Bug#902661: linux-image-4.16.0-2-amd64: kernel BUG at /build/linux-uwVqDp/linux-4.16.16/mm/usercopy.c:100!

[Luca Boccassi]

Control: reassign -1 nvidia-driver 390.48-3
Control: forcemerge 901919 -1

On Fri, 29 Jun 2018 11:02:37 +0200 Fabian <fkonline_bugs at gmx.info>
wrote:
> Package: src:linux
> Version: 4.16.16-2
> Severity: important
> 
> Dear Maintainer,
> 
> starting X via 'startx' causes every screen to stay black, no more
> interaction with mouse or keyboards is possible. So I connected via
ssh
> and tried to execute 'systemctl reboot'. Only the ssh connection was
> closed but the system stayed running without any interaction.
> After a reboot I looked again via ssh what dmesg prints out.
> It said "usercopy: Kernel memory exposure attempt detected from SLUB
> object 'nvidia_stack_cache' (offset: 11440, size 3)!", followed by
the
> message mentioned in the subject.
> Therefore the system is not usable with X in this configuration.
> 
> nvidia-driver is in version 390.67-1

Version 390.67-1 shipped a NEWS entry telling you what to do - add this
to the kernel cmdline:

slab_common.usercopy_fallback=y

-- 
Kind regards,
Luca Boccassi
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