From nobody Sun Sep 14 16:32:19 2025 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 76C42C004D4 for ; Thu, 19 Jan 2023 16:05:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229986AbjASQEt (ORCPT ); Thu, 19 Jan 2023 11:04:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58524 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229712AbjASQEo (ORCPT ); Thu, 19 Jan 2023 11:04:44 -0500 Received: from EUR05-VI1-obe.outbound.protection.outlook.com (mail-vi1eur05on2089.outbound.protection.outlook.com [40.107.21.89]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0BA514ED23 for ; Thu, 19 Jan 2023 08:04:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=armh.onmicrosoft.com; s=selector2-armh-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=BWnBE/PL1egq8JVxHK3Rs1L98loH/NJaLJV0FmvDpbs=; b=tuQI7n/bMvlfnfQesj/RIZsa6OLWxdGJ9NVoYZQDCPz1Cv5HBqnZ7i7PL26q/SUi7ZXFreVvoATBEapBOacwlMW5DPjTaQr/ZNfbB5gNDWvGAmahcVLFpyoBChpKFDd5FFLWhho1/KNJV+3Z+wibfAlSS+hFtTFbRv2Vc95Z+As= Received: from AM6P194CA0011.EURP194.PROD.OUTLOOK.COM (2603:10a6:209:90::24) by GVXPR08MB7679.eurprd08.prod.outlook.com (2603:10a6:150:6f::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6002.12; Thu, 19 Jan 2023 16:04:35 +0000 Received: from AM7EUR03FT058.eop-EUR03.prod.protection.outlook.com (2603:10a6:209:90:cafe::e6) by AM6P194CA0011.outlook.office365.com (2603:10a6:209:90::24) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6002.25 via Frontend Transport; Thu, 19 Jan 2023 16:04:35 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 63.35.35.123) smtp.mailfrom=arm.com; dkim=pass (signature was verified) header.d=armh.onmicrosoft.com;dmarc=pass action=none header.from=arm.com; Received-SPF: Pass (protection.outlook.com: domain of arm.com designates 63.35.35.123 as permitted sender) receiver=protection.outlook.com; client-ip=63.35.35.123; helo=64aa7808-outbound-1.mta.getcheckrecipient.com; pr=C Received: from 64aa7808-outbound-1.mta.getcheckrecipient.com (63.35.35.123) by AM7EUR03FT058.mail.protection.outlook.com (100.127.140.247) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6002.13 via Frontend Transport; Thu, 19 Jan 2023 16:04:34 +0000 Received: ("Tessian outbound 6e565e48ed4a:v132"); Thu, 19 Jan 2023 16:04:34 +0000 X-CheckRecipientChecked: true X-CR-MTA-CID: af47519074e9bf56 X-CR-MTA-TID: 64aa7808 Received: from ec8cb9d0b8ca.1 by 64aa7808-outbound-1.mta.getcheckrecipient.com id A7BB288E-AA90-4770-AE10-D67636400B79.1; Thu, 19 Jan 2023 16:04:04 +0000 Received: from EUR05-AM6-obe.outbound.protection.outlook.com by 64aa7808-outbound-1.mta.getcheckrecipient.com with ESMTPS id ec8cb9d0b8ca.1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384); Thu, 19 Jan 2023 16:04:04 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=HSnFPvfuaDbmy2+AvnEJIXu6h0FuC1yo4+8s2jRRPx0/FXI/QzlpzooiFE58IL0zlDDCPNFS2/ZJEPws4KgTqN1xOm9mA1tPbrzgXFm9mfNjnvx8fFw2oXEejtrpFm9QMnh6YcuWVRSiHI68XZl5am1V6AMAAhwSqIWl8EP5UY2awwPA47g++Ke0hNlkZ/nnH5M6BZiaYIaFjrsU2VLldNj617ZNBFte2crj41QqL5AIFe3qGmUgM0yb4ANXjkt5fgD7GM7Q+oY7nUXw2qJOhZOvtV0KSKl5Fn2pANkIZ5mxpwgXqBBEhMTNCRZEHuVDRJOQlyRbMMwtIwAUcSLKtQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=BWnBE/PL1egq8JVxHK3Rs1L98loH/NJaLJV0FmvDpbs=; b=eM7K4ANkMsi5JRA3qw+bmcjG4XaEewBdIaq11T0UsvVtJpyK1XS4zF7YcyF7SiAeEmI8vcv7yEXyW1gjrbWiH0nd87Z2UIYlHIHrwagZrDOopV0uTvAOBwNi5ssv4j3ZOgYiex0cDGjBh4XeX5FynB4771c8BTrTttbiSI5ZwBmW2XhV2+o9ErsELnuRIABeup+TD64s6qgb9m+a8EDHFV+8M+54tRMUduiMc+kEEj+SqIdvH1BXedQoaZxSk3NKTzXHPGFB+8tcaDRZcUUbfIrHdjoKkADrFSL3rpGr1eb1PovK6y3pxjzL9Ya8qnFIVaJyr+mIDEz1375E0ZleOA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 