conf fuzzer: also check for an empty file

[oweals/openssl.git] / crypto / init.c

diff --git a/crypto/init.c b/crypto/init.c
index 7423eccb1b326c771043097a2300f0f9cf3a10a2..a939cb16d462c7d59b8de02f5766deb77e73b20f 100644 (file)
--- a/crypto/init.c
+++ b/crypto/init.c
@@ -23,6 +23,7 @@
 #include <stdlib.h>
 #include <assert.h>
 #include <internal/thread_once.h>
+#include <internal/dso.h>
 
 static int stopped = 0;
 
@@ -79,6 +80,34 @@ DEFINE_RUN_ONCE_STATIC(ossl_init_base)
         return 0;
     OPENSSL_cpuid_setup();
     base_inited = 1;
+
+#ifndef OPENSSL_USE_NODELETE
+# ifdef DSO_WIN32
+    {
+        HMODULE handle = NULL;
+        BOOL ret;
+
+        /* We don't use the DSO route for WIN32 because there is a better way */
+        ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
+                                | GET_MODULE_HANDLE_EX_FLAG_PIN,
+                                (void *)&base_inited, &handle);
+
+        return (ret == TRUE) ? 1 : 0;
+    }
+# else
+    /*
+     * Deliberately leak a reference to ourselves. This will force the library
+     * to remain loaded until the atexit() handler is run a process exit.
+     */
+    {
+        DSO *dso = NULL;
+
+        dso = DSO_dsobyaddr(&base_inited, DSO_FLAG_NO_UNLOAD_ON_FREE);
+        DSO_free(dso);
+    }
+# endif
+#endif
+
     return 1;
 }
 
@@ -575,6 +604,47 @@ int OPENSSL_atexit(void (*handler)(void))
 {
     OPENSSL_INIT_STOP *newhand;
 
+#ifndef OPENSSL_USE_NODELETE
+    {
+        union {
+            void *sym;
+            void (*func)(void);
+        } handlersym;
+
+        handlersym.func = handler;
+# ifdef DSO_WIN32
+        {
+            HMODULE handle = NULL;
+            BOOL ret;
+
+            /*
+             * We don't use the DSO route for WIN32 because there is a better
+             * way
+             */
+            ret = GetModuleHandleEx(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS
+                                    | GET_MODULE_HANDLE_EX_FLAG_PIN,
+                                    handlersym.sym, &handle);
+
+            if (!ret)
+                return 0;
+        }
+# else
+        /*
+         * Deliberately leak a reference to the handler. This will force the
+         * library/code containing the handler to remain loaded until we run the
+         * atexit handler. If -znodelete has been used then this is
+         * unneccessary.
+         */
+        {
+            DSO *dso = NULL;
+
+            dso = DSO_dsobyaddr(handlersym.sym, DSO_FLAG_NO_UNLOAD_ON_FREE);
+            DSO_free(dso);
+        }
+# endif
+    }
+#endif
+
     newhand = OPENSSL_malloc(sizeof(*newhand));
     if (newhand == NULL)
         return 0;