[patch 002/303] pidns: fix vfork() after unshare(CLONE_NEWPID)

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From: Oleg Nesterov <oleg@xxxxxxxxxx>
Subject: pidns: fix vfork() after unshare(CLONE_NEWPID)

8382fcac ("pidns: Outlaw thread creation after unshare(CLONE_NEWPID)")
nacks CLONE_VM if the forking process unshared pid_ns, this obviously
breaks vfork:

	int main(void)
	{
		assert(unshare(CLONE_NEWUSER | CLONE_NEWPID) == 0);
		assert(vfork() >= 0);
		_exit(0);
		return 0;
	}

fails without this patch.

Change this check to use CLONE_SIGHAND instead.  This also forbids
CLONE_THREAD automatically, and this is what the comment implies.

We could probably even drop CLONE_SIGHAND and use CLONE_THREAD, but it
would be safer to not do this.  The current check denies CLONE_SIGHAND
implicitely and there is no reason to change this.

Eric said "CLONE_SIGHAND is fine.  CLONE_THREAD would be even better. 
Having shared signal handling between two different pid namespaces is the
case that we are fundamentally guarding against."

Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Reported-by: Colin Walters <walters@xxxxxxxxxx>
Acked-by: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Reviewed-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 kernel/fork.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff -puN kernel/fork.c~pidns-fix-vfork-after-unshareclone_newpid kernel/fork.c
--- a/kernel/fork.c~pidns-fix-vfork-after-unshareclone_newpid
+++ a/kernel/fork.c
@@ -1173,10 +1173,11 @@ static struct task_struct *copy_process(
 		return ERR_PTR(-EINVAL);
 
 	/*
-	 * If the new process will be in a different pid namespace
-	 * don't allow the creation of threads.
+	 * If the new process will be in a different pid namespace don't
+	 * allow it to share a thread group or signal handlers with the
+	 * forking task.
 	 */
-	if ((clone_flags & (CLONE_VM|CLONE_NEWPID)) &&
+	if ((clone_flags & (CLONE_SIGHAND | CLONE_NEWPID)) &&
 	    (task_active_pid_ns(current) !=
 	     current->nsproxy->pid_ns_for_children))
 		return ERR_PTR(-EINVAL);
_
--
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