40.67.248.234) smtp.rcpttodomain=linux-foundation.org smtp.mailfrom=arm.com; dmarc=pass (p=none sp=none pct=100) action=none header.from=arm.com; dkim=none (message not signed); arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=armh.onmicrosoft.com; s=selector2-armh-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=BWnBE/PL1egq8JVxHK3Rs1L98loH/NJaLJV0FmvDpbs=; b=tuQI7n/bMvlfnfQesj/RIZsa6OLWxdGJ9NVoYZQDCPz1Cv5HBqnZ7i7PL26q/SUi7ZXFreVvoATBEapBOacwlMW5DPjTaQr/ZNfbB5gNDWvGAmahcVLFpyoBChpKFDd5FFLWhho1/KNJV+3Z+wibfAlSS+hFtTFbRv2Vc95Z+As= Received: from AS9PR05CA0309.eurprd05.prod.outlook.com (2603:10a6:20b:491::12) by AS8PR08MB9528.eurprd08.prod.outlook.com (2603:10a6:20b:61c::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6002.24; Thu, 19 Jan 2023 16:04:02 +0000 Received: from AM7EUR03FT056.eop-EUR03.prod.protection.outlook.com (2603:10a6:20b:491:cafe::38) by AS9PR05CA0309.outlook.office365.com (2603:10a6:20b:491::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6002.25 via Frontend Transport; Thu, 19 Jan 2023 16:04:02 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 40.67.248.234) smtp.mailfrom=arm.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=arm.com; Received-SPF: Pass (protection.outlook.com: domain of arm.com designates 40.67.248.234 as permitted sender) receiver=protection.outlook.com; client-ip=40.67.248.234; helo=nebula.arm.com; pr=C Received: from nebula.arm.com (40.67.248.234) by AM7EUR03FT056.mail.protection.outlook.com (100.127.140.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.6002.13 via Frontend Transport; Thu, 19 Jan 2023 16:04:02 +0000 Received: from AZ-NEU-EX03.Arm.com (10.251.24.31) by AZ-NEU-EX04.Arm.com (10.251.24.32) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.16; Thu, 19 Jan 2023 16:04:00 +0000 Received: from e124191.cambridge.arm.com (10.1.197.45) by mail.arm.com (10.251.24.31) with Microsoft SMTP Server id 15.1.2507.16 via Frontend Transport; Thu, 19 Jan 2023 16:03:59 +0000 From: Joey Gouly To: Catalin Marinas , Andrew Morton , Lennart Poettering , =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= CC: Alexander Viro , Kees Cook , Szabolcs Nagy , Mark Brown , Jeremy Linton , Topi Miettinen , , , , , , , Subject: [PATCH v2 1/2] mm: Implement memory-deny-write-execute as a prctl Date: Thu, 19 Jan 2023 16:03:43 +0000 Message-ID: <20230119160344.54358-2-joey.gouly@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230119160344.54358-1-joey.gouly@arm.com> References: <20230119160344.54358-1-joey.gouly@arm.com> MIME-Version: 1.0 X-EOPAttributedMessage: 1 X-MS-TrafficTypeDiagnostic: AM7EUR03FT056:EE_|AS8PR08MB9528:EE_|AM7EUR03FT058:EE_|GVXPR08MB7679:EE_ X-MS-Office365-Filtering-Correlation-Id: eff390a5-94b5-4384-56e7-08dafa36dbe9 x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0; X-Microsoft-Antispam-Message-Info-Original: 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 X-Forefront-Antispam-Report-Untrusted: CIP:40.67.248.234;CTRY:IE;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:nebula.arm.