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Thu, 22 Oct 2020 17:50:04 +0100 Received: from AcuMS.Aculab.com ([fe80::43c:695e:880f:8750]) by AcuMS.aculab.com ([fe80::43c:695e:880f:8750%12]) with mapi id 15.00.1347.000; Thu, 22 Oct 2020 17:50:04 +0100 From: David Laight To: 'Matthew Wilcox' Subject: RE: Buggy commit tracked to: "Re: [PATCH 2/9] iov_iter: move rw_copy_check_uvector() into lib/iov_iter.c" Thread-Topic: Buggy commit tracked to: "Re: [PATCH 2/9] iov_iter: move rw_copy_check_uvector() into lib/iov_iter.c" Thread-Index: AQHWqE5GNDfnH4y9nkGWtfqJueR1KKmjTCJQgAAN4UiAAAD2IIAAQY5tgAAwVkD///XpAIAAEjsw Date: Thu, 22 Oct 2020 16:50:04 +0000 Message-ID: <089031589f0f43a39f9a5a7737443880@AcuMS.aculab.com> References: <80a2e5fa-718a-8433-1ab0-dd5b3e3b5416@redhat.com> <5d2ecb24db1e415b8ff88261435386ec@AcuMS.aculab.com> <20201022090155.GA1483166@kroah.com> <5fd6003b-55a6-2c3c-9a28-8fd3a575ca78@redhat.com> <20201022132342.GB8781@lst.de> <8f1fff0c358b4b669d51cc80098dbba1@AcuMS.aculab.com> <20201022164040.GV20115@casper.infradead.org> In-Reply-To: <20201022164040.GV20115@casper.infradead.org> Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=C51A453 smtp.mailfrom=david.laight@aculab.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable 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: "linux-aio@kvack.org" , David Hildenbrand , "linux-mips@vger.kernel.org" , David Howells , "linux-mm@kvack.org" , "keyrings@vger.kernel.org" , "sparclinux@vger.kernel.org" , 'Christoph Hellwig' , "linux-arch@vger.kernel.org" , "linux-s390@vger.kernel.org" , "linux-scsi@vger.kernel.org" , "kernel-team@android.com" , Arnd Bergmann , "linux-block@vger.kernel.org" , Al Viro , "io-uring@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , Jens Axboe , "linux-parisc@vger.kernel.org" , Greg KH , Nick Desaulniers , "linux-kernel@vger.kernel.org" , "linux-security-module@vger.kernel.org" , "netdev@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , Andrew Morton , "linuxppc-dev@lists.ozlabs.org" Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Matthew Wilcox > Sent: 22 October 2020 17:41 >=20 > On Thu, Oct 22, 2020 at 04:35:17PM +0000, David Laight wrote: > > Wait... > > readv(2) defines: > > =09ssize_t readv(int fd, const struct iovec *iov, int iovcnt); >=20 > It doesn't really matter what the manpage says. What does the AOSP > libc header say? The only copy I can find is: /usr/include/x86_64-linux-gnu/sys/uio.h:extern ssize_t readv (int __fd, con= st struct iovec *__iovec, int __count) /usr/include/x86_64-linux-gnu/sys/uio.h- __wur; and not surprisingly agrees. POSIX and/or TOG will (more or less) mandate the prototype. > > But the syscall is defined as: > > > > SYSCALL_DEFINE3(readv, unsigned long, fd, const struct iovec __user *, = vec, > > unsigned long, vlen) > > { > > return do_readv(fd, vec, vlen, 0); > > } I wonder when the high bits of 'fd' get zapped? =09David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1= PT, UK Registration No: 1397386 (Wales)