linux-kernel - Re: [PATCH] random: kmalloc failure ignored in init_std

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Date:	Sat, 19 Sep 2009 02:19:35 -0500
From:	Matt Mackall <mpm@...enic.com>
To:	Roel Kluin <roel.kluin@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] random: kmalloc failure ignored in init_std_data()

On Sat, 2009-09-19 at 02:54 +0200, Roel Kluin wrote:
> kmalloc may fail so build the array into the statically allocated
> pool structures instead.
> 
> Signed-off-by: Roel Kluin <roel.kluin@...il.com>
> ---
> Is this what you had in mind? (it builds)

Yes, looks good.

Acked-by: Matt Mackall <mpm@...enic.com>

> diff --git a/drivers/char/random.c b/drivers/char/random.c
> index d8a9255..9012540 100644
> --- a/drivers/char/random.c
> +++ b/drivers/char/random.c
> @@ -400,6 +400,8 @@ module_param(debug, bool, 0644);
>   *
>   **********************************************************************/
>  
> +#define EXTRACT_SIZE 10
> +
>  struct entropy_store;
>  struct entropy_store {
>  	/* read-only data: */
> @@ -414,7 +416,9 @@ struct entropy_store {
>  	unsigned add_ptr;
>  	int entropy_count;
>  	int input_rotate;
> -	__u8 *last_data;
> +#ifdef CONFIG_CRYPTO_FIPS
> +	__u8 last_data[EXTRACT_SIZE];
> +#endif
>  };
>  
>  static __u32 input_pool_data[INPUT_POOL_WORDS];
> @@ -714,8 +718,6 @@ void add_disk_randomness(struct gendisk *disk)
>  }
>  #endif
>  
> -#define EXTRACT_SIZE 10
> -
>  /*********************************************************************
>   *
>   * Entropy extraction routines
> @@ -951,9 +953,6 @@ static void init_std_data(struct entropy_store *r)
>  	now = ktime_get_real();
>  	mix_pool_bytes(r, &now, sizeof(now));
>  	mix_pool_bytes(r, utsname(), sizeof(*(utsname())));
> -	/* Enable continuous test in fips mode */
> -	if (fips_enabled)
> -		r->last_data = kmalloc(EXTRACT_SIZE, GFP_KERNEL);
>  }
>  
>  static int rand_initialize(void)

-- 
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