diff options
Diffstat (limited to 'meta/recipes-core/initscripts/initscripts-1.0/urandom')
| -rwxr-xr-x | meta/recipes-core/initscripts/initscripts-1.0/urandom | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/meta/recipes-core/initscripts/initscripts-1.0/urandom b/meta/recipes-core/initscripts/initscripts-1.0/urandom new file mode 100755 index 0000000000..b6d807cf3b --- /dev/null +++ b/meta/recipes-core/initscripts/initscripts-1.0/urandom @@ -0,0 +1,46 @@ +#! /bin/sh +### BEGIN INIT INFO +# Provides: urandom +# Required-Start: $local_fs mountvirtfs +# Required-Stop: $local_fs +# Default-Start: S +# Default-Stop: 0 6 +# Short-Description: Save and restore the random seed +# Description: Save the random seed on shutdown and restore it on boot, +# to ensure that the seed isn't predicable on startup +# (because the boot process is predictable) +### END INIT INFO + +test -c /dev/urandom || exit 0 +. /etc/default/rcS + +case "$1" in + start|"") + test "$VERBOSE" != no && echo "Initializing random number generator..." + # Load and then save 512 bytes, + # which is the size of the entropy pool + if test -f /var/lib/urandom/random-seed + then + cat /var/lib/urandom/random-seed >/dev/urandom + fi + rm -f /var/lib/urandom/random-seed + umask 077 + dd if=/dev/urandom of=/var/lib/urandom/random-seed count=1 \ + >/dev/null 2>&1 || echo "urandom start: failed." + umask 022 + ;; + stop) + # Carry a random seed from shut-down to start-up; + # see documentation in linux/drivers/char/random.c + test "$VERBOSE" != no && echo "Saving random seed..." + umask 077 + dd if=/dev/urandom of=/var/lib/urandom/random-seed count=1 \ + >/dev/null 2>&1 || echo "urandom stop: failed." + ;; + *) + echo "Usage: urandom {start|stop}" >&2 + exit 1 + ;; +esac + +exit 0 |