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From: Richard Guy Briggs <>
To: Linux-Audit Mailing List <>,
	LKML <>,
Cc: Paul Moore <>,,,,,,,
	Richard Guy Briggs <>
Subject: [PATCH ghak25 v6a] audit: add subj creds to NETFILTER_CFG record to cover async unregister
Date: Wed, 20 May 2020 14:47:13 -0400
Message-ID: <> (raw)

Some table unregister actions seem to be initiated by the kernel to
garbage collect unused tables that are not initiated by any userspace
actions.  It was found to be necessary to add the subject credentials to
cover this case to reveal the source of these actions.  A sample record:

The uid, auid, tty, ses and exe fields have not been included since they
are in the SYSCALL record and contain nothing useful in the non-user

Here are two sample orphaned records:

  type=NETFILTER_CFG msg=audit(2020-05-20 12:14:36.505:5) : table=filter family=ipv4 entries=0 op=register pid=1 subj=kernel comm=swapper/0

  type=NETFILTER_CFG msg=audit(2020-05-20 12:15:27.701:301) : table=nat family=bridge entries=0 op=unregister pid=30 subj=system_u:system_r:kernel_t:s0 comm=kworker/u4:1

Signed-off-by: Richard Guy Briggs <>
- remove uid, auid fields as duplicates or unset
- update sample records in patch description

- rebase on upstreamed ghak28 on audit/next v5.7-rc1
- remove tty, ses and exe fields as duplicates or unset
- drop upstreamed patches 1&2 from set

- rebase on audit/next v5.7-rc1
- fix errors/warnings in 1/3 and 2/3

- rebase on v5.6-rc1 audit/next
- change audit_nf_cfg to audit_log_nfcfg
- squash 2,3,4,5 to 1 and update patch descriptions
- add subject credentials to cover garbage collecting kernel threads

- Rebase (audit/next 5.5-rc1) to get audit_context access and ebt_register_table ret code
- Split x_tables and ebtables updates
- Check audit_dummy_context
- Store struct audit_nfcfg params in audit_context, abstract to audit_nf_cfg() call
- Restore back to "table, family, entries" from "family, table, entries"
- Log unregistration of tables
- Add "op=" at the end of the AUDIT_NETFILTER_CFG record
- Defer nsid patch (ghak79) to once nsid patchset upstreamed (ghak32)
- Add ghak refs

 kernel/auditsc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index cfe3486e5f31..468a23390457 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -2557,12 +2557,18 @@ void __audit_log_nfcfg(const char *name, u8 af, unsigned int nentries,
 		       enum audit_nfcfgop op)
 	struct audit_buffer *ab;
+	char comm[sizeof(current->comm)];
 	ab = audit_log_start(audit_context(), GFP_KERNEL, AUDIT_NETFILTER_CFG);
 	if (!ab)
 	audit_log_format(ab, "table=%s family=%u entries=%u op=%s",
 			 name, af, nentries, audit_nfcfgs[op].s);
+	audit_log_format(ab, " pid=%u", task_pid_nr(current));
+	audit_log_task_context(ab); /* subj= */
+	audit_log_format(ab, " comm=");
+	audit_log_untrustedstring(ab, get_task_comm(comm, current));

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Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-20 18:47 Richard Guy Briggs [this message]
2020-05-20 22:24 ` Paul Moore

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