[PATCH 1/2] integrity: Add errno field in audit message

[Lakshmi Ramasubramanian]

Error code is not included in the audit messages logged by
the integrity subsystem. Add a new field namely "errno" in
the audit message and set the value to the error code passed
to integrity_audit_msg() in the "result" parameter.

Sample audit message:

[    6.284329] audit: type=1804 audit(1591756723.627:2): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=kernel op=add_boot_aggregate cause=alloc_entry errno=-12 comm="swapper/0" name="boot_aggregate" res=0

Signed-off-by: Lakshmi Ramasubramanian <nramas@xxxxxxxxxxxxxxxxxxx>
Suggested-by: Steve Grubb <sgrubb@xxxxxxxxxx>
---
 security/integrity/integrity_audit.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/security/integrity/integrity_audit.c b/security/integrity/integrity_audit.c
index 5109173839cc..8cbf415bb977 100644
--- a/security/integrity/integrity_audit.c
+++ b/security/integrity/integrity_audit.c
@@ -42,7 +42,8 @@ void integrity_audit_msg(int audit_msgno, struct inode *inode,
 			 from_kuid(&init_user_ns, audit_get_loginuid(current)),
 			 audit_get_sessionid(current));
 	audit_log_task_context(ab);
-	audit_log_format(ab, " op=%s cause=%s comm=", op, cause);
+	audit_log_format(ab, " op=%s cause=%s errno=%d comm=",
+			 op, cause, result);
 	audit_log_untrustedstring(ab, get_task_comm(name, current));
 	if (fname) {
 		audit_log_format(ab, " name=");
-- 
2.27.0