10:32 a.m.
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
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
Either their syscall record is missing or they simply do not have all the
necessary information. (Subject, action, object, results)
-Steve
12:42 p.m.
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"?
I assume ghak120 should be present in what you are using by now (v5.11)?
https://github.com/linux-audit/audit-kernel/issues/120
"BUG: accompanying records missing for requried records when no rules present"
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
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(a)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
1:38 p.m.
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(a)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
2:22 p.m.
On 2021-06-07 14:38, Steve Grubb wrote:
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'm guessing that matching op=LOAD was done by systemd/init PID=1.
> I assume ghak120 should be present in what you are using by now
(v5.11)?
5.12.8
Ok, that rules out that possibility.
> 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
These three would have been preceeded by an op=xt_register event that
may not have been logged up to 30 seconds earlier.
> > 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?
Sounds like it needs a "success" field that will be a duplicate of the
same field when a SYSCALL record is present.
I have also seen a NETFILTER_CFG op=xt_register (event#5) that was
systemd/init PID=1 or a hard-linked kernel module (rather than loadable
initiated by userspace) that was kernel-initiated.
Was the BPF event succesful? Is there the equivalent of a task struct
for BPF
programs that tells anything about who it belonged to?
The BPF unload events appear to be in the same situation as the
type=NETFILTER_CFG op=xt_unregister events, kernel-initiated, matched
with an op=LOAD event by prog-id= field with full details. Perhaps it
also needs pid= subj= comm= and success= fields.
-Steve
> > Either their syscall record is missing or they simply do not have all the
> > necessary information. (Subject, action, object, results)
> >
> > -Steve
>
> - RGB
- RGB
--
Richard Guy Briggs <rgb(a)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
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Richard Guy Briggs -
Steve Grubb