Re: general protection fault in tomoyo_socket_sendmsg_permission

[Tetsuo Handa]

On 2021/02/12 10:34, Shuah Khan wrote:
> 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@xxxxxxxxxxxxxxxxxxx ,
>> 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?

There is no reproducer for "general protection fault in tomoyo_socket_sendmsg_permission" problem, but
the race condition is explained at https://lkml.kernel.org/r/676d4518-0faa-9fab-15db-0db8d216d7fb@xxxxxxxxxxxxxxxxxxx .