Re: [PATCH v3] x86/fault: Send a SIGBUS to user process always for hwpoison page access.

[Peter Zijlstra]

On Thu, Mar 11, 2021 at 04:52:10PM +0000, Luck, Tony wrote:
> > I think we need to at least fix the existing bug before we add more
> > signals.  AFAICS the MCE_IN_KERNEL_COPYIN code is busted for kernel
> > threads.
> 
> Can a kernel thread do get_user() or copy_from_user()?  Do we have kernel threads
> that have an associated user address space to copy from?

kthread_use_mm()