lkml.org 
[lkml]   [2019]   [Sep]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH] x86/mm: Remove set_pages_x() and set_pages_nx()
From
Date
On 9/18/19 11:45 AM, Christoph Hellwig wrote:
> On Wed, Sep 18, 2019 at 11:41:21AM -0500, Larry Finger wrote:
>> In commit 185be15143aa ("x86/mm: Remove set_pages_x() and set_pages_nx()"),
>> the wrappers were removed as they did not provide a real benefit over
>> set_memory_x() and set_memory_nx(). This change causes a problem because
>> the wrappers were exported, but the underlying routines were not. As a
>> result, external modules that used the wrappers would need to recreate
>> a significant part of memory management.
>
> And external modules do not matter for mainline decisions. In fact
> ensuring random modules can't mess with the NX state was one of the
> reasons for this patch, as that is a security issue waiting to happen.
>

Christoph,

Is there approved way for pages to be set to be executable by an external module
that would not be a security issue?

Larry

\
 
 \ /
  Last update: 2019-09-18 19:51    [W:0.052 / U:0.016 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site