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230022)(4636009)(376002)(346002)(396003)(39860400002)(136003)(451199015)(40470700004)(36840700001)(46966006)(41300700001)(4326008)(6666004)(8676002)(8936002)(70206006)(70586007)(2906002)(40460700003)(36756003)(336012)(36860700001)(2616005)(82310400005)(44832011)(5660300002)(7416002)(54906003)(110136005)(316002)(40480700001)(86362001)(7696005)(186003)(478600001)(26005)(1076003)(356005)(81166007)(83380400001)(82740400003)(426003)(47076005)(17423001)(36900700001);DIR:OUT;SFP:1101; X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB9528 X-MS-Exchange-Transport-CrossTenantHeadersStripped: AM7EUR03FT058.eop-EUR03.prod.protection.outlook.com X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id-Prvs: 8b5ae33a-3b4f-454f-2bea-08dafa36c8bf X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:63.35.35.123;CTRY:IE;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:64aa7808-outbound-1.mta.getcheckrecipient.com;PTR:ec2-63-35-35-123.eu-west-1.compute.amazonaws.com;CAT:NONE;SFS:(13230022)(4636009)(136003)(346002)(376002)(396003)(39860400002)(451199015)(46966006)(36840700001)(40470700004)(86362001)(8936002)(83380400001)(47076005)(5660300002)(44832011)(426003)(40480700001)(81166007)(40460700003)(36860700001)(82740400003)(36756003)(82310400005)(2906002)(41300700001)(7696005)(478600001)(26005)(316002)(186003)(54906003)(1076003)(70586007)(2616005)(336012)(4326008)(8676002)(70206006)(6666004)(110136005)(17423001);DIR:OUT;SFP:1101; X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Jan 2023 16:04:34.9933 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: eff390a5-94b5-4384-56e7-08dafa36dbe9 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: AM7EUR03FT058.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: GVXPR08MB7679 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The aim of such policy is to prevent a user task from creating an executable mapping that is also writeable. An example of mmap() returning -EACCESS if the policy is enabled: mmap(0, size, PROT_READ | PROT_WRITE | PROT_EXEC, flags, 0, 0); Similarly, mprotect() would return -EACCESS below: addr =3D mmap(0, size, PROT_READ | PROT_EXEC, flags, 0, 0); mprotect(addr, size, PROT_READ | PROT_WRITE | PROT_EXEC); The BPF filter that systemd MDWE uses is stateless, and disallows mprotect() with PROT_EXEC completely. This new prctl allows PROT_EXEC to be enabled if it was already PROT_EXEC, which allows the following case: addr =3D mmap(0, size, PROT_READ | PROT_EXEC, flags, 0, 0); mprotect(addr, size, PROT_READ | PROT_EXEC | PROT_BTI); where PROT_BTI enables branch tracking identification on arm64. Signed-off-by: Joey Gouly Co-developed-by: Catalin Marinas Signed-off-by: Catalin Marinas Cc: Andrew Morton --- include/linux/mman.h | 34 ++++++++++++++++++++++++++++++++++ include/linux/sched/coredump.h | 6 +++++- include/uapi/linux/prctl.h | 6 ++++++ kernel/sys.c | 33 +++++++++++++++++++++++++++++++++ mm/mmap.c | 10 ++++++++++ mm/mprotect.c | 5 +++++ 6 files changed, 93 insertions(+), 1 deletion(-) diff --git a/include/linux/mman.h b/include/linux/mman.h index 58b3abd457a3..cee1e4b566d8 100644 --- a/include/linux/mman.h +++ b/include/linux/mman.h @@ -156,4 +156,38 @@ calc_vm_flag_bits(unsigned long flags) } =20 unsigned long vm_commit_limit(void); + +/* + * Denies creating a writable executable mapping or gaining executable per= missions. + * + * This denies the following: + * + * a) mmap(PROT_WRITE | PROT_EXEC) + * + * b) mmap(PROT_WRITE) + * mprotect(PROT_EXEC) + * + * c) mmap(PROT_WRITE) + * mprotect(PROT_READ) + * mprotect(PROT_EXEC) + * + * But allows the following: + * + * d) mmap(PROT_READ | PROT_EXEC) + * mmap(PROT_READ | PROT_EXEC | PROT_BTI) + */ +static inline bool map_deny_write_exec(struct vm_area_struct *vma, unsign= ed long vm_flags) +{ + if (!test_bit(MMF_HAS_MDWE, ¤t->mm->flags)) + return false; + + if ((vm_flags & VM_EXEC) && (vm_flags & VM_WRITE)) + return true; + + if (!