We need to update the eBPF library so that we can get the raw syscall
errors from bpf(2) syscalls using errors.Is.
Signed-off-by: Aleksa Sarai <cyphar@cyphar.com>
(cherry picked from commit fe518a0678)
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
The `errors.Is(err, unix.EINVAL)` check in `haveBpfProgReplace()` was
broken because the `cilium/ebpf` library did not "wrap" errors.
https://github.com/cilium/ebpf/blob/v0.6.0/link/program.go#L72
So the eBPF support of runc was broken for kernel prior to 5.6.
This commit bumps up cilium/ebpf to contain cilium/ebpf PR 320.
Fix opencontainers/runc issue 3008
Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
full diff: https://github.com/cilium/ebpf/compare/v0.4.0...v0.5.0
Breaking changes
------------------------------------------
All LoadPinned*() functions now take LoadPinOptions to control loader behaviour.
Simply pass nil to load with default options.
- LoadPinnedMap()
- LoadPinnedProgram()
- LoadPinnedCgroup()
- LoadPinnedIter()
- LoadPinnedRawLink()
- LoadPinnedNetNs()
Bug fixes
------------------------------------------
- Program.IsPinned() now behaves correctly on maps loaded from bpffs
- Map.Pin() no longer clobbers the destination file if it already exists
Features
------------------------------------------
- Attaching to k(ret)probes and tracepoints can now be done with link.Kprobe(),
link.Kretprobe() and link.Tracepoint()
- Programs of type Kprobe automatically get their KernelVersion fields populated
by detecting the kernel version at runtime
- MapOptions now contains a LoadPinOptions
- ProgSpec now contains a Flags field, adding support for BPF_F_SLEEPABLE
- Made BTF map loader more flexible by looping over Vars in a BTF data section
- Pinned Maps and Programs can now be loaded from bpffs in read-or write-only mode
- Added golangci-lint project configuration, running in CI
Examples
------------------------------------------
kprobe and tracepoint examples updated to use the new link.Kprobe() and link.Tracepoint() API
There is now an example for how to attach eBPF programs to uprobes
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Caught by golangci-lint when enabling golint:
libcontainer/cgroups/ebpf/ebpf.go:35:12: SA1019: prog.Attach is deprecated: use link.RawAttachProgram instead. (staticcheck)
if err := prog.Attach(dirFD, ebpf.AttachCGroupDevice, unix.BPF_F_ALLOW_MULTI); err != nil {
^
libcontainer/cgroups/ebpf/ebpf.go:39:13: SA1019: prog.Detach is deprecated: use link.RawDetachProgram instead. (staticcheck)
if err := prog.Detach(dirFD, ebpf.AttachCGroupDevice, unix.BPF_F_ALLOW_MULTI); err != nil {
^
Worth noting that we currently call prog.Detach() with unix.BPF_F_ALLOW_MULTI;
https://github.com/golang/sys/blob/22da62e12c0cd9c1da93581e1113ca4d82a5be14/unix/zerrors_linux.go#L178
BPF_F_ALLOW_MULTI = 0x2
Looking at the source code for prog.Detach(); https://github.com/cilium/ebpf/blob/v0.4.0/prog.go#L579-L581,
this would _always_ produce an error:
if flags != 0 {
return errors.New("flags must be zero")
}
Note that the flags parameter is not used (except for that validation)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
full diff: https://github.com/cilium/ebpf/compare/v0.1.0...v0.2.0
- btf: add go-fuzz targets
- btf: avoid Type copy in FuncProto.walk
- btf: check err in loadSpecFromVmlinux
- btf: handle type name flavours
- CI: test on 5.9 kernel
- cmd/bpf2go: output ELF .o next to the .go file
- link: add AttachSkLookup
- Remove two unused functions
- Support LSM attach
- use buffered I/O to cut down on read syscalls
- Various doc link fixes
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
This removes vndr, and swiches to native Go Modules instead. All modules
are kept on the old version.
Keeps the vendor/ dir, so everything is backwards compatible.
Signed-off-by: Odin Ugedal <odin@ugedal.com>
Aleksa Sarai