[Bug 255420] pam_exec expose_auth_tok segfaults

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=255420

--- Comment #1 from Rudolf Polzer <divVerent at gmail.com> ---
I should add: my use case is mounting an encrypted ZFS dataset on login, and
unmounting on logout.

So I have no use case of actually getting the password in pam_sm_setcred, and
there's already an environment variable provided by pam_exec that lets me
distinguish; for me it'd thus be perfectly fine if stdin were just empty in the
pam_sm_setcred case.

For now I am using pam_script from the ports; this does seem to work, but seems
more complex than actually required.

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