linux-kernel - Re: [PATCH] lib: Extend kstrtobool() to accept "true"/"false"

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Message-ID: <202006260845.B573D53@keescook>
Date:   Fri, 26 Jun 2020 08:51:50 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Borislav Petkov <bp@...en8.de>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        rjw@...ysocki.net, viresh.kumar@...aro.org, lenb@...nel.org,
        dsmythies@...us.net, tglx@...utronix.de, mingo@...hat.com,
        hpa@...or.com, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org, x86@...nel.org, jic23@....ac.uk,
        akpm@...ux-foundation.org
Subject: Re: [PATCH] lib: Extend kstrtobool() to accept "true"/"false"

On Fri, Jun 26, 2020 at 12:44:42PM +0200, Peter Zijlstra wrote:
> On Fri, Jun 26, 2020 at 12:22:55PM +0200, Peter Zijlstra wrote:
> 
> > > This is too lax - it will be enabled for any !0 value. Please accept
> > > only 0 and 1.
> > 
> > kstrtobool() ftw
> 
> And looking at that, I find it really strange it does not in fact accept
> "true" / "false", so how about this?
> 
> ---
> Subject: lib: Extend kstrtobool() to accept "true"/"false"
> 
> Extend the strings recognised by kstrtobool() to cover:
> 
>   - 1/0
>   - y/n
>   - yes/no	(new)
>   - t/f		(new)
>   - true/false  (new)
>   - on/off
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>

There were some worries about dealing with unterminated strings when I
did the original conversion[1], but I think those all got fixed.

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

[1] https://lore.kernel.org/lkml/CAGXu5jJrFv5Y8Q_i3yFYBDmT0+pO05dS3ijB0gOn-huasxZWmA@mail.gmail.com/

-- 
Kees Cook