This bug was fixed in the package brltty - 5.5-4ubuntu2.0.1
---
brltty (5.5-4ubuntu2.0.1) bionic; urgency=medium
* debian/patches/policykit-fix:
- backport fix for polkit authentication following CVE-2018-1116
(lp: #1782320)
-- Sebastien Bacher Wed, 29 Aug 2018
thanks for testing!
** Tags removed: verification-needed verification-needed-bionic
** Tags added: verification-done verification-done-bionic
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Have tested the brltty package in bionic-proposed as instructed in
comment #12: v5.5-4ubuntu2.0.1
It works as expected.
After commenting out the "api-parameters Auth=keyfile" line in
brltty.conf and restarting the machine (just to be sure), my braille
display works completely in both text
This bug was fixed in the package brltty - 5.6-5ubuntu1
---
brltty (5.6-5ubuntu1) cosmic; urgency=medium
* Merged fixes from Debian, including the patch to work with the
current polkit version (lp: #1782320)
brltty (5.6-5) unstable; urgency=medium
* patches/atspi2-shutdown:
Hello Frans-Willem, or anyone else affected,
Accepted brltty into bionic-proposed. The package will build now and be
available at
https://launchpad.net/ubuntu/+source/brltty/5.5-4ubuntu2.0.1 in a few
hours, and then in the -proposed repository.
Please help us by testing this new package. See
** Changed in: brltty (Ubuntu Bionic)
Importance: Undecided => High
** Changed in: brltty (Ubuntu Bionic)
Assignee: (unassigned) => Sebastien Bacher (seb128)
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This is not yet fixed in cosmic as version 5.6-5ubuntu1 is still in
-proposed.
** Also affects: brltty (Ubuntu Bionic)
Importance: Undecided
Status: New
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** Changed in: brltty (Ubuntu)
Status: Confirmed => Fix Committed
** Changed in: brltty (Ubuntu)
Importance: Undecided => High
** Description changed:
+ * Impact
+
+ Since the fix for CVE-2018-1116 in policykit-1 the braille display
+ doesn't work in graphical UIs
+
+ * Test case
+
>From the upstream policykit bug entry, it is actually a misuse of the
policykit API from brltty. I have uploaded a fix in Debian's brltty
5.6-5.
Ubuntu should definitely include the policykit-fix patch contained in
that 5.6-5 version as an update to ubuntu 18.04, otherwise all blind
users will
Yes, disabling that patch fixes the issue.
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https://bugs.launchpad.net/bugs/1782320
Title:
Braille display inoperable in GUI since polkit-update
Status in
This is most probably due to the introduction of Fix-CVE-2018-1116
-Trusting-client-supplied-UID.patch
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https://bugs.launchpad.net/bugs/1782320
Title:
Braille
I can confirm the same issue on Debian: upgrading from version 0.105-20
to version 0.105-21 brings the same issue.
** CVE added: https://cve.mitre.org/cgi-bin/cvename.cgi?name=2018-1116
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Note: to reproduce the issue, one just needs to install an Ubuntu 18.04
system, start brltty by hand as root with:
sudo brltty -b no
then try to connect to it as normal logged-in user through brlapi:
python3
>>> import brlapi
>>> b = brlapi.Connection()
which shouldn't raise an
This seems to be an issue within policykit itself. Printing the actual
error shows:
GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: process with PID
12570 has been replaced
>From reading the source code, it seems that policykit is checking the
start time of the program and finds a mismatch.
Well, this is not a real solution, we need to fix polkit, otherwise all
users will have the same issue, and we don't want to make them all
revert back to file-based authentication.
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Thanks to a member of the BrlTTY mailing list, my problem is solved. It
seems that the default authorization of BrltTTY under Ubuntu was no
longer working. Providing it with a dummy key-file was enough to get it
back to work - instantly.
The display came back to life immediately after these
Have just replayed the upgrade in a VirtualBox VM using a clean install
of Ubuntu 18.04.
Before the upgrade (of policy-kit), the braille display works (both
output and input).
After the upgrade and reboot, the same errors appear in /var/log/syslog:
Jul 18 11:49:43 test-VirtualBox brltty[409]:
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