diff --git a/hostapd/ctrl_iface.c b/hostapd/ctrl_iface.c
index 2bc54a52f..9d42b60ae 100644
--- a/hostapd/ctrl_iface.c
+++ b/hostapd/ctrl_iface.c
@@ -2006,74 +2006,6 @@ done:
 }
 
 
-static int hostapd_ctrl_test_alloc_fail(struct hostapd_data *hapd, char *cmd)
-{
-#ifdef WPA_TRACE_BFD
-	char *pos;
-
-	wpa_trace_fail_after = atoi(cmd);
-	pos = os_strchr(cmd, ':');
-	if (pos) {
-		pos++;
-		os_strlcpy(wpa_trace_fail_func, pos,
-			   sizeof(wpa_trace_fail_func));
-	} else {
-		wpa_trace_fail_after = 0;
-	}
-
-	return 0;
-#else /* WPA_TRACE_BFD */
-	return -1;
-#endif /* WPA_TRACE_BFD */
-}
-
-
-static int hostapd_ctrl_get_alloc_fail(struct hostapd_data *hapd,
-				       char *buf, size_t buflen)
-{
-#ifdef WPA_TRACE_BFD
-	return os_snprintf(buf, buflen, "%u:%s", wpa_trace_fail_after,
-			   wpa_trace_fail_func);
-#else /* WPA_TRACE_BFD */
-	return -1;
-#endif /* WPA_TRACE_BFD */
-}
-
-
-static int hostapd_ctrl_test_fail(struct hostapd_data *hapd, char *cmd)
-{
-#ifdef WPA_TRACE_BFD
-	char *pos;
-
-	wpa_trace_test_fail_after = atoi(cmd);
-	pos = os_strchr(cmd, ':');
-	if (pos) {
-		pos++;
-		os_strlcpy(wpa_trace_test_fail_func, pos,
-			   sizeof(wpa_trace_test_fail_func));
-	} else {
-		wpa_trace_test_fail_after = 0;
-	}
-
-	return 0;
-#else /* WPA_TRACE_BFD */
-	return -1;
-#endif /* WPA_TRACE_BFD */
-}
-
-
-static int hostapd_ctrl_get_fail(struct hostapd_data *hapd,
-				 char *buf, size_t buflen)
-{
-#ifdef WPA_TRACE_BFD
-	return os_snprintf(buf, buflen, "%u:%s", wpa_trace_test_fail_after,
-			   wpa_trace_test_fail_func);
-#else /* WPA_TRACE_BFD */
-	return -1;
-#endif /* WPA_TRACE_BFD */
-}
-
-
 static int hostapd_ctrl_reset_pn(struct hostapd_data *hapd, const char *cmd)
 {
 	struct sta_info *sta;
@@ -3703,16 +3635,15 @@ static int hostapd_ctrl_iface_receive_process(struct hostapd_data *hapd,
 		if (hostapd_ctrl_iface_data_test_frame(hapd, buf + 16) < 0)
 			reply_len = -1;
 	} else if (os_strncmp(buf, "TEST_ALLOC_FAIL ", 16) == 0) {
-		if (hostapd_ctrl_test_alloc_fail(hapd, buf + 16) < 0)
+		if (testing_set_fail_pattern(true, buf + 16) < 0)
 			reply_len = -1;
 	} else if (os_strcmp(buf, "GET_ALLOC_FAIL") == 0) {
-		reply_len = hostapd_ctrl_get_alloc_fail(hapd, reply,
-							reply_size);
+		reply_len = testing_get_fail_pattern(true, reply, reply_size);
 	} else if (os_strncmp(buf, "TEST_FAIL ", 10) == 0) {
-		if (hostapd_ctrl_test_fail(hapd, buf + 10) < 0)
+		if (testing_set_fail_pattern(false, buf + 10) < 0)
 			reply_len = -1;
 	} else if (os_strcmp(buf, "GET_FAIL") == 0) {
-		reply_len = hostapd_ctrl_get_fail(hapd, reply, reply_size);
+		reply_len = testing_get_fail_pattern(false, reply, reply_size);
 	} else if (os_strncmp(buf, "RESET_PN ", 9) == 0) {
 		if (hostapd_ctrl_reset_pn(hapd, buf + 9) < 0)
 			reply_len = -1;
diff --git a/src/utils/os.h b/src/utils/os.h
index 21ba5c3ff..210d74c10 100644
--- a/src/utils/os.h
+++ b/src/utils/os.h
@@ -669,12 +669,20 @@ int os_exec(const char *program, const char *arg, int wait_completion);
 #if defined(WPA_TRACE_BFD) && defined(CONFIG_TESTING_OPTIONS)
 #define TEST_FAIL() testing_test_fail()
 int testing_test_fail(void);
-extern char wpa_trace_fail_func[256];
-extern unsigned int wpa_trace_fail_after;
-extern char wpa_trace_test_fail_func[256];
-extern unsigned int wpa_trace_test_fail_after;
+int testing_set_fail_pattern(bool is_alloc, char *patterns);
+int testing_get_fail_pattern(bool is_alloc, char *buf, size_t buflen);
 #else
 #define TEST_FAIL() 0
+static inline int testing_set_fail_pattern(bool is_alloc, char *patterns)
+{
+	return -1;
+}
+
+static inline int testing_get_fail_pattern(bool is_alloc, char *buf,
+					   size_t buflen)
+{
+	return -1;
+}
 #endif
 
