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=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 92256C3F2D1 for ; Thu, 5 Mar 2020 20:49:47 +0000 (UTC) Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.kernel.org (Postfix) with SMTP id E7B3920870 for ; Thu, 5 Mar 2020 20:49:46 +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="oCjzxHqs" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E7B3920870 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=tycho.ws Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kernel-hardening-return-18085-kernel-hardening=archiver.kernel.org@lists.openwall.com Received: (qmail 21511 invoked by uid 550); 5 Mar 2020 20:49:39 -0000 Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-ID: Received: (qmail 20455 invoked from network); 5 Mar 2020 20:49:38 -0000 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=5zmgxN7VRZXC7kbix0t7HZalzUvTentTfjnGm/3hMTE=; b=oCjzxHqsExisvhlxj2vLbWI+LleP320DIA63HiMC3CvCVE+taSKApySOErK4ZOUpEt J9NEAZwHZEmWGlvwUQRcTkTuMMzGpWOQXnz4PiGwEe5CWdNMxavPFDWW2EAGixCQhviZ +I4OFEjaLBOeE10vj1L+uU8FohllLaMLab6RAz0XnnMv15zFailN4BfRGHiOaoAiaIYw 8y7qzIaNpPZH88IK1Cp3LTrqck3d8e8y5MxZg3BI38HsHzkuz/kBeEblxNYQ8e5miY8W LR739rAjjIcqXS5O5Y8bv+USeISElSCSY4fbxmQTRCK7NaVpZZ18/K2gcxXqCO097Yi6 pKWw== 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=5zmgxN7VRZXC7kbix0t7HZalzUvTentTfjnGm/3hMTE=; b=UUSQwjsF4GjltPwE+oMzdiHEBVfFJckectzvarFYA9I382O5fMGrfCAnpLMEMtEjDO qkADJ2dGKCc1b+rfMsXXOyXmkgo/CP82jXJaFxZl3tkpBVb+WWLU7ijkCQa7Qk8GRUT+ tAi7jXY9lYg8/mytAl0gWsy3jYaDOPgi1nPLRXvcCAzmhjOvxKWKw4d/ChcBQzUk3UYA SNcphNXTm9453FKnOrZcRXAYHD8FfaUmQ2My0hGK1Hqe92X5wShCw11S5rtykscWqJWq PgW6MZaZWN90F9E97Q2YgtQjGK//7W9UbiQQXmT91pj3UpNmKxdgs/KQ/+6AMYe7U+IG mYgQ== X-Gm-Message-State: ANhLgQ0KrHJ+tGWiyavB9oEO4HnpApbD2TSfsqxaOx437LptEErPCgpC pRZRoOFJ9TC/8B7K2O98OoTzrw== X-Google-Smtp-Source: ADFU+vut5SaFR53pXBOtJjgao2EQ5xqKFPyU2dbqIJP6N0WO2apubN/ljUNmlK9XJyrF+68bzRL6FA== X-Received: by 2002:a25:860d:: with SMTP id y13mr137357ybk.310.1583441366443; Thu, 05 Mar 2020 12:49:26 -0800 (PST) Date: Thu, 5 Mar 2020 13:49:08 -0700 From: Tycho Andersen To: Arvind Sankar Cc: Kees Cook , "Tobin C . Harding" , kernel-hardening@lists.openwall.com, Dave Hansen , Andy Lutomirski , Peter Zijlstra , x86@kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3] x86/mm/init_32: Stop printing the virtual memory layout Message-ID: <20200305204908.GA6506@cisco> References: <202003021039.257258E1B@keescook> <20200305150152.831697-1-nivedita@alum.mit.edu> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200305150152.831697-1-nivedita@alum.mit.edu> User-Agent: Mutt/1.10.1 (2018-07-13) On Thu, Mar 05, 2020 at 10:01:52AM -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