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SubjectRe: [PATCH] [Backport for stable 5.11] arm64: mm: correct the inside linear map boundaries during hotplug check
On Mon, Mar 29, 2021 at 10:28:47AM -0400, Pavel Tatashin wrote:
>commit ee7febce051945be28ad86d16a15886f878204de upstream.
>
>Memory hotplug may fail on systems with CONFIG_RANDOMIZE_BASE because the
>linear map range is not checked correctly.
>
>The start physical address that linear map covers can be actually at the
>end of the range because of randomization. Check that and if so reduce it
>to 0.
>
>This can be verified on QEMU with setting kaslr-seed to ~0ul:
>
>memstart_offset_seed = 0xffff
>START: __pa(_PAGE_OFFSET(vabits_actual)) = ffff9000c0000000
>END: __pa(PAGE_END - 1) = 1000bfffffff
>
>Fixes: 58284a901b42 ("arm64/mm: Validate hotplug range before creating linear mapping")
>Signed-off-by: Pavel Tatashin <pasha.tatashin@soleen.com>
>Tested-by: Tyler Hicks <tyhicks@linux.microsoft.com>
>Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>

Queued up, thanks!

--
Thanks,
Sasha

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