perform size checks on various operations

Signed-off-by: Tavi <tavi@divested.dev>
Co-authored-by: =?UTF-8?q?Christian=20G=C3=B6ttsche?= <cgzones@googlemail.com>

test/memset_valid_mismatched.c

@@ -0,0 +1,13 @@
+#include <stdlib.h>
+#include <string.h>
+
+#include "test_util.h"
+
+OPTNONE int main(void) {
+    char *buffer = malloc(32);
+    if (!buffer) {
+        return 1;
+    }
+    memset(buffer, 'a', 16);
+    return 0;
+}