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

[Lakshmi Ramasubramanian]

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

Sample audit messages:

[    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 comm="swapper/0" name="boot_aggregate" res=0 errno=-12

[    8.085456] audit: type=1802 audit(1592005947.297:9): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 op=policy_update cause=completed comm="systemd" res=1 errno=0

Signed-off-by: Lakshmi Ramasubramanian <nramas at linux.microsoft.com>
Suggested-by: Steve Grubb <sgrubb at redhat.com>
---
 security/integrity/integrity_audit.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/integrity/integrity_audit.c b/security/integrity/integrity_audit.c
index 5109173839cc..a265024f82f3 100644
--- a/security/integrity/integrity_audit.c
+++ b/security/integrity/integrity_audit.c
@@ -53,6 +53,6 @@ void integrity_audit_msg(int audit_msgno, struct inode *inode,
 		audit_log_untrustedstring(ab, inode->i_sb->s_id);
 		audit_log_format(ab, " ino=%lu", inode->i_ino);
 	}
-	audit_log_format(ab, " res=%d", !result);
+	audit_log_format(ab, " res=%d errno=%d", !result, result);
 	audit_log_end(ab);
 }
-- 
2.27.0