linux-kernel - Re: [PATCH 03/10] exit: Move oops specific logic from do_exit into make_task

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Date:   Mon, 17 Jan 2022 00:05:41 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     "Eric W. Biederman" <ebiederm@...ssion.com>
Cc:     Al Viro <viro@...iv.linux.org.uk>, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Alexey Gladkov <legion@...nel.org>,
        Kyle Huey <me@...ehuey.com>, Oleg Nesterov <oleg@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH 03/10] exit: Move oops specific logic from do_exit into
 make_task_dead

On Fri, Jan 07, 2022 at 12:59:33PM -0600, Eric W. Biederman wrote:
> Assuming it won't be too much longer before the rest of the arches have
> set_fs/get_fs removed it looks like it makes sense to leave the
> force_uaccess_begin where it is, and just let force_uaccess_begin be
> removed when set_fs/get_fs are removed from the tree.
> 
> Christoph does it look like the set_fs/get_fs removal work is going
> to stall indefinitely on some architectures?  If so I think we want to
> find a way to get kernel threads to run with set_fs(USER_DS) on the
> stalled architectures.  Otherwise I think we have a real hazard of
> introducing bugs that will only show up on the stalled architectures.

I really need help from the arch maintainers to finish the set_fs
removal.  There have been very few arch maintainers helping with that
work (arm, arm64, parisc, m68k) in addition to the ones I did because
I have the test setups and knowledge.  I'll send out another ping,
for necrotic architectures like ia64 and sh I have very little hope.