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Issue #11393: limit stack overflow test to 100 MB

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Stop if the stack overflow doesn't occur after allocating 100 MB on the stack.
This commit is contained in:
Victor Stinner 2011-03-31 11:34:08 +02:00
parent 702624ecf7
commit f048075079
2 changed files with 37 additions and 8 deletions
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37
Modules/faulthandler.c
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@ -16,6 +16,9 @@
# define FAULTHANDLER_USER
#endif
/* Allocate at maximum 100 MB of the stack to raise the stack overflow */
#define STACK_OVERFLOW_MAX_SIZE (100*1024*1024)
#define PUTS(fd, str) write(fd, str, strlen(str))
#ifdef HAVE_SIGACTION
@ -742,15 +745,39 @@ faulthandler_fatal_error_py(PyObject *self, PyObject *args)
}
#if defined(HAVE_SIGALTSTACK) && defined(HAVE_SIGACTION)
static PyObject *
faulthandler_stack_overflow(PyObject *self)
void*
stack_overflow(void *min_sp, void *max_sp, size_t *depth)
{
/* allocate 4096 bytes on the stack at each call */
unsigned char buffer[4096];
void *sp = &buffer;
*depth += 1;
if (sp < min_sp || max_sp < sp)
return sp;
buffer[0] = 1;
buffer[4095] = 2;
faulthandler_stack_overflow(self);
return PyLong_FromLong(buffer[0] + buffer[4095]);
buffer[4095] = 0;
return stack_overflow(min_sp, max_sp, depth);
}
static PyObject *
faulthandler_stack_overflow(PyObject *self)
{
size_t depth, size;
void *sp = &depth, *stop;
depth = 0;
stop = stack_overflow(sp - STACK_OVERFLOW_MAX_SIZE,
sp + STACK_OVERFLOW_MAX_SIZE,
&depth);
if (sp < stop)
size = stop - sp;
else
size = sp - stop;
PyErr_Format(PyExc_RuntimeError,
"unable to raise a stack overflow (allocated %zu bytes "
"on the stack, %zu recursive calls)",
size, depth);
return NULL;
}
#endif