1 files changed, 0 insertions, 436 deletions
diff --git a/src/vendorcode/google/chromeos/vboot2/antirollback.c b/src/vendorcode/google/chromeos/vboot2/antirollback.c
deleted file mode 100644
index a51e5d6d55..0000000000
--- a/src/vendorcode/google/chromeos/vboot2/antirollback.c
+++ /dev/null
@@ -1,436 +0,0 @@
-/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- *
- * Functions for querying, manipulating and locking rollback indices
- * stored in the TPM NVRAM.
- */
-
-#include <antirollback.h>
-#include <stdlib.h>
-#include <string.h>
-#include <tpm_lite/tlcl.h>
-#include <vb2_api.h>
-#include <console/console.h>
-
-#ifndef offsetof
-#define offsetof(A,B) __builtin_offsetof(A,B)
-#endif
-
-#ifdef FOR_TEST
-#include <stdio.h>
-#define VBDEBUG(format, args...) printf(format, ## args)
-#else
-#include <console/console.h>
-#define VBDEBUG(format, args...) \
-	printk(BIOS_INFO, "%s():%d: " format,  __func__, __LINE__, ## args)
-#endif
-
-#define RETURN_ON_FAILURE(tpm_cmd) do {				\
-		uint32_t result_;					\
-		if ((result_ = (tpm_cmd)) != TPM_SUCCESS) {		\
-			VBDEBUG("Antirollback: %08x returned by " #tpm_cmd \
-				 "\n", (int)result_);			\
-			return result_;					\
-		}							\
-	} while (0)
-
-
-static uint32_t safe_write(uint32_t index, const void *data, uint32_t length);
-
-uint32_t tpm_extend_pcr(struct vb2_context *ctx, int pcr,
-			enum vb2_pcr_digest which_digest)
-{
-	uint8_t buffer[VB2_PCR_DIGEST_RECOMMENDED_SIZE];
-	uint32_t size = sizeof(buffer);
-	int rv;
-
-	rv = vb2api_get_pcr_digest(ctx, which_digest, buffer, &size);
-	if (rv != VB2_SUCCESS)
-		return rv;
-	if (size < TPM_PCR_DIGEST)
-		return VB2_ERROR_UNKNOWN;
-
-	return tlcl_extend(pcr, buffer, NULL);
-}
-
-static uint32_t read_space_firmware(struct vb2_context *ctx)
-{
-	int attempts = 3;
-
-	while (attempts--) {
-		RETURN_ON_FAILURE(tlcl_read(FIRMWARE_NV_INDEX, ctx->secdata,
-		                            VB2_SECDATA_SIZE));
-
-		if (vb2api_secdata_check(ctx) == VB2_SUCCESS)
-			return TPM_SUCCESS;
-
-		VBDEBUG("TPM: %s() - bad CRC\n", __func__);
-	}
-
-	VBDEBUG("TPM: %s() - too many bad CRCs, giving up\n", __func__);
-	return TPM_E_CORRUPTED_STATE;
-}
-
-static uint32_t write_secdata(uint32_t index,
-			      const uint8_t *secdata,
-			      uint32_t len)
-{
-	uint8_t sd[32];
-	uint32_t rv;
-	int attempts = 3;
-
-	if (len > sizeof(sd)) {
-		VBDEBUG("TPM: %s() - data is too large\n", __func__);
-		return TPM_E_WRITE_FAILURE;
-	}
-
-	while (attempts--) {
-		rv = safe_write(index, secdata, len);
-		/* Can't write, not gonna try again */
-		if (rv != TPM_SUCCESS)
-			return rv;
-
-		/* Read it back to be sure it got the right values. */
-		rv = tlcl_read(index, sd, len);
-		if (rv == TPM_SUCCESS && memcmp(secdata, sd, len) == 0)
-			return rv;
-
-		VBDEBUG("TPM: %s() failed. trying again\n", __func__);
-		/* Try writing it again. Maybe it was garbled on the way out. */
-	}
-
-	VBDEBUG("TPM: %s() - too many failures, giving up\n", __func__);
-
-	return TPM_E_CORRUPTED_STATE;
-}
-
-/*
- * This is derived from rollback_index.h of vboot_reference. see struct
- * RollbackSpaceKernel for details.
