From patchwork Wed Oct 26 15:04:56 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joey Gouly X-Patchwork-Id: 13020746 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id E4257C38A2D for ; Wed, 26 Oct 2022 15:09:00 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 7F7268E0002; Wed, 26 Oct 2022 11:09:00 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 77FAC8E0001; Wed, 26 Oct 2022 11:09:00 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5D2BD8E0002; Wed, 26 Oct 2022 11:09:00 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id 4578E8E0001 for ; Wed, 26 Oct 2022 11:09:00 -0400 (EDT) Received: from smtpin23.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay03.hostedemail.com (Postfix) with ESMTP id EA94BA04F5 for ; Wed, 26 Oct 2022 15:08:59 +0000 (UTC) X-FDA: 80063433198.23.A3B8A95 Received: from EUR01-VE1-obe.outbound.protection.outlook.com (mail-eopbgr140089.outbound.protection.outlook.com [40.107.14.89]) by imf29.hostedemail.com (Postfix) with ESMTP id 5F727120050 for ; Wed, 26 Oct 2022 15:08:57 +0000 (UTC) ARC-Seal: i=2; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=pass; b=CwFoQSQcuOJAl+CVblwS2/X3Qvg45U7pnno0smw0KZX8UWUx04Dxq9tClkiQQzEh7eCvlgQFFPcTQ5/NhrHACcwqwI2d6aifEJ1ebsn0fDox8X9B0IIZje5NpvRYTA/Z4iMyj6vW2MRpgNRJX5Ty2XpyajYTL78nBSazcNnUfD3y7MFvcsOJ/CQZrGRnJnDpyLJheiYM7DUi/b9KJcJGBxoPXaw1FeYtX0G24VFodlXC8fb52ul5H2ivHJImd7+eM2jPNTgyJMAfVq3RbeZ8b8OwJ8OMjC7JwKbHjHw+CqxR9fOozB+wDFDf0+DCpk0OaHmW0pdZUhx8UpK5Rh3+/A== ARC-Message-Signature: i=2; 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=HYfPwbM8XKUTWEb22ZoeQws90ygepA223xQAlZWfh0I=; b=B87RkYaZnp8WuL08pCNUkAh/NISMhBsz2IV8EkrD8Hp4UIWX/FZNKHdKkdYzb2JSY0pK9yJD6ubOLfBVhM9BzJNmo/3tcUO5Rth1nrU7hzimw7PV9FGgyud9cXfy9cbYOMKxBcN2f9TiVmoU8oytNW6lowihsG1/1/uyOS5mG2bU961+w54YjqO9G404FDdlNApSsSDc5Osw30W7egj6BszabeiR5Ch6is56wE8buYfwKsFMsbmSV6bUeNfxLYQrI7JwN0oHm1ywcwYX9EGcXCufFneq7YIDYZSQssB1kVzZqRsdGHEPTQWZ4oIMFL7lmX2fSd00x7KolriP+Mv1sg== ARC-Authentication-Results: i=2; mx.microsoft.com 1; spf=pass (sender ip is 63.35.35.123) smtp.rcpttodomain=kvack.org smtp.mailfrom=arm.com; dmarc=pass (p=none sp=none pct=100) action=none header.from=arm.com; dkim=pass (signature was verified) header.d=armh.onmicrosoft.com; arc=pass (0 oda=1 ltdi=1 spf=[1,1,smtp.mailfrom=arm.com] dmarc=[1,1,header.from=arm.com]) 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=HYfPwbM8XKUTWEb22ZoeQws90ygepA223xQAlZWfh0I=; b=8vo6DjhPrEOP8p9q+0Ex6MPJ8zr6mwpU2U787IEXFRtLqahPjgbyMomEbXbNdz8qPTxmOQasKbb9l/hmPs8Y1q6o3o+IIn4qpMeJpA6w9DGoUD+J3/nkIJUgFG6fgK48PgYlurKHOLHIDP4coKVWTYGT9//74CO8fbbTY7IxEcY= Received: from FR0P281CA0074.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:1e::20) by AS8PR08MB10269.eurprd08.prod.outlook.com (2603:10a6:20b:63c::15) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5746.23; Wed, 26 Oct 2022 15:08:41 +0000 Received: from VI1EUR03FT055.eop-EUR03.prod.protection.outlook.com (2603:10a6:d10:1e:cafe::a2) by FR0P281CA0074.outlook.office365.com (2603:10a6:d10:1e::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5769.13 via Frontend Transport; Wed, 26 Oct 2022 15:08:41 +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 VI1EUR03FT055.mail.protection.outlook.com (100.127.144.130) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5746.19 via Frontend Transport; Wed, 26 Oct 2022 15:08:40 +0000 Received: ("Tessian outbound 58faf9791229:v130"); Wed, 26 Oct 2022 15:08:39 +0000 X-CheckRecipientChecked: true X-CR-MTA-CID: 3c1f7f1f4a1c5bad