[Patch] Fixing the PROCESS_DUP_HANDLE security hole.

[Pierre A. Humblet]

At 12:43 AM 12/4/2004 -0500, Christopher Faylor wrote:
>
>I wrote a simple test case to check this and I don't see it -- on XP.  I
>can't easily run Me anymore.  Does the attached program demonstrate this
>behavior when you run it?  It should re-exec itself every time you hit
>CTRL-C.

That test case has no problem, but the attached one does. 
Use kill -30 pid

Pierre
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/signal.h>

void ouch (int sig)
{
  printf ("got signal %d\n", sig);
  return;
}

int
main (int argc, char **argv)
{
  if (getppid() != 1 && fork())
    exit(0);
  signal (SIGUSR1, ouch);
  while (pause ())
    {
      puts ("execing myself");
      execv (argv[0], argv);
    }
  exit (0);
}