Messages in this thread | | | Subject | Re: general protection fault in tomoyo_socket_sendmsg_permission | From | Tetsuo Handa <> | Date | Thu, 11 Feb 2021 04:07:59 +0900 |
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On 2021/02/11 3:17, Shuah Khan wrote: > I am looking to understand the syzbot configuration and a reproducer > to be able to debug and fix the problem. How is syzbot triggering the > vhci_hcd attach and detach sequence?
I don't know. I'm waiting for syzbot to reproduce the problem on linux-next with https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/drivers/usb/usbip?id=f1bdf414e7dd0cbc26460425719fc3ea479947a2 .
> > This helps me determine all these fix suggestions that are coming in > are fixes or papering over a real problem.
What are these fix suggestions?
"general protection fault in tomoyo_socket_sendmsg_permission" is a NULL pointer dereference which can happen if vhci_device_reset() and/or vhci_device_init() (which does vdev->ud.tcp_socket = NULL;) were unexpectedly called. There is no reproducer, and (as far as I know) no fix suggestion.
"KASAN: null-ptr-deref Write in vhci_shutdown_connection" is an ERR_PTR(-EINTR) pointer dereference which can happen if kthread_create() was SIGKILLed. There is a reproducer, and https://lkml.kernel.org/r/20210205135707.4574-1-penguin-kernel@I-love.SAKURA.ne.jp is a fix suggestion.
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