X-CR-MTA-TID: 64aa7808 Received: from 503de7c18d26.1 by 64aa7808-outbound-1.mta.getcheckrecipient.com id DD19D9F3-A868-4ACE-8C01-F4F83DCAD6FD.1; Wed, 26 Oct 2022 15:05:28 +0000 Received: from EUR03-DBA-obe.outbound.protection.outlook.com by 64aa7808-outbound-1.mta.getcheckrecipient.com with ESMTPS id 503de7c18d26.1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384); Wed, 26 Oct 2022 15:05:27 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=iuvYlbolZrzter9locKaKlk5HWuddnzWAreNvF3uFVQvpNCp6oDwdBmjkFYcmoUk0f77cgz3Lp23AG45Uvw0evRK5HkSkBpOzFFfXOpgLj6wb1s3JDhrRo9gZNt0AakozRKujoKHuQlQBkub13dDdjOe7BQSA7Gy2rPNCQPzTvr9fZBTzqPyVFr45V4L9cqTriq0hw80B5oJZW22i7tlAlMajHUGlBSzCGCnmxZsa5K4hyk2FdSRRO0Qf9tFw3tUVAoMge20Jmk+fkojTHv81Oc8KJL5jirWtg4jybUS44/Iy8TooV0hijpQfdZIJMk6c3hi0qSqwwixxTc5DyOJ1A== 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=HYfPwbM8XKUTWEb22ZoeQws90ygepA223xQAlZWfh0I=; b=XvayGapnsyXJV+qahfdyV0cLAPnP4q67AxvY3QGK+2sN5w1w7FEAZ435DQV2iWuaqVvQx/NTqd9s2YH+/iwBSuj2KMwP9YLjiUZusuTbXRpatoNnz+HhjuSTAcRy5iaOkbSb82U52mBO9zU+vJsjlwM5acSUW/0Dv+zOKssp0PRysp0q327pm0+rcU7u22XkVyqiERhUf50rRHwlOqKHNFPVdOmrlrV2uwOBo4egK3ELUNrNwxs3MhxJVNF/0LQiiThI69XCB5AQJjpz16d0FBt9bqUKBut8UkXvuFwF4/BkQ/iPPKzlcA7jHjs9f7EK2yc4xyK8PSqj6VU3MZQzJQ== 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=HYfPwbM8XKUTWEb22ZoeQws90ygepA223xQAlZWfh0I=; b=8vo6DjhPrEOP8p9q+0Ex6MPJ8zr6mwpU2U787IEXFRtLqahPjgbyMomEbXbNdz8qPTxmOQasKbb9l/hmPs8Y1q6o3o+IIn4qpMeJpA6w9DGoUD+J3/nkIJUgFG6fgK48PgYlurKHOLHIDP4coKVWTYGT9//74CO8fbbTY7IxEcY= Received: from DB6PR0601CA0020.eurprd06.prod.outlook.com (2603:10a6:4:7b::30) by AM9PR08MB6692.eurprd08.prod.outlook.com (2603:10a6:20b:30c::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5746.28; Wed, 26 Oct 2022 15:05:19 +0000 Received: from DBAEUR03FT057.eop-EUR03.prod.protection.outlook.com (2603:10a6:4:7b:cafe::57) by DB6PR0601CA0020.outlook.office365.com (2603:10a6:4:7b::30) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5746.27 via Frontend Transport; Wed, 26 Oct 2022 15:05:17 +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 DBAEUR03FT057.mail.protection.outlook.com (100.127.142.182) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.5709.10 via Frontend Transport; Wed, 26 Oct 2022 15:05:17 +0000 Received: from AZ-NEU-EX03.Arm.com (10.251.24.31) 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 15.1.2507.12; Wed, 26 Oct 2022 15:05:15 +0000 Received: from e124191.cambridge.arm.com (10.1.197.45) by mail.arm.com (10.251.24.31) with Microsoft SMTP Server id 15.1.2507.12 via Frontend Transport; Wed, 26 Oct 2022 15:05:15 +0000 From: Joey Gouly To: Catalin Marinas , Andrew Morton , Lennart Poettering , =?utf-8?q?Zbigniew_J=C4=99drze?= =?utf-8?q?jewski-Szmek?= CC: Alexander Viro , Kees Cook , Szabolcs Nagy , Mark Brown , Jeremy Linton , Topi Miettinen , , , , , , , Subject: [PATCH v1 1/2] mm: Implement memory-deny-write-execute as a prctl Date: Wed, 26 Oct 2022 16:04:56 +0100 Message-ID: <20221026150457.36957-2-joey.gouly@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20221026150457.36957-1-joey.gouly@arm.com> References: <20221026150457.36957-1-joey.gouly@arm.com> MIME-Version: 1.0 X-EOPAttributedMessage: 1 X-MS-TrafficTypeDiagnostic: DBAEUR03FT057:EE_|AM9PR08MB6692:EE_|VI1EUR03FT055:EE_|AS8PR08MB10269:EE_ X-MS-Office365-Filtering-Correlation-Id: b91ef1ea-5c64-4a4e-921b-08dab763f722 