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freebsd/etc/rc.d/cleanvar
Mark Felder 330d62831f Refactor cleanvar to remove shell expansion vulnerability
If any process creates a directory named "-P" in /var/run or
/var/spool/lock it will cause the purgedir function to start to rm -r /.

Simplify a lot of complicated shell logic by leveraging find(1).

Reviewed by:	allanjude
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D13778
2018-02-06 21:35:41 +00:00

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#!/bin/sh
#
# $FreeBSD$
#
# PROVIDE: cleanvar
# REQUIRE: var
. /etc/rc.subr
name="cleanvar"
desc="Purge /var directory"
rcvar="cleanvar_enable"
start_precmd="${name}_prestart"
start_cmd="${name}_start"
stop_cmd=":"
extra_commands="reload"
reload_cmd="${name}_start"
cleanvar_prestart()
{
# These files must be removed only the first time this script is run
# on boot.
#
rm -f /var/run/clean_var /var/spool/lock/clean_var
}
cleanvar_start()
{
if [ -d /var/run -a ! -f /var/run/clean_var ]; then
# Skip over logging sockets
find /var/run \( -type f -or -type s ! -name log -and ! -name logpriv \) -delete
>/var/run/clean_var
fi
if [ -d /var/spool/lock -a ! -f /var/spool/lock/clean_var ]; then
find /var/spool/lock -type f -delete
>/var/spool/lock/clean_var
fi
if [ -d /var/spool/uucp/.Temp ]; then
find /var/spool/uucp/.Temp -delete
fi
}
load_rc_config $name
run_rc_command "$1"