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Tue, 22 Aug 2023 15:05:39 +0000 Date: Tue, 22 Aug 2023 16:05:15 +0100 From: Szabolcs Nagy To: Mark Brown , Catalin Marinas , Will Deacon , Jonathan Corbet , Andrew Morton , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Arnd Bergmann , Oleg Nesterov , Eric Biederman , Kees Cook , Shuah Khan , "Rick P. Edgecombe" , Deepak Gupta , Ard Biesheuvel Cc: "H.J. Lu" , Paul Walmsley , Palmer Dabbelt , Albert Ou , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org Subject: Re: [PATCH v5 04/37] arm64/gcs: Document the ABI for Guarded Control Stacks Message-ID: References: <20230822-arm64-gcs-v5-0-9ef181dd6324@kernel.org> <20230822-arm64-gcs-v5-4-9ef181dd6324@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20230822-arm64-gcs-v5-4-9ef181dd6324@kernel.org> X-ClientProxiedBy: SN1PR12CA0070.namprd12.prod.outlook.com (2603:10b6:802:20::41) To DB9PR08MB7179.eurprd08.prod.outlook.com (2603:10a6:10:2cc::19) MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: DB9PR08MB7179:EE_|AM8PR08MB5732:EE_|AM7EUR03FT054:EE_|GV2PR08MB9952:EE_ X-MS-Office365-Filtering-Correlation-Id: d742ba63-49a3-4b73-b061-08dba321457a x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0; 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The 08/22/2023 14:56, Mark Brown wrote: > +3. Allocation of Guarded Control Stacks > +---------------------------------------- ... > +* Stacks allocated using map_shadow_stack() must be larger than 8 bytes and > + must be 8 bytes aligned. "the size must be multiple of 8 bytes." > + > +* An address can be specified to map_shadow_stack(), if one is provided then > + it must be aligned to a page boundary. ... > +5. Signal return > +----------------- ... > + > +7. ptrace extensions > +--------------------- section 6. is missing