From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AG47ELtjzyvz2SOdCKcAnBA8X41bkV4YGo45RTc4Uuq34dD90kZMGIanRWad1vpjCRv7AaGw6Mtw ARC-Seal: i=1; a=rsa-sha256; t=1522165118; cv=none; d=google.com; s=arc-20160816; b=uiTKcXdQpJZAnBNdTXSjzlRLi2J6w9AWJiGUERoSqQqSAzsevgOCGjmIIh+YQwB4YT P4jx93wJ4i3wTWorAx3HW4O+pYshM/VwTJbG4oTZ4Gc2Joa4TjFyBjLFZSEWi/2BavUa ZPEfXEjR7AB1SeS9H/aDCdgq24ipBeGpkQfgBOsfrIXRmiPGsPdu7k2EBMcNTfmQzU67 pNhvEulVWOsIXJkO/w2UudW4ts0+A6jFLyS4+7wxVFxw3tarFT6ZCstMA/eCu2k1JSQR T3qi7ZxMNj35q6vSooDoSZco+ufLOikuCc/JpAervrVGEOqJWAxoviaQcYwiN0SOO5Gh tdeA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:message-id:date:subject:cc:to:from:delivered-to :list-id:list-subscribe:list-unsubscribe:list-help:list-post :precedence:mailing-list:arc-authentication-results; bh=oPq+COxaiYMwEjctFPcEkc0a9Du0nzCPWUhSYTXvpXQ=; b=GK+Wul0497MxRkn6cmoTTk6OFSwJMF1Fk+ZIef7UbcqXk7OR32DEhMzyJpW43EC4JW HyaBJHfS/S5RqrBIBVnetx6jbcV2vHLJa287mt1eIHESpsaNu60K6i5FPKmVetJ1tVL0 rMQ2N8D5tPVdO9yBGOtn8n5k8xzHmZwfh9O7Wb+DEcEd9rgvi8LVQViVXaH67S/P1FzD bv0A+n8UP+cQb7hcIKEjCnl2mPPnzddbaOO3YCYSjvVlFQZey5c3zNmRyme774W2PlzA NfSvVOpQDewmVdO10NW6bBX2nQvoZwUaBknc1c5cwpcilhFQ4Li0O5e5+9ANj4R9tP04 10Og== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of kernel-hardening-return-12766-gregkh=linuxfoundation.org@lists.openwall.com designates 195.42.179.200 as permitted sender) smtp.mailfrom=kernel-hardening-return-12766-gregkh=linuxfoundation.org@lists.openwall.com Authentication-Results: mx.google.com; spf=pass (google.com: domain of kernel-hardening-return-12766-gregkh=linuxfoundation.org@lists.openwall.com designates 195.42.179.200 as permitted sender) smtp.mailfrom=kernel-hardening-return-12766-gregkh=linuxfoundation.org@lists.openwall.com Mailing-List: contact kernel-hardening-help@lists.openwall.com; run by ezmlm List-Post: List-Help: List-Unsubscribe: List-Subscribe: From: Igor Stoppa To: , , CC: , , , , , , , , Igor Stoppa Subject: [RFC PATCH v21 0/6] mm: security: ro protection for dynamic data Date: Tue, 27 Mar 2018 18:37:36 +0300 Message-ID: <20180327153742.17328-1-igor.stoppa@huawei.com> X-Mailer: git-send-email 2.14.1 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.122.225.51] X-CFilter-Loop: Reflected X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1596105811324274585?= X-GMAIL-MSGID: =?utf-8?q?1596105811324274585?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: This patch-set introduces the possibility of protecting memory that has been allocated dynamically. The memory is managed in pools: when a memory pool is protected, all the memory that is currently part of it, will become R/O. A R/O pool can be expanded (adding more protectable memory). It can also be destroyed, to recover its memory, but it cannot be turned back into R/W mode. This is intentional. This feature is meant for data that doesn't need further modifications after initialization. However the data might need to be released, for example as part of module unloading. The pool, therefore, can be destroyed. An example is provided, in the form of self-testing. Changes since v20: [http://www.openwall.com/lists/kernel-hardening/2018/03/27/2] * removed the align_order parameter from allocation functions * improved documentation with more explanation * fixed lkdt test * reworked the destroy function, removing a possible race with use-after-free code. Igor Stoppa (6): struct page: add field for vm_struct vmalloc: rename llist field in vmap_area Protectable Memory Pmalloc selftest lkdtm: crash on overwriting protected pmalloc var Documentation for Pmalloc Documentation/core-api/index.rst | 1 + Documentation/core-api/pmalloc.rst | 107 +++++++++++++++ drivers/misc/lkdtm.h | 1 + drivers/misc/lkdtm_core.c | 3 + drivers/misc/lkdtm_perms.c | 25 ++++ include/linux/mm_types.h | 1 + include/linux/pmalloc.h | 166 +++++++++++++++++++++++ include/linux/test_pmalloc.h | 24 ++++ include/linux/vmalloc.h | 5 +- init/main.c | 2 + mm/Kconfig | 16 +++ mm/Makefile | 2 + mm/pmalloc.c | 264 +++++++++++++++++++++++++++++++++++++ mm/test_pmalloc.c | 136 +++++++++++++++++++ mm/usercopy.c | 33 +++++ mm/vmalloc.c | 10 +- 16 files changed, 791 insertions(+), 5 deletions(-) create mode 100644 Documentation/core-api/pmalloc.rst create mode 100644 include/linux/pmalloc.h create mode 100644 include/linux/test_pmalloc.h create mode 100644 mm/pmalloc.c create mode 100644 mm/test_pmalloc.c -- 2.14.1