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package link
import (
"errors"
"os"
"testing"
"github.com/go-quicktest/qt"
"github.com/cilium/ebpf"
"github.com/cilium/ebpf/internal/testutils"
"github.com/cilium/ebpf/internal/unix"
)
var kprobeMultiSyms = []string{"vprintk", "inet6_release"}
func TestKprobeMulti(t *testing.T) {
testutils.SkipIfNotSupported(t, haveBPFLinkKprobeMulti())
prog := mustLoadProgram(t, ebpf.Kprobe, ebpf.AttachTraceKprobeMulti, "")
km, err := KprobeMulti(prog, KprobeMultiOptions{Symbols: kprobeMultiSyms})
if err != nil {
t.Fatal(err)
}
defer km.Close()
testLink(t, km, prog)
}
func TestKprobeMultiInput(t *testing.T) {
// Program type that loads on all kernels. Not expected to link successfully.
prog := mustLoadProgram(t, ebpf.SocketFilter, 0, "")
// One of Symbols or Addresses must be given.
_, err := KprobeMulti(prog, KprobeMultiOptions{})
if !errors.Is(err, errInvalidInput) {
t.Fatalf("expected errInvalidInput, got: %v", err)
}
// Symbols and Addresses are mutually exclusive.
_, err = KprobeMulti(prog, KprobeMultiOptions{
Symbols: []string{"foo"},
Addresses: []uintptr{1},
})
if !errors.Is(err, errInvalidInput) {
t.Fatalf("expected errInvalidInput, got: %v", err)
}
// One Symbol, two cookies..
_, err = KprobeMulti(prog, KprobeMultiOptions{
Symbols: []string{"one"},
Cookies: []uint64{2, 3},
})
if !errors.Is(err, errInvalidInput) {
t.Fatalf("expected errInvalidInput, got: %v", err)
}
}
func TestKprobeMultiErrors(t *testing.T) {
testutils.SkipIfNotSupported(t, haveBPFLinkKprobeMulti())
prog := mustLoadProgram(t, ebpf.Kprobe, ebpf.AttachTraceKprobeMulti, "")
// Nonexistent kernel symbol.
_, err := KprobeMulti(prog, KprobeMultiOptions{Symbols: []string{"bogus"}})
if !errors.Is(err, os.ErrNotExist) && !errors.Is(err, unix.EINVAL) {
t.Fatalf("expected ErrNotExist or EINVAL, got: %s", err)
}
// Only have a negative test for addresses as it would be hard to maintain a
// proper one.
if _, err := KprobeMulti(prog, KprobeMultiOptions{
Addresses: []uintptr{^uintptr(0)},
}); !errors.Is(err, unix.EINVAL) {
t.Fatalf("expected EINVAL, got: %s", err)
}
}
func TestKprobeMultiCookie(t *testing.T) {
testutils.SkipIfNotSupported(t, haveBPFLinkKprobeMulti())
prog := mustLoadProgram(t, ebpf.Kprobe, ebpf.AttachTraceKprobeMulti, "")
km, err := KprobeMulti(prog, KprobeMultiOptions{
Symbols: kprobeMultiSyms,
Cookies: []uint64{0, 1},
})
if err != nil {
t.Fatal(err)
}
_ = km.Close()
}
func TestKprobeMultiProgramCall(t *testing.T) {
testutils.SkipIfNotSupported(t, haveBPFLinkKprobeMulti())
m, p := newUpdaterMapProg(t, ebpf.Kprobe, ebpf.AttachTraceKprobeMulti)
// For simplicity, just assert the increment happens with any symbol in the array.
opts := KprobeMultiOptions{
Symbols: []string{"__do_sys_getpid", "__do_sys_gettid"},
}
km, err := KprobeMulti(p, opts)
if err != nil {
t.Fatal(err)
}
// Trigger ebpf program call.
unix.Getpid()
unix.Gettid()
// Assert that the value got incremented to at least 2, while allowing
// for bigger values, because we could race with other getpid/gettid
// callers.
assertMapValueGE(t, m, 0, 2)
// Close the link.
if err := km.Close(); err != nil {
t.Fatal(err)
}
// Reset map value to 0 at index 0.
if err := m.Update(uint32(0), uint32(0), ebpf.UpdateExist); err != nil {
t.Fatal(err)
}
// Retrigger the ebpf program call.
unix.Getpid()
unix.Gettid()
// Assert that this time the value has not been updated.
assertMapValue(t, m, 0, 0)
}
func TestHaveBPFLinkKprobeMulti(t *testing.T) {
testutils.CheckFeatureTest(t, haveBPFLinkKprobeMulti)
}
func TestKprobeSession(t *testing.T) {
testutils.SkipIfNotSupported(t, haveBPFLinkKprobeMulti())
prog := mustLoadProgram(t, ebpf.Kprobe, ebpf.AttachTraceKprobeSession, "")
km, err := KprobeMulti(prog, KprobeMultiOptions{Symbols: kprobeMultiSyms, Session: true})
testutils.SkipIfNotSupported(t, err)
qt.Assert(t, qt.IsNil(err))
defer km.Close()
testLink(t, km, prog)
}
func TestHaveBPFLinkKprobeSession(t *testing.T) {
testutils.CheckFeatureTest(t, haveBPFLinkKprobeSession)
}
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