[10570] in bugtraq
Re: Clarification: LD_PRELOAD issue
daemon@ATHENA.MIT.EDU (John Daniele)
Mon May 17 17:29:43 1999
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Message-Id: <003F8373DFAC5035*/c=ca/admd=CONCERT/prmd=kpmg/o=noteServer/s=Daniele/g=John/@MHS>
Date: Sat, 15 May 1999 18:52:53 -0400
Reply-To: John Daniele <JDaniele@KPMG.CA>
From: John Daniele <JDaniele@KPMG.CA>
To: BUGTRAQ@NETSPACE.ORG
/*
* rollover.c
*
* using ptrace() to intercept and modify the return value of a system call
*
* John Daniele
* jdaniele@kpmg.ca
* 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);
}