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)(346002)(376002)(136003)(396003)(39860400002)(451199015)(40470700004)(46966006)(36840700001)(36756003)(86362001)(356005)(81166007)(82740400003)(44832011)(40460700003)(40480700001)(2906002)(2616005)(6666004)(36860700001)(83380400001)(7696005)(1076003)(26005)(336012)(478600001)(47076005)(186003)(110136005)(54906003)(426003)(82310400005)(41300700001)(316002)(70206006)(4326008)(8676002)(7416002)(5660300002)(8936002)(70586007)(17423001)(36900700001);DIR:OUT;SFP:1101; X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM9PR08MB6692 X-MS-Exchange-Transport-CrossTenantHeadersStripped: VI1EUR03FT055.eop-EUR03.prod.protection.outlook.com X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id-Prvs: 84b34e25-0825-4a8f-ca1c-08dab7637e26 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)(39860400002)(346002)(376002)(396003)(136003)(451199015)(46966006)(36840700001)(40470700004)(70206006)(7696005)(70586007)(4326008)(8676002)(44832011)(81166007)(2616005)(5660300002)(478600001)(36860700001)(110136005)(82310400005)(54906003)(86362001)(336012)(36756003)(40480700001)(41300700001)(8936002)(26005)(186003)(47076005)(2906002)(426003)(1076003)(40460700003)(82740400003)(6666004)(316002)(107886003)(83380400001)(17423001);DIR:OUT;SFP:1101; X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Oct 2022 15:08:40.0979 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b91ef1ea-5c64-4a4e-921b-08dab763f722 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: VI1EUR03FT055.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB10269 ARC-Message-Signature: i=3; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1666796938; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=HYfPwbM8XKUTWEb22ZoeQws90ygepA223xQAlZWfh0I=; b=mLpgYggRyYJS3Z4Ri0Ufpjfda74BgvbALiKaUg3U7GNZY0ivCYccgdo8vn4DAyFqUBr+lS B79ZyAizPeGCEUhRiaqGui75SV4Cj4oaXl4PmvmT4mOhf4/NwUze6kdo2Bx+gsWQU4Wy0H WFrY/NTR/jOBRZedHP3NjzJ8C7Pqz1Y= ARC-Authentication-Results: i=3; imf29.hostedemail.com; dkim=pass header.d=armh.onmicrosoft.com header.s=selector2-armh-onmicrosoft-com header.b=8vo6DjhP; dkim=pass header.d=armh.onmicrosoft.com header.s=selector2-armh-onmicrosoft-com header.b=8vo6DjhP; arc=pass ("microsoft.com:s=arcselector9901:i=2"); spf=pass (imf29.hostedemail.com: domain of Joey.Gouly@arm.com designates 40.107.14.89 as permitted sender) smtp.mailfrom=Joey.Gouly@arm.com; dmarc=pass (policy=none) header.from=arm.com ARC-Seal: i=3; s=arc-20220608; d=hostedemail.com; t=1666796938; a=rsa-sha256; cv=pass; b=qL4GdmxYZ4GEW7SYHsfTyrlPKJ8nY+UmpC9kU1Fp92VjOl8IGFJrt3poGMH99jEsSX+c7s AoNRfTfNqQa9e5q4NjQzhOwz0Z7o8yFZckCDT54MXCVmQZGbtgWQ+/hzmstTJXn8swYrrF y9iHOPK7P5WlDmqL1TvuB6NOYRnOX8A= Authentication-Results: imf29.hostedemail.com; dkim=pass header.d=armh.onmicrosoft.com header.s=selector2-armh-onmicrosoft-com header.b=8vo6DjhP; dkim=pass header.d=armh.onmicrosoft.com header.s=selector2-armh-onmicrosoft-com header.b=8vo6DjhP; arc=pass ("microsoft.com:s=arcselector9901:i=2"); spf=pass (imf29.hostedemail.com: domain of Joey.Gouly@arm.com designates 40.107.14.89 as permitted sender) smtp.mailfrom=Joey.Gouly@arm.com; dmarc=pass (policy=none) header.from=arm.com X-Stat-Signature: u4dd4mcjwjucddz34ni8moxgmnehuxja X-Rspamd-Queue-Id: 5F727120050 X-Rspamd-Server: rspam07 X-Rspam-User: X-HE-Tag: 1666796937-193225 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: 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 = 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 = 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 | 15 +++++++++++++++ include/linux/sched/coredump.h | 6 +++++- include/uapi/linux/prctl.h | 6 ++++++ kernel/sys.c | 18 ++++++++++++++++++ mm/mmap.c | 3 +++ mm/mprotect.c | 5 +++++ 6 files changed, 52 insertions(+), 1 deletion(-) diff --git a/include/linux/mman.h b/include/linux/mman.h index 58b3abd457a3..d84fdeab6b5e 100644 --- a/include/linux/mman.h +++ b/include/linux/mman.h @@ -156,4 +156,19 @@ calc_vm_flag_bits(unsigned long flags) } unsigned long vm_commit_limit(void); + +static inline bool map_deny_write_exec(struct vm_area_struct *vma, unsigned 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 && !(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) #define MMF_INIT_MASK (MMF_DUMPABLE_MASK | MMF_DUMP_FILTER_MASK |\ - MMF_DISABLE_THP_MASK) + MMF_DISABLE_THP_MASK | MMF_HAS_MDWE_MASK) #endif /* _LINUX_SCHED_COREDUMP_H */ diff --git a/include/uapi/linux/prctl.h b/include/uapi/linux/prctl.h index a5e06dcbba13..ab9db1e86230 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 */ +/* Memory deny write / execute */ +#define PR_SET_MDWE 65 +# define PR_MDWE_FLAG_MMAP 1 + +#define PR_GET_MDWE 66 + #define PR_SET_VMA 0x53564d41 # define PR_SET_VMA_ANON_NAME 0 diff --git a/kernel/sys.c b/kernel/sys.c index 5fd54bf0e886..08e1dd6d2533 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -2348,6 +2348,18 @@ static int prctl_set_vma(unsigned long opt, unsigned long start, } #endif /* CONFIG_ANON_VMA_NAME */ +static inline int prctl_set_mdwe(void) +{ + set_bit(MMF_HAS_MDWE, ¤t->mm->flags); + + return 0; +} + +static inline int prctl_get_mdwe(void) +{ + return test_bit(MMF_HAS_MDWE, ¤t->mm->flags); +} + SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, unsigned long, arg4, unsigned long, arg5) { @@ -2623,6 +2635,12 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3, error = sched_core_share_pid(arg2, arg3, arg4, arg5); break; #endif + case PR_SET_MDWE: + error = prctl_set_mdwe(); + break; + case PR_GET_MDWE: + error = prctl_get_mdwe(); + break; case PR_SET_VMA: error = prctl_set_vma(arg2, arg3, arg4, arg5); break; diff --git a/mm/mmap.c b/mm/mmap.c index 099468aee4d8..42eaf6683216 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1409,6 +1409,9 @@ unsigned long do_mmap(struct file *file, unsigned long addr, vm_flags |= VM_NORESERVE; } + if (map_deny_write_exec(NULL, vm_flags)) + return -EACCES; + addr = mmap_region(file, addr, len, vm_flags, pgoff, uf); if (!IS_ERR_VALUE(addr) && ((vm_flags & VM_LOCKED) || diff --git a/mm/mprotect.c b/mm/mprotect.c index 8d770855b591..af71ef0788fd 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -766,6 +766,11 @@ static int do_mprotect_pkey(unsigned long start, size_t len, break; } + if (map_deny_write_exec(vma, newflags)) { + error = -EACCES; + goto out; + } + /* Allow architectures to sanity-check the new flags */ if (!arch_validate_flags(newflags)) { error = -EINVAL; From patchwork Wed Oct 26 15:04:57 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Joey Gouly X-Patchwork-Id: 13020745 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id E50A2FA3741 for ; Wed, 26 Oct 2022 15:08:39 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 511C88E0003; Wed, 26 Oct 2022 11:08:39 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 4C19E8E0001; Wed, 26 Oct 2022 11:08:39 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 29F328E0003; Wed, 26 Oct 2022 11:08:39 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id 152468E0001 for ; Wed, 26 Oct 2022 11:08:39 -0400 (EDT) Received: from smtpin27.