linux-kernel - RE: [PATCH] platform/x86: dell-wmi-sysman: Change user experience when Admin/System Password is modified

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Date:   Mon, 28 Jun 2021 09:05:18 +0000
From:   "Ksr, Prasanth" <Prasanth.Ksr@...l.com>
To:     Hans de Goede <hdegoede@...hat.com>,
        Prasanth KSR <kosigiprasanth@...il.com>,
        "dvhart@...radead.org" <dvhart@...radead.org>
CC:     LKML <linux-kernel@...r.kernel.org>,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>,
        "Bharathi, Divya" <Divya.Bharathi@...l.com>
Subject: RE: [PATCH] platform/x86: dell-wmi-sysman: Change user experience
 when Admin/System Password is modified

Hi,


> -----Original Message-----
> From: Hans de Goede <hdegoede@...hat.com>
> Sent: Monday, June 28, 2021 2:32 PM
> To: Prasanth KSR; dvhart@...radead.org
> Cc: LKML; platform-driver-x86@...r.kernel.org; Ksr, Prasanth; Bharathi, Divya
> Subject: Re: [PATCH] platform/x86: dell-wmi-sysman: Change user experience
> when Admin/System Password is modified
> 
> 
> [EXTERNAL EMAIL]
> 
> Hi,
> 
> On 6/28/21 10:49 AM, Prasanth KSR wrote:
> > Whenever user has changed an Admin/System Password using the sysfs,
> > then we are automatically copying the new password to existing
> > password field.
> >
> > Co-developed-by: Divya Bharathi <divya.bharathi@...l.com>
> > Signed-off-by: Divya Bharathi <divya.bharathi@...l.com>
> > Signed-off-by: Prasanth KSR <prasanth.ksr@...l.com>
> 
> Thank you.
> 
> I assume this was tested?  The reason I'm asking because in the Lenovo Think*
> case it turned out that the modified password only becomes active after a reboot,
> so the right thing to do there was to just keep current_password as is.
> 

Yes it is tested and Dell BIOS Admin/System password do not require a reboot to be active.

> Regards,
> 
> Hans
> 
> 
> 
> > ---
> >  .../x86/dell/dell-wmi-sysman/passwordattr-interface.c         | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git
> > a/drivers/platform/x86/dell/dell-wmi-sysman/passwordattr-interface.c
> > b/drivers/platform/x86/dell/dell-wmi-sysman/passwordattr-interface.c
> > index 339a082d6c18..86ec962aace9 100644
> > ---
> > a/drivers/platform/x86/dell/dell-wmi-sysman/passwordattr-interface.c
> > +++ b/drivers/platform/x86/dell/dell-wmi-sysman/passwordattr-interface
> > +++ .c
> > @@ -95,9 +95,9 @@ int set_new_password(const char *password_type,
> > const char *new)
> >
> >  	print_hex_dump_bytes("set new password data: ", DUMP_PREFIX_NONE,
> buffer, buffer_size);
> >  	ret = call_password_interface(wmi_priv.password_attr_wdev, buffer,
> buffer_size);
> > -	/* clear current_password here and use user input from
> wmi_priv.current_password */
> > +	/* on success copy the new password to current password */
> >  	if (!ret)
> > -		memset(current_password, 0, MAX_BUFF);
> > +		strscpy(current_password, new, MAX_BUFF);
> >  	/* explain to user the detailed failure reason */
> >  	else if (ret == -EOPNOTSUPP)
> >  		dev_err(&wmi_priv.password_attr_wdev->dev, "admin password
> must be
> > configured\n");
> >