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-rw-r--r--nptl/allocatestack.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/nptl/allocatestack.c b/nptl/allocatestack.c
index 343dd683d6..02de7f0ed7 100644
--- a/nptl/allocatestack.c
+++ b/nptl/allocatestack.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
@@ -661,10 +661,16 @@ __deallocate_stack (struct pthread *pd)
}
+extern void *__libc_stack_end;
+
int
internal_function
-__make_stacks_executable (void)
+__make_stacks_executable (void **stack_endp)
{
+ /* Challenge the caller. */
+ if (*stack_endp != __libc_stack_end)
+ return EPERM;
+
#ifdef NEED_SEPARATE_REGISTER_STACK
const size_t pagemask = ~(__getpagesize () - 1);
#endif
@@ -702,7 +708,7 @@ __make_stacks_executable (void)
lll_unlock (stack_cache_lock);
if (err == 0)
- err = _dl_make_stack_executable ();
+ err = _dl_make_stack_executable (stack_endp);
return err;
}