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Lu" CC: Szabolcs Nagy , "H.J. Lu via Libc-alpha" Subject: Re: [PATCH] aarch64: MTE compatible strchrnul Thread-Topic: [PATCH] aarch64: MTE compatible strchrnul Thread-Index: AQHWOYt1Dk4juZqwAEeuNzUEnoVvnqjG9qgAgAAWzwaAAVAEgIAAhhp0gADB6YCAAA5bWw== Date: Fri, 5 Jun 2020 08:45:33 +0000 Message-ID: References: <0bcd0114-8547-2d2c-8b14-c2bc459a72c0@linaro.org> <87367cw334.fsf@arm.com> <20200604194837.GA673948@port70.net> , <20200605073823.GM21536@arm.com> In-Reply-To: <20200605073823.GM21536@arm.com> Accept-Language: en-GB, en-US Content-Language: en-GB X-MS-Has-Attach: X-MS-TNEF-Correlator: Authentication-Results-Original: arm.com; dkim=none (message not signed) header.d=none;arm.com; dmarc=none action=none header.from=arm.com; x-originating-ip: [82.24.199.97] x-ms-publictraffictype: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: 9906e73b-27ab-4f33-5a61-08d8092cd465 x-ms-traffictypediagnostic: DB8PR08MB5210:|AM0PR08MB4113: x-ms-exchange-transport-forked: True X-Microsoft-Antispam-PRVS: x-checkrecipientrouted: true nodisclaimer: true x-ms-oob-tlc-oobclassifiers: OLM:8882;OLM:8882; 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Ip=[63.35.35.123]; Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0PR08MB4113 X-Spam-Status: No, score=-0.4 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, RCVD_IN_BARRACUDACENTRAL, RCVD_IN_DNSWL_LOW, RCVD_IN_MSPIKE_H2, SPF_HELO_PASS, SPF_PASS, TXREP, UNPARSEABLE_RELAY autolearn=no autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 05 Jun 2020 08:45:45 -0000 Hi,=0A= =0A= >> Should we add a marker to indicate that an object file is=0A= >> mte compatible?=0A= >=0A= > i think we will need a marking for 'compatible with tagged=0A= > pointers' (on aarch64 pointer that's a new opt-in kernel abi=0A= > and user code may use the top byte of pointers) and another=0A= > one for 'compatible with 16byte granules'.=0A= >=0A= > e.g. the old string asm would have the first marking but not=0A= > the second one.=0A= =0A= I don't see how adding different markings would help. String functions=0A= which are not MTE compatible simply cannot be used if MTE is enabled,=0A= and if they are not fixed or ifunced then all of GLIBC is not compatible=0A= with MTE.=0A= =0A= Compatibility is a dynamic property, ie. an incompatible string function is= =0A= perfectly fine if it is ifunced. So having various different markings is no= t useful.=0A= Either way all of this is unrelated to these patches.=0A= =0A= Cheers,=0A= Wilco=