[PATCH] for 2.6.16, disable unshare_vm()

[Oleg Nesterov]

sys_unshare() does mmput(new_mm). This is not enough
if we have mm->core_waiters. This patch is a temporary
fix for soon to be released 2.6.16.

Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>

--- MM/kernel/fork.c~	2006-03-18 23:15:13.000000000 +0300
+++ MM/kernel/fork.c	2006-03-18 23:15:56.000000000 +0300
@@ -1512,9 +1512,7 @@ static int unshare_vm(unsigned long unsh
 
 	if ((unshare_flags & CLONE_VM) &&
 	    (mm && atomic_read(&mm->mm_users) > 1)) {
-		*new_mmp = dup_mm(current);
-		if (!*new_mmp)
-			return -ENOMEM;
+		return -EINVAL;
 	}
 
 	return 0;
-
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