linux-kernel - Re: [PATCH 01/16] fix default __strnlen

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Date:	Fri, 13 May 2011 13:55:02 +0000
From:	Pavel Machek <pavel@....cz>
To:	Mark Salter <msalter@...hat.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/16] fix default __strnlen_user macro

Hi!

> The existing __strnlen_user macro simply resolved to strnlen. However, the
> count returned by strnlen_user should include the NULL byte. This patch
> fixes the __strnlen_user macro to include the NULL byte in the count.

Are you sure? Having strnlen and _foo_strnlen with different return
values seems very very dangerous.

> @@ -289,7 +289,7 @@ strncpy_from_user(char *dst, const char __user *src, long count)
>   * Return 0 on exception, a value greater than N if too long
>   */
>  #ifndef __strnlen_user
> -#define __strnlen_user strnlen
> +#define __strnlen_user(s, n) (strnlen((s), (n)) + 1)
>  #endif
>  

-- 
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