[Bug 192138] pw useradd and pw groupadd existence check races

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192138

Mateusz Guzik <mjg at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |mjg at FreeBSD.org

--- Comment #1 from Mateusz Guzik <mjg at FreeBSD.org> ---
Not only that, pw is racy in general w.r.t other operations.

An acceptable way around this would be to have a lock (say, /etc/.pw.lock)
which is taken at the beginning and released at the end. Preferably also
supported by other tools playing with passwd (and other files).

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