linux-kernel - Re: [PATCH] platform/x86: think-lmi: Fix password opcode ordering for workstations

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Message-ID: <dfb993c6-0e10-bc70-e8e9-a88651863a27@linux.intel.com>
Date: Fri, 9 Feb 2024 17:34:34 +0200 (EET)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Mark Pearson <mpearson-lenovo@...ebb.ca>
cc: Hans de Goede <hdegoede@...hat.com>, platform-driver-x86@...r.kernel.org, 
    LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] platform/x86: think-lmi: Fix password opcode ordering
 for workstations

On Fri, 9 Feb 2024, Mark Pearson wrote:

> The Lenovo workstations require the password opcode to be run before
> the attribute value is changed (if Admin password is enabled).
> 
> Tested on some Thinkpads to confirm they are OK with this order too.
> 
> Signed-off-by: Mark Pearson <mpearson-lenovo@...ebb.ca>

Would a Fixes tag be appropriate here?

-- 
 i.

> ---
>  drivers/platform/x86/think-lmi.c | 20 +++++++++++---------
>  1 file changed, 11 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/platform/x86/think-lmi.c b/drivers/platform/x86/think-lmi.c
> index 3a396b763c49..ce3e08815a8e 100644
> --- a/drivers/platform/x86/think-lmi.c
> +++ b/drivers/platform/x86/think-lmi.c
> @@ -1009,7 +1009,16 @@ static ssize_t current_value_store(struct kobject *kobj,
>  		 * Note - this sets the variable and then the password as separate
>  		 * WMI calls. Function tlmi_save_bios_settings will error if the
>  		 * password is incorrect.
> +		 * Workstation's require the opcode to be set before changing the
> +		 * attribute.
>  		 */
> +		if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password[0]) {
> +			ret = tlmi_opcode_setting("WmiOpcodePasswordAdmin",
> +						  tlmi_priv.pwd_admin->password);
> +			if (ret)
> +				goto out;
> +		}
> +
>  		set_str = kasprintf(GFP_KERNEL, "%s,%s;", setting->display_name,
>  				    new_setting);
>  		if (!set_str) {
> @@ -1021,17 +1030,10 @@ static ssize_t current_value_store(struct kobject *kobj,
>  		if (ret)
>  			goto out;
>  
> -		if (tlmi_priv.save_mode == TLMI_SAVE_BULK) {
> +		if (tlmi_priv.save_mode == TLMI_SAVE_BULK)
>  			tlmi_priv.save_required = true;
> -		} else {
> -			if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password[0]) {
> -				ret = tlmi_opcode_setting("WmiOpcodePasswordAdmin",
> -							  tlmi_priv.pwd_admin->password);
> -				if (ret)
> -					goto out;
> -			}
> +		else
>  			ret = tlmi_save_bios_settings("");
> -		}
>  	} else { /* old non-opcode based authentication method (deprecated) */
>  		if (tlmi_priv.pwd_admin->valid && tlmi_priv.pwd_admin->password[0]) {
>  			auth_str = kasprintf(GFP_KERNEL, "%s,%s,%s;",
>