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feat: Add vmlinux for kernel 5.15 for arm & amd #26

Merged
merged 10 commits into from
Aug 2, 2023
Merged

feat: Add vmlinux for kernel 5.15 for arm & amd #26

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42f0a4c
add amd64 vmlinux.h
MikeGoldsmith Jul 15, 2023
543987b
add arm64 vmlinux
MikeGoldsmith Jul 17, 2023
4b22c41
add developing md with steps to create vmlinux.h
MikeGoldsmith Jul 17, 2023
dce1d96
Merge branch 'main' into mike/vmlinux
JamieDanielson Jul 25, 2023
f299246
add ifdef to pull in vmlinux file based on arch
JamieDanielson Jul 31, 2023
1cfefdf
smol cleanup
JamieDanielson Jul 31, 2023
87e0fc7
Merge branch 'main' of github.com:honeycombio/honeycomb-ebpf-agent in…
MikeGoldsmith Aug 1, 2023
7faf7c8
reorganise vmlinux files
MikeGoldsmith Aug 2, 2023
7fb1172
add BPF_NO_PRESERVE_ACCESS_INDEX to avoid CO-RE
JamieDanielson Aug 2, 2023
368eadc
add mac-build target for k8s on docker for mac
JamieDanielson Aug 2, 2023
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13 changes: 13 additions & 0 deletions DEVELOPING.md
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Expand Up @@ -127,3 +127,16 @@ mount | grep -i debugfs
cat /sys/kernel/debug/tracing/trace_pipe
# look around sys/kernel/debug
```

## Generating vmlinux.h files

`vmlinux.h` files contain all the linux types and structs to interop with a linux OS, e.g. the raw Socket class.

We need a version for each supported architecture (eg arm & amd) and it's generated from a real linux distro.

Steps to generate `vmlinux.h` files:

- Start a ubuntu VM (not docker, use virtualbox, multipass, ec2, etc)
- Install additional linux commands so libbpf can work - `apt install linux-tools-$(uname -r)`
- Use libbpf to generate the vmlinux.h file - `bpftool btf dump file /sys/kernel/btf/vmlinux format c`
- Check in output vmlinux.h, note which architecture in file format - eg `bpf/headers/vmlinux-arm64.h`
2 changes: 1 addition & 1 deletion Makefile
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Expand Up @@ -9,7 +9,7 @@ IMG_NAME ?= hny/ebpf-agent
IMG_TAG ?= local

.PHONY: generate
generate: export CFLAGS := $(BPF_HEADERS)
generate: export CFLAGS := $(BPF_HEADERS) -DBPF_NO_PRESERVE_ACCESS_INDEX
generate:
go generate ./...

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