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Mon, 17 Jun 2024 14:51:49 +0000 Date: Mon, 17 Jun 2024 15:51:35 +0100 From: Szabolcs Nagy To: Florian Weimer Cc: Joey Gouly , dave.hansen@linux.intel.com, linux-arm-kernel@lists.infradead.org, akpm@linux-foundation.org, aneesh.kumar@kernel.org, aneesh.kumar@linux.ibm.com, bp@alien8.de, broonie@kernel.org, catalin.marinas@arm.com, christophe.leroy@csgroup.eu, hpa@zytor.com, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, maz@kernel.org, mingo@redhat.com, mpe@ellerman.id.au, naveen.n.rao@linux.ibm.com, npiggin@gmail.com, oliver.upton@linux.dev, shuah@kernel.org, tglx@linutronix.de, will@kernel.org, x86@kernel.org, kvmarm@lists.linux.dev Subject: Re: [PATCH v4 17/29] arm64: implement PKEYS support Message-ID: References: <20240503130147.1154804-1-joey.gouly@arm.com> <20240503130147.1154804-18-joey.gouly@arm.com> <20240531152138.GA1805682@e124191.cambridge.arm.com> <87a5jj4rhw.fsf@oldenburg.str.redhat.com> Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <87a5jj4rhw.fsf@oldenburg.str.redhat.com> X-ClientProxiedBy: LO4P123CA0670.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:351::16) To DB9PR08MB7179.eurprd08.prod.outlook.com (2603:10a6:10:2cc::19) MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: DB9PR08MB7179:EE_|DB9PR08MB9516:EE_|AMS1EPF00000046:EE_|DU5PR08MB10612:EE_ X-MS-Office365-Filtering-Correlation-Id: 80da80b7-21da-4c57-7a2b-08dc8edd0d06 x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0;ARA:13230037|7416011|376011|1800799021|366013; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Jun 2024 14:52:03.6744 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 80da80b7-21da-4c57-7a2b-08dc8edd0d06 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: AMS1EPF00000046.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DU5PR08MB10612 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240617_080812_604695_79F23AC0 X-CRM114-Status: GOOD ( 14.62 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The 06/17/2024 15:40, Florian Weimer wrote: > >> A user can still set it by interacting with the register directly, but I guess > >> we want something for the glibc interface.. > >> > >> Dave, any thoughts here? > > > > adding Florian too, since i found an old thread of his that tried > > to add separate PKEY_DISABLE_READ and PKEY_DISABLE_EXECUTE, but > > it did not seem to end up upstream. (this makes more sense to me > > as libc api than the weird disable access semantics) > > I still think it makes sense to have a full complenent of PKEY_* flags > complementing the PROT_* flags, in a somewhat abstract fashion for > pkey_alloc only. The internal protection mask register encoding will > differ from architecture to architecture, but the abstract glibc > functions pkey_set and pkey_get could use them (if we are a bit > careful). to me it makes sense to have abstract PKEY_DISABLE_READ PKEY_DISABLE_WRITE PKEY_DISABLE_EXECUTE PKEY_DISABLE_ACCESS where access is handled like if (flags&PKEY_DISABLE_ACCESS) flags |= PKEY_DISABLE_READ|PKEY_DISABLE_WRITE; disable_read = flags&PKEY_DISABLE_READ; disable_write = flags&PKEY_DISABLE_WRITE; disable_exec = flags&PKEY_DISABLE_EXECUTE; if there are unsupported combinations like disable_read&&!disable_write then those are rejected by pkey_alloc and pkey_set. this allows portable use of pkey apis. (the flags could be target specific, but don't have to be)