linux-kernel - Re: [PATCH v2] wifi: ipw2x00: refactor to use kstrtoul

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Message-ID: <202308040120.183400A04@keescook>
Date:   Fri, 4 Aug 2023 01:21:07 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Justin Stitt <justinstitt@...gle.com>
Cc:     Stanislav Yakovlev <stas.yakovlev@...il.com>,
        Kalle Valo <kvalo@...nel.org>, linux-wireless@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v2] wifi: ipw2x00: refactor to use kstrtoul

On Wed, Aug 02, 2023 at 01:23:06AM +0000, Justin Stitt wrote:
> The current implementation seems to reinvent what `kstrtoul` already does
> in terms of functionality and error handling. Remove uses of `simple_strtoul()`
> in favor of `kstrtoul()`.
> 
> There is the following note at `lib/vsprintf.c:simple_strtoull()` which
> further backs this change:
> | * This function has caveats. Please use kstrtoull (or kstrtoul) instead.
> 
> And here, simple_str* are explicitly deprecated [3].
> 
> This patch also removes an instance of the deprecated `strncpy` which helps [2].
> 
> Link: https://lore.kernel.org/all/202308011602.3CC1C0244C@keescook/ [1]
> Link: https://github.com/KSPP/linux/issues/90 [2]
> Link: https://docs.kernel.org/process/deprecated.html#simple-strtol-simple-strtoll-simple-strtoul-simple-strtoull [3]
> Cc: linux-hardening@...r.kernel.org
> Suggested-by: Kees Cook <keescook@...omium.org>
> Signed-off-by: Justin Stitt <justinstitt@...gle.com>

This looks correct to me. I would be curious to hear back from the intel
folks if the interface continues to work correctly with real hardware.

Reviewed-by: Kees Cook <keescook@...omium.org>

-- 
Kees Cook