linux-kernel - Re: [PATCH] irqchip/apple-aic: fix irq

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 20 Aug 2021 13:22:18 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Hector Martin <marcan@...can.st>, Sven Peter <sven@...npeter.dev>
Cc:     Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] irqchip/apple-aic: fix irq_disable from within irq handlers

On Thu, 12 Aug 2021 12:09:42 +0200, Sven Peter wrote:
> When disable_irq_nosync for an interrupt is called from within its
> interrupt handler, this interrupt is only marked as disabled with the
> intention to mask it when it triggers again.
> The AIC hardware however automatically masks the interrupt when it is read.
> aic_irq_eoi then unmasks it again if it's not disabled *and* not masked.
> This results in a state mismatch between the hardware state and the
> state kept in irq_data: The hardware interrupt is masked but
> IRQD_IRQ_MASKED is not set. Any further calls to unmask_irq will directly
> return and the interrupt can never be enabled again.
> 
> [...]

Applied to irq/misc-5.15, thanks!

[1/1] irqchip/apple-aic: fix irq_disable from within irq handlers
      commit: 0fb038ba08dba0a5e937b79a67ed9c21ab5b59c5

Cheers,

	M.
-- 
Without deviation from the norm, progress is not possible.