diff --git a/cfg/posix.cfg b/cfg/posix.cfg
index 14af4d73a..c7d5540ad 100644
--- a/cfg/posix.cfg
+++ b/cfg/posix.cfg
@@ -6,9 +6,14 @@
       <not-bool/>
       <valid>0:999999</valid>
     </arg>
+    <leak-ignore/>
   </function>
+  <!-- void _exit(int status); -->
   <function name="_exit">
     <noreturn>true</noreturn>
+    <arg nr="1">
+      <not-uninit/>
+    </arg>
   </function>
   <!-- int access(const char *pathname, int mode); -->
   <function name="access">