(vma->vm_flags & VM_EXEC) && (vm_flags & VM_EXEC)) + return true; + + return false; +} + #endif /* _LINUX_MMAN_H */ diff --git a/include/linux/sched/coredump.h b/include/linux/sched/coredump.h index 8270ad7ae14c..0e17ae7fbfd3 100644 --- a/include/linux/sched/coredump.h +++ b/include/linux/sched/coredump.h @@ -81,9 +81,13 @@ static inline int get_dumpable(struct mm_struct *mm) * lifecycle of this mm, just for simplicity. */ #define MMF_HAS_PINNED 27 /* FOLL_PIN has run, never cleared */ + +#define MMF_HAS_MDWE 28 +#define MMF_HAS_MDWE_MASK (1 << MMF_HAS_MDWE) + #define MMF_DISABLE_THP_MASK (1 << MMF_DISABLE_THP) =20 #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK |\ - MMF_DISABLE_THP_MASK) + MMF_DISABLE_THP_MASK | MMF_HAS_MDWE_MASK) =20 #endif /* _LINUX_SCHED_COREDUMP_H */ diff --git a/include/uapi/linux/prctl.h b/include/uapi/linux/prctl.h index a5e06dcbba13..1312a137f7fb 100644 --- a/include/uapi/linux/prctl.h +++ b/include/uapi/linux/prctl.h @@ -281,6 +281,12 @@ struct prctl_mm_map { # define PR_SME_VL_LEN_MASK 0xffff # define PR_SME_VL_INHERIT (1 << 17) /* inherit across exec */ =20 +/* Memory deny write / execute */ +#define PR_SET_MDWE 65 +# define PR_MDWE_REFUSE_EXEC_GAIN 1 + +#define PR_GET_MDWE 66 + #define PR_SET_VMA 0x53564d41 # define PR_SET_VMA_ANON_NAME 0 =20 diff --git a/kernel/sys.c b/kernel/sys.c index 5fd54bf0e886..b3cab94545ed 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -2348,6 +2348,33 @@ static int prctl_set_vma(unsigned long opt, unsigned= long start, } #endif /* CONFIG_ANON_VMA_NAME */ =20 +static inline int prctl_set_mdwe(unsigned long bits, unsigned long arg3, + unsigned long arg4, unsigned long arg5) +{ + if (arg3 || arg4 || arg5) + return -EINVAL; + + if (bits & ~(PR_MDWE_REFUSE_EXEC_GAIN)) + return -EINVAL; + + if (bits & PR_MDWE_REFUSE_EXEC_GAIN) + set_bit(MMF_HAS_MDWE, ¤t->mm->flags); + else if (test_bit(MMF_HAS_MDWE, ¤t->mm->flags)) + return -EPERM; /* Cannot unset the flag */ + + return 0; +} + +static inline int prctl_get_mdwe(unsigned long arg2, unsigned long arg3, + unsigned long arg4, unsigned long arg5) +{ + if (arg2 || arg3 || arg4 || arg5) + return -EINVAL; + + return test_bit(MMF_HAS_MDWE, ¤t->mm->flags) ? + PR_MDWE_REFUSE_EXEC_GAIN : 0; +} + SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, ar= g3, unsigned long, arg4, unsigned long, arg5) { @@ -2623,6 +2650,12 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, a= rg2, unsigned long, arg3, error =3D sched_core_share_pid(arg2, arg3, arg4, arg5); break; #endif + case PR_SET_MDWE: + error =3D prctl_set_mdwe(arg2, arg3, arg4, arg5); + break; + case PR_GET_MDWE: + error =3D prctl_get_mdwe(arg2, arg3, arg4, arg5); + break; case PR_SET_VMA: error =3D prctl_set_vma(arg2, arg3, arg4, arg5); break; diff --git a/mm/mmap.c b/mm/mmap.c index 87d929316d57..99a4d9e2b0d8 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2665,6 +2665,16 @@ unsigned long mmap_region(struct file *file, unsigne= d long addr, vma_set_anonymous(vma); } =20 + if (map_deny_write_exec(vma, vma->vm_flags)) { + error =3D -EACCES; + if (file) + goto close_and_free_vma; + else if (vma->vm_file) + goto unmap_and_free_vma; + else + goto free_vma; + } + /* Allow architectures to sanity-check the vm_flags */ if (!arch_validate_flags(vma->vm_flags)) { error =3D -EINVAL; diff --git a/mm/mprotect.c b/mm/mprotect.c index 908df12caa26..bc0587df042f 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -762,6 +762,11 @@ static int do_mprotect_pkey(unsigned