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Bug 1827275

Summary: ptp4l fails on zero-length message
Product: Red Hat Enterprise Linux 8 Reporter: Miroslav Lichvar <mlichvar>
Component: linuxptpAssignee: Miroslav Lichvar <mlichvar>
Status: CLOSED ERRATA QA Contact: Yalin.Li <yalli>
Severity: medium Docs Contact:
Priority: medium    
Version: 8.2CC: psklenar, yalli
Target Milestone: rcKeywords: FastFix, Patch, Reproducer, Triaged
Target Release: ---Flags: pm-rhel: mirror+
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: linuxptp-2.0-5.el8 Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2020-11-04 02:45:41 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Miroslav Lichvar 2020-04-23 14:12:46 UTC 
Description of problem:
When a zero-length message is received by ptp4l, it is handled as a recv() error, triggering a fault condition on the port. Such messages should be ignored as malformed messages.

This is fixed in upstream commit 
https://github.com/richardcochran/linuxptp/commit/6b61ba29c78e26109426429c6d6b354f6e4443cd

Version-Release number of selected component (if applicable):
linuxptp-2.0-4.el8.x86_64

How reproducible:
always

Steps to Reproduce:
1. ptp4l -i lo -m
2. socat udp4:127.0.0.1:320,shut-null /dev/null

Actual results:
ptp4l[2606397.512]: recvmsg failed: No such device or address
ptp4l[2606397.512]: port 1: recv message failed
ptp4l[2606397.512]: port 1: MASTER to FAULTY on FAULT_DETECTED (FT_UNSPECIFIED)

Expected results:
ptp4l[2606419.127]: port 1: bad message
Comment 3 Yalin.Li 2020-07-23 04:46:29 UTC 
reproduced in linuxptp-2.0-4.el8.x86_64:
[root@dell-per740-46 ~]# rpm -q linuxptp
linuxptp-2.0-4.el8.x86_64
[root@dell-per740-46 ~]# 
[root@dell-per740-46 ~]# ptp4l -i lo -mS &
[1] 18800
[root@dell-per740-46 ~]# ptp4l[2496.000]: port 1: INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[2496.000]: port 0: INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[2502.131]: port 1: LISTENING to MASTER on ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES
ptp4l[2502.131]: selected local clock 000000.fffe.000000 as best master
ptp4l[2502.131]: assuming the grand master role

[root@dell-per740-46 ~]# socat udp4:127.0.0.1:320,shut-null /dev/null        <------- send message here
ptp4l[2518.237]: recvmsg failed: No such device or address
ptp4l[2518.237]: port 1: recv message failed
ptp4l[2518.237]: port 1: MASTER to FAULTY on FAULT_DETECTED (FT_UNSPECIFIED)  <-------ptp4l enter FAULTY here
[root@dell-per740-46 ~]# 
[root@dell-per740-46 ~]# ptp4l[2534.238]: port 1: FAULTY to LISTENING on INIT_COMPLETE
ptp4l[2541.231]: port 1: LISTENING to MASTER on ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES
ptp4l[2541.231]: selected local clock 000000.fffe.000000 as best master
ptp4l[2541.231]: assuming the grand master role

Verified on linuxptp-2.0-5.el8.x86_64:
[root@dell-per740-46 ~]# ptp4l -i lo -mS &
[1] 17844
[root@dell-per740-46 ~]# ptp4l[463.819]: port 1: INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[463.820]: port 0: INITIALIZING to LISTENING on INIT_COMPLETE
ptp4l[471.000]: port 1: LISTENING to MASTER on ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES
ptp4l[471.000]: selected local clock 000000.fffe.000000 as best master
ptp4l[471.000]: assuming the grand master role
[root@dell-per740-46 ~]# socat udp4:127.0.0.1:320,shut-null /dev/null  <------- send message here
ptp4l[718.866]: port 1: bad message
[root@dell-per740-46 ~]# 
[root@dell-per740-46 ~]# rpm -q linuxptp
linuxptp-2.0-5.el8.x86_64
[root@dell-per740-46 ~]#
Comment 7 errata-xmlrpc 2020-11-04 02:45:41 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (linuxptp bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2020:4661