linux-kernel - Re: [PATCH v2] wifi: iwlwifi: fw: replace deprecated strncpy with strscpy

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Message-ID: <874jh2rtuk.fsf@kernel.org>
Date:   Fri, 01 Dec 2023 14:27:15 +0200
From:   Kalle Valo <kvalo@...nel.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Justin Stitt <justinstitt@...gle.com>,
        Gregory Greenman <gregory.greenman@...el.com>,
        linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2] wifi: iwlwifi: fw: replace deprecated strncpy with
 strscpy_pad

Kees Cook <keescook@...omium.org> writes:

> On Thu, Oct 19, 2023 at 05:44:59PM +0000, Justin Stitt wrote:
>> strncpy() is deprecated for use on NUL-terminated destination strings
>> [1] and as such we should prefer more robust and less ambiguous string
>> interfaces.
>> 
>> Based on the deliberate `sizeof(dest) ... - 1` pattern we can see that
>> both dump_info->dev_human_readable and dump_info->bus_human_readable are
>> intended to be NUL-terminated.
>> 
>> Moreover, since this seems to cross the file boundary let's NUL-pad to
>> ensure no behavior change.
>> 
>> strscpy_pad() covers both the NUL-termination and NUL-padding, let's use
>> it.
>> 
>> Link:
>> https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings
>> [1]
>> Link: https://github.com/KSPP/linux/issues/90
>> Cc: linux-hardening@...r.kernel.org
>> Signed-off-by: Justin Stitt <justinstitt@...gle.com>
>
> Thread ping. Can the wireless folks please pick this up?

Yeah, I'll take this directly to wireless-next.

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