CONTAP-352417：修复 CONTAP-82775（Burt 1524672）后检测到 EMS 报告每日 auditlog.change.detected

问题描述

• 在 ONTAP 升级到已修复 Bug 1524672（CONTAP-82775）的版本后，集群中只有一个节点在 00:05（当地时间）报告先前旋转的auditlog.change.detected每日事件audit.log.xxx或mpaudit.log..xxx：
  Mon Jun 17 00:05:00 +0900 [Node-01: mgwd: auditlog.change.detected:error]: Audit log file "audit.log.0000001562" was tampered with.
Mon Jun 18 00:05:36 +0900 [Node-01: mgwd: auditlog.change.detected:error]: Audit log file "audit.log.0000001563" was tampered with.
Mon Jun 19 00:05:44 +0900 [Node-01: mgwd: auditlog.change.detected:error]: Audit log file "audit.log.0000001564" was tampered with.
...
  

• 在 mgwd.log 中，此 audit.log.xxx 文件显示以下错误消息：
  00000025.000bea70 01e5bc7a Fri Jul 26 2024 00:05:00 -04:00 [kern_mgwd:info:3205] 0x8318d7b00: 8603e9000000012a: ERR: tables::audit: Audit log signature file /mroot/etc/log/mlog/audit_log_sig/audit.log.0000001562.sig is empty.Hence, Signature verification failed for file: audit.log.0000001562. Line: 1398, Function: verify_hashes ...
  

• 事件中提到的 audit.log.xxx 文件的文件大小均超过 350 字节。使用 systemshell 列出目录：
  % ls -lh /mroot/etc/log/mlog/audit.log*
-rw-r--r--  2 root  wheel    70M Jun 18 10:03 /mroot/etc/log/mlog/audit.log
-rw-r--r--  1 root  wheel    76M May  1 14:17 /mroot/etc/log/mlog/audit.log.0000001562
-rw-r--r--  1 root  wheel    72M May  2 14:17 /mroot/etc/log/mlog/audit.log.0000001563
-rw-r--r--  1 root  wheel    72M May  3 14:17 /mroot/etc/log/mlog/audit.log.0000001564