linux-kernel - Re: general protection fault in tomoyo_socket_sendmsg

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Date:   Sat, 13 Feb 2021 11:10:03 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:     Shuah Khan <skhan@...uxfoundation.org>,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Valentina Manea <valentina.manea.m@...il.com>,
        syzkaller-bugs@...glegroups.com, Hillf Danton <hdanton@...a.com>,
        syzbot <syzbot+95ce4b142579611ef0a9@...kaller.appspotmail.com>
Subject: Re: general protection fault in tomoyo_socket_sendmsg_permission

On Sat, Feb 13, 2021 at 07:02:22PM +0900, Tetsuo Handa wrote:
> Greg, will you queue https://lkml.kernel.org/r/20210205135707.4574-1-penguin-kernel@I-love.SAKURA.ne.jp (which can
> close a report which is wasting syzbot's resource with 5300+ crashes) for 5.12 ? The change shown below will be
> too large to test before merge window for 5.12 opens. 
> 
> The patch for fixing "general protection fault in tomoyo_socket_sendmsg_permission" will kill kthread_get_run().
> Closing frequently crashing bug now is the better.
> 
> On 2021/02/11 22:40, Tetsuo Handa wrote:
> > I guess that we need to serialize attach operation and reset/detach operations, for
> > it seems there is a race window that might result in "general protection fault in
> > tomoyo_socket_sendmsg_permission". Details follows...
> 
> Here is untested diff that is expected to be complete.

Please work and test this and get it merged in a normal manner, there is
no "rush" here at all.  Submit it properly and all will be fine.

thanks,

greg k-h