!94 rasdaemon: quit loop in read_ras_event when kbuf data is broken

From: @znzjugod 
Reviewed-by: @lvying6 
Signed-off-by: @lvying6

fix-ras-events-quit-loop-in-read_ras_event-when-kbuf-dat.patch

@@ -0,0 +1,41 @@
+From d439975850f947ced01423dc4bb4d6406022b4e1 Mon Sep 17 00:00:00 2001
+From: hubin <hubin73@huawei.com>
+Date: Thu, 18 May 2023 16:14:41 +0800
+Subject: [PATCH] ras-events: quit loop in read_ras_event when kbuf data is
+ broken
+
+when kbuf data is broken, kbuffer_next_event() may move kbuf->index back to
+the current kbuf->index position, causing dead loop.
+
+In this situation, rasdaemon will repeatedly parse an invalid event, and
+print warning like "ug! negative record size -8!", pushing cpu utilization
+rate to 100%.
+
+when kbuf data is broken, discard current page and continue reading next page
+kbuf.
+
+Signed-off-by: hubin <hubin73@huawei.com>
+---
+ ras-events.c | 5 +++++
+ 1 file changed, 5 insertions(+)
+
+diff --git a/ras-events.c b/ras-events.c
+index 1479732..11ecb4d 100644
+--- a/ras-events.c
++++ b/ras-events.c
+@@ -498,6 +498,11 @@ static int read_ras_event_all_cpus(struct pthread_data *pdata,
+ 				kbuffer_load_subbuffer(kbuf, page);
+ 
+ 				while ((data = kbuffer_read_event(kbuf, &time_stamp))) {
++					if (kbuffer_curr_size(kbuf) < 0) {
++						log(TERM, LOG_ERR, "invalid kbuf data, discard\n");
++						break;
++					}
++
+ 					parse_ras_data(&pdata[i],
+ 						       kbuf, data, time_stamp);
+ 
+-- 
+2.33.0
+
+

rasdaemon.spec

@@ -1,6 +1,6 @@
 Name:			rasdaemon
 Version:		0.6.7
-Release:		12
+Release:		13
 License:		GPLv2
 Summary:		Utility to get Platform Reliability, Availability and Serviceability (RAS) reports via the Kernel tracing events
 URL:			https://github.com/mchehab/rasdaemon.git
@@ -52,7 +52,7 @@ Patch9003: 0001-rasdaemon-fix-return-value-type-issue-of-read-write-.patch
 Patch9004: 0002-rasdaemon-fix-issue-of-signed-and-unsigned-integer-c.patch
 Patch9005: 0003-rasdaemon-Add-support-for-creating-the-vendor-error-.patch
 Patch9006: 0004-rasdaemon-Add-four-modules-supported-by-HiSilicon-co.patch
-
+Patch9007: fix-ras-events-quit-loop-in-read_ras_event-when-kbuf-dat.patch
 
 %description
 The  rasdaemon  program  is  a  daemon which monitors the platform
@@ -98,6 +98,12 @@ rm INSTALL %{buildroot}/usr/include/*.h
 /usr/bin/systemctl enable rasdaemon.service >/dev/null 2>&1 || :
 
 %changelog
+* Tue Jun 20 2023 zhangnan <zhangnan134@huawei.com> - 0.6.7-13
+- Type:bugfix
+- ID:NA
+- SUG:NA
+- DESC:ras-events:quit loop read_ras_event when kbuf data is broken
+
 * Fri Jun 2 2023 Shiju Jose<shiju.jose@huawei.com> - 0.6.7-12
 - Type:bugfix
 - ID:NA