On 2021/01/30 1:05, Shuah Khan wrote:
>> Since "general protection fault in tomoyo_socket_sendmsg_permission" is
>> caused by
>> unexpectedly resetting ud->tcp_socket to NULL without waiting for tx thread
>> to
>> terminate, tracing the ordering of events is worth knowing. Even adding
>> schedule_timeout_uninterruptible() to before kernel_sendmsg() might help.
>>
>
> What about the duplicate bug information that was in my email?
> Did you take a look at that?
I was not aware of the duplicate bugs. It is interesting that
"KASAN: null-ptr-deref Write in event_handler" says that vdev->ud.tcp_tx became
NULL at
if (vdev->ud.tcp_tx) {
/* this location */
kthread_stop_put(vdev->ud.tcp_tx);
vdev->ud.tcp_tx = NULL;
}
which means that somebody else is unexpectedly resetting vdev->ud.tcp_tx to
NULL.
If memset() from vhci_device_init() from vhci_start() were unexpectedly called,
all of tcp_socket, tcp_rx, tcp_tx etc. becomes NULL which can explain these
bugs ?
I'm inclined to report not only tcp_socket but also other fields when
kernel_sendmsg()
detected that tcp_socket is NULL...
