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]
Date: Wed, 3 Apr 2024 07:27:55 +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: [RESEND PATCH v3 1/2] VT: Add KDFONTINFO ioctl

On 02. 04. 24, 15:19, Alexey Gladkov wrote:
>>> --- a/include/uapi/linux/kd.h
>>> +++ b/include/uapi/linux/kd.h
..
>>> +struct console_font_info {
>>> +	unsigned int min_width, min_height;	/* minimal font size */
>>> +	unsigned int max_width, max_height;	/* maximum font size */
>>> +	unsigned int flags;			/* KD_FONT_INFO_FLAG_* */
>>
>> This does not look like a well-defined™ and extendable uapi structure.
>> While it won't change anything here, still use fixed-length __u32.
>>
>> And you should perhaps add some reserved fields. Do not repeat the same
>> mistakes as your predecessors with the current kd uapi.
> 
> I thought about it, but I thought it would be overengineering.

It would not. UAPI structs are set in stone once released.

And in this case, it's likely you would want to know more info about 
fonts in the future.

> Can you suggest how best to do this?

Given you have flags in there already (to state that the structure 
contains more), just add an array of u32 reserved[] space. 3 or 5, I 
would say (to align the struct to 64bit).

thanks,
-- 
js
suse labs


Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