linux-hardening - Re: [PATCH v2] Input: axp20x-pek

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Message-ID: <ZRhOGiZjEI8EEgtl@google.com>
Date: Sat, 30 Sep 2023 09:34:34 -0700
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Justin Stitt <justinstitt@...gle.com>
Cc: Chen-Yu Tsai <wens@...e.org>, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
	Kees Cook <keescook@...omium.org>
Subject: Re: [PATCH v2] Input: axp20x-pek - avoid needless newline removal

On Mon, Sep 25, 2023 at 04:31:05AM +0000, Justin Stitt wrote:
> This code is doing more work than it needs to.
> 
> Before handing off `val_str` to `kstrtouint()` we are eagerly removing
> any trailing newline which requires copying `buf`, validating it's
> length and checking/replacing any potential newlines.
> 
> kstrtouint() handles this implicitly:
> kstrtouint ->
>   kstrotoull -> (documentation)
> |   /**
> |    * kstrtoull - convert a string to an unsigned long long
> |    * @s: The start of the string. The string must be null-terminated, and may also
> |    *  include a single newline before its terminating null. The first character
> |    ...
> 
> Let's remove the redundant functionality and let kstrtouint handle it.
> 
> Link: https://github.com/KSPP/linux/issues/90
> Cc: linux-hardening@...r.kernel.org
> Suggested-by: Kees Cook <keescook@...omium.org>
> Signed-off-by: Justin Stitt <justinstitt@...gle.com>

Applied, thank you.

-- 
Dmitry