 #endif /* OS_H */
diff --git a/src/utils/os_unix.c b/src/utils/os_unix.c
index 258deef9d..6fa366415 100644
--- a/src/utils/os_unix.c
+++ b/src/utils/os_unix.c
@@ -540,8 +540,8 @@ void * os_memdup(const void *src, size_t len)
 #ifdef WPA_TRACE
 
 #if defined(WPA_TRACE_BFD) && defined(CONFIG_TESTING_OPTIONS)
-char wpa_trace_fail_func[256] = { 0 };
-unsigned int wpa_trace_fail_after;
+static char wpa_trace_fail_func[256] = { 0 };
+static unsigned int wpa_trace_fail_after;
 
 static int testing_fail_alloc(void)
 {
@@ -626,8 +626,8 @@ static int testing_fail_alloc(void)
 }
 
 
-char wpa_trace_test_fail_func[256] = { 0 };
-unsigned int wpa_trace_test_fail_after;
+static char wpa_trace_test_fail_func[256] = { 0 };
+static unsigned int wpa_trace_test_fail_after;
 
 int testing_test_fail(void)
 {
@@ -697,6 +697,54 @@ int testing_test_fail(void)
 	return 0;
 }
 
+
+int testing_set_fail_pattern(bool is_alloc, char *patterns)
+{
+#ifdef WPA_TRACE_BFD
+	char *pos;
+
+	if (is_alloc) {
+		wpa_trace_fail_after = atoi(patterns);
+		pos = os_strchr(patterns, ':');
+		if (pos) {
+			pos++;
+			os_strlcpy(wpa_trace_fail_func, pos,
+				   sizeof(wpa_trace_fail_func));
+		} else {
+			wpa_trace_fail_after = 0;
+		}
+	} else {
+		wpa_trace_test_fail_after = atoi(patterns);
+		pos = os_strchr(patterns, ':');
+		if (pos) {
+			pos++;
+			os_strlcpy(wpa_trace_test_fail_func, pos,
+				   sizeof(wpa_trace_test_fail_func));
+		} else {
+			wpa_trace_test_fail_after = 0;
+		}
+	}
+
+	return 0;
+#else /* WPA_TRACE_BFD */
+	return -1;
+#endif /* WPA_TRACE_BFD */
+}
+
+
+int testing_get_fail_pattern(bool is_alloc, char *buf, size_t buflen)
+{
+#ifdef WPA_TRACE_BFD
+	if (is_alloc)
+		return os_snprintf(buf, buflen, "%u:%s", wpa_trace_fail_after,
+				   wpa_trace_fail_func);
+	return os_snprintf(buf, buflen, "%u:%s", wpa_trace_test_fail_after,
+			   wpa_trace_test_fail_func);
+#else /* WPA_TRACE_BFD */
+	return -1;
+#endif /* WPA_TRACE_BFD */
+}
+
 #else
 
 static inline int testing_fail_alloc(void)
diff --git a/wpa_supplicant/ctrl_iface.c b/wpa_supplicant/ctrl_iface.c
index a68802e49..b716fa774 100644
--- a/wpa_supplicant/ctrl_iface.c
+++ b/wpa_supplicant/ctrl_iface.c
@@ -10134,72 +10134,6 @@ done:
 }
 
