src/tests/klaar/read-bad-buf.c


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/* Passes an semingly valid pointer to the read system call.
   The pointer will however span invalid pages.
   The process must be terminated with -1 exit code.
   (klaar@ida)
*/

#include <syscall.h>
#include "tests/lib.h"
#include "tests/main.h"

char global; /* allocated with process image */

void
test_main (void) 
{
  int handle;
  char local; /* allocated on process stack */
  
  CHECK ((handle = open ("sample.txt")) > 1, "open \"sample.txt\"");

  /* buffer will start and end at valid addresses ... */
  read (handle, (char *)&global, &local - &global + 1);
  fail ("should not have survived read()");
}