linux-kernel - Re: [PATCH v2 1/5] string_helpers: add kstrdup

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Message-ID: <1459207831.25110.37.camel@perches.com>
Date:	Mon, 28 Mar 2016 16:30:31 -0700
From:	Joe Perches <joe@...ches.com>
To:	Kees Cook <keescook@...omium.org>, James Morris <jmorris@...ei.org>
Cc:	"Serge E. Hallyn" <serge@...lyn.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kalle Valo <kvalo@...eaurora.org>,
	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Guenter Roeck <linux@...ck-us.net>,
	Jiri Slaby <jslaby@...e.com>, Paul Moore <pmoore@...hat.com>,
	Stephen Smalley <sds@...ho.nsa.gov>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Casey Schaufler <casey@...aufler-ca.com>,
	Andreas Gruenbacher <agruenba@...hat.com>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	Rasmus Villemoes <linux@...musvillemoes.dk>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Vitaly Kuznetsov <vkuznets@...hat.com>,
	linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/5] string_helpers: add kstrdup_quotable

On Mon, 2016-03-28 at 14:14 -0700, Kees Cook wrote:
> Handle allocating and escaping a string safe for logging.
[]
> diff --git a/include/linux/string_helpers.h b/include/linux/string_helpers.h
[]
> @@ -68,4 +68,6 @@ static inline int string_escape_str_any_np(const char *src, char *dst,
>  	return string_escape_str(src, dst, sz, ESCAPE_ANY_NP, only);
>  }
>  
> +char *kstrdup_quotable(char *src);

char *kstrdup_quotable(const char *src)

but shouldn't this really take a gfp_t like all
the other kstr<string> functions?

> diff --git a/lib/string_helpers.c b/lib/string_helpers.c
[]
> +char *kstrdup_quotable(char *src)
[]
> +	BUG_ON(string_escape_mem(src, slen, dst, dlen, flags, esc) != dlen);

BUG_ON?  why?