pam_unix doesn't fsync the tmp passwd file before overwriting /etc/passwd

[Ermanno Scaglione]

Thank you, it is frustrating to lose /etc/passwd and other important
configuration files on ext4 or XFS knowing that Firefox fsyncs a big
download (maybe a pr0n movie) while downloading to be sure nothing gets
lost. 
For a beginner can be very difficult to recover from a zero
length /etc/passwd so if doing a small change can make it safer it
should be done on my opinion.


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