[future patch] dropping user privileges on demand

[Kris Kennaway]

On Thu, Aug 21, 2003 at 01:58:54AM -0500, Dan Nelson wrote:

> It does something similar, but uses a C-like language to control a
> processes actions.  This lets you get extremely fine-grained control
> (allow httpd to bind to only port 80, once), but the rules run as
> "root", so they can grant as well as revoke privileges.  A useful
> modification would be to allow users to submit their own policies that
> can only disallow actions (i.e. all arguments and process variables are
> read-only, and the script can either pass the syscall through or return
> a failure code, nothing else).

Exercise for the reader: find a situation where the failure to perform
a syscall that normally succeeds, leads to privilege escalation :-)

Kris
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