1 /* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
2  * Use of this source code is governed by a BSD-style license that can be
3  * found in the LICENSE file.
4  */
5 
6 /* Test of recovery when we hit the NVRAM write limit for an unowned TPM.
7  */
8 
9 #include <stdio.h>
10 #include <stdint.h>
11 #include <stdlib.h>
12 
13 #include "host_common.h"
14 #include "tlcl.h"
15 #include "tlcl_tests.h"
16 
17 #define TPM_MAX_NV_WRITES_NOOWNER 64
18 
main(int argc,char ** argv)19 int main(int argc, char** argv) {
20   int i;
21 
22   uint32_t result;
23 
24   TlclLibInit();
25 
26   TPM_CHECK(TlclStartupIfNeeded());
27   TPM_CHECK(TlclSelfTestFull());
28   TPM_CHECK(TlclAssertPhysicalPresence());
29   TPM_CHECK(TlclForceClear());
30   TPM_CHECK(TlclSetEnable());
31   TPM_CHECK(TlclSetDeactivated(0));
32 
33   for (i = 0; i < TPM_MAX_NV_WRITES_NOOWNER + 2; i++) {
34     printf("writing %d\n", i);
35     if ((result = TlclWrite(INDEX0, (uint8_t*)&i, sizeof(i))) != TPM_SUCCESS) {
36       switch (result) {
37       case TPM_E_MAXNVWRITES:
38         VbAssert(i >= TPM_MAX_NV_WRITES_NOOWNER);
39         break;
40       default:
41         VbExError("unexpected error code %d (0x%x)\n", result, result);
42       }
43     }
44   }
45 
46   /* Reset write count */
47   TPM_CHECK(TlclForceClear());
48   TPM_CHECK(TlclSetEnable());
49   TPM_CHECK(TlclSetDeactivated(0));
50 
51   /* Try writing again. */
52   TPM_CHECK(TlclWrite(INDEX0, (uint8_t*)&i, sizeof(i)));
53 
54   printf("TEST SUCCEEDED\n");
55   exit(0);
56 }
57