linux-kernel - Re: [PATCH] LDT improvements

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Message-ID: <20171207124347.p7kdj7q4qqs3ivri@pd.tnic>
Date:   Thu, 7 Dec 2017 13:43:47 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org,
        Brian Gerst <brgerst@...il.com>,
        David Laight <David.Laight@...lab.com>,
        Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH] LDT improvements

On Wed, Dec 06, 2017 at 11:22:21PM -0800, Andy Lutomirski wrote:
> I think I like this approach.  I also think it might be nice to move the
> whole cpu_entry_area into this new pgd range so that we can stop mucking
> around with the fixmap.

Yeah, and also, I don't like the idea of sacrificing a whole PGD
only for the LDT crap which is optional, even. Frankly - and this
is just me - I'd make CONFIG_KERNEL_PAGE_TABLE_ISOLATION xor
CONFIG_MODIFY_LDT_SYSCALL and don't give a rat's *ss about the LDT.

-- 
Regards/Gruss,
    Boris.

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