linux-kernel - Re: linux/kernel/irq/chip.c IRQ disable, shutdown bug

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:	Sat, 23 Feb 2008 00:07:17 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Hennerich, Michael" <Michael.Hennerich@...log.com>
Cc:	<linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: linux/kernel/irq/chip.c IRQ disable, shutdown bug

On Fri, 15 Feb 2008 14:10:18 -0000 "Hennerich, Michael" <Michael.Hennerich@...log.com> wrote:

> free_irq() does not disable/mask the irq, in case disable or shutdown in struct irq_chip is left uninitilazied.
> 
> /**
>  * struct irq_chip - hardware interrupt chip descriptor
>  *
>  * @name:		name for /proc/interrupts
>  * @startup:		start up the interrupt (defaults to ->enable if NULL)
>  * @shutdown:		shut down the interrupt (defaults to ->disable if NULL)
>  * @enable:		enable the interrupt (defaults to chip->unmask if NULL)
>  * @disable:		disable the interrupt (defaults to chip->mask if NULL)
> 
> 
> According to linux/irq.h struct irq_chip information,
> chip->disable should default to chip->mask if NULL.
> However irq_chip_set_defaults(struct irq_chip *chip) will set it to default_disable a empty function.
> 
> 
> Looking through various architectures, it's pretty common that disable and shutdown is NULL.
> So this bug affects many architectures.
> 
> This patch fixes the issue.
> 

Please send a Signed-off-by: for this work, as per
Documentation/SubmittingPatches, thanks.


> Index: irq/chip.c
> ===================================================================
> --- irq/chip.c  (revision 4276)
> +++ irq/chip.c  (working copy)

Please prepare future patches in `patch -p1' form.  This should have been

> --- a/kernel/irq/chip.c
> +++ a/kernel/irq/chip.c


> @@ -233,6 +233,10 @@
>   */
>  static void default_disable(unsigned int irq)
>  {
> +       struct irq_desc *desc = irq_desc + irq;
> +
> +       desc->chip->mask(irq);
> +       desc->status |= IRQ_MASKED;
>  }
> 
>  /*

Ingo, Thomas: ack?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/