1 files changed, 60 insertions, 0 deletions
diff --git a/tests/src/test_memory.c b/tests/src/test_memory.c
new file mode 100644
index 00000000000..ac9dde61636
--- /dev/null
+++ b/tests/src/test_memory.c
@@ -0,0 +1,60 @@
+/**
+ * \file memory.c
+ *
+ * \brief   Helper functions related to testing memory management.
+ */
+
+/*
+ *  Copyright The Mbed TLS Contributors
+ *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
+ */
+
+#include <test/helpers.h>
+#include <test/macros.h>
+#include <test/memory.h>
+
+#if defined(MBEDTLS_TEST_MEMORY_CAN_POISON)
+#include <sanitizer/asan_interface.h>
+#include <stdint.h>
+#endif
+
+#if defined(MBEDTLS_TEST_MEMORY_CAN_POISON)
+
+_Thread_local unsigned int mbedtls_test_memory_poisoning_count = 0;
+
+static void align_for_asan(const unsigned char **p_ptr, size_t *p_size)
+{
+    uintptr_t start = (uintptr_t) *p_ptr;
+    uintptr_t end = start + (uintptr_t) *p_size;
+    /* ASan can only poison regions with 8-byte alignment, and only poisons a
+     * region if it's fully within the requested range. We want to poison the
+     * whole requested region and don't mind a few extra bytes. Therefore,
+     * align start down to an 8-byte boundary, and end up to an 8-byte
+     * boundary. */
+    start = start & ~(uintptr_t) 7;
+    end = (end + 7) & ~(uintptr_t) 7;
+    *p_ptr = (const unsigned char *) start;
+    *p_size = end - start;
+}
+
+void mbedtls_test_memory_poison(const unsigned char *ptr, size_t size)
+{
+    if (mbedtls_test_memory_poisoning_count == 0) {
+        return;
+    }
+    if (size == 0) {
+        return;
+    }
+    align_for_asan(&ptr, &size);
+    __asan_poison_memory_region(ptr, size);
+}
+
+void mbedtls_test_memory_unpoison(const unsigned char *ptr, size_t size)
+{
+    if (size == 0) {
+        return;
+    }
+    align_for_asan(&ptr, &size);
+    __asan_unpoison_memory_region(ptr, size);
+}
+#endif /* Memory poisoning */