linux-kernel - Re: Fw: Badness around put

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Date:	Fri, 27 Jan 2012 18:25:08 +0000
From:	David Howells <dhowells@...hat.com>
To:	Robert Święcki <robert@...ecki.net>
Cc:	dhowells@...hat.com, Serge Hallyn <serge.hallyn@...onical.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Fw: Badness around put_cred()


One thing you could try doing is making do_notify_resume() check the credential
subscriptions on the process as it's about to resume userspace.  The following
assertions both ought to hold:

	BUG_ON(current->cred != current->real_cred);
	BUG_ON(atomic_read(current->cred->usage) >= 2);

And then set TIF_NOTIFY_RESUME in put_cred() and get_new_cred().

David
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