Author: obrien Date: Tue Sep 4 21:47:09 2012 New Revision: 240108 URL: http://svn.freebsd.org/changeset/base/240108
Log: * Rather than run the same 'ps' command twice, add 'kenv' which often gives machine unique values from the firmware. * The kernel is more likely to be unique than /bin/ls (but no need to stuff many megabytes into /dev/random, so hash it). * Change ordering to give larger variance across reboots to reduce predictability. Modified: head/etc/rc.d/initrandom Modified: head/etc/rc.d/initrandom ============================================================================== --- head/etc/rc.d/initrandom Tue Sep 4 21:40:53 2012 (r240107) +++ head/etc/rc.d/initrandom Tue Sep 4 21:47:09 2012 (r240108) @@ -27,9 +27,11 @@ better_than_nothing() # harvesting rate. # Entropy below is not great, but better than nothing. # This unblocks the generator at startup - ( ps -fauxww; sysctl -a; date; df -ib; dmesg; ps -fauxww ) \ + # Note: commands are ordered to cause the most variance across reboots. + ( kenv; dmesg; df -ib; ps -fauxww; date; sysctl -a ) \ + | dd of=/dev/random bs=8k 2>/dev/null + /sbin/sha256 -q `sysctl -n kern.bootfile` \ | dd of=/dev/random bs=8k 2>/dev/null - cat /bin/ls | dd of=/dev/random bs=8k 2>/dev/null } initrandom_start() _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"