Attacker Value
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User Interaction
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Privileges Required
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0

CVE-2024-50196

Disclosure Date: November 08, 2024
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Description

In the Linux kernel, the following vulnerability has been resolved:

pinctrl: ocelot: fix system hang on level based interrupts

The current implementation only calls chained_irq_enter() and
chained_irq_exit() if it detects pending interrupts.

for (i = 0; i < info->stride; i++) {
	uregmap_read(info->map, id_reg + 4 * i, &reg);
	if (!reg)
		continue;

	chained_irq_enter(parent_chip, desc);

However, in case of GPIO pin configured in level mode and the parent
controller configured in edge mode, GPIO interrupt might be lowered by the
hardware. In the result, if the interrupt is short enough, the parent
interrupt is still pending while the GPIO interrupt is cleared;
chained_irq_enter() never gets called and the system hangs trying to
service the parent interrupt.

Moving chained_irq_enter() and chained_irq_exit() outside the for loop
ensures that they are called even when GPIO interrupt is lowered by the
hardware.

The similar code with chained_irq_enter() / chained_irq_exit() functions
wrapping interrupt checking loop may be found in many other drivers:

grep -r -A 10 chained_irq_enter drivers/pinctrl

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CVSS V3 Severity and Metrics
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Impact Score:
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Exploitability Score:
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Vector:
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Attack Vector (AV):
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Attack Complexity (AC):
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Privileges Required (PR):
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User Interaction (UI):
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Confidentiality (C):
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Integrity (I):
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General Information

Vendors

  • Linux

Products

  • Linux
Technical Analysis