linux-kernel - Re: [RESEND PATCH v2] params: Annotate struct module_param_attrs with __counted

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Message-ID: <c8cd1730-9472-4b02-9828-d1a8221fc487@suse.com>
Date: Mon, 17 Feb 2025 11:04:28 +0100
From: Petr Pavlu <petr.pavlu@...e.com>
To: Thorsten Blum <thorsten.blum@...ux.dev>
Cc: Kees Cook <kees@...nel.org>, "Gustavo A. R. Silva"
 <gustavoars@...nel.org>, Thomas Weißschuh
 <linux@...ssschuh.net>, Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
 Luis Chamberlain <mcgrof@...nel.org>, Nathan Chancellor <nathan@...nel.org>,
 linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [RESEND PATCH v2] params: Annotate struct module_param_attrs with
 __counted_by()

On 2/13/25 23:13, Thorsten Blum wrote:
> Add the __counted_by compiler attribute to the flexible array member
> attrs to improve access bounds-checking via CONFIG_UBSAN_BOUNDS and
> CONFIG_FORTIFY_SOURCE.
> 
> Increment num before adding a new param_attribute to the attrs array and
> adjust the array index accordingly. Increment num immediately after the
> first reallocation such that the reallocation for the NULL terminator
> only needs to add 1 (instead of 2) to mk->mp->num.
> 
> Use struct_size() instead of manually calculating the size for the
> reallocation.
> 
> Use krealloc_array() for the additional NULL terminator.
> 
> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> Cc: Luis Chamberlain <mcgrof@...nel.org>
> Cc: Nathan Chancellor <nathan@...nel.org>
> Signed-off-by: Thorsten Blum <thorsten.blum@...ux.dev>

Queued on modules-next.

-- 
Thanks,
Petr