long start, size_= t len, break; } =20 + if (map_deny_write_exec(vma, newflags)) { + error =3D -EACCES; + goto out; + } + /* Allow architectures to sanity-check the new flags */ if (!arch_validate_flags(newflags)) { error =3D -EINVAL; --=20 2.17.1 From nobody Sun Sep 14 16:32:19 2025 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 A6319C004D4 for ; Thu, 19 Jan 2023 16:05:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230380AbjASQFh (ORCPT ); Thu, 19 Jan 2023 11:05:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58654 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230218AbjASQEy (ORCPT ); Thu, 19 Jan 2023 11:04:54 -0500 Received: from EUR05-VI1-obe.outbound.protection.outlook.com (mail-vi1eur05on2069.outbound.protection.outlook.com [40.107.21.69]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 96A8682994 for ; Thu, 19 Jan 2023 08:04:53 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=armh.onmicrosoft.com; s=selector2-armh-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=TVqUovDaP0Eis0yf04LEyuGnbnC1xSyDtOGIyaojtyA=; b=V73VpP7Z56d4ftzhBcoPMGZ9SLcgx2v+yQRa3sVGW8+g+RNr3WXtcxzKfKEopOaf6/fA+oVFIJNkeDcVD8WlzEhCGDQTPC3x2omvjJtzgb1TPbzDurgNIOmdIMzQOHPIJc71uAF/aBhPajxfTksFhirqFMOVcl19qLOdkP2qfWo= Received: from AM7PR04CA0024.eurprd04.prod.outlook.com (2603:10a6:20b:110::34) by GV2PR08MB9304.eurprd08.prod.outlook.com (2603:10a6:150:d4::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6002.24; Thu, 19 Jan 2023 16:04:49 +0000 Received: from AM7EUR03FT043.eop-EUR03.prod.protection.outlook.com (2603:10a6:20b:110:cafe::c6) by AM7PR04CA0024.outlook.office365.com (2603:10a6:20b:110::34) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6002.25 via Frontend Transport; Thu, 19 Jan 2023 16:04:49 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 63.35.35.123) smtp.mailfrom=arm.com; dkim=pass (signature was verified) header.d=armh.onmicrosoft.com;dmarc=pass action=none header.from=arm.com; Received-SPF: Pass (protection.outlook.com: domain of arm.com designates 63.35.35.123 as permitted sender) receiver=protection.outlook.com; client-ip=63.35.35.123; helo=64aa7808-outbound-1.mta.getcheckrecipient.com; pr=C Received: from 64aa7808-outbound-1.mta.getcheckrecipient.com (63.35.35.123) by AM7EUR03FT043.mail.protection.outlook.com (100.127.140.160) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6023.16 via Frontend Transport; Thu, 19 Jan 2023 16:04:49 +0000 Received: ("Tessian outbound 3ad958cd7492:v132"); Thu, 19 Jan 2023 16:04:49 +0000 X-CheckRecipientChecked: true X-CR-MTA-CID: ae1d195896073eb1 X-CR-MTA-TID: 64aa7808 Received: from cb9ffc682106.1 by 64aa7808-outbound-1.mta.getcheckrecipient.com id A654F2B7-F24F-4434-A2CE-8B00202A7FD2.1; Thu, 19 Jan 2023 16:04:06 +0000 Received: from EUR03-DBA-obe.outbound.protection.outlook.com by 64aa7808-outbound-1.mta.getcheckrecipient.com with ESMTPS id cb9ffc682106.1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384); Thu, 19 Jan 2023 16:04:06 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=CBt93A7pn/yhEWmvxLmH/8P+JHctCpPg7sYTkvGXHdiiSbGx1LXFtb/8WcPM7WPpbQzxXfWKB3Pix6TkYws1PmC0WQI2HJmtJ5ecffAPSWnH2cX4Bt0EX2DV1LbiQ6hf0/w0XC6FW/dExrMlB03pYBEs+qFe0ABLCKScmmaBgWYIVIxI2Ip1TUxu3WMDMl1lduIp+5Zil1rPHUNryZWl0kPJHBzSy9SkgaKgXXQGzOHeriFBQOCt7igUd944YUuGd0SzdRmcXuybF+QbybekDdZW43Nqg9qkmFwtj5UPiCyvYOn9f2T3Ctu+D5OalJsOcCp7IUKlZTOKjcQIbGwEUg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=TVqUovDaP0Eis0yf04LEyuGnbnC1xSyDtOGIyaojtyA=; b=lWIpeJ8qhIemmks1v+GMIPZlJ79+SYK0tidfOmXXx8EVUbVkiR7iF5XAvBB3wds/s/CnVUKnO4WVPZdV8rEqSCScdBYDbljIdGsezkPWBwMKyszzzt1cjsRhA8PCxeqwWvCPQvYXQ+sSJDUdp2Vb1sBzfAXkwb6czpElYSkHBXDNtkGBmyO/3tFVTJC44Z3CiOKJVenTJhg7tLGjEUBkYQAxE8djMWyY2EN92LgLR97E8AmNsbL0/KU1XWPTmpirj/aPgHt+rDv9JRYMdz0TJxCS7j2+6bTxniYUMsJ7BY+ivtGLcUw4BhFw0DhTMpaavlT0NEbDLz7CEgPFemnGnA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass (sender ip is 40.67.248.234) smtp.rcpttodomain=linux-foundation.org smtp.mailfrom=arm.com; dmarc=pass (p=none sp=none pct=100) action=none header.from=arm.com; dkim=none (message not signed); arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=armh.onmicrosoft.com; s=selector2-armh-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=TVqUovDaP0Eis0yf04LEyuGnbnC1xSyDtOGIyaojtyA=; b=V73VpP7Z56d4ftzhBcoPMGZ9SLcgx2v+yQRa3sVGW8+g+RNr3WXtcxzKfKEopOaf6/fA+oVFIJNkeDcVD8WlzEhCGDQTPC3x2omvjJtzgb1TPbzDurgNIOmdIMzQOHPIJc71uAF/aBhPajxfTksFhirqFMOVcl19qLOdkP2qfWo= Received: from DU2PR04CA0342.eurprd04.prod.outlook.com (2603:10a6:10:2b4::21) by VI1PR08MB10121.eurprd08.prod.outlook.com (2603:10a6:800:1c4::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6002.25; Thu, 19 Jan 2023 16:04:02 +0000 Received: from DBAEUR03FT022.eop-EUR03.prod.protection.outlook.com (2603:10a6:10:2b4:cafe::90) by DU2PR04CA0342.outlook.office365.com (2603:10a6:10:2b4::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6002.25 via Frontend Transport; Thu, 19 Jan 2023 16:04:02 +0000 X-MS-Exchange-Authentication-Results: spf=pass (sender IP is 40.67.248.234) smtp.mailfrom=arm.com; dkim=none (message not signed) header.d=none;dmarc=pass action=none header.from=arm.com; Received-SPF: Pass (protection.outlook.com: domain of arm.com designates 40.67.248.234 as permitted sender) receiver=protection.outlook.com; client-ip=40.67.248.234; helo=nebula.arm.com; pr=C Received: from nebula.arm.com (40.67.248.234) by DBAEUR03FT022.mail.protection.outlook.com (100.127.142.217) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.6002.13 via Frontend Transport; Thu, 19 Jan 2023 16:04:02 +0000 Received: from AZ-NEU-EX02.Emea.Arm.com (10.251.26.5) by AZ-NEU-EX03.Arm.com (10.251.24.31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.16; Thu, 19 Jan 2023 16:04:01 +0000 Received: from AZ-NEU-EX03.Arm.com (10.251.24.31) by AZ-NEU-EX02.Emea.Arm.com (10.251.26.5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.16; Thu, 19 Jan 2023 16:04:00 +0000 Received: from e124191.cambridge.arm.com (10.1.197.45) by mail.arm.com (10.251.24.31) with Microsoft SMTP Server id 15.1.2507.16 via Frontend Transport; Thu, 19 Jan 2023 16:04:00 +0000 From: Joey Gouly To: Catalin Marinas , Andrew Morton , Lennart Poettering , =?UTF-8?q?Zbigniew=20J=C4=99drzejewski-Szmek?= CC: Alexander Viro , Kees Cook , Szabolcs Nagy , Mark Brown , Jeremy Linton , Topi Miettinen , , , , , , , Subject: [PATCH v2 2/2] kselftest: vm: add tests for memory-deny-write-execute Date: Thu, 19 Jan 2023 16:03:44 +0000 Message-ID: <20230119160344.54358-3-joey.gouly@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230119160344.54358-1-joey.gouly@arm.com> References: <20230119160344.54358-1-joey.gouly@arm.com> MIME-Version: 1.0 X-EOPAttributedMessage: 1 X-MS-TrafficTypeDiagnostic: DBAEUR03FT022:EE_|VI1PR08MB10121:EE_|AM7EUR03FT043:EE_|GV2PR08MB9304:EE_ X-MS-Office365-Filtering-Correlation-Id: 55cec80d-f04a-49ef-5aa3-08dafa36e497 x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0; X-Microsoft-Antispam-Message-Info-Original: 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 X-Forefront-Antispam-Report-Untrusted: CIP:40.67.248.234;CTRY:IE;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:nebula.arm.