[FS#4154] procd-ujail: makes dnsmasq refuse to answer dns queries

OpenWrt Bugs openwrt-bugs at lists.openwrt.org
Wed Nov 24 01:26:29 PST 2021


A new Flyspray task has been opened.  Details are below. 

User who did this - william wortel (wwortel) 

Attached to Project - OpenWrt/LEDE Project
Summary - procd-ujail: makes dnsmasq refuse to answer dns queries
Task Type - Bug Report
Category - Base system
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - 22/11/2021 compile for ramips device Ubiquiti EdgeRouter X sfp ; snapshot: r18166-e2c4998f6d
Choosing TARGET_ramips_mt7621_DEVICE_ubnt_edgerouter-x-sfp selects default the inclusion of procd-ujail .
This has the effect of dnsmasq being put in a jail.
The device can still make dns queries to upstream. But, depite dnsmasq listening on all interfaces, any incoming queries get the reply 'REFUSED'. Easily tested on the device itself e.g. with the command 'nslookup  localhost'
This leaves any devices downstream in the dark that via dhcp got the news to fetch their dns information from this jailed dnsmasq.
Exactly same configuration compile, but with procd-ujail manually removed, restores complete functionality of dnsmasq.


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