 
-static int wpas_ctrl_test_alloc_fail(struct wpa_supplicant *wpa_s, char *cmd)
-{
-#ifdef WPA_TRACE_BFD
-	char *pos;
-
-	wpa_trace_fail_after = atoi(cmd);
-	pos = os_strchr(cmd, ':');
-	if (pos) {
-		pos++;
-		os_strlcpy(wpa_trace_fail_func, pos,
-			   sizeof(wpa_trace_fail_func));
-	} else {
-		wpa_trace_fail_after = 0;
-	}
-	return 0;
-#else /* WPA_TRACE_BFD */
-	return -1;
-#endif /* WPA_TRACE_BFD */
-}
-
-
-static int wpas_ctrl_get_alloc_fail(struct wpa_supplicant *wpa_s,
-				    char *buf, size_t buflen)
-{
-#ifdef WPA_TRACE_BFD
-	return os_snprintf(buf, buflen, "%u:%s", wpa_trace_fail_after,
-			   wpa_trace_fail_func);
-#else /* WPA_TRACE_BFD */
-	return -1;
-#endif /* WPA_TRACE_BFD */
-}
-
-
-static int wpas_ctrl_test_fail(struct wpa_supplicant *wpa_s, char *cmd)
-{
-#ifdef WPA_TRACE_BFD
-	char *pos;
-
-	wpa_trace_test_fail_after = atoi(cmd);
-	pos = os_strchr(cmd, ':');
-	if (pos) {
-		pos++;
-		os_strlcpy(wpa_trace_test_fail_func, pos,
-			   sizeof(wpa_trace_test_fail_func));
-	} else {
-		wpa_trace_test_fail_after = 0;
-	}
-	return 0;
-#else /* WPA_TRACE_BFD */
-	return -1;
-#endif /* WPA_TRACE_BFD */
-}
-
-
-static int wpas_ctrl_get_fail(struct wpa_supplicant *wpa_s,
-				    char *buf, size_t buflen)
-{
-#ifdef WPA_TRACE_BFD
-	return os_snprintf(buf, buflen, "%u:%s", wpa_trace_test_fail_after,
-			   wpa_trace_test_fail_func);
-#else /* WPA_TRACE_BFD */
-	return -1;
-#endif /* WPA_TRACE_BFD */
-}
-
-
 static void wpas_ctrl_event_test_cb(void *eloop_ctx, void *timeout_ctx)
 {
 	struct wpa_supplicant *wpa_s = eloop_ctx;
@@ -12886,15 +12820,15 @@ char * wpa_supplicant_ctrl_iface_process(struct wpa_supplicant *wpa_s,
 		if (wpas_ctrl_iface_data_test_frame(wpa_s, buf + 16) < 0)
 			reply_len = -1;
 	} else if (os_strncmp(buf, "TEST_ALLOC_FAIL ", 16) == 0) {
-		if (wpas_ctrl_test_alloc_fail(wpa_s, buf + 16) < 0)
+		if (testing_set_fail_pattern(true, buf + 16) < 0)
 			reply_len = -1;
 	} else if (os_strcmp(buf, "GET_ALLOC_FAIL") == 0) {
-		reply_len = wpas_ctrl_get_alloc_fail(wpa_s, reply, reply_size);
+		reply_len = testing_get_fail_pattern(true, reply, reply_size);
 	} else if (os_strncmp(buf, "TEST_FAIL ", 10) == 0) {
-		if (wpas_ctrl_test_fail(wpa_s, buf + 10) < 0)
+		if (testing_set_fail_pattern(false, buf + 10) < 0)
 			reply_len = -1;
 	} else if (os_strcmp(buf, "GET_FAIL") == 0) {
-		reply_len = wpas_ctrl_get_fail(wpa_s, reply, reply_size);
+		reply_len = testing_get_fail_pattern(false, reply, reply_size);
 	} else if (os_strncmp(buf, "EVENT_TEST ", 11) == 0) {
 		if (wpas_ctrl_event_test(wpa_s, buf + 11) < 0)
 			reply_len = -1;