linux-kernel - Re: [PATCH] watchdog: iTCO_wdt: Fix detection of SMI-off case

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]

Message-ID: <1444efd5-b778-949b-34e8-99d2541350e9@siemens.com>
Date:   Fri, 20 Aug 2021 15:45:06 +0200
From:   Jan Kiszka <jan.kiszka@...mens.com>
To:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>
Cc:     linux-watchdog@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Christian Storm <christian.storm@...mens.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Mantas Mikulėnas <grawity@...il.com>
Subject: Re: [PATCH] watchdog: iTCO_wdt: Fix detection of SMI-off case

On 26.07.21 13:46, Jan Kiszka wrote:
> From: Jan Kiszka <jan.kiszka@...mens.com>
> 
> Obviously, the test needs to run against the register content, not its
> address.
> 
> Fixes: cb011044e34c ("watchdog: iTCO_wdt: Account for rebooting on second timeout")
> Reported-by: Mantas Mikulėnas <grawity@...il.com>
> Signed-off-by: Jan Kiszka <jan.kiszka@...mens.com>
> ---
>  drivers/watchdog/iTCO_wdt.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/watchdog/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c
> index b3f604669e2c..643c6c2d0b72 100644
> --- a/drivers/watchdog/iTCO_wdt.c
> +++ b/drivers/watchdog/iTCO_wdt.c
> @@ -362,7 +362,7 @@ static int iTCO_wdt_set_timeout(struct watchdog_device *wd_dev, unsigned int t)
>  	 * Otherwise, the BIOS generally reboots when the SMI triggers.
>  	 */
>  	if (p->smi_res &&
> -	    (SMI_EN(p) & (TCO_EN | GBL_SMI_EN)) != (TCO_EN | GBL_SMI_EN))
> +	    (inl(SMI_EN(p)) & (TCO_EN | GBL_SMI_EN)) != (TCO_EN | GBL_SMI_EN))
>  		tmrval /= 2;
>  
>  	/* from the specs: */
> 

Ping, this is still missing in master. Stable kernels had the revert,
but 5.14 will need this.

Jan

-- 
Siemens AG, T RDA IOT
Corporate Competence Center Embedded Linux