7029 want per-process exploit mitigation features (secflags)
7030 want basic address space layout randomization (aslr)
7031 noexec_user_stack should be a secflag
7032 want a means to forbid mappings around NULL.

@@ -35,7 +35,7 @@
  */
 
         ENTRY_NP(_brk_unlocked)
         SYSTRAP_RVAL1(brk)
         SYSCERROR
-        RETC
+        RET
         SET_SIZE(_brk_unlocked)