OSEC

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Re: freebsd-security Digest, Vol 184, Issue 2

From: Alexander Leidinger (AlexanderLeidinger.net)
Date: Wed Nov 08 2006 - 02:12:17 CST


Quoting Wes Peters <wesopensail.org> (from Tue, 7 Nov 2006 23:28:15 -0800):

>
> On Nov 7, 2006, at 11:22 PM, Alexander Leidinger wrote:
>
>> Quoting Wes Peters <wesopensail.org> (from Tue, 7 Nov 2006 20:19:40 -0800):
>>
>>> --- /etc/rc.d/dmesg Sat May 6 21:00:26 2006
>>> +++ dmesg Tue Nov 7 20:17:47 2006
>>> -19,8 +19,10
>>> do_dmesg()
>>> {
>>> - rm -f ${dmesg_file}
>>> + mv -f ${dmesg_file} ${dmesg_file}.prev
>>> ( umask 022 ; /sbin/dmesg $rc_flags > ${dmesg_file} )
>>> + cmp -s ${dmesg_file} ${dmesg_file}.prev || \
>>> + logger -p security.warn 'dmesg.boot changed from
>>> previous boot'
>>> }
>>> load_rc_config $name
>>>
>>>
>>> If you like that, I'm willing to discuss it further, and/or commit it
>>> and let the howling tell if it's a keeper or not. ;^)
>>
>> Did you try this? I didn't, but I would expect to see this message
>> _every time_ (because of minor timecounter rate changes).
>
> Yes, but only once, and then forced a change by re-running it. Maybe I
> just got 'lucky.' Feel free to suggest 'better' tests, or parts to
> throw out of dmesg.boot before the test.

The ACPI-fast, ACPI-safe, TSC and i8xxx timecounter frequency needs to
be removed IMO. Sometimes I also see a very small change in the probe
order... but I don't remember exacly what's changing and what's
causing it.

Bye,
Alexander.

--
The days are all empty and the nights are unreal.

http://www.Leidinger.net Alexander Leidinger.net: PGP ID = B0063FE7
http://www.FreeBSD.org netchild FreeBSD.org : PGP ID = 72077137
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