netdev - Re: Buggy commit tracked to: "Re: [PATCH 2/9] iov_iter: move rw_copy_check_uvector() into lib/iov

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Message-ID: <20201023144718.GA2525489@kroah.com>
Date:   Fri, 23 Oct 2020 16:47:18 +0200
From:   'Greg KH' <gregkh@...uxfoundation.org>
To:     David Laight <David.Laight@...lab.com>
Cc:     'David Hildenbrand' <david@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Christoph Hellwig <hch@....de>,
        "kernel-team@...roid.com" <kernel-team@...roid.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Jens Axboe <axboe@...nel.dk>, Arnd Bergmann <arnd@...db.de>,
        David Howells <dhowells@...hat.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        "linux-parisc@...r.kernel.org" <linux-parisc@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>,
        "sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-aio@...ck.org" <linux-aio@...ck.org>,
        "io-uring@...r.kernel.org" <io-uring@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "keyrings@...r.kernel.org" <keyrings@...r.kernel.org>,
        "linux-security-module@...r.kernel.org" 
        <linux-security-module@...r.kernel.org>
Subject: Re: Buggy commit tracked to: "Re: [PATCH 2/9] iov_iter: move
 rw_copy_check_uvector() into lib/iov_iter.c"

On Fri, Oct 23, 2020 at 02:39:24PM +0000, David Laight wrote:
> From: David Hildenbrand
> > Sent: 23 October 2020 15:33
> ...
> > I just checked against upstream code generated by clang 10 and it
> > properly discards the upper 32bit via a mov w23 w2.
> > 
> > So at least clang 10 indeed properly assumes we could have garbage and
> > masks it off.
> > 
> > Maybe the issue is somewhere else, unrelated to nr_pages ... or clang 11
> > behaves differently.
> 
> We'll need the disassembly from a failing kernel image.
> It isn't that big to hand annotate.

I've worked around the merge at the moment in the android tree, but it
is still quite reproducable, and will try to get a .o file to
disassemble on Monday or so...

thanks,

greg k-h