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SubjectRe: [PATCH 2/2] mm: restrict access to /proc/meminfo
On Tue, 27 Sep 2011 23:38:10 +0400
Vasiliy Kulikov <segoon@openwall.com> wrote:

> On Tue, Sep 27, 2011 at 21:56 +0400, Vasiliy Kulikov wrote:
> > /proc/meminfo stores information related to memory pages usage, which
> > may be used to monitor the number of objects in specific caches (and/or
> > the changes of these numbers). This might reveal private information
> > similar to /proc/slabinfo infoleaks. To remove the infoleak, just
> > restrict meminfo to root. If it is used by unprivileged daemons,
> > meminfo permissions can be altered the same way as slabinfo:
> >
> > groupadd meminfo
> > usermod -a -G meminfo $MONITOR_USER
> > chmod g+r /proc/meminfo
> > chgrp meminfo /proc/meminfo
>
> Just to make it clear: since this patch breaks "free", I don't propose
> it anymore.

It will break top(1) too. It isn't my favoritest-ever patch :)


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