diff mbox series

[1/7] genirq/debugfs: Add missing sanity checks to interrupt injection

Message ID 20200306130623.500019114@linutronix.de (mailing list archive)
State Not Applicable, archived
Headers show
Series genirq/PCI: Sanitize interrupt injection | expand

Commit Message

Thomas Gleixner March 6, 2020, 1:03 p.m. UTC
Interrupts cannot be injected when the interrupt is not activated and when
a replay is already in progress.

Fixes: 536e2e34bd00 ("genirq/debugfs: Triggering of interrupts from userspace")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
---
 kernel/irq/debugfs.c |   11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

Comments

Marc Zyngier March 6, 2020, 1:15 p.m. UTC | #1
On 2020-03-06 13:03, Thomas Gleixner wrote:
> Interrupts cannot be injected when the interrupt is not activated and 
> when
> a replay is already in progress.
> 
> Fixes: 536e2e34bd00 ("genirq/debugfs: Triggering of interrupts from 
> userspace")
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> Cc: stable@vger.kernel.org
> ---
>  kernel/irq/debugfs.c |   11 +++++++++--
>  1 file changed, 9 insertions(+), 2 deletions(-)
> 
> --- a/kernel/irq/debugfs.c
> +++ b/kernel/irq/debugfs.c
> @@ -206,8 +206,15 @@ static ssize_t irq_debug_write(struct fi
>  		chip_bus_lock(desc);
>  		raw_spin_lock_irqsave(&desc->lock, flags);
> 
> -		if (irq_settings_is_level(desc) || desc->istate & IRQS_NMI) {
> -			/* Can't do level nor NMIs, sorry */
> +		/*
> +		 * Don't allow injection when the interrupt is:
> +		 *  - Level or NMI type
> +		 *  - not activated
> +		 *  - replaying already
> +		 */
> +		if (irq_settings_is_level(desc) ||
> +		    !irqd_is_activated(&desc->irq_data) ||
> +		    (desc->istate & (IRQS_NMI | IRQS_REPLAY)) {
>  			err = -EINVAL;
>  		} else {
>  			desc->istate |= IRQS_PENDING;

Huh, nice catch.

Acked-by: Marc Zyngier <maz@kernel.org>

         M.
diff mbox series

Patch

--- a/kernel/irq/debugfs.c
+++ b/kernel/irq/debugfs.c
@@ -206,8 +206,15 @@  static ssize_t irq_debug_write(struct fi
 		chip_bus_lock(desc);
 		raw_spin_lock_irqsave(&desc->lock, flags);
 
-		if (irq_settings_is_level(desc) || desc->istate & IRQS_NMI) {
-			/* Can't do level nor NMIs, sorry */
+		/*
+		 * Don't allow injection when the interrupt is:
+		 *  - Level or NMI type
+		 *  - not activated
+		 *  - replaying already
+		 */
+		if (irq_settings_is_level(desc) ||
+		    !irqd_is_activated(&desc->irq_data) ||
+		    (desc->istate & (IRQS_NMI | IRQS_REPLAY)) {
 			err = -EINVAL;
 		} else {
 			desc->istate |= IRQS_PENDING;