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Tue, 3 Sep 2024 09:05:08 +0000 Received: from AZ-NEU-EX03.Arm.com (10.251.24.31) by AZ-NEU-EX06.Arm.com (10.240.25.134) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Tue, 3 Sep 2024 09:05:07 +0000 Received: from arm.com (10.1.28.157) by mail.arm.com (10.251.24.31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39 via Frontend Transport; Tue, 3 Sep 2024 09:05:06 +0000 Date: Tue, 3 Sep 2024 10:05:05 +0100 From: Yury Khrustalev To: Mark Brown CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: Re: [PATCH v12 23/39] arm64/mm: Implement map_shadow_stack() Message-ID: References: <20240829-arm64-gcs-v12-23-42fec947436a@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20240829-arm64-gcs-v12-23-42fec947436a@kernel.org> X-EOPAttributedMessage: 1 X-MS-TrafficTypeDiagnostic: DU6PEPF0000A7E2:EE_|AM8PR08MB5715:EE_|DU6PEPF0000B61F:EE_|PA4PR08MB7594:EE_ X-MS-Office365-Filtering-Correlation-Id: fb0ac4a0-1e8e-4922-30e4-08dccbf799e8 x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0;ARA:13230040|1800799024|82310400026|376014|7416014|36860700013; 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Instead a new syscall > map_shadow_stack() has been defined which allocates and initialises a > shadow stack page. > > Implement this for arm64. Two flags are provided, allowing applications > to request that the stack be initialised with a valid cap token at the > top of the stack and optionally also an end of stack marker above that. > We support requesting an end of stack marker alone but since this is a > NULL pointer it is indistinguishable from not initialising anything by > itself. > > Reviewed-by: Thiago Jung Bauermann > Reviewed-by: Catalin Marinas > Signed-off-by: Mark Brown Acked-by: Yury Khrustalev