linux-kernel - Re: [PATCH V3] arm64/mm: Validate hotplug range before creating linear mapping

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Date:   Fri, 13 Nov 2020 11:27:35 +0000
From:   Will Deacon <will@...nel.org>
To:     Anshuman Khandual <anshuman.khandual@....com>,
        linux-arm-kernel@...ts.infradead.org
Cc:     catalin.marinas@....com, kernel-team@...roid.com,
        Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org,
        Robin Murphy <robin.murphy@....com>,
        Steven Price <steven.price@....com>,
        David Hildenbrand <david@...hat.com>, ardb@...nel.org,
        Mark Rutland <mark.rutland@....com>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH V3] arm64/mm: Validate hotplug range before creating linear mapping

On Fri, 13 Nov 2020 13:00:14 +0530, Anshuman Khandual wrote:
> During memory hotplug process, the linear mapping should not be created for
> a given memory range if that would fall outside the maximum allowed linear
> range. Else it might cause memory corruption in the kernel virtual space.
> 
> Maximum linear mapping region is [PAGE_OFFSET..(PAGE_END -1)] accommodating
> both its ends but excluding PAGE_END. Max physical range that can be mapped
> inside this linear mapping range, must also be derived from its end points.
> 
> [...]

Applied to arm64 (for-next/fixes), thanks!

[1/1] arm64/mm: Validate hotplug range before creating linear mapping
      https://git.kernel.org/arm64/c/58284a901b42

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev