initscripts: Use current date as an additional source of entropy

If the seed file is empty or does not exist, the date is an extremely
poor backup source of entropy, but it is better than nothing.

(From OE-Core rev: 0a41a7c20316c7d3330233a624d8cf20ea5a81ae)

Signed-off-by: Richard Tollerton <rich.tollerton@ni.com>
Signed-off-by: Ben Shelton <ben.shelton@ni.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 5 insertions, 6 deletions

diff --git a/meta/recipes-core/initscripts/initscripts-1.0/urandom b/meta/recipes-core/initscripts/initscripts-1.0/urandom
index a0549dec25..ec4ef61f23 100755
--- a/meta/recipes-core/initscripts/initscripts-1.0/urandom
+++ b/meta/recipes-core/initscripts/initscripts-1.0/urandom
@@ -20,12 +20,11 @@ RANDOM_SEED_FILE=/var/lib/urandom/random-seed
 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 "$RANDOM_SEED_FILE"
-                then
-                        cat "$RANDOM_SEED_FILE" >/dev/urandom
-                fi
+                # 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 \