Russian military GNU/Linux release: Astra Linux
RusBitTech developed Astra Linux Based On Debian GNU/Linux to meet the information infrastructure security requirements of the Russian army and the Intelligence Department.
Astra Linux claims that its license complies with Russian law and does not violate the GPL free software license.
The source code of Astra Linux can be found here. From the features of 1.1, we can see that in addition to common applications such as Firefox and LibreOffice, Astra has integrated the much-concerned Russian national cryptographic algorithm GOST and a highly customized version based on the Linux 4.2 kernel, from the source code, we can see that it integrates the PaX patch (the Grsecurity part is not found) and is independent from the standard MAC (mandatory access control, SELinux/AppArmor/SMACK/TOMOYO) and the unzipped patch is 97 MB.
In addition to the Astra Linux of the Russian military, French intelligence agencies also use a release version customized Based On Debian + GRSEC.
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