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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CF551CDB47E for ; Wed, 18 Oct 2023 11:46:04 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230003AbjJRLqD (ORCPT ); Wed, 18 Oct 2023 07:46:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44714 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230059AbjJRLpt (ORCPT ); Wed, 18 Oct 2023 07:45:49 -0400 Received: from mail-ed1-x536.google.com (mail-ed1-x536.google.com [IPv6:2a00:1450:4864:20::536]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F2218FE for ; Wed, 18 Oct 2023 04:45:44 -0700 (PDT) Received: by mail-ed1-x536.google.com with SMTP id 4fb4d7f45d1cf-53f6ccea1eeso611318a12.3 for ; Wed, 18 Oct 2023 04:45:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1697629543; x=1698234343; darn=vger.kernel.org; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:sender:from:to:cc:subject:date:message-id :reply-to; bh=VTINOs7IVK0NtmhaZm8Hxfp0zmQge6ZaL9u3C96Qtkk=; b=RrSLeh03Z/Q/dAMWzai1S/m+J0txdbn5j10o+rQS7UxhfywO8gQb9hFuUcnmnWvQ1q nrGatzVJl7/NZS4KwmmR5U2qc7kg34Cq1st3cCVLeO/xUKYXa5nqY6SSM2fdfuB3gl0r 9DIK3WoHBDO3WcbkF7fKFoQq94vtoAT43uXQI8OEC3kktqbpioVnX3d2eqmTD3UWR93Z vOw12465Fe5SiSbwv6qRxmY7LujZcR1TACGrMNHByj+IQQCmr+XTVoJO+IwBTLZmBY77 YSoJD4EWNkhloUsCnZIXokTmn/Zg5YblrxAwFX3h+S77ev5XBoWM0sN4PtfmN0fqZh2T nOlg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1697629543; x=1698234343; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:sender:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=VTINOs7IVK0NtmhaZm8Hxfp0zmQge6ZaL9u3C96Qtkk=; b=M+/SLogiqbt701pbJxuLO213ndKelJ2oqfzvkLqJtVIKrCEECMz6VDzivs43gzKuW+ C2Z07UJJcHSQJvw6lfQspHMUQU5dQOJvPkKcAx1M8OHVPnrzXlfhF5Ul/332viBLVMdn W+T/uM5jCUXNrvvJgJurT1aTX62EQnm6uA686n+XWR9tnquhEfVvR+c+F5cMM0JO5jyL UMBVoXx+lb2iOtZqbFqq2GG9N9jaVr255Kj/R1nLcha/2kU3wFq6QHnOt+l/ZT2FZMj6 xivTvDCIYNWEj9o1wedNhq5pIIJ3wx0E+ZpSsXMxnQNaGyw3gROXvuiPjws4jnxsdPie 5IUg== X-Gm-Message-State: AOJu0YzwgNDtwrbv41XRgkOPsTZbVgVaJ7bvgyF5f5RgFbe2L28FC/fv b1Gh3U42fUsHM+y10auhGlM= X-Google-Smtp-Source: AGHT+IGqXeNQawRBulQQP5v5T/ldgBTck2xmiz8UH0flZ10jQ2YZnQiB6VM/bXbO7Y22mMXA5ybPvg== X-Received: by 2002:a05:6402:4410:b0:530:bd6b:7a94 with SMTP id y16-20020a056402441000b00530bd6b7a94mr4825384eda.24.1697629543307; Wed, 18 Oct 2023 04:45:43 -0700 (PDT) Received: from gmail.com (1F2EF7B2.nat.pool.telekom.hu. [31.46.247.178]) by smtp.gmail.com with ESMTPSA id t29-20020a50ab5d000000b0053ed70ebd7csm2720856edc.31.2023.10.18.04.45.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Oct 2023 04:45:42 -0700 (PDT) Sender: Ingo Molnar Date: Wed, 18 Oct 2023 13:45:40 +0200 From: Ingo Molnar To: "H. Peter Anvin" , Kristen Carlson Accardi Cc: Hou Wenlong , linux-kernel@vger.kernel.org, Lai Jiangshan , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "maintainer:X86 ARCHITECTURE 32-BIT AND 64-BIT" , Josh Poimboeuf , Anshuman Khandual , Mike Rapoport , Pasha Tatashin Subject: Re: [PATCH RFC 1/7] x86/head/64: Mark startup_gdt and startup_gdt_descr as __initdata Message-ID: References: <20231017072311.GA46993@k08j02272.eu95sqa> <77B66FD0-ED28-4D3F-8D28-467AC4FCD00D@zytor.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <77B66FD0-ED28-4D3F-8D28-467AC4FCD00D@zytor.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * H. Peter Anvin wrote: > If the goal is better KASLR, then what we really should spend time on was > Kristen Accardi's fgKASLR patches, which not only exponentially(!) > increases the randomization entrophy but also *actually* avoids the "one > leak and it's over" problem. Agreed. Going by this version of function-granularity KASLR from 3 years ago: https://lwn.net/Articles/824307/ https://lwn.net/ml/linux-kernel/20200623172327.5701-1-kristen@linux.intel.com/ The fgKASLR feature looks entirely viable to me. Back then I presumed it would get iterated beyond v3, and then it fell off my radar. :-/ If Kristen or someone else would like to dust this off & submit a fresh version it would be much appreciated! Thanks, Ingo