int
internal_function
_dl_make_stack_executable (void **stack_endp)
{
/* This gives us the highest/lowest page that needs to be changed. */
uintptr_t page = ((uintptr_t) *stack_endp
& -(intptr_t) GLRO(dl_pagesize));
int result = 0;
/* Challenge the caller. */
if (__builtin_expect (__check_caller (RETURN_ADDRESS (0),
allow_ldso|allow_libpthread) != 0, 0)
|| __builtin_expect (*stack_endp != __libc_stack_end, 0))
return EPERM;
if (__builtin_expect (__mprotect ((void *) page, GLRO(dl_pagesize),
__stack_prot) == 0, 1))
goto return_success;
result = errno;
goto out;
return_success:
/* Clear the address. */
*stack_endp = NULL;
/* Remember that we changed the permission. */
GL(dl_stack_flags) |= PF_X;
out:
#ifdef check_consistency
check_consistency ();
#endif
return result;
}
int
internal_function
_dl_make_stack_executable (void **stack_endp)
{
/* This gives us the highest/lowest page that needs to be changed. */
uintptr_t page = ((uintptr_t) *stack_endp
& -(intptr_t) GLRO(dl_pagesize));
int result = 0;
/* Challenge the caller. */
if (__builtin_expect (__check_caller (RETURN_ADDRESS (0),
allow_ldso|allow_libpthread) != 0, 0)
|| __builtin_expect (*stack_endp != __libc_stack_end, 0))
return EPERM;
/* Newer Linux kernels support a flag to make our job easy. */
#if defined PROT_GROWSDOWN || defined PROT_GROWSUP
# if __ASSUME_PROT_GROWSUPDOWN == 0
static bool no_growsupdown;
if (! no_growsupdown)
# endif
{
if (__builtin_expect (__mprotect ((void *) page, GLRO(dl_pagesize),
__stack_prot) == 0, 1))
goto return_success;
# if __ASSUME_PROT_GROWSUPDOWN == 0
if (errno == EINVAL)
no_growsupdown = true;
else
# endif
{
result = errno;
goto out;
}
}
#endif
/* There is always a hole in the address space below the bottom of the
stack. So when we make an mprotect call that starts below the bottom
of the stack, it will include the hole and fail with ENOMEM.
We start with a random guess at how deep the stack might have gotten
so as to have extended the GROWSDOWN mapping to lower pages. */
#if __ASSUME_PROT_GROWSUPDOWN == 0
size_t size = GLRO(dl_pagesize) * 8;
# if _STACK_GROWS_DOWN
page = page + GLRO(dl_pagesize) - size;
while (1)
{
if (__mprotect ((void *) page, size,
__stack_prot & ~PROT_GROWSDOWN) == 0)
/* We got this chunk changed; loop to do another chunk below. */
page -= size;
else
{
if (errno != ENOMEM) /* Unexpected failure mode. */
{
result = errno;
goto out;
}
if (size == GLRO(dl_pagesize))
/* We just tried to mprotect the top hole page and failed.
We are done. */
break;
/* Our mprotect call failed because it started below the lowest
stack page. Try again on just the top half of that region. */
size /= 2;
page += size;
}
}
# elif _STACK_GROWS_UP
while (1)
{
if (__mprotect ((void *) page, size, __stack_prot & ~PROT_GROWSUP) == 0)
/* We got this chunk changed; loop to do another chunk below. */
page += size;
else
{
if (errno != ENOMEM) /* Unexpected failure mode. */
{
result = errno;
goto out;
}
if (size == GLRO(dl_pagesize))
/* We just tried to mprotect the lowest hole page and failed.
We are done. */
break;
/* Our mprotect call failed because it extended past the highest
stack page. Try again on just the bottom half of that region. */
size /= 2;
}
}
# else
# error "Define either _STACK_GROWS_DOWN or _STACK_GROWS_UP"
# endif
#endif
return_success:
/* Clear the address. */
*stack_endp = NULL;
/* Remember that we changed the permission. */
GL(dl_stack_flags) |= PF_X;
out:
#ifdef check_consistency
check_consistency ();
#endif
return result;
}
