Submitted By: Robert Connolly <robert at linuxfromscratch dot org> (ashes)
Date: 2004-04-25
Initial Package Version: 1.5
Origin: None
Description: This uses sysctl erandom instead of urandom for mktemp.
Do not use the --with-libc configure option with this patch or it will
not work.

This patch depends on erandom sysctl from:
http://frandom.sourceforge.net/
http://www.linuxfromscratch.org/hints/downloads/files/entropy.txt
Thanks to Eli Billauer

This is the kernel patch, check for newer versions.
http://www.linuxfromscratch.org/patches/downloads/linux/\
linux-2.4.26-frandom-1.patch

Also see:
http://www.linuxfromscratch.org/hlfs/

diff -Naur lfs-utils-0.5.orig/mktemp-1.5/configure lfs-utils-0.5.frandom/mktemp-1.5/configure
--- lfs-utils-0.5.orig/mktemp-1.5/configure	2003-03-24 01:06:43.000000000 +0000
+++ lfs-utils-0.5.frandom/mktemp-1.5/configure	2004-04-26 07:15:06.000000000 +0000
@@ -3643,7 +3643,7 @@
 if test -n "$with_random"; then
     mktemp_cv_dev_urandom="with_random=$with_random"
 elif test -r /dev/urandom; then
-    mktemp_cv_dev_urandom="with_random=/dev/urandom"
+    mktemp_cv_dev_urandom="with_random=erandom"
 else
     mktemp_cv_dev_urandom="with_random=no"
 fi
diff -Naur lfs-utils-0.5.orig/mktemp-1.5/configure.in lfs-utils-0.5.frandom/mktemp-1.5/configure.in
--- lfs-utils-0.5.orig/mktemp-1.5/configure.in	2003-03-24 01:04:49.000000000 +0000
+++ lfs-utils-0.5.frandom/mktemp-1.5/configure.in	2004-04-26 07:15:06.000000000 +0000
@@ -172,7 +172,7 @@
 if test -n "$with_random"; then
     mktemp_cv_dev_urandom="with_random=$with_random"
 elif test -r /dev/urandom; then
-    mktemp_cv_dev_urandom="with_random=/dev/urandom"
+    mktemp_cv_dev_urandom="with_random=erandom"
 else
     mktemp_cv_dev_urandom="with_random=no"
 fi
diff -Naur lfs-utils-0.5.orig/mktemp-1.5/random.c lfs-utils-0.5.frandom/mktemp-1.5/random.c
--- lfs-utils-0.5.orig/mktemp-1.5/random.c	2001-10-01 00:21:34.000000000 +0000
+++ lfs-utils-0.5.frandom/mktemp-1.5/random.c	2004-04-26 07:15:16.000000000 +0000
@@ -26,6 +26,7 @@
  */
 
 #include "config.h"
+#include <sys/sysctl.h>
 
 #include <sys/types.h>
 #if defined(TIME_WITH_SYS_TIME) || defined(HAVE_SYS_TIME_H)
@@ -105,16 +106,17 @@
 	SEED_T seed;
 	struct timeval tv;
 
-#ifdef _PATH_RANDOM
-	int fd;
+        int i, mib[3];
+        size_t len;
+        mib[0] = CTL_KERN;
+        mib[1] = KERN_RANDOM;
+        mib[2] = RANDOM_ERANDOM;
+	len = sizeof(seed);
 
-	if ((fd = open(_PATH_RANDOM, O_RDONLY)) != -1 &&
-	    read_loop(fd, &seed, sizeof(seed)) == sizeof(seed)) {
-		close(fd);
+	if (sysctl(mib, 3, &seed, &len, NULL, 0) != -1) {
 		SRAND(seed);
-		return;
-	}
-#endif /* _PATH_RANDOM */
+                return;
+        }
 
 	/* Don't have /dev/random */
 	/* XXX - check for gettimeofday() and use time() if none? */