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230022)(4636009)(396003)(39860400002)(376002)(136003)(346002)(451199015)(40470700004)(46966006)(36840700001)(2906002)(36860700001)(81166007)(82740400003)(40460700003)(426003)(47076005)(40480700001)(82310400005)(36756003)(2616005)(8676002)(316002)(110136005)(7696005)(86362001)(356005)(54906003)(70206006)(7416002)(44832011)(41300700001)(5660300002)(4326008)(70586007)(336012)(1076003)(6666004)(8936002)(26005)(186003)(478600001)(36900700001);DIR:OUT;SFP:1101; X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR08MB10121 X-MS-Exchange-Transport-CrossTenantHeadersStripped: AM7EUR03FT043.eop-EUR03.prod.protection.outlook.com X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id-Prvs: 282693c1-6223-41a5-f24a-08dafa36c854 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:63.35.35.123;CTRY:IE;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:64aa7808-outbound-1.mta.getcheckrecipient.com;PTR:ec2-63-35-35-123.eu-west-1.compute.amazonaws.com;CAT:NONE;SFS:(13230022)(4636009)(136003)(396003)(376002)(39860400002)(346002)(451199015)(40470700004)(36840700001)(46966006)(336012)(82740400003)(426003)(47076005)(44832011)(40460700003)(8936002)(36756003)(36860700001)(41300700001)(316002)(5660300002)(2616005)(40480700001)(4326008)(54906003)(70586007)(8676002)(70206006)(110136005)(2906002)(86362001)(1076003)(82310400005)(186003)(6666004)(26005)(7696005)(81166007)(478600001);DIR:OUT;SFP:1101; X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Jan 2023 16:04:49.5867 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 55cec80d-f04a-49ef-5aa3-08dafa36e497 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[63.35.35.123];Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: AM7EUR03FT043.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: GV2PR08MB9304 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Kees Cook Add some tests to cover the new PR_SET_MDWE prctl. Co-developed-by: Joey Gouly Signed-off-by: Joey Gouly Signed-off-by: Kees Cook Cc: Shuah Khan Acked-by: Joey Gouly --- tools/testing/selftests/vm/Makefile | 1 + tools/testing/selftests/vm/mdwe_test.c | 197 +++++++++++++++++++++++++ 2 files changed, 198 insertions(+) create mode 100644 tools/testing/selftests/vm/mdwe_test.c diff --git a/tools/testing/selftests/vm/Makefile b/tools/testing/selftests/= vm/Makefile index 89c14e41bd43..4e1a7b1d4c52 100644 --- a/tools/testing/selftests/vm/Makefile +++ b/tools/testing/selftests/vm/Makefile @@ -56,6 +56,7 @@ TEST_GEN_PROGS +=3D soft-dirty TEST_GEN_PROGS +=3D split_huge_page_test TEST_GEN_FILES +=3D ksm_tests TEST_GEN_PROGS +=3D ksm_functional_tests +TEST_GEN_PROGS +=3D mdwe_test =20 ifeq ($(MACHINE),x86_64) CAN_BUILD_I386 :=3D $(shell ./../x86/check_cc.sh "$(CC)" ../x86/trivial_32= bit_program.c -m32) diff --git a/tools/testing/selftests/vm/mdwe_test.c b/tools/testing/selftes= ts/vm/mdwe_test.c new file mode 100644 index 000000000000..f466a099f1bf --- /dev/null +++ b/tools/testing/selftests/vm/mdwe_test.c @@ -0,0 +1,197 @@ +// SPDX-License-Identifier: GPL-2.0 + +#ifdef __aarch64__ +#include +#endif + +#include +#include + +#include +#include +#include +#include +#include +#include + +#include "../kselftest_harness.h" + +#ifndef __aarch64__ +# define PROT_BTI 0 +#endif + +TEST(prctl_flags) +{ + EXPECT_LT(prctl(PR_SET_MDWE, 7L, 0L, 0L, 0L), 0); + EXPECT_LT(prctl(PR_SET_MDWE, 0L, 7L, 0L, 0L), 