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[GH-ISSUE #5748] firejail --appimage doesn't have supplementary groups required for device access #3083

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opened 2026-05-05 09:43:27 -06:00 by gitea-mirror · 6 comments
gitea-mirror commented 2026-05-05 09:43:27 -06:00
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Originally created by @amano-kenji on GitHub (Mar 23, 2023).
Original GitHub issue: https://github.com/netblue30/firejail/issues/5748

Steps to Reproduce

  1. Download https://github.com/DCurrent/openbor/releases/download/v6391/OpenBOR.v3.0.Build.6391.7z
  2. Extract it
  3. Go to LINUX/OpenBOR
  4. Run LC_ALL=C firejail --appimage --noprofile ./OpenBOR_3.0_6391.AppImage
  5. (Optional) Insert any .pak file from https://openborgames.com/ into Paks folder
  6. (Optional) Open a game.
  7. (Optional) Close the game.

Expected behavior

ALSA should work. Input devices like game pads should be recognized.

Actual behavior

Device availability is random. Devices are sometimes accessible. Sometimes, they are not.

Parent pid 26782, child pid 26785

** Warning: dropping all Linux capabilities and setting NO_NEW_PRIVS prctl **

Mounting appimage type 2
Child process initialized in 17.45 ms
ALSA lib /path/to/alsa-lib-1.2.8/src/confmisc.c:165:(snd_config_get_card) Cannot get card index for D10s
ALSA lib /path/to/alsa-lib-1.2.8/src/confmisc.c:165:(snd_config_get_card) Cannot get card index for D10s

Game pads are sometimes recognized.

Additional context

I work around this issue by extracting files from appimage and executing the embedded executable directly with firejail.

Environment

  • Linux distribution and version: Gentoo Linux
  • Firejail version (firejail --version)
firejail version 0.9.72

Compile time support:
	- always force nonewprivs support is disabled
	- AppArmor support is enabled
	- AppImage support is enabled
	- chroot support is enabled
	- D-BUS proxy support is enabled
	- file transfer support is enabled
	- firetunnel support is disabled
	- IDS support is disabled
	- networking support is enabled
	- output logging is enabled
	- overlayfs support is disabled
	- private-home support is enabled
	- private-cache and tmpfs as user enabled
	- SELinux support is disabled
	- user namespace support is enabled
	- X11 sandboxing support is enabled

Checklist

  • The issues is caused by firejail (i.e. running the program by path (e.g. /usr/bin/vlc) "fixes" it).
  • I can reproduce the issue without custom modifications (e.g. globals.local).
  • The program has a profile. (If not, request one in https://github.com/netblue30/firejail/issues/1139)
  • The profile (and redirect profile if exists) hasn't already been fixed upstream.
  • I have performed a short search for similar issues (to avoid opening a duplicate).
    • I'm aware of browser-allow-drm yes/browser-disable-u2f no in firejail.config to allow DRM/U2F in browsers.
  • I used --profile=PROFILENAME to set the right profile. (Only relevant for AppImages)
Originally created by @amano-kenji on GitHub (Mar 23, 2023). Original GitHub issue: https://github.com/netblue30/firejail/issues/5748 ### Steps to Reproduce 1. Download https://github.com/DCurrent/openbor/releases/download/v6391/OpenBOR.v3.0.Build.6391.7z 2. Extract it 3. Go to LINUX/OpenBOR 4. Run `LC_ALL=C firejail --appimage --noprofile ./OpenBOR_3.0_6391.AppImage` 5. (Optional) Insert any `.pak` file from https://openborgames.com/ into `Paks` folder 6. (Optional) Open a game. 7. (Optional) Close the game. ### Expected behavior ALSA should work. Input devices like game pads should be recognized. ### Actual behavior Device availability is random. Devices are sometimes accessible. Sometimes, they are not. ``` Parent pid 26782, child pid 26785 ** Warning: dropping all Linux capabilities and setting NO_NEW_PRIVS prctl ** Mounting appimage type 2 Child process initialized in 17.45 ms ALSA lib /path/to/alsa-lib-1.2.8/src/confmisc.c:165:(snd_config_get_card) Cannot get card index for D10s ALSA lib /path/to/alsa-lib-1.2.8/src/confmisc.c:165:(snd_config_get_card) Cannot get card index for D10s ``` Game pads are sometimes recognized. ### Additional context I work around this issue by extracting files from appimage and executing the embedded executable directly with firejail. ### Environment - Linux distribution and version: Gentoo Linux - Firejail version (`firejail --version`) ``` firejail version 0.9.72 Compile time support: - always force nonewprivs support is disabled - AppArmor support is enabled - AppImage support is enabled - chroot support is enabled - D-BUS proxy support is enabled - file transfer support is enabled - firetunnel support is disabled - IDS support is disabled - networking support is enabled - output logging is enabled - overlayfs support is disabled - private-home support is enabled - private-cache and tmpfs as user enabled - SELinux support is disabled - user namespace support is enabled - X11 sandboxing support is enabled ``` ### Checklist - [x] The issues is caused by firejail (i.e. running the program by path (e.g. `/usr/bin/vlc`) "fixes" it). - [x] I can reproduce the issue without custom modifications (e.g. globals.local). - [x] The program has a profile. (If not, request one in `https://github.com/netblue30/firejail/issues/1139`) - [x] The profile (and redirect profile if exists) hasn't already been fixed [upstream](https://github.com/netblue30/firejail/tree/master/etc). - [x] I have performed a short search for similar issues (to avoid opening a duplicate). - [x] I'm aware of `browser-allow-drm yes`/`browser-disable-u2f no` in `firejail.config` to allow DRM/U2F in browsers. - [x] I used `--profile=PROFILENAME` to set the right profile. (Only relevant for AppImages)
gitea-mirror 2026-05-05 09:43:27 -06:00
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gitea-mirror commented 2026-05-05 09:43:30 -06:00
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@amano-kenji commented on GitHub (Mar 28, 2023):

