diff -r c3565a90b8c4 lib/freebl/unix_rand.c
--- a/lib/freebl/unix_rand.c	Fri Jan 03 20:59:10 2014 +0100
+++ b/lib/freebl/unix_rand.c	Tue Jan 07 11:28:59 2014 -0800
@@ -916,8 +916,19 @@
 #if defined(BSDI) || defined(FREEBSD) || defined(NETBSD) \
     || defined(OPENBSD) || defined(DARWIN) || defined(LINUX) \
     || defined(HPUX)
-    if (bytes)
+    if (bytes == SYSTEM_RNG_SEED_COUNT)
         return;
+
+    /*
+     * Modified to abort the process if it failed to read from /dev/urandom.
+     *
+     * See crbug.com/244661 for details.
+     */
+    fprintf(stderr, "[ERROR:%s(%d)] NSS read %zu bytes (expected %d bytes) "
+            "from /dev/urandom. Abort process.\n", __FILE__, __LINE__,
+            bytes, SYSTEM_RNG_SEED_COUNT);
+    fflush(stderr);
+    abort();
 #endif
 
 #ifdef SOLARIS
@@ -1134,6 +1145,11 @@
    }
 }
 
+/*
+ * Modified to abort the process if it failed to read from /dev/urandom.
+ *
+ * See crbug.com/244661 for details.
+ */
 size_t RNG_SystemRNG(void *dest, size_t maxLen)
 {
     FILE *file;
@@ -1144,7 +1160,10 @@
 
     file = fopen("/dev/urandom", "r");
     if (file == NULL) {
-	return rng_systemFromNoise(dest, maxLen);
+	fprintf(stderr, "[ERROR:%s(%d)] NSS failed to read from /dev/urandom. "
+		"Abort process.\n", __FILE__, __LINE__);
+	fflush(stderr);
+	abort();
     }
     /* Read from the underlying file descriptor directly to bypass stdio
      * buffering and avoid reading more bytes than we need from /dev/urandom.
@@ -1164,8 +1183,10 @@
     }
     fclose(file);
     if (fileBytes != maxLen) {
-	PORT_SetError(SEC_ERROR_NEED_RANDOM);  /* system RNG failed */
-	fileBytes = 0;
+	fprintf(stderr, "[ERROR:%s(%d)] NSS failed to read from /dev/urandom. "
+		"Abort process.\n", __FILE__, __LINE__);
+	fflush(stderr);
+	abort();
     }
     return fileBytes;
 }