/UadBEZMllvghL3IQl57HiKXG0MPY5X/E6Cxy74WwxYRcMbSvz1 /U7Zqr5Tjdo5yVI1cZMHwVQhgm5PR9KVamP6J0L8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Joonwon Kang , Kees Cook Subject: [PATCH 4.19 156/211] randstruct: Check member structs in is_pure_ops_struct() Date: Thu, 3 Oct 2019 17:53:42 +0200 Message-Id: <20191003154523.683939067@linuxfoundation.org> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20191003154447.010950442@linuxfoundation.org> References: <20191003154447.010950442@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Joonwon Kang commit 60f2c82ed20bde57c362e66f796cf9e0e38a6dbb upstream. While no uses in the kernel triggered this case, it was possible to have a false negative where a struct contains other structs which contain only function pointers because of unreachable code in is_pure_ops_struct(). Signed-off-by: Joonwon Kang Link: https://lore.kernel.org/r/20190727155841.GA13586@host Fixes: 313dd1b62921 ("gcc-plugins: Add the randstruct plugin") Cc: stable@vger.kernel.org Signed-off-by: Kees Cook Signed-off-by: Greg Kroah-Hartman --- scripts/gcc-plugins/randomize_layout_plugin.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) --- a/scripts/gcc-plugins/randomize_layout_plugin.c +++ b/scripts/gcc-plugins/randomize_layout_plugin.c @@ -443,13 +443,13 @@ static int is_pure_ops_struct(const_tree if (node == fieldtype) continue; - if (!is_fptr(fieldtype)) - return 0; - - if (code != RECORD_TYPE && code != UNION_TYPE) + if (code == RECORD_TYPE || code == UNION_TYPE) { + if (!is_pure_ops_struct(fieldtype)) + return 0; continue; + } - if (!is_pure_ops_struct(fieldtype)) + if (!is_fptr(fieldtype)) return 0; }