From patchwork Wed Feb 13 22:41:31 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Igor Stoppa X-Patchwork-Id: 10811005 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 3153B13B4 for ; Wed, 13 Feb 2019 22:42:19 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 217D32E57C for ; Wed, 13 Feb 2019 22:42:19 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 14D0F2E5BF; Wed, 13 Feb 2019 22:42:19 +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=-5.0 required=2.0 tests=BAYES_00,DKIM_ADSP_CUSTOM_MED, DKIM_INVALID,DKIM_SIGNED,FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from mother.openwall.net (mother.openwall.net [195.42.179.200]) by mail.wl.linuxfoundation.org (Postfix) with SMTP id D53042E57C for ; Wed, 13 Feb 2019 22:42:17 +0000 (UTC) Received: (qmail 30378 invoked by uid 550); 13 Feb 2019 22:42:14 -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: Delivered-To: mailing list kernel-hardening@lists.openwall.com Received: (qmail 30305 invoked from network); 13 Feb 2019 22:42:14 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references:reply-to :mime-version:content-transfer-encoding; bh=kjAa+t6wY/NU2SY0EM7WFSE8Fn53OhOBDHc4ci8NYm0=; b=htxDPkLVivpCFTEypIPdGV2Vzcy/7XwcJiFvkwrG1psnxGi0fwBH5MLtVcas4TkNf5 2COfLAp/A9wWDZh7H5gt102tb7USgrH5kt07OADZ62iZ43snyIC276rQR5VrT/1El2/W xjBunUpUkSW+Qh91l934BeWTDHAQcJWiFP/kYDazdDd4vbtSNU+FJAvWw+fLPq7EvfFU Arlb671GTpQ1x/rP/Cvm4uNqUkB4YrSanMLjKsj5w2WO7E0A83BivOFJjTGARHAfpbCF WRHIGFlgf5iu7w8wz8WdPjUo1vptVV3XpP9jWK9oNCS8+VV96xSKRv+x4spertOFgrkH 24iw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:reply-to:mime-version:content-transfer-encoding; bh=kjAa+t6wY/NU2SY0EM7WFSE8Fn53OhOBDHc4ci8NYm0=; b=iLgd83kxhGsoLEjPKlFndPOt1hCRLbnykQQngupEtNkYJVsHe6WWygvUBnKhcpeo+h v0stt2XSItSAq6woODYX7r+f/bOyyxA9LNSUxchwWLOlj6xNMgbEfKOqmx1bDr0dx1ND C222n1VaI7EUB13523mE/9JhaV2s02j8DxAK89XHrbapkV5q1SjC2i5S0ljJaNJYoNV3 lzv2bD5XDbjLzHawTPpgp9a6EM7gsA3szVKUTbfZ+vsQYiiPx5eqiLjkdNgxxCyonspQ Ebu4jjkgxKrpYGFhj+u5iAOQlu6qAMLbW1ygVKE02VTOu8bluLnFJ3mYNuZNc+mwU5KP mQYw== X-Gm-Message-State: AHQUAuZf7qvhmG4C4sYrHHSoQ9CC0G83i9mr2Fv/RKdVb6uRkvQ8/mn7 v8rW5+PdQT0hIeFKPVauEGk= X-Google-Smtp-Source: AHgI3IZj/GseIu78wPoR51yZNgKKZ1+PWmXGjgVTEqwtadfMaSne4o21po7GtJbpbfy7KQjSsZdPYA== X-Received: by 2002:adf:dbc4:: with SMTP id e4mr322496wrj.320.1550097722567; Wed, 13 Feb 2019 14:42:02 -0800 (PST) From: Igor Stoppa X-Google-Original-From: Igor Stoppa To: Cc: Igor Stoppa , Andy Lutomirski , Nadav Amit , Matthew Wilcox , Peter Zijlstra , Kees Cook , Dave Hansen , Mimi Zohar , Thiago Jung Bauermann , Ahmed Soliman , linux-integrity@vger.kernel.org, kernel-hardening@lists.openwall.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH v5 02/12] __wr_after_init: linker section and attribute Date: Thu, 14 Feb 2019 00:41:31 +0200 Message-Id: X-Mailer: git-send-email 2.19.1 In-Reply-To: References: MIME-Version: 1.0 X-Virus-Scanned: ClamAV using ClamSMTP Introduce a linker section and a matching attribute for statically allocated write rare data. The attribute is named "__wr_after_init". After the init phase is completed, this section will be modifiable only by invoking write rare functions. The section occupies a set of full pages, since the granularity available for write protection is of one memory page. The functionality is automatically activated by any architecture that sets CONFIG_ARCH_HAS_PRMEM Signed-off-by: Igor Stoppa CC: Andy Lutomirski CC: Nadav Amit CC: Matthew Wilcox CC: Peter Zijlstra CC: Kees Cook CC: Dave Hansen CC: Mimi Zohar CC: Thiago Jung Bauermann CC: Ahmed Soliman CC: linux-integrity@vger.kernel.org CC: kernel-hardening@lists.openwall.com CC: linux-mm@kvack.org CC: linux-kernel@vger.kernel.org --- arch/Kconfig | 15 +++++++++++++++ include/asm-generic/vmlinux.lds.h | 25 +++++++++++++++++++++++++ include/linux/cache.h | 21 +++++++++++++++++++++ init/main.c | 3 +++ 4 files changed, 