RNG_SystemRNG should fail rather than falling back on rng_systemFromNoise

patches/nss-urandom-abort.patch

-Index: nss/lib/freebl/unix_rand.c
+Index: unix_rand.c
 ===================================================================
---- nss/lib/freebl/unix_rand.c  (revision 204056)
-+++ nss/lib/freebl/unix_rand.c  (working copy)
-@@ -918,6 +918,16 @@
+--- unix_rand.c (revision 203531)
++++ unix_rand.c (working copy)
+@@ -916,8 +916,19 @@
+ #if defined(BSDI) || defined(FREEBSD) || defined(NETBSD) \
+     || defined(OPENBSD) || defined(DARWIN) || defined(LINUX) \
      || defined(HPUX)
-     if (bytes)
+-    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 failed to read from /dev/urandom. "
-+            "Abort process.\n", __FILE__, __LINE__);
++    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
-@@ -1132,7 +1142,15 @@
+@@ -1123,6 +1134,11 @@
+    }
+ }
+ 
++/*
++ * 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;
+@@ -1132,7 +1148,10 @@
  
      file = fopen("/dev/urandom", "r");
      if (file == NULL) {
 -       return rng_systemFromNoise(dest, maxLen);
-+       /*
-+        * 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 failed to read from /dev/urandom. "
 +               "Abort process.\n", __FILE__, __LINE__);
 +       fflush(stderr);
 +       abort();
      }
      while (maxLen > fileBytes) {
         bytes = maxLen - fileBytes;
+@@ -1144,8 +1163,10 @@
+     }
+     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;
+ }