Commit 2d61b867 authored Mar 18, 2006 by Oleg Nesterov Committed by Linus Torvalds Mar 18, 2006

[PATCH] disable unshare(CLONE_VM) for now



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@tv-sign.ru>
[ Checked with Uli: "I'm not planning to use unshare(CLONE_VM).  It's
  not needed for any functionality planned so far.  What we (as in Red
  Hat) need unshare() for now is the filesystem side." ]
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

parent 265a9285

kernel/fork.c

+1 −3

Original line number	Diff line number	Diff line
		@@ -1478,9 +1478,7 @@ static int unshare_vm(unsigned long unshare_flags, struct mm_struct **new_mmp)

		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;