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Parse TCG_PCR_EVENT2 structures with an eventSize of 0

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This commit is contained in:
José Martínez 2023-05-15 14:33:57 +00:00 committed by Eric Chiang
parent 270ecbab1f
commit 1f9c436d57
2 changed files with 37 additions and 3 deletions
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3
attest/eventlog.go
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@ -751,9 +751,6 @@ func parseRawEvent2(r *bytes.Buffer, specID *specIDEvent) (event rawEvent, err e
if err = binary.Read(r, binary.LittleEndian, &eventSize); err != nil {
return event, err
}
if eventSize == 0 {
return event, errors.New("event data size is 0")
}
if eventSize > uint32(r.Len()) {
return event, &eventSizeErr{eventSize, r.Len()}
}

37
attest/eventlog_test.go
View File

@ -174,6 +174,43 @@ func TestParseEventLogEventSizeZero(t *testing.T) {
}
}
func TestParseEventLog2EventSizeZero(t *testing.T) {
data := []byte{
// PCR index
0x0, 0x0, 0x0, 0x0,
// type
0x7, 0x0, 0x0, 0x0,
// number of digests
0x1, 0x0, 0x0, 0x0,
// algorithm
0xb, 0x0,
// Digest
0xc8, 0xe3, 0x88, 0xb4, 0x79, 0x12, 0x86, 0x0c,
0x66, 0xa1, 0x5d, 0xad, 0xc4, 0x34, 0xf5, 0xdf,
0x73, 0x6c, 0x3a, 0xb4, 0xbe, 0x52, 0x07, 0x08,
0xdf, 0xac, 0x48, 0x2d, 0x71, 0xce, 0xa0, 0x73,
// Event size (0 B)
0x0, 0x0, 0x0, 0x0,
// no "event data"
}
specID := &specIDEvent{
algs: []specAlgSize{
{ID: uint16(tpm2.AlgSHA256), Size: 32},
},
}
if _, err := parseRawEvent2(bytes.NewBuffer(data), specID); err != nil {
t.Fatalf("parsing event log: %v", err)
}
}
func TestParseShortNoAction(t *testing.T) {
// https://trustedcomputinggroup.org/wp-content/uploads/TCG_PCClientSpecPlat_TPM_2p0_1p04_pub.pdf#page=110
// says: "For EV_NO_ACTION events other than the EFI Specification ID event