Re: Occasional delayed output of events

[Burn Alting <burn.alting@iinet.net.au>]

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On Tue, 2021-01-26 at 11:29 +1100, Burn Alting wrote:
> On Mon, 2021-01-25 at 19:20 -0500, Steve Grubb wrote:
> > On Monday, January 25, 2021 7:11:45 PM EST Burn Alting wrote:
> > > On Mon, 2021-01-25 at 18:53 -0500, Steve Grubb wrote:
> > > > On Saturday, January 23, 2021 5:55:44 PM EST Burn Alting wrote:
> > > > > > > How is the following for a way forward.a. I will author a patch to the
> > > > > > > user space code to correctly parsethiscondition and submit it on the
> > > > > > > weekend. It will be via a newconfiguration item to auditd.conf just in
> > > > > > > case placing a fixedextended timeout (15-20 secs) affects memory usage
> > > > > > > for users of theauparse library. This solves the initial problem
> > > > > > > ofausearch/auparsefailing to parse generated audit.b. I am happy to
> > > > > > > instrument whateveris recommended on my hosts at home (vm's and bare
> > > > > > > metal) to providemore information, should we want to 'explain' the
> > > > > > > occurrence, givenIsee this every week or two and report back.
> > > > > > 
> > > > > > Seems reasonable to me.
> > > > > 
> > > > > I can implement the 'end_of_event_timeout' change either asi. a command
> > > > > line argument to ausearch/aureport (say --eoetmo secs) andanew pair of
> > > > > library functions within the  auparse() stable
> > > > > (sayauparse_set_eoe_timeout() and auparse_get_eoe_timeout())orii. a
> > > > > configuration item in /etc/audit/auditd.conf, or
> > > > > 
> > > > > Which is your preference? Mine is i. as this is a user space
> > > > > processingchange, not a demon change.
> > > > 
> > > > To be honest, I'm not entirely sure what we're seeing. I run some teststoday
> > > > on my system. It's seeing issues also. I'd still like to treat theroot cause
> > > > of this. But we do need to change the default. That I whatI'm trying to
> > > > figure out.
> > > > Back to your question, I'm wondering if we should do both? A
> > > > changeabledefault in auditd.conf and an override on the command line.
> > > 
> > > So far, all items in /etc/audit/auditd.conf appear to only affect thedaemon.
> > > Is this the right location to start adding non-daemonconfiguration items? (I
> > > accept there is no other place).
> > 
> > ausearch/report/auparse all read the auditd.conf to find the canonical location
> > for where the logs are supposed to be. So, they already read this file. I'd
> > rather keep it there than make yet another config. The only drawback it that it
> > might again confuse people that auditd really doesn't do anything with the
> > records but just some light processing.
> 
> OK. I will put it in /etc/audit/auditd.conf

One question with this solution. If the user does not have read permission to
/etc/audit/auditd.conf, then any change cannot take effect. The default mode for
this file is 640 to root, so a non-root user could never change the timeout.

Should I also add
- a command line argument to ausearch/aureport (say --eoetmo secs) and,
- a pair of new auparse() functions - auparse_set_eoe_timeout() and
auparse_get_eoe_timeout()
so that non root users can make use of the new configuration item.

Also, do you want the default timeout to be 2 seconds or should I make it higher.



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