Commit 9d44a121 authored May 20, 2020 by Richard Guy Briggs Committed by Paul Moore May 20, 2020

audit: add subj creds to NETFILTER_CFG record to

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
context.

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 <rgb@redhat.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

parent 0090c1ed

kernel/auditsc.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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)
		return;
		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));
		audit_log_end(ab);
		}
		EXPORT_SYMBOL_GPL(__audit_log_nfcfg);

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