From patchwork Thu Jun 27 13:03:14 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Potapenko X-Patchwork-Id: 11019683 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 5951613B4 for ; Thu, 27 Jun 2019 13:03:26 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 4B28328B15 for ; Thu, 27 Jun 2019 13:03:26 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 3D86028B13; Thu, 27 Jun 2019 13:03:26 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-14.5 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,RCVD_IN_DNSWL_HI,USER_IN_DEF_DKIM_WL autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 6FB7928B08 for ; Thu, 27 Jun 2019 13:03:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726465AbfF0NDZ (ORCPT ); Thu, 27 Jun 2019 09:03:25 -0400 Received: from mail-qt1-f201.google.com ([209.85.160.201]:36917 "EHLO mail-qt1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726443AbfF0NDY (ORCPT ); Thu, 27 Jun 2019 09:03:24 -0400 Received: by mail-qt1-f201.google.com with SMTP id g56so2304443qte.4 for ; Thu, 27 Jun 2019 06:03:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:message-id:mime-version:subject:from:to:cc; bh=nkuGlh1b+gHriNiPX/Ra1Bh+mzhPWQ4oquwmkvO30T4=; b=iBxY0ZFgO84nGjeC4loAOGtpGOs9Yd+fQ6I8SutqbHSeU1rnf5JzTtlDWjLJJd0/Nr zxHj+IuFkHMyvyWAC33SPbFZGoTK8algV818k/Q71cVpkVHuMBWJKC2ksgxr8pUJEAaP dutE+V9ZPEuAoDr2MSkkEBS313KEVD9qNR/3caN6hxA6tFWKop/qr1X7z/Lboo8tZQwW I254YFH5T0q6XJAe0Tm+VeVcDZaaB1k/+ZUj+rUz7ui9QpYJ0gGlpps4Mr8zWe3VA6HN icTzVRARAhzNdo2Mw8haBEcLFFm82kBhXJPRKv+9+EU9hoEDndfPYq5OKewAgDwKnu5l kK2Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc; bh=nkuGlh1b+gHriNiPX/Ra1Bh+mzhPWQ4oquwmkvO30T4=; b=q0QXpyD99ZhEK07SQv1LMzf2+f+lqIqsWADSQ2RRKvd5/WglofC3MeqSPw520ivlRI X8uMaFLZZsvLSPCVep+yfl/79paGID8jH2xtIRycF6LhmnFAC/BLP92cAHIhTBrpa5VO MlBGAUlwgx/m7Xd1Cr8DxbZrHR8aGZTJZLwE5/039RWmhluCo1Lz+P+UqeEQZZK/aKcg yKPwbYDrS3Bmtpt7FpMDRDxzIMNSsObQ+jRzqP2f95C1wWfkbJdOGxl435BmHUHOB2yk qsLKVp92SpJvOXg6SkRSZrs7rgE4U/9gmg8kUeIDpti1AA2PmV3MQIITrVrZrKWya73Z sruQ== X-Gm-Message-State: APjAAAUVTL1N11WbcKyHv2ZdwwIcXqGVsXyN7LzChbQ4jiDdbH+jmLVZ St8YO/mZ+YBhgFzTh0qArP+4CMSB5N4= X-Google-Smtp-Source: APXvYqyb2fwdKxY/0wj7U997eReOnW8Kj1pQxO+Xnu7fYid+NvlrsgBAglMJ1qJ5NwkNSnI/uio1IDG6JGY= X-Received: by 2002:a05:620a:35e:: with SMTP id t30mr3084826qkm.1.1561640603625; Thu, 27 Jun 2019 06:03:23 -0700 (PDT) Date: Thu, 27 Jun 2019 15:03:14 +0200 Message-Id: <20190627130316.254309-1-glider@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.22.0.410.gd8fdbe21b5-goog Subject: [PATCH v9 0/3] add init_on_alloc/init_on_free boot options From: Alexander Potapenko To: Andrew Morton , Christoph Lameter , Kees Cook Cc: Alexander Potapenko , Masahiro Yamada , Michal Hocko , James Morris , "Serge E. Hallyn" , Nick Desaulniers , Kostya Serebryany , Dmitry Vyukov , Sandeep Patil , Laura Abbott , Randy Dunlap , Jann Horn , Mark Rutland , Marco Elver , Qian Cai , linux-mm@kvack.org, linux-security-module@vger.kernel.org, kernel-hardening@lists.openwall.com Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: X-Virus-Scanned: ClamAV using ClamSMTP Provide init_on_alloc and init_on_free boot options. These are aimed at preventing possible information leaks and making the control-flow bugs that depend on uninitialized values more deterministic. Enabling either of the options guarantees that the memory returned by the page allocator and SL[AU]B is initialized with zeroes. SLOB allocator isn't supported at the moment, as its emulation of kmem caches complicates handling of SLAB_TYPESAFE_BY_RCU caches correctly. Enabling init_on_free also guarantees that pages and heap objects are initialized right after they're freed, so it won't be possible to access stale data by using a dangling pointer. As suggested by Michal Hocko, right now we don't let the heap users to disable initialization for certain allocations. There's not enough evidence that doing so can speed up real-life cases, and introducing ways to opt-out may result in things going out of control. To: Andrew Morton To: Christoph Lameter To: Kees Cook Cc: Masahiro Yamada Cc: Michal Hocko Cc: James Morris Cc: "Serge E. Hallyn" Cc: Nick Desaulniers Cc: Kostya Serebryany Cc: Dmitry Vyukov Cc: Sandeep Patil Cc: Laura Abbott Cc: Randy Dunlap Cc: Jann Horn Cc: Mark Rutland Cc: Marco Elver Cc: Qian Cai Cc: linux-mm@kvack.org Cc: linux-security-module@vger.kernel.org Cc: kernel-hardening@lists.openwall.com Alexander Potapenko (2): mm: security: introduce init_on_alloc=1 and init_on_free=1 boot options mm: init: report memory auto-initialization features at boot time .../admin-guide/kernel-parameters.txt | 9 +++ drivers/infiniband/core/uverbs_ioctl.c | 2 +- include/linux/mm.h | 24 +++++++ init/main.c | 24 +++++++ mm/dmapool.c | 4 +- mm/page_alloc.c | 71 +++++++++++++++++-- mm/slab.c | 16 ++++- mm/slab.h | 20 ++++++ mm/slub.c | 41 +++++++++-- net/core/sock.c | 2 +- security/Kconfig.hardening | 29 ++++++++ 11 files changed, 224 insertions(+), 18 deletions(-) --- v3: dropped __GFP_NO_AUTOINIT patches v5: dropped support for SLOB allocator, handle SLAB_TYPESAFE_BY_RCU v6: changed wording in boot-time message v7: dropped the test_meminit.c patch (picked by Andrew Morton already), minor wording changes v8: fixes for interoperability with other heap debugging features v9: added support for page/slab poisoning