I finally found a way to get a shell inside appimage sandbox. I will figure out what went wrong.

<!-- gh-comment-id:1487021672 --> @amano-kenji commented on GitHub (Mar 28, 2023): I finally found a way to get a shell inside appimage sandbox. I will figure out what went wrong.
gitea-mirror commented 2026-05-05 09:43:31 -06:00
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@rusty-snake commented on GitHub (Mar 28, 2023):

If ALSA requires permissions via supplementary groups, the usage of --appimagr is the cause.

<!-- gh-comment-id:1487025117 --> @rusty-snake commented on GitHub (Mar 28, 2023): If ALSA requires permissions via supplementary groups, the usage of --appimagr is the cause.
gitea-mirror commented 2026-05-05 09:43:31 -06:00
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@amano-kenji commented on GitHub (Mar 28, 2023):

I discovered that with --appimage, I do not belong in audio group.
Without --appimage, I belong in audio group.
ALSA requires membership in audio group.

<!-- gh-comment-id:1487035504 --> @amano-kenji commented on GitHub (Mar 28, 2023): I discovered that with `--appimage`, I do not belong in `audio` group. Without `--appimage`, I belong in `audio` group. ALSA requires membership in `audio` group.
gitea-mirror commented 2026-05-05 09:43:32 -06:00
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@amano-kenji commented on GitHub (Mar 28, 2023):

I still don't understand how OpenBOR still has access to ALSA without being in audio group.
However, its access to ALSA is random at best.

Weirdly, game pads are available randomly in appimage sandbox.

<!-- gh-comment-id:1487036807 --> @amano-kenji commented on GitHub (Mar 28, 2023): I still don't understand how OpenBOR still has access to ALSA without being in `audio` group. However, its access to ALSA is random at best. Weirdly, game pads are available randomly in appimage sandbox.
gitea-mirror commented 2026-05-05 09:43:33 -06:00
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@amano-kenji commented on GitHub (Mar 28, 2023):

What can be done with --appimage, then?

<!-- gh-comment-id:1487037463 --> @amano-kenji commented on GitHub (Mar 28, 2023): What can be done with `--appimage`, then?
gitea-mirror commented 2026-05-05 09:43:34 -06:00
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@amano-kenji commented on GitHub (Mar 30, 2023):

This is a duplicate of https://github.com/netblue30/firejail/issues/4951

<!-- gh-comment-id:1489709357 --> @amano-kenji commented on GitHub (Mar 30, 2023): This is a duplicate of https://github.com/netblue30/firejail/issues/4951
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