Ubuntu
weechat package

weechat python.so not linked against libpython3 (undefined symbol: _Py_NoneStruct)

Bug #1866065 reported by Paulo Flabiano Smorigo
42
This bug affects 8 people
Affects Status Importance Assigned to Milestone
weechat (Ubuntu)
Fix Released
Undecided
TJ

Bug Description

I updated to focal this week and weechat fails to load python plugins. It shows the following message:

Error: unable to load plugin "/usr/lib/x86_64-linux-gnu/weechat/plugins/python.so":
/usr/lib/x86_64-linux-gnu/weechat/plugins/python.so: undefined symbol: _Py_NoneStruct

There was an update yesterday but it doesn't fixed this problem.

Tags: patch

CVE References

Revision history for this message
Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in weechat (Ubuntu):
status: New → Confirmed
Revision history for this message
David Britton (dpb) wrote :

https://bugzilla.redhat.com/show_bug.cgi?id=1656633

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David Britton (dpb) wrote :

Appears this works around it on up to date focal:

  LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libpython3.8.so weechat

I'm guessing something messed up in the linking of the python.so that ships with weechat-python

Revision history for this message
Marcelo Cerri (mhcerri) wrote :

I had to use `LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libpython3.8.so.1 weechat` instead but the workaround worked to me.

Revision history for this message
TJ (tj) wrote :

The problem here is the build isn't linking against libpython3

$ ldd /usr/lib/x86_64-linux-gnu/weechat/plugins/python.so
        linux-vdso.so.1 (0x00007ffd8eb94000)
        libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f1ae4b37000)
        /lib64/ld-linux-x86-64.so.2 (0x00007f1ae4d83000)

summary: - weechat can't load python plugins (undefined symbol: _Py_NoneStruct)
+ weechat python.so not linked against libpython3 (undefined symbol:
+ _Py_NoneStruct)
Revision history for this message
TJ (tj) wrote :

This is a partial cherry-pick of 76c6f52e8 but modified to remove the earlier FreeBSD modifications introduced in 5c8ac69f7.

The problem was that the python3.8 pkgconfig moved the libdir variable from python3.8 to python3.8-embed so this needs to be checked first in cmake/FindPython.cmake

Changed in weechat (Ubuntu):
assignee: nobody → TJ (tj)
status: Confirmed → In Progress
Revision history for this message
Ubuntu Foundations Team Bug Bot (crichton) wrote :

The attachment "python3: correctly find and link against libpython3.8" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

tags: added: patch
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TJ (tj) wrote :
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TJ (tj) wrote :

See also additional patches address CVE-2020-8955 in Bug #1872425

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Matthias Klose (doko) wrote :

Python extensions are not linked anymore against libpython in 3.8. If weechat embeds an interpreter, then it has to link against it.

Revision history for this message
TJ (tj) wrote :

So is this being left broken then? This is a regression.

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rww (rww-deactivatedaccount) wrote :

Bug confirmed in version 2.6-2ubuntu1 (currently in focal/universe). I tested 2.6-2ubuntu2 (currently in focal-proposed/universe) and confirmed that it's fixed there.

Changed in weechat (Ubuntu):
status: In Progress → Fix Committed
Revision history for this message
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package weechat - 2.6-2ubuntu2

---------------
weechat (2.6-2ubuntu2) focal; urgency=medium

  * Correctly find and link against libpython3.8 (LP: #1866065)
  * CVE-2020-8955 fix crashes when receiving malformed messages
    (LP: #1872425)

 -- Tj <email address hidden> Mon, 13 Apr 2020 10:21:33 +0100

Changed in weechat (Ubuntu):
status: Fix Committed → Fix Released
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