linux-hardening - Re: [PATCH] comedi: Annotate struct comedi_lrange with __counted

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Date: Sun, 5 Nov 2023 22:27:50 +0100
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Kees Cook <keescook@...omium.org>, Julia Lawall <julia.lawall@...ia.fr>
Cc: Kees Cook <kees@...nel.org>, "Gustavo A. R. Silva"
 <gustavoars@...nel.org>, linux-kernel@...r.kernel.org,
 kernel-janitors@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH] comedi: Annotate struct comedi_lrange with __counted_by

Le 01/10/2023 à 23:22, Kees Cook a écrit :
> On Sun, Oct 01, 2023 at 02:05:46PM -0700, Kees Cook wrote:
>> On Sun, Oct 01, 2023 at 09:14:02PM +0200, Julia Lawall wrote:
>>> Kees,
>>>
>>> You can try the following.
>>
>> Cool! Yeah, this finds the example:
>>
>> drivers/comedi/drivers/rti800.c:74: struct comedi_lrange: field at offset 0 is the counter for the flex array
>> drivers/comedi/drivers/rti800.c:83: struct comedi_lrange: field at offset 0 is the counter for the flex array
>> drivers/comedi/drivers/rti800.c:92: struct comedi_lrange: field at offset 0 is the counter for the flex array
>>
>> I'll run it on the whole codebase...
> 
> It found only the struct comedi_lrange instances, but that's good to
> know. :)
> 

Hi,

(removing most of people from the thread)

I found another one.

struct ocotp_devtype_data has a field 'num_entry' which is the number of 
entries in 'entry' flex array.

[1]: 
https://elixir.bootlin.com/linux/v6.6/source/drivers/nvmem/imx-ocotp-ele.c#L28
[2]: 
https://elixir.bootlin.com/linux/v6.6/source/drivers/nvmem/imx-ocotp-ele.c#L143

CJ