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Date: Wed, 27 Feb 2013 18:04:08 +0100
From: Daniel Cegiełka <>
Subject: Re: shadow.h

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:

> I don't think the code in libc has
> anything to do with privilege separation model used. It only *reads*
> the tcb shadow data; it doesn't write anything, and it doesn't depend
> on any particular permissions model for the data except that it be
> readable by whichever user is doing authenticating.
> Rich

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