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Re: netstat from ssh_prng_cmds taking too much CPU on AIX

from [Darren Tucker] Network Security [Permanent Link]
Subject: Re: netstat from ssh_prng_cmds taking too much CPU on AIX
Date: Sun, 20 Mar 2005 15:52:20 +1100
Ronald B. Miller wrote:
I recently installed OpenSSH 3.9p1 on an AIX 5.1 system. Since then we have
noticed that ssh_rand_helper has started netstat commands (from
ssh_prng_cmds) that don't finish quickly and cause the CPU to jump to almost
no idle for extended lengths of time - usually about 20 minutes or so.

Which variants of the netstat command are causing the problem? You can run ssh-rand-helper -vvv on its own and watch its progress.

If there are processes hanging around after ssh-rand-helper times them out it means they're ignoring a SIGINT, so either it's being deliberately caught or (more likely) the command is stuck in a syscall.

I have commented out the netstat commands in the ...cmds file and wonder if
anyone has either a warning about doing that or a better resolution to my
problem. Thanks in advance.

The best long-term solution is to use prngd instead of the built-in entropy gatherer.

--
Darren Tucker (dtucker at zip.com.au)
GPG key 8FF4FA69 / D9A3 86E9 7EEE AF4B B2D4  37C9 C982 80C7 8FF4 FA69
    Good judgement comes with experience. Unfortunately, the experience
usually comes from bad judgement.

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