[Bug nptl/13347] Threaded setuid() can wrongly report success when failing to drop privileges

["carlos at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=13347

--- Comment #8 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to Rich Felker from comment #7)
> I'd like to apologize for not following up on this. I started looking into
> it back then, but I didn't feel comfortable enough with my understanding of
> the code to propose something at the time, and got sidetracked/busy with my
> own projects. Perhaps my input is more valuable discussing the issue and
> offering feedback on a patch someone else proposes than trying to work on
> the code myself.

That's fine. Feel free to unassign yourself. This is a hard problem to fix. IMO
it requires a new kernel syscall to do setxid in one shot pass or fail.

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