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Date: Thu, 22 Oct 2020 19:19:44 +0100
From: Al Viro <viro@zeniv.linux.org.uk>
Subject: Re: Buggy commit tracked to: "Re: [PATCH 2/9] iov_iter: move
 rw_copy_check_uvector() into lib/iov_iter.c"
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To: Matthew Wilcox <willy@infradead.org>
Cc: David Laight <David.Laight@aculab.com>, 'Christoph Hellwig' <hch@lst.de>, David Hildenbrand <david@redhat.com>, Greg KH <gregkh@linuxfoundation.org>, Nick Desaulniers <ndesaulniers@google.com>, "kernel-team@android.com" <kernel-team@android.com>, Andrew Morton <akpm@linux-foundation.org>, Jens Axboe <axboe@kernel.dk>, Arnd Bergmann <arnd@arndb.de>, David Howells <dhowells@redhat.com>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "linux-mips@vger.kernel.org" <linux-mips@vger.kernel.org>, "linux-parisc@vger.kernel.org" <linux-parisc@vger.kernel.org>, "linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>, "linux-s390@vger.kernel.org" <linux-s390@vger.kernel.org>, "sparclinux@vger.kernel.org" <sparclinux@vger.kernel.org>, "linux-block@vger.kernel.org" <linux-block@vger.kernel.org>, "linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>, "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>, "linux-aio@kvack.org" <linux-aio@kvack.org>, "io-uring@vger.kernel.org" <io-uring@vger.kernel.org>, "linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>, "linux-mm@kvack.org" <linux-mm@kvack.org>, "netdev@vger.kernel.org" <netdev@vger.kernel.org>, "keyrings@vger.kernel.org" <keyrings@vger.kernel.org>, "linux-security-module@vger.kernel.org" <linux-security-module@vger.kernel.org>

On Thu, Oct 22, 2020 at 05:40:40PM +0100, Matthew Wilcox wrote:
> On Thu, Oct 22, 2020 at 04:35:17PM +0000, David Laight wrote:
> > Wait...
> > readv(2) defines:
> > 	ssize_t readv(int fd, const struct iovec *iov, int iovcnt);
> 
> It doesn't really matter what the manpage says.  What does the AOSP
> libc header say?

FWIW, see https://www.spinics.net/lists/linux-scsi/msg147836.html and
subthread from there on...