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From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: dgdegra@tycho.nsa.gov, xen-devel@lists.xenproject.org,
Subject: XSM permissive by default.
Date: Tue, 8 Mar 2016 20:51:00 -0500	[thread overview]
Message-ID: <20160309015100.GA5420@localhost.localdomain> (raw)


I was wondering if it we should change the default flask_bootparam
option from permissive to disabled?

The reason being is that I was startled to see that my xSplice
code was able to patch the hypervisor from within an PV guest!

Further testing showed that I could do 'xl debug-keys R' from
within the guests. This being possible with released 4.6 if I have
XSM enabled.

All of this is due to the fact that I had forgotten to load the policy,
but Xen just told me:

Flask:  Access controls disabled until policy is loaded.

which is an understatement. I somehow had expected that if no
policy was loaded it would revert to the dummy one which has the
same permission as the non-XSM build. Ha! What a surprise..

Now that the XSM is enabled via config it becomes much more
easy to enable it..

Or perhaps change the code to flask so that if there are any
errors loading the policy it uses the dummy one?

Xen-devel mailing list

             reply	other threads:[~2016-03-09  1:51 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-09  1:51 Konrad Rzeszutek Wilk [this message]
2016-03-09  2:11 ` XSM permissive by default Doug Goldstein
2016-03-09 13:24 ` Andrew Cooper
2016-03-09 21:17   ` Konrad Rzeszutek Wilk
2016-03-09 22:09     ` Daniel De Graaf
2016-03-10  2:40       ` Doug Goldstein
2016-03-10 17:10         ` Konrad Rzeszutek Wilk
2016-03-10 17:34           ` Doug Goldstein
2016-03-10 17:44           ` Andrew Cooper
2016-03-10 18:30           ` [PATCH] flask: change default state to enforcing Daniel De Graaf
2016-03-10 19:12             ` Konrad Rzeszutek Wilk
2016-03-10 19:37               ` Daniel De Graaf
2016-03-15 14:48               ` Anshul Makkar
2016-03-11  9:07             ` Jan Beulich
2016-03-11 14:58               ` Konrad Rzeszutek Wilk
2016-03-11 15:39               ` Daniel De Graaf
2016-03-11 15:43                 ` Jan Beulich
2016-03-11 15:51                   ` Daniel De Graaf
2016-04-04 17:12           ` XSM permissive by default Ian Jackson
2016-04-05  8:03             ` Jan Beulich

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