0); + EXPECT_LT(prctl(PR_SET_MDWE, 0L, 0L, 7L, 0L), 0); + EXPECT_LT(prctl(PR_SET_MDWE, 0L, 0L, 0L, 7L), 0); + + EXPECT_LT(prctl(PR_GET_MDWE, 7L, 0L, 0L, 0L), 0); + EXPECT_LT(prctl(PR_GET_MDWE, 0L, 7L, 0L, 0L), 0); + EXPECT_LT(prctl(PR_GET_MDWE, 0L, 0L, 7L, 0L), 0); + EXPECT_LT(prctl(PR_GET_MDWE, 0L, 0L, 0L, 7L), 0); +} + +FIXTURE(mdwe) +{ + void *p; + int flags; + size_t size; + pid_t pid; +}; + +FIXTURE_VARIANT(mdwe) +{ + bool enabled; + bool forked; +}; + +FIXTURE_VARIANT_ADD(mdwe, stock) +{ + .enabled =3D false, + .forked =3D false, +}; + +FIXTURE_VARIANT_ADD(mdwe, enabled) +{ + .enabled =3D true, + .forked =3D false, +}; + +FIXTURE_VARIANT_ADD(mdwe, forked) +{ + .enabled =3D true, + .forked =3D true, +}; + +FIXTURE_SETUP(mdwe) +{ + int ret, status; + + self->p =3D NULL; + self->flags =3D MAP_SHARED | MAP_ANONYMOUS; + self->size =3D getpagesize(); + + if (!variant->enabled) + return; + + ret =3D prctl(PR_SET_MDWE, PR_MDWE_REFUSE_EXEC_GAIN, 0L, 0L, 0L); + ASSERT_EQ(ret, 0) { + TH_LOG("PR_SET_MDWE failed or unsupported"); + } + + ret =3D prctl(PR_GET_MDWE, 0L, 0L, 0L, 0L); + ASSERT_EQ(ret, 1); + + if (variant->forked) { + self->pid =3D fork(); + ASSERT_GE(self->pid, 0) { + TH_LOG("fork failed\n"); + } + + if (self->pid > 0) { + ret =3D waitpid(self->pid, &status, 0); + ASSERT_TRUE(WIFEXITED(status)); + exit(WEXITSTATUS(status)); + } + } +} + +FIXTURE_TEARDOWN(mdwe) +{ + if (self->p && self->p !=3D MAP_FAILED) + munmap(self->p, self->size); +} + +TEST_F(mdwe, mmap_READ_EXEC) +{ + self->p =3D mmap(NULL, self->size, PROT_READ | PROT_EXEC, self->flags, 0,= 0); + EXPECT_NE(self->p, MAP_FAILED); +} + +TEST_F(mdwe, mmap_WRITE_EXEC) +{ + self->p =3D mmap(NULL, self->size, PROT_WRITE | PROT_EXEC, self->flags, 0= , 0); + if (variant->enabled) { + EXPECT_EQ(self->p, MAP_FAILED); + } else { + EXPECT_NE(self->p, MAP_FAILED); + } +} + +TEST_F(mdwe, mprotect_stay_EXEC) +{ + int ret; + + self->p =3D mmap(NULL, self->size, PROT_READ | PROT_EXEC, self->flags, 0,= 0); + ASSERT_NE(self->p, MAP_FAILED); + + ret =3D mprotect(self->p, self->size, PROT_READ | PROT_EXEC); + EXPECT_EQ(ret, 0); +} + +TEST_F(mdwe, mprotect_add_EXEC) +{ + int ret; + + self->p =3D mmap(NULL, self->size, PROT_READ, self->flags, 0, 0); + ASSERT_NE(self->p, MAP_FAILED); + + ret =3D mprotect(self->p, self->size, PROT_READ | PROT_EXEC); + if (variant->enabled) { + EXPECT_LT(ret, 0); + } else { + EXPECT_EQ(ret, 0); + } +} + +TEST_F(mdwe, mprotect_WRITE_EXEC) +{ + int ret; + + self->p =3D mmap(NULL, self->size, PROT_WRITE, self->flags, 0, 0); + ASSERT_NE(self->p, MAP_FAILED); + + ret =3D mprotect(self->p, self->size, PROT_WRITE | PROT_EXEC); + if (variant->enabled) { + EXPECT_LT(ret, 0); + } else { + EXPECT_EQ(ret, 0); + } +} + +TEST_F(mdwe, mmap_FIXED) +{ + void *p, *p2; + + p2 =3D mmap(NULL, self->size, PROT_READ | PROT_EXEC, self->flags, 0, 0); + self->p =3D mmap(NULL, self->size, PROT_READ, self->flags, 0, 0); + ASSERT_NE(self->p, MAP_FAILED); + + p =3D mmap(self->p + self->size, self->size, PROT_READ | PROT_EXEC, + self->flags | MAP_FIXED, 0, 0); + if (variant->enabled) { + EXPECT_EQ(p, MAP_FAILED); + } else { + EXPECT_EQ(p, self->p); + } +} + +TEST_F(mdwe, arm64_BTI) +{ + int ret; + +#ifdef __aarch64__ + if (!(getauxval(AT_HWCAP2) & HWCAP2_BTI)) +#endif + SKIP(return, "HWCAP2_BTI not supported"); + + self->p =3D mmap(NULL, self->size, PROT_EXEC, self->flags, 0, 0); + ASSERT_NE(self->p, MAP_FAILED); + + ret =3D mprotect(self->p, self->size, PROT_EXEC | PROT_BTI); + EXPECT_EQ(ret, 0); +} + +TEST_HARNESS_MAIN --=20 2.17.1