The persistent rrdtool process reads one command per line over a pipe, so a CR or LF in any field value (data source path, DS min/max, titles, substituted host values) injects a second rrdtool command. rrd_strip_control_chars() removes C0 controls and DEL from the assembled command line after all substitution, at the single point before it reaches the pipe or shell, closing the pipe/newline injection class regardless of field.
Signed-off-by: Thomas Vincent <thomasvincent@gmail.com>
Co-authored-by: TheWitness <thewitness@cacti.net>
