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author | Patrick Williams <patrick@stwcx.xyz> | 2015-09-15 22:41:29 +0300 |
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committer | Patrick Williams <patrick@stwcx.xyz> | 2015-09-15 22:41:29 +0300 |
commit | 21f9b84b4b729fbd7acbd465e7a3f726e4d20f91 (patch) | |
tree | eb2d091d427ca0813b445509d59cc8e27e8ad25f /yocto-poky/meta/recipes-core/initscripts/initscripts-1.0/urandom | |
parent | 101cef31e2bf54c678501155cd2106251acbd076 (diff) | |
parent | c124f4f2e04dca16a428a76c89677328bc7bf908 (diff) | |
download | openbmc-21f9b84b4b729fbd7acbd465e7a3f726e4d20f91.tar.xz |
Merge commit 'c124f4f2e04dca16a428a76c89677328bc7bf908' as 'yocto-poky'
Diffstat (limited to 'yocto-poky/meta/recipes-core/initscripts/initscripts-1.0/urandom')
-rwxr-xr-x | yocto-poky/meta/recipes-core/initscripts/initscripts-1.0/urandom | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/yocto-poky/meta/recipes-core/initscripts/initscripts-1.0/urandom b/yocto-poky/meta/recipes-core/initscripts/initscripts-1.0/urandom new file mode 100755 index 000000000..af1625b5f --- /dev/null +++ b/yocto-poky/meta/recipes-core/initscripts/initscripts-1.0/urandom @@ -0,0 +1,49 @@ +#!/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 + +RANDOM_SEED_FILE=/var/lib/urandom/random-seed + +. /etc/default/rcS +[ -f /etc/default/urandom ] && . /etc/default/urandom + +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. Also load the current date, in case the seed file is + # empty. + ( date +%s.%N; [ -f "$RANDOM_SEED_FILE" ] && cat "$RANDOM_SEED_FILE" ) \ + >/dev/urandom + rm -f "$RANDOM_SEED_FILE" + umask 077 + dd if=/dev/urandom of=$RANDOM_SEED_FILE 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 "$VERBOSE" != no && echo "Saving random seed..." + umask 077 + dd if=/dev/urandom of=$RANDOM_SEED_FILE count=1 \ + >/dev/null 2>&1 || echo "urandom stop: failed." + ;; + *) + echo "Usage: urandom {start|stop}" >&2 + exit 1 + ;; +esac + +exit 0 |