linux-kernel - 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: <80332728fbc3438f806aee74003e26c1@AcuMS.aculab.com>
Date:   Thu, 22 Oct 2020 16:15:05 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Greg KH' <gregkh@...uxfoundation.org>,
        Arnd Bergmann <arnd@...db.de>
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>,
        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"

From: Greg KH
> Sent: 22 October 2020 15:40
> 
> On Thu, Oct 22, 2020 at 04:28:20PM +0200, Arnd Bergmann wrote:
...
> > Can you attach the iov_iter.s files from the broken build, plus the
> > one with 'noinline' for comparison? Maybe something can be seen
> > in there.
> 
> I don't know how to extract the .s files easily from the AOSP build
> system, I'll look into that.  I'm also now testing by downgrading to an
> older version of clang (10 instead of 11), to see if that matters at all
> or not...

Back from a day out - after it stopped raining.
Trying to use up leave before the end of the year.

Can you use objdump on the kernel binary itself and cut out
the single function?

	David

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