linux-kernel - Re: [PATCH v7 13/14] module: Do not set nx for module memory before freeing

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Message-ID: <20181206095715.GD13538@hirez.programming.kicks-ass.net>
Date:   Thu, 6 Dec 2018 10:57:15 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Nadav Amit <namit@...are.com>
Cc:     Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Nadav Amit <nadav.amit@...il.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        linux_dti@...oud.com, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org,
        Rick P Edgecombe <rick.p.edgecombe@...el.com>,
        Will Deacon <will.deacon@....com>
Subject: Re: [PATCH v7 13/14] module: Do not set nx for module memory before
 freeing

On Tue, Dec 04, 2018 at 05:34:07PM -0800, Nadav Amit wrote:

> So let's remove it. Andy suggested that the changes of the PTEs can be
> avoided (excluding the direct-mapping alias), which is true. However,
> in x86 it requires some cleanup of the contiguous page allocator, which
> is outside of the scope of this patch-set.

I think x86-cpa stands for change_page_attr() :-)