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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 31 May 2024 16:27:59.7921 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b6beb165-317f-4442-d335-08dc818ea2e5 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: DB5PEPF00014B92.eurprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: GV2PR08MB8075 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, linux-mm@kvack.org, hpa@zytor.com, shuah@kernel.org, maz@kernel.org, x86@kernel.org, aneesh.kumar@kernel.org, mingo@redhat.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, Florian Weimer , oliver.upton@linux.dev, aneesh.kumar@linux.ibm.com, 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 05/31/2024 16:21, Joey Gouly wrote: > Hi Szabolcs, > > On Fri, May 31, 2024 at 03:57:07PM +0100, Szabolcs Nagy wrote: > > 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) > > I didn't think about the best way to do that yet. PowerPC has a PKEY_DISABLE_EXECUTE. > > We could either make that generic, and X86 has to error if it sees that bit, or > we add a arch-specific PKEY_DISABLE_EXECUTE like PowerPC. this does not seem to be in glibc yet. (or in linux man pages) i guess you can copy whatever ppc does. > > 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)