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

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Message-ID: <CAFUG7CfrCpcbwgf5ixMC5EZZgiVVVp1NXhDHK1UoJJcC08R2qQ@mail.gmail.com>
Date:   Sat, 3 Feb 2018 15:12:20 -0500
From:   Boris Lukashev <blukashev@...pervictus.com>
To:     Igor Stoppa <igor.stoppa@...wei.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 Sat, Feb 3, 2018 at 2:57 PM, Igor Stoppa <igor.stoppa@...wei.com> wrote:
>>> On Thu, 25 Jan 2018, Matthew Wilcox wrote:
>
>>>> It's worth having a discussion about whether we want the pmalloc API
>>>> or whether we want a slab-based API.
> I'd love to have some feedback specifically about the API.
>
> I have also some idea about userspace and how to extend the pmalloc
> concept to it:
>
> http://www.openwall.com/lists/kernel-hardening/2018/01/30/20
>
> I'll be AFK intermittently for about 2 weeks, so i might not be able to
> reply immediately, but from my perspective this would be just the
> beginning of a broader hardening of both kernel and userspace that I'd
> like to pursue.
>
> --
> igor

Regarding the notion of validated protected memory, is there a method
by which the resulting checksum could be used in a lookup
table/function to resolve the location of the protected data?
Effectively a hash table of protected allocations, with a benefit of
dedup since any data matching the same key would be the same data
(multiple identical cred structs being pushed around). Should leave
the resolver address/csum in recent memory to check against, right?

-- 
Boris Lukashev
Systems Architect
Semper Victus