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id DAE631C6A3B for ; Wed, 26 Oct 2022 15:08:38 +0000 (UTC) X-FDA: 80063432316.27.674BED2 Received: from EUR05-AM6-obe.outbound.protection.outlook.com (mail-am6eur05on2078.outbound.protection.outlook.com [40.107.22.78]) by imf05.hostedemail.com (Postfix) with ESMTP id 5C8B710003E for ; Wed, 26 Oct 2022 15:08:38 +0000 (UTC) ARC-Seal: i=2; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=pass; b=Kq2+WNBzWnirTXT1GYhcKlwu3363K9m4sT1zp3ktlq01tHw+24oTtNjizp7yqvvSmLWkFTFB9Phw74TVKfRz/1cVGOoZEqAwDRp7j43H0XP7B69onL6cklnkXmSqvCWwgzsWFF1aD0Xuln+Ni+LRZS3GUS1A9fKcnlioUPE2V/JxbCpKuQ2/V0aWrQ0I8oBj92pdZLTKSr+7Llhg+xW7YK0v26aCofRulQnbyFOQNcdleBp0Q6yLkJIUX+krdBBM7hRqqKbE/CTa28APHsMZOc5c8UZOBp0Z5jTgUW1ixbDK8yD1Rlb2WWor61o8bl0VYQObe+hKUF6x9d7rA9XqlQ== ARC-Message-Signature: i=2; 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=Md2eIw/qYyLb6WObHWIWKkMCdMsgVJSwb+YL6Upe9Nw=; b=FMzGEPMb+Q825QfwshVnhk3l+e7Ao6C6IJASG3vrpmtGd4464JYj1ymnNMY5eE50YkuWqE9PEZ40HxeT2NXJkRBgAEU9RUH8KNlD4gonG6c20ZVuRz0w21DwtUIu8fiSy+6xi8orAki5ywSPtv9Mbe1ReNzWmQtXq50EXsENNpk577c5HwAURk3F20ReX6MMshMRX8ox0hmxOmYm2Ltj54pHedLgMuHa1NZqVmyB2JhAzLixGi/OEBXN24wINbhiF6nGtBJKbjCw+J8fZ8Pgc4po7ydnz5Vg+DAbstb/G+kqvMRJGwycoqa4cUSXXh/X5GKCI57Rz2CLe/0yq/qKDQ== ARC-Authentication-Results: i=2; mx.microsoft.com 1; spf=pass (sender ip is 63.35.35.123) smtp.rcpttodomain=kvack.org smtp.mailfrom=arm.com; dmarc=pass (p=none sp=none pct=100) action=none header.from=arm.com; dkim=pass (signature was verified) header.d=armh.onmicrosoft.com; arc=pass (0 oda=1 ltdi=1 spf=[1,1,smtp.mailfrom=arm.com] dmarc=[1,1,header.from=arm.com]) 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=Md2eIw/qYyLb6WObHWIWKkMCdMsgVJSwb+YL6Upe9Nw=; b=gmO25wVav1/taN5Db1F/nBf1QL4tpJUiaOaPxD/0idMSd0YDbd3bB8pptW63IRr9TmThEjPOg+7+F/WuLZPbw5NyJWzWON/GVMinv8kM7dmnqApCzSkfwNnzWWZZ4hIRYGsSOgpMzvFsly4hXOofPvmBF3moV9zTAEAa8/moU9g= Received: from DU2PR04CA0231.eurprd04.prod.outlook.com (2603:10a6:10:2b1::26) by AS2PR08MB9986.eurprd08.prod.outlook.com (2603:10a6:20b:649::5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5746.21; Wed, 26 Oct 2022 15:08:35 +0000 Received: from DBAEUR03FT037.eop-EUR03.prod.protection.outlook.com (2603:10a6:10:2b1:cafe::8) by DU2PR04CA0231.outlook.office365.com (2603:10a6:10:2b1::26) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5746.21 via Frontend Transport; Wed, 26 Oct 2022 15:08:35 +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 DBAEUR03FT037.mail.protection.outlook.com (100.127.142.208) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5746.19 via Frontend Transport; Wed, 26 Oct 2022 15:08:34 +0000 Received: ("Tessian outbound 2ff13c8f2c05:v130"); Wed, 26 Oct 2022 15:08:34 +0000 X-CheckRecipientChecked: true X-CR-MTA-CID: b53391cd8ab55964 X-CR-MTA-TID: 64aa7808 Received: from cbae66d2aa36.1 by 64aa7808-outbound-1.mta.getcheckrecipient.com id B8046C14-437F-41FF-8087-0946A0586D4C.1; Wed, 26 Oct 2022 15:05:22 +0000 Received: from EUR01-DB5-obe.outbound.protection.outlook.com by 64aa7808-outbound-1.mta.getcheckrecipient.com with ESMTPS id cbae66d2aa36.1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384); Wed, 26 Oct 2022 15:05:22 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=ZkX9V87TVMr6BEvHgsJ7bMISzqAtEQBdCxCP1BRKLY5FRfL/fLcdbUzACSwaMV8X4rn9FRJu/zfAgskCHs7JcUa6gaBcMa0OdCpFVmWpRx5zusMCy0HG+DhcTZDIg6aIX/LZ/5CZindckNuxaZFTfXIFk6DwFsay2axLp0hU+8oDPeajMWSTkOVCfe7kc9OvbkeexIw3v8aiALwlcQVkiw5aZvGHVqfEBbTygDfr+7NMizHvBbFoAjeaa0TozWY0znqzTaVOjgHoGGOss4CsXwogqDrxN4OeQdjcMpbkghUPU6RS6F7X+5Yo4/F+fBmwNqpjJvTOHPj1lJjEi8acuA== 