Allow stack growth so the 'enter' instruction works. Also
fixes problem in compat_sys_kexec_load() which could allocate
more than 128 bytes using compat_alloc_user_space().
Signed-off-by: Chuck Ebbert <[email protected]>
--- 2.6.17-rc6-64.orig/arch/x86_64/mm/fault.c
+++ 2.6.17-rc6-64/arch/x86_64/mm/fault.c
@@ -410,8 +410,10 @@ asmlinkage void __kprobes do_page_fault(
if (!(vma->vm_flags & VM_GROWSDOWN))
goto bad_area;
if (error_code & 4) {
- // XXX: align red zone size with ABI
- if (address + 128 < regs->rsp)
+ /* Allow userspace just enough access below the stack pointer
+ * to let the 'enter' instruction work.
+ */
+ if (address + 65536 + 32 * sizeof(unsigned long) < regs->rsp)
goto bad_area;
}
if (expand_stack(vma, address))
--
Chuck
"You can't read a newspaper if you can't read." --George W. Bush
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