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Fri, 31 May 2024 14:57:22 +0000 Date: Fri, 31 May 2024 15:57:07 +0100 From: Szabolcs Nagy To: Joey Gouly , linux-arm-kernel@lists.infradead.org Cc: 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, dave.hansen@linux.intel.com, 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> Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20240503130147.1154804-18-joey.gouly@arm.com> X-ClientProxiedBy: LO4P123CA0165.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:18a::8) To DB9PR08MB7179.eurprd08.prod.outlook.com (2603:10a6:10:2cc::19) Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-TrafficTypeDiagnostic: DB9PR08MB7179:EE_|AS8PR08MB9147:EE_|AM3PEPF00009BA2:EE_|GV1PR08MB8451:EE_ X-MS-Office365-Filtering-Correlation-Id: 543a60be-9d7e-465b-75c2-08dc81820344 x-checkrecipientrouted: true NoDisclaimer: true X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam-Untrusted: BCL:0;ARA:13230031|376005|366007|7416005|1800799015; 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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 31 May 2024 14:57:37.9848 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 543a60be-9d7e-465b-75c2-08dc81820344 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: AM3PEPF00009BA2.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: GV1PR08MB8451 The 05/03/2024 14:01, Joey Gouly wrote: > Implement the PKEYS interface, using the Permission Overlay Extension. ... > +#ifdef CONFIG_ARCH_HAS_PKEYS > +int arch_set_user_pkey_access(struct task_struct *tsk, int pkey, unsigned long init_val) > +{ > + u64 new_por = POE_RXW; > + u64 old_por; > + u64 pkey_shift; > + > + if (!arch_pkeys_enabled()) > + return -ENOSPC; > + > + /* > + * This code should only be called with valid 'pkey' > + * values originating from in-kernel users. Complain > + * if a bad value is observed. > + */ > + if (WARN_ON_ONCE(pkey >= arch_max_pkey())) > + return -EINVAL; > + > + /* Set the bits we need in POR: */ > + if (init_val & PKEY_DISABLE_ACCESS) > + new_por = POE_X; > + else if (init_val & PKEY_DISABLE_WRITE) > + new_por = POE_RX; > + given that the architecture allows r,w,x permissions to be set independently, should we have a 'PKEY_DISABLE_EXEC' or similar api flag? (on other targets it can be some invalid value that fails) > + /* Shift the bits in to the correct place in POR for pkey: */ > + pkey_shift = pkey * POR_BITS_PER_PKEY; > + new_por <<= pkey_shift; > + > + /* Get old POR and mask off any old bits in place: */ > + old_por = read_sysreg_s(SYS_POR_EL0); > + old_por &= ~(POE_MASK << pkey_shift); > + > + /* Write old part along with new part: */ > + write_sysreg_s(old_por | new_por, SYS_POR_EL0); > + > + return 0; > +} > +#endif > -- > 2.25.1 >