linux-kernel - Re: [PATCH 02/11] arm64: Kconfig: Reword UNMAP_KERNEL_AT

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Message-ID: <20180104153939.GA3818@infradead.org>
Date:   Thu, 4 Jan 2018 07:39:39 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Will Deacon <will.deacon@....com>
Cc:     linux-arm-kernel@...ts.infradead.org, catalin.marinas@....com,
        ard.biesheuvel@...aro.org, marc.zyngier@....com,
        lorenzo.pieralisi@....com, christoffer.dall@...aro.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/11] arm64: Kconfig: Reword UNMAP_KERNEL_AT_EL0 kconfig
 entry

On Thu, Jan 04, 2018 at 03:08:26PM +0000, Will Deacon wrote:
> Although CONFIG_UNMAP_KERNEL_AT_EL0 does make KASLR more robust, it's
> actually more useful as a mitigation against speculation attacks that
> can leak arbitrary kernel data to userspace through speculation.
> 
> Reword the Kconfig help message to reflect this, and make the option
> depend on EXPERT so that it is on by default for the majority of users.
> 
> Signed-off-by: Will Deacon <will.deacon@....com>

Why is this not reusing the PAGE_TABLE_ISOLATION setting in
security/Kconfig ?