Pass the password into mount.cifs via a file descriptor, rather than putting it into a plain-text file in /tmp. This uses the $PASSWD_FD environment variable, which is undocumented but has existed since forever (initial commit from 2010 [1] has it already) [1]: https://git.samba.org/?p=cifs-utils.git;a=blob;f=mount.cifs.c;hb=ce0b1609a9eedce6c5eb20eab287ea44217c0a6a#l1477
System and Service Manager
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