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Re: pthread_getugid_np and pthread_setugid_np?

Subject: Re: pthread_getugid_np and pthread_setugid_np?
From: Kaelin Colclasure <email@hidden>
Date: Mon, 28 Jan 2008 09:49:11 -0800
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On Jan 27, 2008, at 4:47 PM, James Bucanek wrote:

Kaelin Colclasure <mailto:email@hidden> wrote (Saturday, January 26, 2008 5:02 PM -0800):
It's not a security mechanism-- a thread that had the privilege to set credentials can always revert back to its original credentials by calling:

pthread_setugid_np(KAUTH_UID_NONE, KAUTH_GID_NONE);
Sweet!
That's exactly what I was looking for. So can you tell me if that's documented anywhere -- or is this just in the collective knowledge of the Mac OS X Gestalt?

Do you consider the kernel sources documentation? ;-)

• /* • * Set the per-thread override identity. The first parameter can be the • * current real UID, KAUTH_UID_NONE, or, if the caller is priviledged, it • * can be any UID. If it is KAUTH_UID_NONE, then as a special case, this • * means "revert to the per process credential"; otherwise, if permitted, • * it changes the effective, real, and saved UIDs and GIDs for the current • * thread to the requested UID and single GID, and clears all other GIDs. • */

This comment prefixes the implementation of settid in xnu/bsd/kern/ kern_prot.c.

I'll file a bug report on the lack of documentation for pthread_getugid_np/pthread_setugid_np.

Yes, please do... :-)

Thanks so very much for the info.

NP.

-- Kaelin

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	>Re: pthread_getugid_np and pthread_setugid_np? (From: James Bucanek <email@hidden>)

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