Malloc should fail on too large allocations

This adds a simple test into the builtin stdlib.c implementation of `malloc`.
Also the converter input is now a dependency (in the CMake build).

Author: petr-bauch

regression/cbmc/malloc-too-large/main.c

@@ -0,0 +1,11 @@
+#include <assert.h>
+#include <stdint.h>
+#include <stdlib.h>
+
+int main()
+{
+  int *p = malloc(SIZE_MAX);
+  assert(p);
+
+  return 0;
+}

regression/cbmc/malloc-too-large/test.desc

@@ -0,0 +1,9 @@
+CORE
+main.c
+
+^EXIT=10$
+^SIGNAL=0$
+^\[main.assertion.\d+\] line \d+ assertion p: FAILURE$
+^VERIFICATION FAILED$
+--
+^warning: ignoring

src/ansi-c/CMakeLists.txt

@@ -13,7 +13,7 @@ endforeach()
 
 add_custom_command(OUTPUT "${CMAKE_CURRENT_BINARY_DIR}/cprover_library.inc"
     COMMAND converter < ${converter_input_path} > "${CMAKE_CURRENT_BINARY_DIR}/cprover_library.inc"
-    DEPENDS converter
+    DEPENDS converter ${converter_input_path}
 )
 
 add_executable(file_converter file_converter.cpp)

src/ansi-c/library/stdlib.c

@@ -115,6 +115,9 @@ inline void *malloc(__CPROVER_size_t malloc_size)
   // realistically, malloc may return NULL,
   // and __CPROVER_allocate doesn't, but no one cares
   __CPROVER_HIDE:;
+  // 8 is the default object bits for ANSI-C and C++
+  if (malloc_size >= ((__CPROVER_size_t)1<<(64-8)))
+    return (void*)0;
   void *malloc_res;
   malloc_res = __CPROVER_allocate(malloc_size, 0);