linux-kernel - Re: general protection fault in tomoyo_socket_sendmsg

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Date:   Thu, 11 Feb 2021 18:34:14 -0700
From:   Shuah Khan <skhan@...uxfoundation.org>
To:     Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Hillf Danton <hdanton@...a.com>,
        syzbot <syzbot+95ce4b142579611ef0a9@...kaller.appspotmail.com>
Cc:     linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Valentina Manea <valentina.manea.m@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        syzkaller-bugs@...glegroups.com,
        Shuah Khan <skhan@...uxfoundation.org>
Subject: Re: general protection fault in tomoyo_socket_sendmsg_permission

On 2/10/21 6:14 PM, Tetsuo Handa wrote:
> (Dropping LSM ML because this is not a TOMOYO's bug.)
> 
> On 2021/02/11 4:29, Shuah Khan wrote:
>> This is a good find. I already replied to the thread to send a complete
>> fix.
> 
> As I said at https://lkml.kernel.org/r/f8cae6b1-8f84-0e6a-7d9c-fc4aec68f07b@i-love.sakura.ne.jp ,
> the as-is patch is effectively a complete fix. And applying the as-is patch should help spending
> syzbot resources for reproducing "general protection fault in tomoyo_socket_sendmsg_permission"
> with debug printk() patch applied, which in turn will help you in
> 
>> Right. I would like to get a clear understanding of how this condition
>> is triggered. I am not saying this isn't a problem. Understanding how
>> it is triggered helps find the best fix.
> 
> part. Therefore, I strongly expect you to apply this version now.
> 

Is there a reproducer for this problem?

thanks,
-- Shuah