Theo de Raadt wrote:

> One of these days someone is going to use the magic of a system call
> interposition mechanism such systrace; and for their application
> accidentally create an operating system behaviour that is un-POSIX,
> and some application is going to misbehave as a result of that change
> and inadvertantly this will result in the CREATION of a hole.

For a concrete example regarding POSIX 1e capabilities (which
are essentially a "system call interposition mechanism"):

http://ciac.llnl.gov/ciac/bulletins/k-064.shtml

Summary: If a root process doesn't have CAP_SETUID, attempts to give
up root privilege fail, resulting in the process continuing to run as
root.

--
Glynn Clements <glynn.clements (at) virgin (dot) net [email concealed]>

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