linux-kernel - Re: [PATCH v4 06/10] watchdog/hpwdt: condition early return of NMI handler on iLO5

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: <13cbc00b-59a2-b6bb-88c1-bd66c3bc5c21@roeck-us.net>
Date:   Sun, 25 Feb 2018 15:48:59 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Jerry Hoemann <jerry.hoemann@....com>, wim@...ux-watchdog.org
Cc:     linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
        rwright@....com, maurice.a.saldivar@....com, mingo@...nel.org,
        marcus.folkesson@...il.com
Subject: Re: [PATCH v4 06/10] watchdog/hpwdt: condition early return of NMI
 handler on iLO5

On 02/25/2018 01:32 PM, Jerry Hoemann wrote:
> Modify prior change to not claim an NMI unless originated
> from iLO to apply only to iLO5 and later going forward.
> This restores hpwdt traditional behavior of calling panic
> if the NMI is NMI_IO_CHECK, NMI_SERR, or NMI_UNKNOWN for
> legacy hardware.
> 
> Signed-off-by: Jerry Hoemann <jerry.hoemann@....com>
> ---
>   drivers/watchdog/hpwdt.c | 6 +++++-
>   1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
> index 1a18326bc99d..e60c689ebdb2 100644
> --- a/drivers/watchdog/hpwdt.c
> +++ b/drivers/watchdog/hpwdt.c
> @@ -32,6 +32,7 @@
>   #define HPWDT_MAX_TIMER			TICKS_TO_SECS(65535)
>   #define DEFAULT_MARGIN			30
>   
> +static bool iLO5;
>   static unsigned int soft_margin = DEFAULT_MARGIN;	/* in seconds */
>   static unsigned int reload;			/* the computed soft_margin */
>   static bool nowayout = WATCHDOG_NOWAYOUT;
> @@ -121,7 +122,7 @@ static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs)
>   		"3. OA Forward Progress Log\n"
>   		"4. iLO Event Log";
>   
> -	if ((ulReason == NMI_UNKNOWN) && mynmi)
> +	if (iLO5 && ulReason == NMI_UNKNOWN && mynmi)
>   		return NMI_DONE;
>   
>   	if (allow_kdump)
> @@ -279,6 +280,9 @@ static int hpwdt_init_one(struct pci_dev *dev,
>   			", timer margin: %d seconds (nowayout=%d).\n",
>   			HPWDT_VERSION, hpwdt_dev.timeout, nowayout);
>   
> +	if (dev->subsystem_vendor == PCI_VENDOR_ID_HP_3PAR)
> +		iLO5 = 1;

Hyper-nitpick:
		iLO5 = true;

I have seen 0day warnings because of that, so it is useful to avoid bool/int
mixups.

Thanks,
Guenter

> +
>   	return 0;
>   
>   error_wd_register:
>