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Date: Wed, 27 Feb 2013 12:06:14 -0500
From: Rich Felker <>
Subject: Re: shadow.h

On Wed, Feb 27, 2013 at 06:04:08PM +0100, Daniel Cegiełka wrote:
> 2013/2/27 Rich Felker <>:
> >>
> >> I prefer tcb, but the current implementation in musl isn't as
> >> functional as owl's (privilege separation):
> >
> > Can you explain this better?
> Owl's tcb uses SGID instead SUID, so SUID is not needed for programs
> like passwd. Here is a good presentation:

This has nothing to do with the interfaces in libc, which do not
modify any tcb data. They only read it and they work with whichever
privilege model you prefer.


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