Self-modifying code, Function pointers & { Safety, Security}

Hi,


        We are used to separation of code from data at the language level.
        However, two features disupt security :


        i) self-modifying code


          i.e. writing to code space


        ii) functions residing in data space


Are there safety & security solutions possible for the above two
safety, security holes ?


Sincerely,
Seima Rao.
[The major reasons for self-modifying code historically were for
address modification for indexing and subroutine returns. Index
registers and indirect addressing provide instruction modification as
the instruction is executed, making those modifications go away. For
runtime code generation, there have been a variety of approaches to
controlled addition of code to running programs, which I could dig up
if people care. -John]

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