pidns: fix vfork() after unshare(CLONE_NEWPID)

Commit 8382fcac1b81 ("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@redhat.com>
Reported-by: Colin Walters <walters@redhat.com>
Acked-by: Andy Lutomirski <luto@amacapital.net>
Reviewed-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 3 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index c9eaf2013002..3561391ca450 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1173,10 +1173,11 @@ static struct task_struct *copy_process(unsigned long clone_flags,
                 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);