skas-prevent-tail-call-cont


Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Index: linux-2.6.18/arch/i386/kernel/ldt.c
===================================================================
--- linux-2.6.18.orig/arch/i386/kernel/ldt.c
+++ linux-2.6.18/arch/i386/kernel/ldt.c
@@ -259,5 +259,9 @@ int __modify_ldt(struct mm_struct * mm, 
 
 asmlinkage int sys_modify_ldt(int func, void __user *ptr, unsigned long bytecount)
 {
-	return __modify_ldt(current->mm, func, ptr, bytecount);
+	int ret = __modify_ldt(current->mm, func, ptr, bytecount);
+	/* A tail call would reorder parameters on the stack and they would then
+	 * be restored at the wrong places. */
+	prevent_tail_call(ret);
+	return ret;
 }
Index: linux-2.6.18/mm/mprotect.c
===================================================================
--- linux-2.6.18.orig/mm/mprotect.c
+++ linux-2.6.18/mm/mprotect.c
@@ -312,5 +312,9 @@ out:
 
 asmlinkage long sys_mprotect(unsigned long start, size_t len, unsigned long prot)
 {
-        return(do_mprotect(current->mm, start, len, prot));
+	long ret = do_mprotect(current->mm, start, len, prot);
+	/* A tail call would reorder parameters on the stack and they would then
+	 * be restored at the wrong places. */
+	prevent_tail_call(ret);
+	return ret;
 }