linux-kernel - Re: [PATCH V3] KSM: allow dedup all tasks memory

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 13 Nov 2018 14:35:21 -0800
From:   Pavel Tatashin <pasha.tatashin@...een.com>
To:     Jann Horn <jannh@...gle.com>
Cc:     Oleksandr Natalenko <oleksandr@...alenko.name>,
        linux-doc@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Timofey Titovets <timofey.titovets@...esis.ru>,
        Matthew Wilcox <willy@...radead.org>, daniel@...ss.cc
Subject: Re: [PATCH V3] KSM: allow dedup all tasks memory

> Wait, what? Can you name specific ones? Nowadays, enabling KSM for
> untrusted VMs seems like a terrible idea to me, security-wise.

Of course it is not used to share data among different
customers/tenants, as far as I know it is used by Oracle Cloud to
merge the same pages in clear containers.

https://medium.com/cri-o/intel-clear-containers-and-cri-o-70824fb51811
One performance enhancing feature is the use of KSM, a recent KVM
optimized for memory sharing and boot speed. Another is the use of an
optimized Clear Containers mini-OS.

Pasha