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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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 ?