Koichi98

GSoC22 Linuxulator on powerpc64

Summary

FreeBSD provides optional binary compatibility with Linux, allowing users to install and run unmodified Linux binaries. The Linux binaries can be started in the same way native FreeBSD binaries can. They behave almost exactly like native processes and can be traced and debugged the usual way. The "Linuxulator" is available for the i386, amd64, and arm64 architectures. This project aimed to add preliminary Linuxulator support for FreeBSD/powerpc64. Signal handling and vdso are supported, and many system calls for powerpc64 are supported.

Mentors

A big thanks to my mentors. Without their help, this would have not been possible. They helped me a lot when I got stuck and patiently taught me when I didn't understand something.

• Justin Hibbits
• Dmitry Chagin

noseka1

How to disable AAAA lookups?

Problem description

The corporate DNS server that is outside of our control doesn't handle AAAA queries properly. When sent a AAAA query, the DNS server doesn't respond. A properly working DNS server returns NOERROR, ANSWER: 0, if there is no AAAA record for a given name. Misconfigured DNS server doesn't send any response.

In an IPv6-enabled environment, the client tries to resolve both A and AAAA addresses. If the DNS server doesn't send any reply, the client repeats the query and eventually times out. Only after the AAAA query times out, the client will use the A address. Waiting for the timeouts renders utilities like curl, kubectl, oc, ... and others unusable.

Identifying the AAAA lookup problem

chrisdone

Common

export OPT=/opt
export BUILDS=/some/where/mini_linux
mkdir -p $BUILDS

Linux kernel