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ccharsystem-callsptrace

How to get a char* with ptrace

I am currently developing a tool in which I have to trace a program to know his system calls. For the moment, I am able to get numeric parameters of syscalls but I can't get properly address to the strings.

Here is the way I proceed :

  long addr = ptrace(PTRACE_PEEKDATA, pid, regs.ebx, NULL);
  printf("%s", (char *) &addr);

With that piece of code I can get the beginning of the string (3 or 4 first characters) but the end is corrupted, I don't know why.

Have you got any solution ? Thank you.

Solution

  • Are you sure that you don't want this instead?

    printf("%lX", addr);