Messages in this thread | | | Date | Mon, 09 Mar 2015 19:28:22 -0700 | From | Dave Hansen <> | Subject | Re: [RFC][PATCH 1/2] fs proc: make pagemap a privileged interface |
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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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