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Date: Mon, 12 Feb 2018 16:40:40 -0800
From: Laura Abbott <>
To: Kees Cook <>, Igor Stoppa <>
Cc: Boris Lukashev <>,
 Christopher Lameter <>, Matthew Wilcox <>,
 Jann Horn <>, Jerome Glisse <>,
 Michal Hocko <>, Christoph Hellwig <>,
 linux-security-module <>,
 Linux-MM <>, kernel list <>,
 Kernel Hardening <>
Subject: Re: [PATCH 4/6] Protectable Memory

On 02/12/2018 03:27 PM, Kees Cook wrote:
> On Sun, Feb 4, 2018 at 7:05 AM, Igor Stoppa <> wrote:
>> On 04/02/18 00:29, Boris Lukashev wrote:
>>> On Sat, Feb 3, 2018 at 3:32 PM, Igor Stoppa <> wrote:
>> [...]
>>>> What you are suggesting, if I have understood it correctly, is that,
>>>> when the pool is protected, the addresses already given out, will become
>>>> traps that get resolved through a lookup table that is built based on
>>>> the content of each allocation.
>>>> That seems to generate a lot of overhead, not to mention the fact that
>>>> it might not play very well with the MMU.
>>> That is effectively what i'm suggesting - as a form of protection for
>>> consumers against direct reads of data which may have been corrupted
>>> by some irrelevant means. In the context of pmalloc, it would probably
>>> be a separate type of ro+verified pool
>> ok, that seems more like an extension though.
>> ATM I am having problems gaining traction to get even the basic merged :-)
>> I would consider this as a possibility for future work, unless it is
>> said that it's necessary for pmalloc to be accepted ...
> I would agree: let's get basic functionality in first. Both
> verification and the physmap part can be done separately, IMO.

Skipping over physmap leaves a pretty big area of exposure that could
be difficult to solve later. I appreciate this might block basic
functionality but I don't think we should just gloss over it without
at least some idea of what we would do.


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