linux-kernel - Re: [PATCH] arm64: mm: account for hotplug memory when randomizing the linear region

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Date:   Tue, 10 Nov 2020 19:14:18 +0000
From:   Catalin Marinas <catalin.marinas@....com>
To:     linux-arm-kernel@...ts.infradead.org,
        Anshuman Khandual <anshuman.khandual@....com>,
        Ard Biesheuvel <ardb@...nel.org>
Cc:     Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org,
        Mark Rutland <mark.rutland@....com>,
        Steve Capper <steve.capper@....com>,
        Mark Brown <broonie@...nel.org>, Marc Zyngier <maz@...nel.org>,
        gshan@...hat.com, Robin Murphy <robin.murphy@....com>,
        Steven Price <steven.price@....com>
Subject: Re: [PATCH] arm64: mm: account for hotplug memory when randomizing the linear region

On Wed, 14 Oct 2020 10:18:57 +0200, Ard Biesheuvel wrote:
> As a hardening measure, we currently randomize the placement of
> physical memory inside the linear region when KASLR is in effect.
> Since the random offset at which to place the available physical
> memory inside the linear region is chosen early at boot, it is
> based on the memblock description of memory, which does not cover
> hotplug memory. The consequence of this is that the randomization
> offset may be chosen such that any hotplugged memory located above
> memblock_end_of_DRAM() that appears later is pushed off the end of
> the linear region, where it cannot be accessed.
> 
> [...]

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

[1/1] arm64: mm: account for hotplug memory when randomizing the linear region
      https://git.kernel.org/arm64/c/97d6786e0669

-- 
Catalin