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

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Date:   Wed, 16 Aug 2023 13:47:04 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Kalle Valo <kvalo@...nel.org>
Cc:     Justin Stitt <justinstitt@...gle.com>,
        Stanislav Yakovlev <stas.yakovlev@...il.com>,
        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 Fri, Aug 04, 2023 at 12:05:26PM +0300, Kalle Valo wrote:
> Kees Cook <keescook@...omium.org> writes:
> 
> > 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>
> 
> This is ancient hardware, not sure if anyone even have a working setup.
> And even if they would have one I doubt anyone uses this sysfs interface
> for anything.

Just a quick ping; is this patch ready to land?

-- 
Kees Cook