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[GH-ISSUE #313] Firejail and libpng / setjmp(png_jmpbuf) (cannot save PNG) #221

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opened 2026-05-05 05:20:54 -06:00 by gitea-mirror · 6 comments

gitea-mirror commented

2026-05-05 05:20:54 -06:00

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Originally created by @Sidnioulz on GitHub (Feb 21, 2016).
Original GitHub issue: https://github.com/netblue30/firejail/issues/313

I cannot save PNG files from within a Firejail sandbox. Tested with xfce4-screenshooter, and with GIMP. The issue appears to be that the setjmp(png_jmpbuf) system call fails, inside gdk-pixbuf's implementation of PNG file saving (see io-png.c::real_save_png for the implementation).

Originally created by @Sidnioulz on GitHub (Feb 21, 2016). Original GitHub issue: https://github.com/netblue30/firejail/issues/313 I cannot save PNG files from within a Firejail sandbox. Tested with xfce4-screenshooter, and with GIMP. The issue appears to be that the setjmp(png_jmpbuf) system call fails, inside gdk-pixbuf's implementation of PNG file saving (see io-png.c::real_save_png for the implementation).

gitea-mirror

2026-05-05 05:20:54 -06:00

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gitea-mirror commented

2026-05-05 05:21:02 -06:00

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@netblue30 commented on GitHub (Feb 21, 2016):

How do you run it? Are you starting GIMP/xfce4-screenshooter from Firefox?

@netblue30 commented on GitHub (Feb 21, 2016): How do you run it? Are you starting GIMP/xfce4-screenshooter from Firefox?

gitea-mirror commented

2026-05-05 05:21:05 -06:00

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@Sidnioulz commented on GitHub (Feb 21, 2016):

I usually just firejail into a Bash session and work from there. The problem occurs with or without the generic profile, and regardless of whether I spawn a bash and work from the Bash or call the apps directly (e.g. firejail gimp).

@Sidnioulz commented on GitHub (Feb 21, 2016): I usually just firejail into a Bash session and work from there. The problem occurs with or without the generic profile, and regardless of whether I spawn a bash and work from the Bash or call the apps directly (e.g. firejail gimp).

gitea-mirror commented

2026-05-05 05:21:08 -06:00

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@netblue30 commented on GitHub (Feb 22, 2016):

What distro are you running? I doesn't happen on on Debian 8. Also, what project is io-png.c::real_save_png coming from, I'd like to take a look. Thanks!

@netblue30 commented on GitHub (Feb 22, 2016): What distro are you running? I doesn't happen on on Debian 8. Also, what project is io-png.c::real_save_png coming from, I'd like to take a look. Thanks!

gitea-mirror commented

2026-05-05 05:21:11 -06:00

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@Sidnioulz commented on GitHub (Feb 22, 2016):

I'm running ArchLinux,4.3.3-2-ARCH #1 SMP PREEMPT Wed Dec 23 20:09:18 CET 2015 x86_64 GNU/Linux.

https://git.gnome.org/browse/gdk-pixbuf/tree/gdk-pixbuf/io-png.c would contain said code. If you can't reproduce I can try and identify the faulty code lines in GIMP's xcf/jpg saving routines too, albeit not immediately.

@Sidnioulz commented on GitHub (Feb 22, 2016): I'm running ArchLinux,4.3.3-2-ARCH #1 SMP PREEMPT Wed Dec 23 20:09:18 CET 2015 x86_64 GNU/Linux. https://git.gnome.org/browse/gdk-pixbuf/tree/gdk-pixbuf/io-png.c would contain said code. If you can't reproduce I can try and identify the faulty code lines in GIMP's xcf/jpg saving routines too, albeit not immediately.

gitea-mirror commented

2026-05-05 05:21:14 -06:00

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@netblue30 commented on GitHub (Feb 24, 2016):

I'll look into it, thanks!

@netblue30 commented on GitHub (Feb 24, 2016): I'll look into it, thanks!

gitea-mirror commented

2026-05-05 05:21:16 -06:00

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@Fred-Barclay commented on GitHub (Oct 7, 2017):

I can create/save .png images with Gimp or mate-screenshot, using the gimp and default profiles, on 64-bit Arch running the 4.13 kernel. Let's close for now. 😄

@Fred-Barclay commented on GitHub (Oct 7, 2017): I can create/save .png images with Gimp or mate-screenshot, using the gimp and default profiles, on 64-bit Arch running the 4.13 kernel. Let's close for now. 😄

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Reference: github-starred/firejail#221

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