Re: capget() overflows buffers.

[Chris Wright <chrisw@sous-sol.org>]

* Andrew G. Morgan (morgan@kernel.org) wrote:
> Your concern is for the situation when the garbage happens to correspond
> to an apparently meaningful setting for the upper capability bits? The
> problem being that this privileged application is more privileged than
> intended? I agree that this is not ideal.

Yep, exactly.

> In practice, however, this is only a real problem if named (or a
> similarly structured program) has a security related bug in it. No?

It's dropped privileges to help mitigate any security related bug it
may contain.  It's conceivable (albeit remote[1]) that fork/exec plus
inheritable could leak privs w/out a security related bug.

> Is this your concern, or have I missed something?

That's it.

thanks,
-chris

[1] Get lucky combo in the garbage bits and have not shed uid 0.
Much less likely.