linux-kernel - Re: [PATCH] IMA: inconsistent lock state in ima_process_queued

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Message-Id: <1579180232.5857.23.camel@linux.ibm.com>
Date:   Thu, 16 Jan 2020 08:10:32 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>,
        dvyukov@...gle.com, James.Bottomley@...senPartnership.com,
        arnd@...db.de, linux-integrity@...r.kernel.org
Cc:     dhowells@...hat.com, sashal@...nel.org,
        linux-kernel@...r.kernel.org, keyrings@...r.kernel.org,
        linux-crypto@...r.kernel.org
Subject: Re: [PATCH] IMA: inconsistent lock state in ima_process_queued_keys

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@...ux.microsoft.com>
> Reported-by: syzbot <syzbot+a4a503d7f37292ae1664@...kaller.appspotmail.com>
> Suggested-by: Dmitry Vyukov <dvyukov@...gle.com>
> 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