From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Laight Date: Fri, 18 Feb 2022 09:30:32 +0000 Subject: RE: [PATCH v2 13/18] uaccess: generalize access_ok() Message-Id: <93a1ee797e9d4f789dff85a3c0f0c232@AcuMS.aculab.com> List-Id: References: <20220216131332.1489939-1-arnd@kernel.org> <20220216131332.1489939-14-arnd@kernel.org> In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: 'Andy Lutomirski' , Arnd Bergmann Cc: Linus Torvalds , Christoph Hellwig , "linux-arch@vger.kernel.org" , "linux-mm@kvack.org" , "linux-api@vger.kernel.org" , "arnd@arndb.de" , "linux-kernel@vger.kernel.org" , "viro@zeniv.linux.org.uk" , "linux@armlinux.org.uk" , "will@kernel.org" , "guoren@kernel.org" , "bcain@codeaurora.org" , "geert@linux-m68k.org" , "monstr@monstr.eu" , "tsbogend@alpha.franken.de" , "nickhu@andestech.com" , "green.hu@gmail.com" , "dinguyen@kernel.org" , "shorne@gmail.com" , "deller@gmx.de" , "mpe@ellerman.id.au" , "peterz@infradead.org" , "mingo@redhat.com" , "mark.rutland@arm.com" , "hca@linux.ibm.com" , "dalias@libc.org" , "davem@davemloft.net" , "richard@nod.at" , "x86@kernel.org" , "jcmvbkbc@gmail.com" , "ebiederm@xmission.com" , "akpm@linux-foundation.org" , "ardb@kernel.org" , "linux-alpha@vger.kernel.org" , "linux-snps-arc@lists.infradead.org" , "linux-csky@vger.kernel.org" , "linux-hexagon@vger.kernel.org" , "linux-ia64@vger.kernel.org" , "linux-m68k@lists.linux-m68k.org" , "linux-mips@vger.kernel.org" , "openrisc@lists.librecores.org" , "linux-parisc@vger.kernel.org" , "linuxppc-dev@lists.ozlabs.org" , "linux-riscv@lists.infradead.org" , "linux-s390@vger.kernel.org" , "linux-sh@vger.kernel.org" , "sparclinux@vger.kernel.org" , "linux-um@lists.infradead.org" , "linux-xtensa@linux-xtensa.org" RnJvbTogQW5keSBMdXRvbWlyc2tpDQo+IFNlbnQ6IDE3IEZlYnJ1YXJ5IDIwMjIgMTk6MTUNCi4u Lg0KPiBUaGlzIGlzbid0IGFjdHVhbGx5IG9wdGltYWwuICBPbiB4ODYsIFRBU0tfU0laRV9NQVgg aXMgYSBiaXphcnJlDQo+IGNvbnN0YW50IHRoYXQgaGFzIGEgdmVyeSBzcGVjaWZpYyB2YWx1ZSB0 byB3b3JrIGFyb3VuZCBhIGJ1Z15XZGVzaWduDQo+IGVycm9yXldmZWF0dXJlIG9mIEludGVsIENQ VXMuICBUQVNLX1NJWkVfTUFYIGlzIHRoZSBtYXhpbXVtIGFkZHJlc3MgYXQNCj4gd2hpY2ggdXNl cnNwYWNlIGlzIHBlcm1pdHRlZCB0byBhbGxvY2F0ZSBtZW1vcnksIGJ1dCB0aGVyZSBpcyBhIGh1 Z2UNCj4gZ2FwIGJldHdlZW4gdXNlciBhbmQga2VybmVsIGFkZHJlc3NlcywgYW5kIGFueSB2YWx1 ZSBpbiB0aGUgZ2FwIHdvdWxkDQo+IGJlIGFkZXF1YXRlIGZvciB0aGUgY29tcGFyaXNvbi4gIElm IHdlIHdhbnRlZCB0byBvcHRpbWl6ZSB0aGlzLCBzaW1wbHkNCj4gY2hlY2tpbmcgdGhlIGhpZ2gg Yml0ICh3aGljaCB4ODYgY2FuIGRvIHdpdGhvdXQgYW55IGltbWVkaWF0ZQ0KPiBjb25zdGFudHMg YXQgYWxsKSB3b3VsZCBiZSBzdWZmaWNpZW50IGFuZCwgZm9yIGFuIGFjY2VzcyBrbm93biB0byBm aXQNCj4gaW4gMzIgYml0cywgb25lIGNvdWxkIGdldCBldmVuIGZhbmNpZXIgYW5kIGNvbXBsZXRl bHkgaWdub3JlIHRoZSBzaXplDQo+IG9mIHRoZSBhY2Nlc3MuICAoRm9yIGFjY2Vzc2VzIG5vdCBr bm93biB0byBmaXQgaW4gMzIgYml0cywgSSBzdXNwZWN0DQo+IHNvbWUgY3JlYXRpdml0eSBjb3Vs ZCBzdGlsbCBjb21lIHVwIHdpdGggYSBjb25zdHJ1Y3Rpb24gdGhhdCdzDQo+IHN1YnN0YW50aWFs bHkgZmFzdGVyIHRoYW4gdGhlIG9uZSBpbiB5b3VyIHBhdGNoLikNCj4gDQo+IFNvIHRoZXJlJ3Mg cGxlbnR5IG9mIHJvb20gZm9yIG9wdGltaXphdGlvbiBoZXJlLg0KPiANCj4gKFRoaXMgaXMgbm90 IGluIGFueSByZXNwZWN0IGEgTkFLIC0tIGl0J3MganVzdCBhbiBvYnNlcnZhdGlvbiB0aGF0DQo+ IHRoaXMgY291bGQgYmUgZXZlbiBiZXR0ZXIuKQ0KDQpGb3IgNjRiaXQgYXJjaCB0aGF0IHVzZSB0 aGUgdG9wIGJpdCB0byBzZXBhcmF0ZSB1c2VyL2tlcm5lbA0KeW91IGNhbiB0ZXN0ICcoYWRkciB8 IHNpemUpID4+IDYyKScuDQpUaGUgY29tcGlsZXIgb3B0aW1pc2VzIG91dCBjb25zdGFudCBzaXpl cy4NCg0KVGhpcyBoYXMgYWxsIGJlZW4gbWVudGlvbmVkIGEgbG90IG9mIHRpbWVzLg0KWW91IGRv IGdldCBkaWZmZXJlbnQgZmF1bHQgdHlwZXMuDQoNCk9UT0ggYW4gZXhwbGljaXQgY2hlY2sgZm9y IGNvbnN0YW50IHNpemUgKGxlc3MgdGhhbiBzb21ldGhpbmcgYmlnKQ0KY2FuIHVzZSB0aGUgY2hl YXBlciB0ZXN0IG9mIHRoZSBzaWduIGJpdC4NCkJpZyBjb25zdGFudCBzaXplcyBjb3VsZCBiZSBj b21waWxlIHRpbWUgZXJyb3JzLg0KDQoJRGF2aWQNCg0KLQ0KUmVnaXN0ZXJlZCBBZGRyZXNzIExh a2VzaWRlLCBCcmFtbGV5IFJvYWQsIE1vdW50IEZhcm0sIE1pbHRvbiBLZXluZXMsIE1LMSAxUFQs IFVLDQpSZWdpc3RyYXRpb24gTm86IDEzOTczODYgKFdhbGVzKQ0K