linux-kernel - Re: [PATCH v4 2/3] VT: Add KDFONTINFO ioctl

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Message-ID: <79bc6166-8a6c-4329-86a0-2f150c60aed6@kernel.org>
Date: Thu, 11 Apr 2024 05:53:48 +0200
From: Jiri Slaby <jirislaby@...nel.org>
To: Alexey Gladkov <legion@...nel.org>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 LKML <linux-kernel@...r.kernel.org>, kbd@...ts.linux.dev,
 linux-api@...r.kernel.org, linux-fbdev@...r.kernel.org,
 linux-serial@...r.kernel.org, Helge Deller <deller@....de>
Subject: Re: [PATCH v4 2/3] VT: Add KDFONTINFO ioctl

On 10. 04. 24, 18:36, Alexey Gladkov wrote:
> On Wed, Apr 03, 2024 at 07:05:14AM +0200, Jiri Slaby wrote:
>> First, there was no need to send this v4 so quickly. Provided we have
>> not settled in v3... This makes the review process painful.
>>
>> And then:
>>
>> On 02. 04. 24, 19:50, Alexey Gladkov wrote:
>>> Each driver has its own restrictions on font size. There is currently no
>>> way to understand what the requirements are. The new ioctl allows
>>> userspace to get the minimum and maximum font size values.
>>>
>>> Acked-by: Helge Deller <deller@....de>
>>> Signed-off-by: Alexey Gladkov <legion@...nel.org>
>> ...
>>> --- a/drivers/tty/vt/vt_ioctl.c
>>> +++ b/drivers/tty/vt/vt_ioctl.c
>>> @@ -479,6 +479,17 @@ static int vt_k_ioctl(struct tty_struct *tty, unsigned int cmd,
>>>    		break;
>>>    	}
>>>    
>>> +	case KDFONTINFO: {
>>> +		struct console_font_info fnt_info;
>>> +
>>> +		ret = con_font_info(vc, &fnt_info);
>>> +		if (ret)
>>> +			return ret;
>>> +		if (copy_to_user(up, &fnt_info, sizeof(fnt_info)))
>>
>> sizeof, I already commented.
> 
> I'm not sure I understand. sizeof(*up), but 'up' is 'void __user *up'.

I don't know what I saw/was thinking previously, ignore this one :).

thanks,
-- 
js
suse labs