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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 5CC22C46477 for ; Tue, 18 Jun 2019 16:01:41 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 1EC5B214AF for ; Tue, 18 Jun 2019 16:01:40 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1EC5B214AF Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 874048E0005; Tue, 18 Jun 2019 12:01:40 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 824548E0001; Tue, 18 Jun 2019 12:01:40 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 73A4A8E0005; Tue, 18 Jun 2019 12:01:40 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from mail-pl1-f197.google.com (mail-pl1-f197.google.com [209.85.214.197]) by kanga.kvack.org (Postfix) with ESMTP id 3D8B28E0001 for ; Tue, 18 Jun 2019 12:01:40 -0400 (EDT) Received: by mail-pl1-f197.google.com with SMTP id b24so8040990plz.20 for ; Tue, 18 Jun 2019 09:01:40 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-original-authentication-results:x-gm-message-state:message-id :subject:from:to:cc:date:in-reply-to:references:mime-version :content-transfer-encoding; bh=6E2GD28gLWT06212squaTJfa5siGlOHjnRSYK5oIen8=; b=buwBJm4lMpkk2PGRtYZ4f8TgAPgRKKGpl0B4QZcTnHwbzLmOMGzYThqwuOE3D091nq q8CYCfJz6hVw0YgfZpeUTHxadoGyOnhazuulSZ2J7+DJ9NOy7U8KKnAPnvYMlBRGgs61 4JVQ1g7u1SlUPdr9peuca01mULGoKOgDCr6FiIk2DG/QXNEGf8+q0w+hCSwezstG9x3w ONNS7MujK5IlXVo8qgJeAqf3TQ8sqq4/G3P3YUKoQxfXNeqL1/UmGwgxyw5X2qHSTzCX mrk26BujHK2YnEu7ALzourgkPrOmVxQ1xfbPwkyOs4woO4g0GdM/Sr/jTdzuq39OmuFD +6Kw== X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of yu-cheng.yu@intel.com designates 134.134.136.100 as permitted sender) smtp.mailfrom=yu-cheng.yu@intel.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com X-Gm-Message-State: APjAAAXzCDT2d//x88htrvBGkvKhR6XxWOhcL8AR21LZHqAr0npteO6G RmSgdtj0TQYcM5vpyfwkt5zkQeY2C3ypuOWYjyPGFGqyu8jbgtVW+AMFItnpEc36+ruQMyFbb9l BoKqlFAYnhiy6Weqq5wOElTLYWk7hCXRj017BVpdzp9yKybmuW2Jeau+R8G4IlsLysQ== X-Received: by 2002:a17:90a:3724:: with SMTP id u33mr5878652pjb.19.1560873699948; Tue, 18 Jun 2019 09:01:39 -0700 (PDT) X-Google-Smtp-Source: APXvYqxA8cJEVb/0rFmaboZegim9P3GhLBxmBXPxz55pY71WwXLRA4rEuZ1Jc8jRfOgikyKnBrc5 X-Received: by 2002:a17:90a:3724:: with SMTP id u33mr5878588pjb.19.1560873699298; Tue, 18 Jun 2019 09:01:39 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1560873699; cv=none; d=google.com; s=arc-20160816; b=A7bUE7aFczqe0k5umQ2bkFCY5PDHiK1pioQ3V2WaV1pLI5DY3j1WS+EugBd9MMy2hT nyPDSsJYe9a2IBhYwR6p2VXSQ2IlPed4bV9B55R3GsrD3eeektdiwlsSZC8XdQdDwo4y n3miqY0phE/e++GVqDuYLpaTxTGCoY9+4v3khZ5LNNilpMTzz3HhH7lPv4hkG/t99ERG WP/DhQ6kA9oi4S/QwdJTvv59jhjcZKZ7o9j1wwKHFsY1gp3hMw6KgaHaZnJQrNVo+RKB qc5ffdzf9Dh8T7xIr+oVMdMEy2OrPrZvENYK65ZUhC4nIVd+jtr0fJjrd4s4cNucYFdg uALA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=content-transfer-encoding:mime-version:references:in-reply-to:date :cc:to:from:subject:message-id; bh=6E2GD28gLWT06212squaTJfa5siGlOHjnRSYK5oIen8=; b=tlyLl28sTD8stkhXxeh3/CuO6GMbFCiUTnaciGuRjaclxfhEpmvetbFMGJQT4+2s02 vV8zio8hS41k1kIIhK8hq9KCaRI7kWN6HZDePziIYn+No7rLAjnqxR/vtxZJGL1BssEV IzcDyXI3iD8TOuW0Lla5bE6osReRYuaarskUnBsXHIRA7EIeVebMJ32gvgw1yMCHiiVp kM0x26zU4RkSWek/gOglanyHFXQhMYg7yp9HWtZoxiM+/kZBsN3CBt2oNYrx/4kxVi1i uULR6qPbkBukH/Gy/9iMnNK6+JoeKDcsSAnZs0VK7+LFU2w9r5EyHM5qQTQ2ngCagXcv Dv7A== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of yu-cheng.yu@intel.com designates 134.134.136.100 as permitted sender) smtp.mailfrom=yu-cheng.yu@intel.