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Add physical presence initialization and locking to one-time initializations.

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Change-Id: If2b6041fe93bc97885e45bbb0cf7e1b81cb06c18

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/3229011
This commit is contained in:
Luigi Semenzato
2010-08-31 13:20:53 -07:00
parent 60563ee0af
commit 377557fcb2
6 changed files with 64 additions and 22 deletions
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51
firmware/lib/rollback_index.c
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@@ -98,20 +98,25 @@ static uint32_t WriteSpaceKernel(const RollbackSpaceKernel* rsk) {
return SafeWrite(KERNEL_NV_INDEX, rsk, sizeof(RollbackSpaceKernel));
}
/* Creates the NVRAM spaces, and sets their initial values as needed. */
static uint32_t InitializeSpaces(RollbackSpaceFirmware* rsf,
RollbackSpaceKernel* rsk) {
/* Performs one-time initializations. Creates the NVRAM spaces, and sets their
* initial values as needed. Sets the nvLocked bit and ensures the physical
* presence command is enabled and locked.
*/
static uint32_t OneTimeInitializeTPM(RollbackSpaceFirmware* rsf,
RollbackSpaceKernel* rsk) {
static const RollbackSpaceFirmware rsf_init = {
ROLLBACK_SPACE_FIRMWARE_VERSION, 0, 0, 0};
static const RollbackSpaceKernel rsk_init = {
ROLLBACK_SPACE_KERNEL_VERSION, ROLLBACK_SPACE_KERNEL_UID, 0, 0};
uint8_t nvlocked = 0;
VBDEBUG(("TPM: Initializing spaces\n"));
VBDEBUG(("TPM: One-time initialization\n"));
RETURN_ON_FAILURE(TlclFinalizePhysicalPresence());
/* The TPM will not enforce the NV authorization restrictions until the
* execution of a TPM_NV_DefineSpace with the handle of TPM_NV_INDEX_LOCK.
* Create that space if it doesn't already exist. */
* Here we create that space if it doesn't already exist. */
RETURN_ON_FAILURE(TlclGetFlags(NULL, NULL, &nvlocked));
VBDEBUG(("TPM: nvlocked=%d\n", nvlocked));
if (!nvlocked) {
@@ -119,11 +124,11 @@ static uint32_t InitializeSpaces(RollbackSpaceFirmware* rsf,
RETURN_ON_FAILURE(TlclSetNvLocked());
}
/* Initialize the firmware and kernel spaces */
/* Initializes the firmware and kernel spaces */
Memcpy(rsf, &rsf_init, sizeof(RollbackSpaceFirmware));
Memcpy(rsk, &rsk_init, sizeof(RollbackSpaceKernel));
/* Define and set firmware and kernel spaces */
/* Defines and sets firmware and kernel spaces */
RETURN_ON_FAILURE(SafeDefineSpace(FIRMWARE_NV_INDEX,
TPM_NV_PER_GLOBALLOCK | TPM_NV_PER_PPWRITE,
sizeof(RollbackSpaceFirmware)));
@@ -177,9 +182,17 @@ uint32_t SetupTPM(int recovery_mode, int developer_mode,
#else
RETURN_ON_FAILURE(TlclSelfTestFull());
#endif
RETURN_ON_FAILURE(TlclAssertPhysicalPresence());
result = TlclAssertPhysicalPresence();
if (result != 0) {
/* It is possible that the TPM was delivered with the physical presence
* command disabled. This tries enabling it, then tries asserting PP
* again.
*/
RETURN_ON_FAILURE(TlclPhysicalPresenceCMDEnable());
RETURN_ON_FAILURE(TlclAssertPhysicalPresence());
}
/* Check that the TPM is enabled and activated. */
/* Checks that the TPM is enabled and activated. */
RETURN_ON_FAILURE(TlclGetFlags(&disable, &deactivated, NULL));
if (disable || deactivated) {
VBDEBUG(("TPM: disabled (%d) or deactivated (%d). Fixing...\n",
@@ -190,15 +203,15 @@ uint32_t SetupTPM(int recovery_mode, int developer_mode,
return TPM_E_MUST_REBOOT;
}
/* Read the firmware space. */
/* Reads the firmware space. */
result = ReadSpaceFirmware(rsf);
if (TPM_E_BADINDEX == result) {
RollbackSpaceKernel rsk;
/* This is the first time we've run, and the TPM has not been
* initialized. Initialize it. */
* initialized. This initializes it. */
VBDEBUG(("TPM: Not initialized yet.\n"));
RETURN_ON_FAILURE(InitializeSpaces(rsf, &rsk));
RETURN_ON_FAILURE(OneTimeInitializeTPM(rsf, &rsk));
} else if (TPM_SUCCESS != result) {
VBDEBUG(("TPM: Firmware space in a bad state; giving up.\n"));
return TPM_E_CORRUPTED_STATE;
@@ -206,14 +219,14 @@ uint32_t SetupTPM(int recovery_mode, int developer_mode,
VBDEBUG(("TPM: Firmware space sv%d f%x v%x\n",
rsf->struct_version, rsf->flags, rsf->fw_versions));
/* Clear ownership if developer flag has toggled */
/* Clears ownership if developer flag has toggled */
if ((developer_mode ? FLAG_LAST_BOOT_DEVELOPER : 0) !=
(rsf->flags & FLAG_LAST_BOOT_DEVELOPER)) {
VBDEBUG(("TPM: Developer flag changed; clearing owner.\n"));
RETURN_ON_FAILURE(TPMClearAndReenable());
}
/* Update flags */
/* Updates flags */
if (developer_mode)
new_flags |= FLAG_LAST_BOOT_DEVELOPER;
if (recovery_mode)
@@ -225,7 +238,7 @@ uint32_t SetupTPM(int recovery_mode, int developer_mode,
rsf_dirty = 1;
}
/* If firmware space is dirty, flush it back to the TPM */
/* If firmware space is dirty, this flushes it back to the TPM */
if (rsf_dirty) {
VBDEBUG(("TPM: Updating firmware space.\n"));
RETURN_ON_FAILURE(WriteSpaceFirmware(rsf));
@@ -245,8 +258,8 @@ __pragma(warning (disable: 4100))
uint32_t RollbackFirmwareSetup(int developer_mode, uint32_t* version) {
#ifndef CHROMEOS_ENVIRONMENT
/* Initialize the TPM, but ignore return codes. In ChromeOS
* environment, don't even talk to the TPM. */
/* Initializes the TPM, but ignores return codes. In ChromeOS
* environment, doesn't even talk to the TPM. */
TlclLibInit();
TlclStartup();
TlclSelfTestFull();
@@ -266,8 +279,8 @@ uint32_t RollbackFirmwareLock(void) {
uint32_t RollbackKernelRecovery(int developer_mode) {
#ifndef CHROMEOS_ENVIRONMENT
/* Initialize the TPM, but ignore return codes. In ChromeOS
* environment, don't even talk to the TPM. */
/* Initializes the TPM, but ignore return codes. In ChromeOS
* environment, doesn't even talk to the TPM. */
TlclLibInit();
TlclStartup();
TlclSelfTestFull();