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=Md2eIw/qYyLb6WObHWIWKkMCdMsgVJSwb+YL6Upe9Nw=; b=fmw5/kMPoZb9v+vG9Ed+S5AYvRzQsE6Dsmm1EogIwR8r2WDEymazlwsoY4apwd8MPixWW1TJrh1Oorh3Jpn3ZQ9JTl1Nwx8MLiZh3ttd98a00N5psJMi77BnbQdzEb/ZooORcq1+YTFWc59MDOLyh3oCuk11KRtEqwFjQu7B2yLf0QRypIHg/NneRXEO3FdDCFJe3njkmF+psQfXjwSefVtVV2Zp5LtZKB7W3xf9PikCdyVZWjNJTqTa1JrnMJuXDdSorXbhJzpMyqnAhRPgdHqJDOkN7XIrXOxmykA75bjD5rFdEL/AdjcgQVR6WzDiulQnX8CgQeh8Vg9qnZSbsg== 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=Md2eIw/qYyLb6WObHWIWKkMCdMsgVJSwb+YL6Upe9Nw=; b=gmO25wVav1/taN5Db1F/nBf1QL4tpJUiaOaPxD/0idMSd0YDbd3bB8pptW63IRr9TmThEjPOg+7+F/WuLZPbw5NyJWzWON/GVMinv8kM7dmnqApCzSkfwNnzWWZZ4hIRYGsSOgpMzvFsly4hXOofPvmBF3moV9zTAEAa8/moU9g= Received: from DB6PR0601CA0002.eurprd06.prod.outlook.com (2603:10a6:4:7b::12) by AS8PR08MB6552.eurprd08.prod.outlook.com (2603:10a6:20b:31c::8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5746.28; Wed, 26 Oct 2022 15:05:19 +0000 Received: from DBAEUR03FT057.eop-EUR03.prod.protection.outlook.com (2603:10a6:4:7b:cafe::91) by DB6PR0601CA0002.outlook.office365.com (2603:10a6:4:7b::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5746.23 via Frontend Transport; Wed, 26 Oct 2022 15:05:19 +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 DBAEUR03FT057.mail.protection.outlook.com (100.127.142.182) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.5709.10 via Frontend Transport; Wed, 26 Oct 2022 15:05:19 +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 15.1.2507.12; Wed, 26 Oct 2022 15:05:16 +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 15.1.2507.12; Wed, 26 Oct 2022 15:05:16 +0000 Received: from e124191.cambridge.arm.com (10.1.197.45) by mail.arm.com (10.251.24.31) with Microsoft SMTP Server id 15.1.2507.12 via Frontend Transport; Wed, 26 Oct 2022 15:05:15 +0000 From: Joey Gouly To: Catalin Marinas , Andrew Morton , Lennart Poettering , =?utf-8?q?Zbigniew_J=C4=99drze?= =?utf-8?q?jewski-Szmek?= CC: Alexander Viro , Kees Cook , Szabolcs Nagy , Mark Brown , Jeremy Linton , Topi Miettinen , , , , , , , Subject: [PATCH v1 2/2] kselftest: vm: add tests for memory-deny-write-execute Date: Wed, 26 Oct 2022 16:04:57 +0100 Message-ID: <20221026150457.36957-3-joey.gouly@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20221026150457.36957-1-joey.gouly@arm.com> References: <20221026150457.36957-1-joey.gouly@arm.com> MIME-Version: 1.0 X-EOPAttributedMessage: 1 X-MS-TrafficTypeDiagnostic: DBAEUR03FT057:EE_|AS8PR08MB6552:EE_|DBAEUR03FT037:EE_|AS2PR08MB9986:EE_ X-MS-Office365-Filtering-Correlation-Id: 5c8b007c-d4c3-4391-caf1-08dab763f3b8 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)(39860400002)(136003)(376002)(396003)(346002)(451199015)(36840700001)(46966006)(40470700004)(82740400003)(36860700001)(86362001)(81166007)(356005)(110136005)(54906003)(316002)(40480700001)(83380400001)(47076005)(70586007)(2906002)(70206006)(5660300002)(478600001)(8936002)(8676002)(44832011)(426003)(41300700001)(4326008)(7416002)(186003)(6666004)(336012)(1076003)(7696005)(40460700003)(2616005)(26005)(82310400005)(36756003)(36900700001);DIR:OUT;SFP:1101; X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB6552 X-MS-Exchange-Transport-CrossTenantHeadersStripped: DBAEUR03FT037.eop-EUR03.prod.protection.outlook.com X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id-Prvs: