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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 17 Jun 2024 14:52:03.3478 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e6bd9875-12ae-4102-05d8-08dc8edd0cf6 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: DB5PEPF00014B9A.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS8PR08MB9147 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: catalin.marinas@arm.com, dave.hansen@linux.intel.com, Joey Gouly , linux-mm@kvack.org, hpa@zytor.com, shuah@kernel.org, maz@kernel.org, x86@kernel.org, christophe.leroy@csgroup.eu, aneesh.kumar@kernel.org, mingo@redhat.com, aneesh.kumar@linux.ibm.com, naveen.n.rao@linux.ibm.com, will@kernel.org, npiggin@gmail.com, broonie@kernel.org, bp@alien8.de, kvmarm@lists.linux.dev, tglx@linutronix.de, linux-arm-kernel@lists.infradead.org, oliver.upton@linux.dev, linux-fsdevel@vger.kernel.org, akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" 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)