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

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Date:   Thu, 6 Dec 2018 17:28:40 +0000
From:   Nadav Amit <namit@...are.com>
To:     Peter Zijlstra <peterz@...radead.org>
CC:     Ingo Molnar <mingo@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Damian Tometzki <linux_dti@...oud.com>,
        "linux-integrity@...r.kernel.org" <linux-integrity@...r.kernel.org>,
        "linux-security-module@...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 Dec 6, 2018, at 1:57 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> 
> 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() :-)

Thanks - it makes much more sense… I took the first thing that Google
showed.