bb267f41-e2a6-415a-b2af-08dab7637f9a 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)(376002)(346002)(396003)(39860400002)(451199015)(36840700001)(46966006)(40470700004)(5660300002)(110136005)(8936002)(316002)(54906003)(70206006)(4326008)(8676002)(6666004)(107886003)(7696005)(26005)(70586007)(41300700001)(82310400005)(36756003)(40480700001)(81166007)(36860700001)(82740400003)(1076003)(2616005)(186003)(336012)(2906002)(44832011)(40460700003)(426003)(47076005)(86362001)(83380400001)(478600001);DIR:OUT;SFP:1101; X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Oct 2022 15:08:34.4965 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5c8b007c-d4c3-4391-caf1-08dab763f3b8 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: DBAEUR03FT037.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS2PR08MB9986 ARC-Message-Signature: i=3; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1666796918; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=Md2eIw/qYyLb6WObHWIWKkMCdMsgVJSwb+YL6Upe9Nw=; b=QcDljWTRYgQ2YlsXNBnHCh7z2bTfpjYwHZAGebg0gCGxPru6PzLhqFfbFt7AkDagaAWyUb e/MpGEcR5lnW75bA/tyVvRgYHSk0R4gsDrU/T9x37tg7v73jKH7R2tuGIUcxv0c/CCwYMz 2bi4cJEeeYM6pvcmwqXvlKwhndEmpDo= ARC-Authentication-Results: i=3; imf05.hostedemail.com; dkim=pass header.d=armh.onmicrosoft.com header.s=selector2-armh-onmicrosoft-com header.b=gmO25wVa; dkim=pass header.d=armh.onmicrosoft.com header.s=selector2-armh-onmicrosoft-com header.b=gmO25wVa; dmarc=pass (policy=none) header.from=arm.com; arc=pass ("microsoft.com:s=arcselector9901:i=2"); spf=pass (imf05.hostedemail.com: domain of Joey.Gouly@arm.com designates 40.107.22.78 as permitted sender) smtp.mailfrom=Joey.Gouly@arm.com ARC-Seal: i=3; s=arc-20220608; d=hostedemail.com; t=1666796918; a=rsa-sha256; cv=pass; b=zFRMi257xGFtKWEEYpFjyFU4GenwS9Sx9bNFCxYS0De5xwey6O45plmJG4Q27GKYRRbRNZ w+vU3YWmJqDkNOYA9+RE5iJdwG6xVxhs7Kd0xC0skYUhTwUukTF5jzY8mCQqBbJTZTQ0sx zBE3YH3dyp76+VwRTtbLplD5uCRQOqo= X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 5C8B710003E X-Rspam-User: Authentication-Results: imf05.hostedemail.com; dkim=pass header.d=armh.onmicrosoft.com header.s=selector2-armh-onmicrosoft-com header.b=gmO25wVa; dkim=pass header.d=armh.onmicrosoft.com header.s=selector2-armh-onmicrosoft-com header.b=gmO25wVa; dmarc=pass (policy=none) header.from=arm.com; arc=pass ("microsoft.com:s=arcselector9901:i=2"); spf=pass (imf05.hostedemail.com: domain of Joey.Gouly@arm.com designates 40.107.22.78 as permitted sender) smtp.mailfrom=Joey.Gouly@arm.com X-Stat-Signature: fps7utfqwho57pfh4w689uiqp1o43a56 X-HE-Tag: 1666796918-539571 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: Add some tests to cover the new PR_SET_MDWE prctl. Signed-off-by: Joey Gouly Cc: Shuah Khan Reviewed-by: Mark Brown Signed-off-by: Joey Gouly Signed-off-by: Kees Cook --- tools/testing/selftests/vm/mdwe_test.c | 194 +++++++++++++++++++++++++ 1 file changed, 194 insertions(+) create mode 100644 tools/testing/selftests/vm/mdwe_test.c diff --git a/tools/testing/selftests/vm/mdwe_test.c b/tools/testing/selftests/vm/mdwe_test.c new file mode 100644 index 000000000000..67f3fc06d069 --- /dev/null +++ b/tools/testing/selftests/vm/mdwe_test.c @@ -0,0 +1,194 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#include "../kselftest.h" + +#define PR_SET_MDWE 65 +# define PR_MDWE_FLAG_MMAP 1 + +#define PR_GET_MDWE 66 + +#ifdef __aarch64__ +#define PROT_BTI 0x10 /* BTI guarded page */ +#endif + +#define TEST1 "mmap(PROT_WRITE | PROT_EXEC)\n" +#define TEST2 "mmap(PROT_WRITE); mprotect(PROT_EXEC)\n" +#define TEST3 "mmap(PROT_EXEC); mprotect(PROT_EXEC | PROT_READ)\n" +#define TEST4 "mmap(PROT_EXEC); mprotect(PROT_EXEC | PROT_BTI)\n" + +int fork_test(int (*func)(int)) +{ + pid_t pid; + int status; + + pid = fork(); + if (pid < 0) { + printf("fork failed\n"); + return KSFT_FAIL; + } + + if (pid == 0) + exit(func(1)); + + waitpid(pid, &status, 0); + + if (WIFEXITED(status)) + return WEXITSTATUS(status); + + return 0; +} + +static inline void test_result(int err, const char *msg) +{ + switch (err) { + case KSFT_PASS: + ksft_test_result_pass(msg); + break; + case KSFT_FAIL: + ksft_test_result_fail(msg); + break; + case KSFT_SKIP: + ksft_test_result_skip(msg); + break; + default: + ksft_test_result_error("Unknown return code %d from %s", + err, msg); + break; + } +} + +int test1(int mdwe_enabled) +{ + void *p; + + int size = getpagesize(); + int mmap_flags = MAP_SHARED | MAP_ANONYMOUS; + + p = mmap(0, size, PROT_WRITE | PROT_EXEC, mmap_flags, 0, 0); + + if (mdwe_enabled) + return p == MAP_FAILED ? KSFT_PASS : KSFT_FAIL; + else + return p != MAP_FAILED ? KSFT_PASS : KSFT_FAIL; +} + +int test2(int mdwe_enabled) +{ + void *p; + int ret; + + int size = getpagesize(); + int mmap_flags = MAP_SHARED | MAP_ANONYMOUS; + + p = mmap(0, size, PROT_WRITE, mmap_flags, 0, 0); + if (p == MAP_FAILED) + return 0; + ret = mprotect(p, size, PROT_EXEC); + + if (mdwe_enabled) + return ret < 0 ? KSFT_PASS : KSFT_FAIL; + else + return ret == 0 ? KSFT_PASS : KSFT_FAIL; +} + +int test3(int mdwe_enabled) +{ + void *p; + int ret; + + int size = getpagesize(); + int mmap_flags = MAP_SHARED | MAP_ANONYMOUS; + + p = mmap(0, size, PROT_EXEC, mmap_flags, 0, 0); + if (p == MAP_FAILED) + return 0; + + ret = mprotect(p, size, PROT_EXEC | PROT_READ); + + return ret == 0 ? KSFT_PASS : KSFT_FAIL; +} + +#ifdef __aarch64__ +int test4(int mdwe_enabled) +{ + void *p; + int ret; + + int size = getpagesize(); + int mmap_flags = MAP_SHARED | MAP_ANONYMOUS; + + if (!(getauxval(AT_HWCAP2) & HWCAP2_BTI)) + return KSFT_SKIP; + + p = mmap(0, size, PROT_EXEC, mmap_flags, 0, 0); + if (p == MAP_FAILED) + return KSFT_FAIL; + + ret = mprotect(p, size, PROT_EXEC | PROT_BTI); + + return ret == 0 ? KSFT_PASS : KSFT_FAIL; +} +#endif + +int main(void) +{ + int ret; + + ksft_print_header(); +#ifdef __aarch64__ + ksft_set_plan(12); +#else + ksft_set_plan(9); +#endif + + // First run the tests without MDWE + test_result(test1(0), TEST1); + test_result(test2(0), TEST2); + test_result(test3(0), TEST3); +#ifdef __aarch64__ + test_result(test4(0), TEST4); +#endif + + // Enable MDWE and then run the tests again. + ret = prctl(PR_SET_MDWE, PR_MDWE_FLAG_MMAP, 0, 0, 0); + if (ret < 0) { + ksft_print_msg("PR_SET_MDWE failed or unsupported!\n"); + goto exit; + } + + ret = prctl(PR_GET_MDWE, PR_MDWE_FLAG_MMAP, 0, 0, 0); + if (ret == 0) + ksft_exit_fail_msg("PR_GET_MDWE failed!"); + + test_result(test1(1), "MDWE: " TEST1); + test_result(test2(1), "MDWE: " TEST2); + test_result(test3(1), "MDWE: " TEST3); +#ifdef __aarch64__ + test_result(test4(1), "MDWE: " TEST4); +#endif + + // Verify the MDWE setting is transferred when fork()ing + test_result(fork_test(test1), "MDWE+fork: " TEST1); + test_result(fork_test(test2), "MDWE+fork: " TEST2); + test_result(fork_test(test3), "MDWE+fork: " TEST3); +#ifdef __aarch64__ + test_result(fork_test(test4), "MDWE+fork: " TEST4); +#endif + +exit: + ksft_finished(); + + return 0; +} +