1 files changed, 31 insertions, 0 deletions
diff --git a/plat/arm/board/juno/juno_stack_protector.c b/plat/arm/board/juno/juno_stack_protector.c
new file mode 100644
index 00000000..ec0b1fbe
--- /dev/null
+++ b/plat/arm/board/juno/juno_stack_protector.c
@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <arch_helpers.h>
+#include <debug.h>
+#include <utils.h>
+#include "juno_decl.h"
+#include "juno_def.h"
+
+u_register_t plat_get_stack_protector_canary(void)
+{
+	u_register_t c[TRNG_NBYTES / sizeof(u_register_t)];
+	u_register_t ret = 0;
+	size_t i;
+
+	if (juno_getentropy(c, sizeof(c)) != 0) {
+		ERROR("Not enough entropy to initialize canary value\n");
+		panic();
+	}
+
+	/*
+	 * On Juno we get 128-bits of entropy in one round.
+	 * Fuse the values together to form the canary.
+	 */
+	for (i = 0; i < ARRAY_SIZE(c); i++)
+		ret ^= c[i];
+	return ret;
+}