92b264676c
getpwnam_r() guarantees that the strings in the struct passwd that it returns are pointers into the buffer allocated by the application and passed to getpwnam_r(). This means applications may choose to modify the strings in place, as long as the length of the strings is not increased. So it's wrong for us to return a static string here, we really do have to copy it into the application-provided buffer like we do for all the other strings. This is only a theoretical problem since it would be very weird for an application to modify the pw_passwd field, but I spotted this when investigating a similar crash caused by glib editing a different field. See also: https://gitlab.gnome.org/GNOME/glib/-/merge_requests/2244
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