linux-kernel - Re: drivers/char/random.c line 728 BUG

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Message-ID: <20080829223155.GM31108@merfinllc.com>
Date:	Fri, 29 Aug 2008 15:31:55 -0700
From:	Aaron Straus <aaron@...finllc.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	mpm@...enic.com, linux-kernel@...r.kernel.org,
	Theodore Ts'o <tytso@....edu>, stable@...nel.org
Subject: Re: drivers/char/random.c line 728 BUG

Hi,

On Aug 29 12:48 PM, Andrew Morton wrote:
> yep, I would agree with all that.

Thanks for responding.

> How's this look?

Quick question off list... below

> -	if (r == &input_pool &&
> -	    r->entropy_count >= random_read_wakeup_thresh) {
> +	if (r == &input_pool && entropy_count >= random_read_wakeup_thresh) {
>  		wake_up_interruptible(&random_read_wait);
>  		kill_fasync(&fasync, SIGIO, POLL_IN);
>  	}
> -
> +	r->entropy_count = entropy_count;

Here you set the entropy_count in the pool *after* waking up the reader.
I was a little worried the reader would find the entropy_count unchanged
and go back to sleep.


					Regards,
					=a=

-- 
===================
Aaron Straus
aaron@...finllc.com
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