Re: [RFC][PATCH 1/2] fs proc: make pagemap a privileged interface

[Dave Hansen]

On 03/09/2015 04:08 PM, Eric W. Biederman wrote:
> If the concern is to protect against root getting into the kernel the
> "trusted_kernel" snake-oil just compile out the pagemap file.  Nothing
> else is remotely interesting from a mainenance point of view.

The paper I linked to showed one example of how pagemap makes a
user->kernel exploint _easier_.  Note that the authors had another way
of actually doing the exploit when pagemap was not available, but it
required some more trouble than if pagemap was around.

I mentioned the "trusted_kernel" stuff as an aside.  It's really not the
main concern.
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