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com Received: from mga07.intel.com (mga07.intel.com. [134.134.136.100]) by mx.google.com with ESMTPS id h32si2335578pld.402.2019.06.18.09.01.39 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 18 Jun 2019 09:01:39 -0700 (PDT) Received-SPF: pass (google.com: domain of yu-cheng.yu@intel.com designates 134.134.136.100 as permitted sender) client-ip=134.134.136.100; Authentication-Results: mx.google.com; spf=pass (google.com: domain of yu-cheng.yu@intel.com designates 134.134.136.100 as permitted sender) smtp.mailfrom=yu-cheng.yu@intel.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=intel.com X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga105.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 18 Jun 2019 09:01:38 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.63,389,1557212400"; d="scan'208";a="357901271" Received: from yyu32-desk1.sc.intel.com ([10.144.153.205]) by fmsmga005.fm.intel.com with ESMTP; 18 Jun 2019 09:01:38 -0700 Message-ID: <1ca57aaae8a2121731f2dcb1a137b92eed39a0d2.camel@intel.com> Subject: Re: [PATCH v7 22/27] binfmt_elf: Extract .note.gnu.property from an ELF file From: Yu-cheng Yu To: Florian Weimer Cc: Dave Martin , Peter Zijlstra , Thomas Gleixner , x86@kernel.org, "H. Peter Anvin" , Ingo Molnar , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-api@vger.kernel.org, Arnd Bergmann , Andy Lutomirski , Balbir Singh , Borislav Petkov , Cyrill Gorcunov , Dave Hansen , Eugene Syromiatnikov , "H.J. Lu" , Jann Horn , Jonathan Corbet , Kees Cook , Mike Kravetz , Nadav Amit , Oleg Nesterov , Pavel Machek , Randy Dunlap , "Ravi V. Shankar" , Vedvyas Shanbhogue Date: Tue, 18 Jun 2019 08:53:29 -0700 In-Reply-To: <87pnna7v1d.fsf@oldenburg2.str.redhat.com> References: <87lfy9cq04.fsf@oldenburg2.str.redhat.com> <20190611114109.GN28398@e103592.cambridge.arm.com> <031bc55d8dcdcf4f031e6ff27c33fd52c61d33a5.camel@intel.com> <20190612093238.GQ28398@e103592.cambridge.arm.com> <87imt4jwpt.fsf@oldenburg2.str.redhat.com> <20190618091248.GB2790@e103592.cambridge.arm.com> <20190618124122.GH3419@hirez.programming.kicks-ass.net> <87ef3r9i2j.fsf@oldenburg2.str.redhat.com> <20190618125512.GJ3419@hirez.programming.kicks-ass.net> <20190618133223.GD2790@e103592.cambridge.arm.com> <87pnna7v1d.fsf@oldenburg2.str.redhat.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.28.1-2 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, 2019-06-18 at 17:49 +0200, Florian Weimer wrote: > * Yu-cheng Yu: > > > The kernel looks at only ld-linux. Other applications are loaded by ld- > > linux. > > So the issues are limited to three versions of ld-linux's. Can we somehow > > update those?? > > I assumed that it would also parse the main executable and make > adjustments based on that. Yes, Linux also looks at the main executable's header, but not its NT_GNU_PROPERTY_TYPE_0 if there is a loader. > > ld.so can certainly provide whatever the kernel needs. We need to tweak > the existing loader anyway. > > No valid statically-linked binaries exist today, so this is not a > consideration at this point. So from kernel, we look at only PT_GNU_PROPERTY? Yu-cheng