linux-kernel - Re: [kernel-hardening] [PATCH 4/6] Protectable Memory

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Message-ID: <17e5b515-84c8-dca2-1695-cdf819834ea2@huawei.com>
Date:   Sun, 4 Feb 2018 17:05:25 +0200
From:   Igor Stoppa <igor.stoppa@...wei.com>
To:     Boris Lukashev <blukashev@...pervictus.com>
CC:     Christopher Lameter <cl@...ux.com>,
        Matthew Wilcox <willy@...radead.org>,
        Jann Horn <jannh@...gle.com>,
        Jerome Glisse <jglisse@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Michal Hocko <mhocko@...nel.org>,
        Laura Abbott <labbott@...hat.com>,
        Christoph Hellwig <hch@...radead.org>,
        linux-security-module <linux-security-module@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        "Kernel Hardening" <kernel-hardening@...ts.openwall.com>
Subject: Re: [kernel-hardening] [PATCH 4/6] Protectable Memory

On 04/02/18 00:29, Boris Lukashev wrote:
> On Sat, Feb 3, 2018 at 3:32 PM, Igor Stoppa <igor.stoppa@...wei.com> 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 ...

--
igor