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=-5.3 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 EA5E5C3F2D2 for ; Thu, 5 Mar 2020 20:50:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C2E3D20870 for ; Thu, 5 Mar 2020 20:50:43 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=tycho-ws.20150623.gappssmtp.com header.i=@tycho-ws.20150623.gappssmtp.com header.b="ulRcbiJE" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726368AbgCEUum (ORCPT ); Thu, 5 Mar 2020 15:50:42 -0500 Received: from mail-yw1-f65.google.com ([209.85.161.65]:38505 "EHLO mail-yw1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726099AbgCEUum (ORCPT ); Thu, 5 Mar 2020 15:50:42 -0500 Received: by mail-yw1-f65.google.com with SMTP id 10so82473ywv.5 for ; Thu, 05 Mar 2020 12:50:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=tycho-ws.20150623.gappssmtp.com; s=20150623; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=ZN2bKPbKeIRtrM9iIgiOAYxD5vcZHWo0jv5xrjPRAk0=; b=ulRcbiJE8IyxHOYf0toI7GVOJUnzYm1nE08URECAHtMkc7tW2VwDS/KoP8Cp18LA9g WIWEmqqihik7TT2J6KG/KWusnIMnKOwBj7PvzuDBl7C8BiCAKyO9TgA259u1JZg7Q9BI KPSWVsP98pe/fehSp3HH5r543p7r+AYzcuS3G3tzMa8BAk8/QWvg3rLv8iX4x/9cGBVh zkr7/LrGLKEW1wwDndGzRCIY/Vn/vgUXLlYxa/Mru2MoKEOILj417aBEf7GiAVhkvzcQ ZmjnKsBLN0hKCAkF4RzJyh4Du0apmJ4JHK4wWErt8fB2R+Yh4I0s8LmkaXjc7UYn0/Zy Yzug== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to:user-agent; bh=ZN2bKPbKeIRtrM9iIgiOAYxD5vcZHWo0jv5xrjPRAk0=; b=cbyDjhPiR5jSoE1rOVYFaAYtql2svoob1R0mB4k+mIonlCtWtdm3fZ/BS7gTvxPIe8 y59xnPShgNU9IR5sPMi1VQayaGM9WvgdYGJfJMiu0N4vojmpnuHaFsURJAh1gIVrzJ6v Q7CeiC8dgOVkOLh7Hx/8m4qBs495fPIioHtYSEYmYhursBAzuv2hXVfgUt/vJH292DKD cSWEEKisJQ2hqmQrWOYc0mhnuJIJj17gbQkODXq1tW2pHlZK/fIrsOWrOOonxvGBBBCC BMkOAwszDpaeEAy2kX/108W35BYknoP3nlWcYzT60n4EkrMx1aQrFYpMq4QEFKYuv6Ii 1ubg== X-Gm-Message-State: ANhLgQ07tDYB6k1VWuXgI6FsB6LcWMdCGajohRUaxYfO9fOEttu8ZWdc +9JYLhVPIVmg4Z/WlHc80evvXQ== X-Google-Smtp-Source: ADFU+vuf8b03n0ektuyVOOaTbgELLufIJbGO8TesTTpByeRD4Pmk6NbMDojOYTn39X9+RHrcH3RU+g== X-Received: by 2002:a0d:e7c6:: with SMTP id q189mr296834ywe.329.1583441441200; Thu, 05 Mar 2020 12:50:41 -0800 (PST) Received: from cisco ([2607:fb90:17d4:133:1002:9a44:e2a2:4464]) by smtp.gmail.com with ESMTPSA id h139sm12575001ywa.35.2020.03.05.12.50.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Mar 2020 12:50:40 -0800 (PST) Date: Thu, 5 Mar 2020 13:50:34 -0700 From: Tycho Andersen To: Arvind Sankar Cc: Kees Cook , "Tobin C . Harding" , kernel-hardening@lists.openwall.com, Nick Hu , Greentime Hu , Vincent Chen , linux-kernel@vger.kernel.org Subject: Re: [PATCH] nds32/mm: Stop printing the virtual memory layout Message-ID: <20200305205034.GC6506@cisco> References: <202003021038.8F0369D907@keescook> <20200305150639.834129-1-nivedita@alum.mit.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200305150639.834129-1-nivedita@alum.mit.edu> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Mar 05, 2020 at 10:06:39AM -0500, Arvind Sankar wrote: > For security, don't display the kernel's virtual memory layout. > > Kees Cook points out: > "These have been entirely removed on other architectures, so let's > just do the same for ia32 and remove it unconditionally." > > 071929dbdd86 ("arm64: Stop printing the virtual memory layout") > 1c31d4e96b8c ("ARM: 8820/1: mm: Stop printing the virtual memory layout") > 31833332f798 ("m68k/mm: Stop printing the virtual memory layout") > fd8d0ca25631 ("parisc: Hide virtual kernel memory layout") > adb1fe9ae2ee ("mm/page_alloc: Remove kernel address exposure in free_reserved_area()") > > Signed-off-by: Arvind Sankar Acked-by: Tycho Andersen