Re: [PATCH] Fix: buffer overflow during hvc_alloc().

[Andrew Donnellan]

On 6/4/20 6:05 pm, Andrew Melnichenko wrote:
>     Steps to Reproduce:
>
>     1. boot guest with command [1]
>     2. load and unload virtio_console inside guest with loop.sh
>      Â Â# cat loop.sh
>      Â Â while [ 1 ]
>      Â Â do
>     modprobe virtio_console
>     lsmod | grep virt
>     modprobe -r virtio_console
>     lsmod | grep virt
>      Â Â done
>
>
>
>     Actual results:
>     Guest reboot and can get vmcore-dmesg.txt file
>
>
>     Expected results:
>     Guest works well without error
>
>
>     Additional info:
>     The whole log will attach to the attachments.
>
>     Call Trace:
>     [ Â 22.974500] fuse: init (API version 7.31)
>     [ Â 81.498208] ------------[ cut here ]------------
>     [ Â 81.499263] pvqspinlock: lock 0xffffffff92080020 has corrupted
>     value 0xc0774ca0!
>     [ Â 81.501000] WARNING: CPU: 0 PID: 785 at
>     kernel/locking/qspinlock_paravirt.h:500

[snip]

Thanks!

You should include an appropriate excerpt from this - the WARNING 
message and stack trace, and the steps to reproduce - in the commit 
message of the patch.


--
Andrew Donnellan              OzLabs, ADL Canberra
ajd@xxxxxxxxxxxxx             IBM Australia Limited