Re: [PATCH] IMA: inconsistent lock state in ima_process_queued_keys

[Mimi Zohar]

On Wed, 2020-01-15 at 19:13 -0800, Lakshmi Ramasubramanian wrote:
> ima_queued_keys() is called from a non-interrupt context, but
> ima_process_queued_keys() may be called from both an interrupt
> context (ima_timer_handler) and non-interrupt context
> (ima_update_policy). Since the spinlock named ima_keys_lock is used
> in both ima_queued_keys() and ima_process_queued_keys(),
> irq version of the spinlock macros, spin_lock_irqsave() and
> spin_unlock_irqrestore(), should be used[1].
> 
> This patch fixes the "inconsistent lock state" issue caused by
> using the non-irq version of the spinlock macros in ima_queue_key()
> and ima_process_queued_keys().
> 
> [1] Documentation/locking/spinlocks.rst
> 
> Signed-off-by: Lakshmi Ramasubramanian <nramas@xxxxxxxxxxxxxxxxxxx>
> Reported-by: syzbot <syzbot+a4a503d7f37292ae1664@xxxxxxxxxxxxxxxxxxxxxxxxx>
> Suggested-by: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
> Fixes: 8f5d2d06f217 ("IMA: Defined timer to free queued keys")
> Fixes: 9fb38e76b5f1 ("IMA: Define workqueue for early boot key measurements")

Thanks!  This patch is now queued in next-integrity-testing.

Mimi