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Assembly (NASM) format, 5 years 7 months old, and 142 hits.

Cody Brocious
Thursday, July 13th, 2006 at 4:48:37pm MDT 

  1. void hotfixer(void *caller,
  2.               void *callee,
  3.               void *new_func) {
  4.   /*                                                                                                               
  5.    * Get the true address of the callee                                                                           
  6.    */
  7.  
  8.   callee -= 8; // XXX: Validate this!                                                                             
  9.                // Should be equal to pop eax+call                                                                 
  10.  
  11.   /*                                                                                                               
  12.    * Check various call instructions                                                                               
  13.    */
  14.   if(*((void **) ((char *) caller) - 4) == callee) {
  15.     /*                                                                                                             
  16.      * Patch new function into place                                                                               
  17.      */
  18.     *((void **) ((char *) caller) - 4) = new_func;
  19.   }
  20. }

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