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#66 in Unix APIs

Download history 11237/week @ 2024-02-23 12822/week @ 2024-03-01 15053/week @ 2024-03-08 15015/week @ 2024-03-15 14539/week @ 2024-03-22 14747/week @ 2024-03-29 7519/week @ 2024-04-05 6754/week @ 2024-04-12 6328/week @ 2024-04-19 7260/week @ 2024-04-26 5949/week @ 2024-05-03 3011/week @ 2024-05-10 3377/week @ 2024-05-17 5969/week @ 2024-05-24 4566/week @ 2024-05-31 2909/week @ 2024-06-07

17,173 downloads per month


65K SLoC

Change returns success. Going and coming without error. Action brings good fortune.

Shine On You Crazy Diamond! Try to Avoid Chance!

msrv repology build status pipeline status

license maintenance-status dependency status OpenSSF best practices

Syd is a rock-solid user-space kernel to sandbox applications on Linux>=5.19. Syd is similar to Bubblewrap, Firejail, GVisor, and minijail. Syd is secure by default, and intends to provide a simple interface over various intricate Linux sandboxing mechanisms such as LandLock, Namespaces, ptrace, and seccomp-{bpf,notify}. You may run Syd as a regular user, with no extra privileges, and you can even set Syd as your login shell. A brief overview of Syd's capabilities are as follows:

Read the fine manuals of syd, libsyd, gosyd, plsyd, pysyd, rbsyd, syd.el and watch the asciicasts Memory Sandboxing, PID Sandboxing, Network Sandboxing, and Sandboxing Emacs with syd. Join the CTF event at https://ctftime.org/event/2178 and try to read the file /etc/CTF¹ on syd.chesswob.org with ssh user/pass: syd.²

Maintained by Ali Polatel. Up-to-date sources can be found at https://gitlab.exherbo.org/sydbox/sydbox.git and bugs/patches can be submitted to https://gitlab.exherbo.org/groups/sydbox/-/issues. Follow toots with the #sydbox hashtag and discuss in #sydbox on Libera Chat.

¹: SHA256(/etc/CTF)=f1af8d3946546f9d3b1af4fe15f0209b2298166208d51a481cf51ac8c5f4b294

²: Start by reading the CTF sandbox profile.

³: That cat's something I can't explain!


~507K SLoC