** Changed in: chromium-browser (Ubuntu)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1780678
Title:
[snap] Chromium cannot use WebUSB
Status in chromium-browser package in Ubuntu:
Fix Released
Bug description:
We're running into a weird bug on Ubuntu : WebUSB works on Chrome but
doesn't on Chromium!
Here's our udev rule:
https://workshop.numworks.com/files/drivers/linux/50-numworks-
calculator.rules
It uses the uaccess tag which adds an ACL to the created file in /dev/
so that the current logged-in user has RW access to the corresponding
/dev/bus/usb/** device. Apparently that's the way to go, since relying
on groups is fragile (not all distros use the "plugdev" group for
example).
That udev rules works just fine. When using a command-line utility
such as "dfu-tool", the USB device is seen and can be read from and
written to. It also works just fine on Chrome. But Chromium gives us
an "access denied" error. It lists the device, we do get the pop-up,
but we cannot communicate. On Chromium, chrome://device-log says :
Failed to open /dev/bus/usb/001/011: Operation not permitted (1)
Here are the infos on said file:
user@virtualbox:~$ ls -l /dev/bus/usb/001/011
crw-rw-r--+ 1 root root 189, 10 Jul 3 11:35 /dev/bus/usb/001/011
As you can see, the file is owned root/root, but has an ACL (as shown
by the "+" symbol)
user@virtualbox:~$ getfacl /dev/bus/usb/001/011
getfacl: Removing leading '/' from absolute path names
# file: dev/bus/usb/001/011
# owner: root
# group: root
user::rw-
user:user:rw-
group::rw-
mask::rw-
other::r--
Here the ACL supposedely gives RW access to "user" who is indeed the
current logged-in user, and the user running Chromium and Chrome.
For reference :
- Latest stable Ubuntu (18.04)
- Using the Chromium that ships with Ubuntu (from the Ubuntu Software app.
attached chrome://version page)
- And using latest stable Chrome from google.com (attached chrome://version
page)
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