Add ABI0 support to Go crypto/tls eBPF tracer

[mertyildiran]

Adds vmlinux.h for x86 and ARM64 which is generated by the command below in the machines with the corresponding architecture:

bpftool btf dump file /sys/kernel/btf/vmlinux format c > vmlinux_x86.h
bpftool btf dump file /sys/kernel/btf/vmlinux format c > vmlinux_arm64.h

that contains the declaration of struct task_struct. The struct is needed to get the Goroutine ID from thread-local storage. It's described in the ABI0 specs.

Go ABI0 (<=1.16) specification
https://go.dev/doc/asm

task_struct, CO-RE and cilium/ebpf

The heap-like area for struct task_struct requires ring buffer. It means that; the PR increases the minimum supported Linux kernel version from 4.10 to 5.8.

We read task_struct using BPF_CORE_READ. Its member thread is a thread_struct and thread_struct is different in kernel versions older than or equal to 4.6.

But cilium/ebpf does not support .kconfig:

extern int LINUX_KERNEL_VERSION __kconfig;

Therefore; for now, we build object files per kernel version and load them accordingly.

Possible TODOs for this subject;

• cilium/cilium tags images per kernel version. So, do the same thing.
• Wait cilium/ebpf to add .kconfig support. (uncertain)
• Don't use cilium/ebpf or fork it.

Check Lists

Tested

• OpenSSL works on x86_64
• OpenSSL works on ARM64
• Go ABI0 works on x86_64
• Go ABI0 works on ARM64
• Go ABIInternal works on x86_64
• Go ABIInternal works on ARM64

Build Strategies

• BUILDARCH=amd64 TARGETARCH=amd64
• BUILDARCH=arm64v8 TARGETARCH=arm64v8
• BUILDARCH=amd64 TARGETARCH=arm64v8
• BUILDARCH=arm64v8 TARGETARCH=amd64

Test Reference

kubeshark/sock-shop-demo#23

[codecov]

Codecov Report

Merging #1169 (17c53ae) into develop (f3a6b3a) will decrease coverage by 17.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           develop    #1169       +/-   ##
============================================
- Coverage    45.17%   28.16%   -17.02%     
============================================
  Files          137       64       -73     
  Lines        13255     5252     -8003     
============================================
- Hits          5988     1479     -4509     
+ Misses        6839     3686     -3153     
+ Partials       428       87      -341     

Impacted Files	Coverage Δ
cli/cmd/checkRunner.go
tap/extensions/amqp/spec091.go
tap/extensions/redis/errors.go
cli/mizu/version/versionCheck.go
cli/config/configStructs/logsConfig.go
cli/cmd/check/kubernetesVersion.go
tap/extensions/kafka/request.go
tap/extensions/kafka/main.go
tap/extensions/kafka/reflect.go
tap/extensions/amqp/read.go
... and 64 more

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[mertyildiran]

PR description is updated.

[nimrod-up9]

Approved, except maybe remove support for kernel 4.6. See slack discussion.