This bug was fixed in the package xdg-desktop-portal-gnome -
44~beta-1ubuntu2
---
xdg-desktop-portal-gnome (44~beta-1ubuntu2) lunar; urgency=medium
* d/p/screencast-Duplicate-monitor-and-window-stream-info.patch:
Cherry-pick. Fix use-after-free crash when window list changes between
being shown and the user making their selection. (cherry picked from
commit b87215b637799ef771289666bd57dd8bb71f7061 in debian/master / 44.0-1
in experimental) (LP: #2012341)
-- Iain Lane Sun, 16 Apr 2023 21:08:30 +0100
** Changed in: xdg-desktop-portal-gnome (Ubuntu Lunar)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/2012341
Title:
xdg-desktop-portal-gnome crashed with SIGSEGV in fast_validate()
Status in xdg-desktop-portal-gnome package in Ubuntu:
Fix Released
Status in xdg-desktop-portal-gnome source package in Lunar:
Fix Released
Bug description:
[ Description ]
Screen sharing via the GNOME portal is often crashing due to a use-
after-free.
[ Fix ]
An upstream cherry-pick (https://gitlab.gnome.org/GNOME/xdg-desktop-
portal-gnome/-/commit/a46d3b338ed362e6dfad359db3d9a505bff0dc9c) which
takes a local copy of the data which can be freed.
[ Test case ]
One way which works for me:
0. Be on GNOME, have a few different programs open (wayland ones, X ones,
snaps, not snaps).
1. Open firefox, visit https://meet.jit.si.
2. Start a meeting with yourself.
3. Share a window into the meeting. You should get the portal dialog asking
you which window to share. Pick any one and share it to the chat.
4. If the bug happens, the window will not be shared, and you should see a
crash if you look in `journalctl --user-unit=xdg-desktop-portal-gnome.service`.
It doesn't happen every single time. If you don't see the bug, repeat
step 3 a few times choosing different windows and with different
timings (wait a few seconds to select the window or do it really
fast).
If the bug is fully fixed, you shouldn't see this crash happen at all
even after trying lots of times.
Make sure you can reproduce the bug before applying the new package,
so you can be more confident it's fixed.
When the crash happens, you see messages in the journal like:
Apr 13 22:33:14 florence xdg-desktop-por[19182]: g_variant_new_string:
assertion 'string != NULL' failed
Apr 13 22:33:16 florence systemd[2468]: xdg-desktop-portal-gnome.service:
Main process exited, code=dumped, status=11/SEGV
[ What could go wrong? ]
The patch introduces new `dup` and `free` functions for a couple of
structs. They are fairly simple but if there's a bug there it could
lead to a leak or a different crash.
[ Original Description ]
Tried to share a window under Wayland with obs-studio (installed from
a deb) and apport popped up saying xdg-desktop-portal-gnome had
crashed.
ProblemType: Crash
DistroRelease: Ubuntu 23.04
Package: xdg-desktop-portal-gnome 44~beta-1ubuntu1
ProcVersionSignature: Ubuntu 6.1.0-16.16-generic 6.1.6
Uname: Linux 6.1.0-16-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.26.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Tue Mar 21 16:25:47 2023
ExecutablePath: /usr/libexec/xdg-desktop-portal-gnome
InstallationDate: Installed on 2021-08-03 (595 days ago)
InstallationMedia: Ubuntu 21.10 "Impish Indri" - Alpha amd64 (20210802)
ProcCmdline: /usr/libexec/xdg-desktop-portal-gnome
ProcEnviron:
LANG=en_AU.UTF-8
LANGUAGE=en_AU:en
PATH=(custom, user)
SHELL=/bin/bash
XDG_RUNTIME_DIR=
SegvAnalysis:
Segfault happened at: 0x7f67fd7a94a0 : movzbl
(%rdi),%eax
PC (0x7f67fd7a94a0) ok
source "(%rdi)" (0xa489eeb5ba526c40) not located in a known VMA region
(needed readable region)!
destination "%eax" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: xdg-desktop-portal-gnome
StacktraceTop:
g_utf8_validate () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
g_variant_new_string () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
() at /lib/x86_64-linux-gnu/libglib-2.0.so.0
() at /lib/x86_64-linux-gnu/libglib-2.0.so.0
g_variant_new_va () at /lib/x86_64-linux-gnu/libglib-2.0.so.0
Title: xdg-desktop-portal-gnome crashed with SIGSEGV in g_utf8_validate()
UpgradeStatus: Upgraded to lunar on 2023-01-27 (52 days ago)
UserGroups: adm cdrom dip libvirt lpadmin lxd plugdev sambashare sbuild sudo
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