linux-kernel - Re: [PATCH 06/19] Add ioctl() argument and attribute handling utils

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Date:	Fri, 20 Aug 2010 14:59:06 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Miloslav Trmač <mitr@...hat.com>
CC:	Herbert Xu <herbert@...dor.hengli.com.au>,
	linux-crypto@...r.kernel.org,
	Nikos Mavrogiannopoulos <n.mavrogiannopoulos@...il.com>,
	Neil Horman <nhorman@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 06/19] Add ioctl() argument and attribute handling utils

Miloslav Trmač wrote:
> --- /dev/null
> +++ b/crypto/userspace/utils.c
[...]
> +#ifdef CONFIG_COMPAT
> +/* max() is too clever for compile-time constants */
> +#define CONST_MAX(A, B) ((A) > (B) ? (A) : (B))
> +
> +#define MAX_SESSION_INPUT_DATA_SIZE					\
> +	(CONST_MAX(sizeof(struct ncr_session_input_data),		\
> +		   sizeof(struct compat_ncr_session_input_data)))
> +#define MAX_SESSION_OUTPUT_BUFFER_SIZE					\
> +	(CONST_MAX(sizeof(struct ncr_session_output_buffer),		\
> +		   sizeof(struct compat_ncr_session_output_buffer)))
> +
> +#else /* !CONFIG_COMPAT */
> +
> +#define MAX_SESSION_INPUT_DATA_SIZE (sizeof(struct ncr_session_input_data))
> +#define MAX_SESSION_OUTPUT_BUFFER_SIZE			\
> +	(sizeof(struct ncr_session_output_buffer))
> +
> +#endif /* !CONFIG_COMPAT */

struct compat_xyz cannot be bigger than struct xyz, can it?
-- 
Stefan Richter
-=====-==-=- =--- =-=--
http://arcgraph.de/sr/
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