10.10.2013 17:44, Richard W.M. Jones wrote:

In Fedora we have had /dev/kvm mode 0666 for years.  It was changed
that way in July 2009.

There has never been a security problem attributable to this.

This is plain wrong.  Here's a very recent example:

 http://www.openwall.com/lists/oss-security/2013/08/26/3

There is no problem with having any user create a VM.  Virtual
machines are regular processes, subject to all the usual ulimits.
They use regular malloc'd memory.

That's righ, except that /dev/kvm is also kvm.ko with their own set
of controls and bugs like the above.  And this is what the whole
thing is about, -- additional security holes due to access to /dev/kvm.

/mjt


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