[Bug 1840772] [NEW] Script cannot access network when triggered by udev rule
Launchpad Bug Tracker
1840772 at bugs.launchpad.net
Thu Aug 6 21:14:41 UTC 2020
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I have a script that is triggered by a udev rule, and that needs to
connect to a remote host.
The example below works fine in 16.04, but fails in 18.04. It seems that
the process executing the script is somehow limited wrt. network access.
The script works fine when started from a shell prompt.
To reproduce:
- create /tmp/myscript:
#/bin/sh
wget -o /tmp/wget.log -O /tmp/index.html http://www.google.com
- create /etc/udev/rules.d/52-netaccess.rules
ACTION=="add", ATTRS{idVendor}=="cafe", MODE="0660", GROUP="root",
SUBSYSTEM=="usbmisc", RUN+="/tmp/myscript"
- Plugin a USB device with vendor ID 0xcafe, and check the wget output in /tmp/wget.log.
On ubuntu 18.04 wget fails with this output:
--2019-08-19 14:49:43-- http://www.google.com/
Resolving www.google.com (www.google.com)... failed: Name or service not known.
wget: unable to resolve host address 'www.google.com'
If I use an IP address in the URL there is no resolve error, but then wget blocks in the socket connect() syscall (according to strace). At some point the script is killed.
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
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Script cannot access network when triggered by udev rule
https://bugs.launchpad.net/bugs/1840772
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