Re: Clarification: LD_PRELOAD issue

From: John Daniele (JDanieleat_private)
Date: Sat May 15 1999 - 15:52:53 PDT

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    /*
  * rollover.c
  *
  * using ptrace() to intercept and modify the return value of a system call
  *
  * John Daniele
  * jdanieleat_private
  * VOX: (416) 777-3759
  *
  */

#include <unistd.h>
#include <sys/ptrace.h>

int main(void)
{	
	int ret, x, y;
	pid_t procid;

	if(procid = fork()) {		
		for(;;) {
			x = ptrace(PTRACE_PEEKUSR, procid, 44, 0);
			if(x == 13) {	
				y = ptrace(PTRACE_PEEKUSR, procid, EBX,
0);		
				ptrace(PTRACE_POKEDATA, procid, y,
2175984000);	
			}
			ptrace(PTRACE_SYSCALL, procid, 1, 0);	
		}	
	}	
	ptrace(PTRACE_TRACEME, 0, 1, 0);	
	execl("/bin/date", "/bin/date", NULL, (char *)0);
}

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