linux-kernel - [patch 1/7] genirq/debugfs: Add missing sanity checks to interrupt injection

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Message-Id: <20200306130623.500019114@linutronix.de>
Date:   Fri, 06 Mar 2020 14:03:42 +0100
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     Marc Zyngier <maz@...nel.org>, x86@...nel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        Keith Busch <kbusch@...nel.org>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        stable@...r.kernel.org
Subject: [patch 1/7] genirq/debugfs: Add missing sanity checks to interrupt injection

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@...utronix.de>
Cc: stable@...r.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;