linux-kernel - Re: WARNING in __kernel

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Date:   Fri, 10 Jul 2020 09:55:39 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     syzbot <syzbot+e6f77e16ff68b2434a2c@...kaller.appspotmail.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, viro@...iv.linux.org.uk
Subject: Re: WARNING in __kernel_write

On Thu, Jul 09, 2020 at 04:54:19PM -0700, syzbot wrote:
> Hello,
> 
> syzbot found the following crash on:

9p fails to validate the fds passed in, triggering the new WARN_ON_ONCE
added in __kernel_write.  Mostly harmless as only the warning is new,
but I'll send a patch to better validate the fds at mount time.