64 insertions(+) diff --git a/arch/Kconfig b/arch/Kconfig index 4cfb6de48f79..b0b6d176f1c1 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -808,6 +808,21 @@ config VMAP_STACK the stack to map directly to the KASAN shadow map using a formula that is incorrect if the stack is in vmalloc space. +config ARCH_HAS_PRMEM + def_bool n + help + architecture specific symbol stating that the architecture provides + a back-end function for the write rare operation. + +config PRMEM + bool "Write protect critical data that doesn't need high write speed." + depends on ARCH_HAS_PRMEM + default y + help + If the architecture supports it, statically allocated data which + has been selected for hardening becomes (mostly) read-only. + The selection happens by labelling the data "__wr_after_init". + config ARCH_OPTIONAL_KERNEL_RWX def_bool n diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h index 3d7a6a9c2370..ddb1fd608490 100644 --- a/include/asm-generic/vmlinux.lds.h +++ b/include/asm-generic/vmlinux.lds.h @@ -311,6 +311,30 @@ KEEP(*(__jump_table)) \ __stop___jump_table = .; +/* + * Allow architectures to handle wr_after_init data on their + * own by defining an empty WR_AFTER_INIT_DATA. + * However, it's important that pages containing WR_RARE data do not + * hold anything else, to avoid both accidentally unprotecting something + * that is supposed to stay read-only all the time and also to protect + * something else that is supposed to be writeable all the time. + */ +#ifndef WR_AFTER_INIT_DATA +#ifdef CONFIG_PRMEM +#define WR_AFTER_INIT_DATA(align) \ + . = ALIGN(PAGE_SIZE); \ + __start_wr_after_init = .; \ + . = ALIGN(align); \ + *(.data..wr_after_init) \ + . = ALIGN(PAGE_SIZE); \ + __end_wr_after_init = .; \ + . = ALIGN(align); +#else +#define WR_AFTER_INIT_DATA(align) \ + . = ALIGN(align); +#endif +#endif + /* * Allow architectures to handle ro_after_init data on their * own by defining an empty RO_AFTER_INIT_DATA. @@ -332,6 +356,7 @@ __start_rodata = .; \ *(.rodata) *(.rodata.*) \ RO_AFTER_INIT_DATA /* Read only after init */ \ + WR_AFTER_INIT_DATA(align) /* wr after init */ \ KEEP(*(__vermagic)) /* Kernel version magic */ \ . = ALIGN(8); \ __start___tracepoints_ptrs = .; \ diff --git a/include/linux/cache.h b/include/linux/cache.h index 750621e41d1c..09bd0b9284b6 100644 --- a/include/linux/cache.h +++ b/include/linux/cache.h @@ -31,6 +31,27 @@ #define __ro_after_init __attribute__((__section__(".data..ro_after_init"))) #endif +/* + * __wr_after_init is used to mark objects that cannot be modified + * directly after init (i.e. after mark_rodata_ro() has been called). + * These objects become effectively read-only, from the perspective of + * performing a direct write, like a variable assignment. + * However, they can be altered through a dedicated function. + * It is intended for those objects which are occasionally modified after + * init, however they are modified so seldomly, that the extra cost from + * the indirect modification is either negligible or worth paying, for the + * sake of the protection gained. + */ +#ifndef __wr_after_init +#ifdef CONFIG_PRMEM +#define __wr_after_init \ + __attribute__((__section__(".data..wr_after_init"))) +#else +#define __wr_after_init +#endif +#endif + + #ifndef ____cacheline_aligned #define ____cacheline_aligned __attribute__((__aligned__(SMP_CACHE_BYTES))) #endif diff --git a/init/main.c b/init/main.c index c86a1c8f19f4..965e9fbc5452 100644 --- a/init/main.c +++ b/init/main.c @@ -496,6 +496,8 @@ void __init __weak thread_stack_cache_init(void) void __init __weak mem_encrypt_init(void) { } +void __init __weak wr_init(void) { } + bool initcall_debug; core_param(initcall_debug, initcall_debug, bool, 0644); @@ -713,6 +715,7 @@ asmlinkage __visible void __init start_kernel(void) cred_init(); fork_init(); proc_caches_init(); + wr_init(); uts_ns_init(); buffer_init(); key_init();