linux-kernel - Re: IRQF_SAMPLE

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Message-ID: <a24804730904071439g4cc1779bi1ebaf814d370708c@mail.gmail.com>
Date:	Tue, 7 Apr 2009 14:39:05 -0700
From:	Chris Peterson <cpeterso@...terso.com>
To:	Matt Mackall <mpm@...enic.com>
Cc:	Robin Getz <rgetz@...ckfin.uclinux.org>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: IRQF_SAMPLE_RANDOM question...

1. Are there any new add_*_randomness() functions that could be added?
Some userspace daemons like EGD (running as root) feed random system
info (e.g. vmstat) into /dev/random. But how many Linux distros
actually run entropy-gathering daemons by default? Would /dev/random
be more secure if entropy-gathering daemons were replaced with new
kernel functions like add_vmstat_randomness() or add_ps_randomness()?

2. Are there any other functions that could be calling the existing
add_*_randomness() functions? Currently:

* add_input_randomness() is called from input_event().
* add_interrupt_randomess() is called from handle_IRQ_event() if
IRQF_SAMPLE_RANDOM is set.
* add_disk_randomness() is called from blk_end_io() and __blk_end_request().
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