linux-kernel - Re: [RFC PATCH v1 3/6] powerpc: Add skeleton for Kernel Userspace Execution Prevention

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Date:   Mon, 19 Nov 2018 13:44:08 +1100
From:   Russell Currey <ruscur@...sell.cc>
To:     Christophe Leroy <christophe.leroy@....fr>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [RFC PATCH v1 3/6] powerpc: Add skeleton for Kernel Userspace
 Execution Prevention

On Wed, 2018-11-07 at 16:56 +0000, Christophe Leroy wrote:
> This patch adds a skeleton for Kernel Userspace Execution Prevention.
> 
> Then subarches implementing it have to define CONFIG_PPC_HAVE_KUEP
> and provide setup_kuep() function.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>

An open question (with nothing to do specifically with this patch):

For what reason would you ever disable execution prevention?  Clearly
there must be something since "nosmep" is a thing, but I don't know why
we'd ever do it.

- Russell