Re: BUG: KASAN: global-out-of-bounds in unmap_kernel_at_el0+0x70/0x1a0

[Mark Rutland]

On Sun, Apr 22, 2018 at 12:47:57PM +0200, Jan Kiszka wrote:
> Hi,
> 
> this can be triggered simply by running
> 
> # echo 0 > /sys/devices/system/cpu/cpu3/online
> # echo 1 > /sys/devices/system/cpu/cpu3/online
> 
> [  455.904854] ==================================================================
> [  455.906108] BUG: KASAN: global-out-of-bounds in unmap_kernel_at_el0+0x70/0x1a0
> [  455.906668] Read of size 4 at addr ffff200008e3a9d8 by task swapper/3/0

It looks like we miss a sentinel in kpti_safe_list.

Does the below help?

Mark.

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