linux-kernel - Re: [PATCH 0/2] vsprintf: ignore %n again

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Message-ID: <20130918142837.GU19256@mwanda>
Date:	Wed, 18 Sep 2013 17:28:37 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
Cc:	keescook@...omium.org, viro@...iv.linux.org.uk,
	linux-kernel@...r.kernel.org, joe@...ches.com, linux@...izon.com,
	JBeulich@...e.com, kosaki.motohiro@...il.com,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 0/2] vsprintf: ignore %n again

On Wed, Sep 18, 2013 at 05:11:04PM +0300, Dan Carpenter wrote:
>  asmlinkage __printf(1, 2) __cold
>  int printk(const char *fmt, ...);
> +#define printk(fmt, ...) do {				  \
> +	compiletime_assert(__builtin_constant_p(fmt),     \
> +			   "Non-constant format string"); \
> +	printk(fmt, ##__VA_ARGS__);			  \
> +} while (0)

Oops...  That breaks the compile for printk.c.

Also don't we want 'const char fmt[] = "foo %s";' to be a valid format
string?

regards,
dan carpenter
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