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tracingpolicy: add BPF operations support #2943

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merged 5 commits into from
Sep 30, 2024
Merged

tracingpolicy: add BPF operations support #2943

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d8c2763
api:proto: add BPF cmds definition
tixxdz Sep 20, 2024
44ca8cb
api:crds: add bpf_cmd arg definition
tixxdz Sep 20, 2024
69fd4b2
kprobes: add userspace types used for pretty printing
tixxdz Sep 25, 2024
49c88fe
grpc: export BpfCmd enum type in events
tixxdz Sep 25, 2024
f1a4175
test: add bpf cmd tests
tixxdz Sep 22, 2024
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64 changes: 64 additions & 0 deletions pkg/sensors/tracing/kprobe_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -6970,3 +6970,67 @@ tetragon_missed_prog_probes_total{attach="wake_up_new_task",policy="__base__"} 0
prometheus.BuildFQName(consts.MetricsNamespace, "", "missed_prog_probes_total")))

}

func TestKprobeBpfCmd(t *testing.T) {
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So I guess the idea of the test is to detect the tetragon bpf program / map loading?

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Yes kept it small, but it can be used to detect all bpf commands.

var doneWG, readyWG sync.WaitGroup
defer doneWG.Wait()

ctx, cancel := context.WithTimeout(context.Background(), tus.Conf().CmdWaitTime)
defer cancel()

hook := `apiVersion: cilium.io/v1alpha1
kind: TracingPolicy
metadata:
name: "bpf-cmd"
spec:
kprobes:
- call: "security_bpf"
syscall: false
args:
- index: 0
type: "bpf_cmd"
`
createCrdFile(t, hook)

obs, err := observertesthelper.GetDefaultObserverWithFile(t, ctx, testConfigFile, tus.Conf().TetragonLib, observertesthelper.WithMyPid())
if err != nil {
t.Fatalf("GetDefaultObserverWithFile error: %s", err)
}
observertesthelper.LoopEvents(ctx, t, &doneWG, &readyWG, obs)
readyWG.Wait()

time.Sleep(1 * time.Second)
err = loadTestCrd()
if err != nil {
t.Fatalf("Loading test CRD failed: %s", err)
}

mapCreate := ec.NewProcessKprobeChecker("").
WithFunctionName(sm.Full("security_bpf")).
WithArgs(ec.NewKprobeArgumentListMatcher().
WithValues(
ec.NewKprobeArgumentChecker().WithBpfCmdArg(tetragon.BpfCmd_BPF_MAP_CREATE),
),
)

progLoad := ec.NewProcessKprobeChecker("").
WithFunctionName(sm.Full("security_bpf")).
WithArgs(ec.NewKprobeArgumentListMatcher().
WithValues(
ec.NewKprobeArgumentChecker().WithBpfCmdArg(tetragon.BpfCmd_BPF_PROG_LOAD),
),
)

btfLoad := ec.NewProcessKprobeChecker("").
WithFunctionName(sm.Full("security_bpf")).
WithArgs(ec.NewKprobeArgumentListMatcher().
WithValues(
ec.NewKprobeArgumentChecker().WithBpfCmdArg(tetragon.BpfCmd_BPF_BTF_LOAD),
),
)

checker := ec.NewUnorderedEventChecker(mapCreate, progLoad, btfLoad)

err = jsonchecker.JsonTestCheck(t, checker)
assert.NoError(t, err)
}
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