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Date: Fri, 11 Dec 2015 19:00:32 +0200
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Kees Cook <keescook@...omium.org>
Cc: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Rasmus Villemoes <linux@...musvillemoes.dk>, Daniel Borkmann <daniel@...earbox.net>,
Ingo Molnar <mingo@...hat.com>, Andy Lutomirski <luto@...capital.net>, "H. Peter Anvin" <hpa@...or.com>,
Michael Ellerman <mpe@...erman.id.au>, Mathias Krause <minipli@...glemail.com>,
Thomas Gleixner <tglx@...utronix.de>, "x86@...nel.org" <x86@...nel.org>, Arnd Bergmann <arnd@...db.de>,
PaX Team <pageexec@...email.hu>, Emese Revfy <re.emese@...il.com>,
kernel-hardening@...ts.openwall.com, linux-arch <linux-arch@...r.kernel.org>
Subject: Re: [PATCH v3 2/8] lib: add "on" and "off" to strtobool
On Wed, Dec 9, 2015 at 11:43 PM, Kees Cook <keescook@...omium.org> wrote:
> Several places in the kernel expect to use "on" and "off" for their
> boolean signifiers, so add them to strtobool.
>
> Signed-off-by: Kees Cook <keescook@...omium.org>
> Cc: Rasmus Villemoes <linux@...musvillemoes.dk>
> Cc: Daniel Borkmann <daniel@...earbox.net>
> ---
> lib/string.c | 21 ++++++++++++++++++++-
> 1 file changed, 20 insertions(+), 1 deletion(-)
>
> diff --git a/lib/string.c b/lib/string.c
> index 0323c0d5629a..d7550432f91c 100644
> --- a/lib/string.c
> +++ b/lib/string.c
> @@ -635,12 +635,16 @@ EXPORT_SYMBOL(sysfs_streq);
> * @s: input string
> * @res: result
> *
> - * This routine returns 0 iff the first character is one of 'Yy1Nn0'.
> + * This routine returns 0 iff the first character is one of 'Yy1Nn0', or
> + * 'Oo' when the second character is one of 'fFnN' (for "on" and "off").
Maybe
…or [Oo][FfNn] for "off" and "on"…
> * Otherwise it will return -EINVAL. Value pointed to by res is
> * updated upon finding a match.
> */
> int strtobool(const char *s, bool *res)
> {
> + if (!s)
> + return -EINVAL;
> +
This change I think is better to do separately. Do we have even need for it?
> switch (s[0]) {
> case 'y':
> case 'Y':
> @@ -652,6 +656,21 @@ int strtobool(const char *s, bool *res)
> case '0':
> *res = false;
> break;
> + case 'o':
> + case 'O':
> + switch (s[1]) {
> + case 'n':
> + case 'N':
> + *res = true;
> + break;
> + case 'f':
> + case 'F':
> + *res = false;
> + break;
> + default:
> + return -EINVAL;
> + }
> + break;
> default:
> return -EINVAL;
Maybe in both cases
default:
break;
}
…
}
return -EINVAL;
--
With Best Regards,
Andy Shevchenko
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