Linked by Thom Holwerda on Wed 5th Mar 2008 09:43 UTC, submitted by diegocg
Sun Solaris, OpenSolaris "OpenSolaris has launched a new project, Flexible Mandatory Access Control, to integrate the Flask/TE security scheme into their OS. This is the same underlying model implemented by SELinux, and follows other cross-platform Flask/TE integration projects such as SEDarwin and SEBSD. This is very exciting in terms of establishing compatible security across operating systems, particularly for Mandatory Access Control, which has traditionally been narrowly focused and generally incompatible. With FMAC, we're closer to seeing truly ubiquitous, cross-platform MAC security."
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RE[5]: Trusted Solaris?
by Method on Wed 5th Mar 2008 18:20 UTC in reply to "RE[4]: Trusted Solaris?"
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Any idea why the cost is so high?

On Windows, we do the expensive security check when you open a handle (aka fd) and you are granted tbe desired rights until you close the handle. There is a cost when using handles of checking that the handle has been given the right needed for each operation, but it's a single AND and a comparison that happens in the handle table lookup codepath.

What does SELinux do that is more expensive?

It use to revalidate read/write perms on every read and write so that if access were revoked, due to file relabeling, policy reload, an open file descriptor being passed to a domain that did not have read/write access or policy boolean change the access would be denied.

Now it still supports that but doesn't have to consult the policy each time because it keeps the policy sequence number, which is incremented and keeps track of relabels.

This is different than most other implementations because we wanted to support revocation and wanted to be able to fully understand, via policy, what domains could access what files. Unfortunately we can't fully support revocation due to the ability to mmap() files.

Edited 2008-03-05 18:24 UTC

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