Unhelpful events

[Steve Grubb]

On Monday, June 7, 2021 1:42:49 PM EDT Richard Guy Briggs wrote:
> On 2021-06-07 11:32, Steve Grubb wrote:
> > Hello,
> > 
> > While patching up the event normalizer, I run across these events which
> > really have no useful information:
> > 
> > type=BPF msg=audit(1622913714.840:15017): prog-id=137 op=UNLOAD
> > 
> > type=TIME_INJOFFSET msg=audit(1622547739.500:4): sec=0 nsec=486383948
> 
> Fedora?  "-a task,never"?

Nope. It is event #4. Does this even need to be sent? A TIME_INJOFFSET with 
no supporting info is not helpful.


> I assume ghak120 should be present in what you are using by now (v5.11)?

5.12.8

> 	https://github.com/linux-audit/audit-kernel/issues/120
> 	"BUG: accompanying records missing for requried records when no rules
> present"

There is no syscall anywhere near this:

type=SERVICE_STOP msg=audit(06/06/2021 08:44:53.922:973) : pid=1 uid=root 
auid=unset ses=unset subj=system_u:system_r:init_t:s0 msg='unit=systemd-
hostnamed comm=systemd exe=/usr/lib/systemd/systemd hostname=? addr=? 
terminal=? res=success' 
----
type=NETFILTER_CFG msg=audit(06/06/2021 08:44:53.947:974) : table=nat 
family=bridge entries=0 op=xt_unregister pid=5833 
subj=system_u:system_r:kernel_t:s0 comm=kworker/u16:3 
----
type=NETFILTER_CFG msg=audit(06/06/2021 08:44:53.947:975) : table=broute 
family=bridge entries=0 op=xt_unregister pid=5833 
subj=system_u:system_r:kernel_t:s0 comm=kworker/u16:3 
----
type=NETFILTER_CFG msg=audit(06/06/2021 08:44:53.947:976) : table=filter 
family=bridge entries=0 op=xt_unregister pid=5833 
subj=system_u:system_r:kernel_t:s0 comm=kworker/u16:3 

> > type=NETFILTER_CFG msg=audit(06/06/2021 08:44:53.947:976) : table=filter
> > family=bridge entries=0 op=xt_unregister pid=5833
> > subj=system_u:system_r:kernel_t:s0 comm=kworker/u16:3

> This is as complete as this event is going to get. It is a kernel
> event, reaping an unused table after a timeout.  See
> 	https://github.com/linux-audit/audit-kernel/issues/25

 auid=-1 ses=-1  was it successful?

Was the BPF event succesful? Is there the equivalent of a task struct for BPF 
programs that tells anything about who it belonged to?

-Steve

> > Either their syscall record is missing or they simply do not have all the
> > necessary information. (Subject, action, object, results)
> > 
> > -Steve
> 
> - RGB
> 
> --
> Richard Guy Briggs <rgb at redhat.com>
> Sr. S/W Engineer, Kernel Security, Base Operating Systems
> Remote, Ottawa, Red Hat Canada
> IRC: rgb, SunRaycer
> Voice: +1.647.777.2635, Internal: (81) 32635