pre:

Unlike Enforcer, Mungwall does not require any special hardware. Mungwall
can run without Enforcer and on non-MMU machines.

Mungwall uses several special 32-bit values to ``mung'' memory which helps
diagnose problems:

   Except when Enforcer is running, Mungwall sets location zero to
   $C0DEDBAD.  Normally, location zero is $00000000.  By putting an odd,
   non-zero value in location zero, any erroneous references to location
   zero are much more likely to show themselves.  For example, a program
   that references  location zero as character array will see a string
   that starts with the ASCII values $C0 $DE $DB $AD, rather than seeing a
   NULL string.

   When Mungwall starts up, it sets all free memory to $ABADCAFE.  If this
   number shows up while an application is running, it is likely that
   someone is referencing memory in the free list.

   When a program allocates memory, Mungwall sets that memory to $DEADF00D
   (Except when allocating memory with MEMF_CLEAR).  When an application
   accidentally accesses its memory before initializing it, the
   application will find the well-known value $DEADF00D rather than some
   random value that happened to be left in memory.

   Mungwall fills deallocated memory with $DEADBEEF, which makes using
   freed memory bugs much more obvious.