From 70ebecdf6ad9b55fc9dc46c7ebbce285a5a51a9d Mon Sep 17 00:00:00 2001
From: Stefan Berger <stefanb@linux.vnet.ibm.com>
Date: Thu, 22 Jul 2021 11:02:09 -0400
Subject: [PATCH] tests: fuzz: Register callbacks to avoid creating NVChip file

Register callbacks so that we don't create the NVChip file.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
 tests/fuzz.cc | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/tests/fuzz.cc b/tests/fuzz.cc
index 5cff22bf..9227efac 100644
--- a/tests/fuzz.cc
+++ b/tests/fuzz.cc
@@ -16,6 +16,43 @@ static void die(const char *msg)
     assert(false);
 }
 
+static TPM_RESULT mytpm_io_init(void)
+{
+    return TPM_SUCCESS;
+}
+
+static TPM_RESULT mytpm_io_getlocality(TPM_MODIFIER_INDICATOR *locModif,
+                                       uint32_t tpm_number)
+{
+    *locModif = 0;
+
+    return TPM_SUCCESS;
+}
+
+static TPM_RESULT mytpm_io_getphysicalpresence(TPM_BOOL *phyPres,
+                                               uint32_t tpm_number)
+{
+    *phyPres = FALSE;
+
+    return TPM_SUCCESS;
+}
+
+static TPM_RESULT mytpm_nvram_loaddata(unsigned char **data,
+                                       uint32_t *length,
+                                       uint32_t tpm_number,
+                                       const char *name)
+{
+    return TPM_RETRY;
+}
+
+static TPM_RESULT mytpm_nvram_storedata(const unsigned char *data,
+                                        uint32_t length,
+                                        uint32_t tpm_number,
+                                        const char *name)
+{
+    return TPM_SUCCESS;
+}
+
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
 {
     unsigned char *rbuffer = NULL;
@@ -25,6 +62,19 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size)
     unsigned char startup[] = {
         0x80, 0x01, 0x00, 0x00, 0x00, 0x0c, 0x00, 0x00, 0x01, 0x44, 0x00, 0x00
     };
+    struct libtpms_callbacks cbs = {
+        .sizeOfStruct               = sizeof(struct libtpms_callbacks),
+        .tpm_nvram_init             = NULL,
+        .tpm_nvram_loaddata         = mytpm_nvram_loaddata,
+        .tpm_nvram_storedata        = mytpm_nvram_storedata,
+        .tpm_nvram_deletename       = NULL,
+        .tpm_io_init                = mytpm_io_init,
+        .tpm_io_getlocality         = mytpm_io_getlocality,
+        .tpm_io_getphysicalpresence = mytpm_io_getphysicalpresence,
+    };
+    res = TPMLIB_RegisterCallbacks(&cbs);
+    if (res != TPM_SUCCESS)
+        die("Could not register callbacks\n");
 
     res = TPMLIB_ChooseTPMVersion(TPMLIB_TPM_VERSION_2);
     if (res != TPM_SUCCESS)