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How to Avoid Writing Kernel Modules
© 2004 Michael C. Toren

#8

Hijacking functions with `LD_PRELOAD` (II)

Example hijacking getpid(2) to modify the return value:

    pid_t getpid(void)
    {
        return 42;
    }

Compiling and execution:

    $ LD_PRELOAD=./getpid.so bash -c 'echo $$'
    42