- */
-static const uint8_t secdata_kernel[] = {
-	0x02,
-	0x4C, 0x57, 0x52, 0x47,
-	0x00, 0x00, 0x00, 0x00,
-	0x00, 0x00, 0x00,
-	0xE8,
-};
-
-#if IS_ENABLED(CONFIG_TPM2)
-
-/* Nothing special in the TPM2 path yet. */
-static uint32_t safe_write(uint32_t index, const void *data, uint32_t length)
-{
-	return tlcl_write(index, data, length);
-}
-
-static uint32_t set_firmware_space(const void *firmware_blob)
-{
-	RETURN_ON_FAILURE(tlcl_define_space(FIRMWARE_NV_INDEX,
-					    VB2_SECDATA_SIZE));
-	RETURN_ON_FAILURE(safe_write(FIRMWARE_NV_INDEX, firmware_blob,
-				     VB2_SECDATA_SIZE));
-	return TPM_SUCCESS;
-}
-
-static uint32_t set_kernel_space(const void *kernel_blob)
-{
-	RETURN_ON_FAILURE(tlcl_define_space(KERNEL_NV_INDEX,
-					    sizeof(secdata_kernel)));
-	RETURN_ON_FAILURE(safe_write(KERNEL_NV_INDEX, kernel_blob,
-				     sizeof(secdata_kernel)));
-	return TPM_SUCCESS;
-}
-
-static uint32_t _factory_initialize_tpm(struct vb2_context *ctx)
-{
-	RETURN_ON_FAILURE(tlcl_force_clear());
-	RETURN_ON_FAILURE(set_firmware_space(ctx->secdata));
-	RETURN_ON_FAILURE(set_kernel_space(secdata_kernel));
-	return TPM_SUCCESS;
-}
-
-uint32_t tpm_clear_and_reenable(void)
-{
-	VBDEBUG("TPM: Clear and re-enable\n");
-	return TPM_SUCCESS;
-}
-
-uint32_t antirollback_lock_space_firmware(void)
-{
-	return tlcl_lock_nv_write(FIRMWARE_NV_INDEX);
-}
-
-#else
-
-uint32_t tpm_clear_and_reenable(void)
-{
-	VBDEBUG("TPM: Clear and re-enable\n");
-	RETURN_ON_FAILURE(tlcl_force_clear());
-	RETURN_ON_FAILURE(tlcl_set_enable());
-	RETURN_ON_FAILURE(tlcl_set_deactivated(0));
-
-	return TPM_SUCCESS;
-}
-
-/**
- * Like tlcl_write(), but checks for write errors due to hitting the 64-write
- * limit and clears the TPM when that happens.  This can only happen when the
- * TPM is unowned, so it is OK to clear it (and we really have no choice).
- * This is not expected to happen frequently, but it could happen.
- */
-
-static uint32_t safe_write(uint32_t index, const void *data, uint32_t length)
-{
-	uint32_t result = tlcl_write(index, data, length);
-	if (result == TPM_E_MAXNVWRITES) {
-		RETURN_ON_FAILURE(tpm_clear_and_reenable());
-		return tlcl_write(index, data, length);
-	} else {
-		return result;
-	}
-}
-
-/**
- * Similarly to safe_write(), this ensures we don't fail a DefineSpace because
- * we hit the TPM write limit. This is even less likely to happen than with
- * writes because we only define spaces once at initialization, but we'd
- * rather be paranoid about this.
- */
-static uint32_t safe_define_space(uint32_t index, uint32_t perm, uint32_t size)
-{
-	uint32_t result = tlcl_define_space(index, perm, size);
-	if (result == TPM_E_MAXNVWRITES) {
-		RETURN_ON_FAILURE(tpm_clear_and_reenable());
-		return tlcl_define_space(index, perm, size);
-	} else {
-		return result;
-	}
-}
-
-static uint32_t _factory_initialize_tpm(struct vb2_context *ctx)
-{
-	TPM_PERMANENT_FLAGS pflags;
-	uint32_t result;
-
-	result = tlcl_get_permanent_flags(&pflags);
-	if (result != TPM_SUCCESS)
-		return result;
-
-	/*
-	 * TPM may come from the factory without physical presence finalized.
-	 * Fix if necessary.
-	 */
-	VBDEBUG("TPM: physicalPresenceLifetimeLock=%d\n",
-		 pflags.physicalPresenceLifetimeLock);
-	if (!pflags.physicalPresenceLifetimeLock) {
-		VBDEBUG("TPM: Finalizing physical presence\n");
-		RETURN_ON_FAILURE(tlcl_finalize_physical_presence());
-	}
-
-	/*
-	 * 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.  Here we create that space if it doesn't already
-	 * exist. */
-	VBDEBUG("TPM: nvLocked=%d\n", pflags.nvLocked);
-	if (!pflags.nvLocked) {
-		VBDEBUG("TPM: Enabling NV locking\n");
-		RETURN_ON_FAILURE(tlcl_set_nv_locked());
-	}
-
-	/* Clear TPM owner, in case the TPM is already owned for some reason. */
-	VBDEBUG("TPM: Clearing owner\n");
-	RETURN_ON_FAILURE(tpm_clear_and_reenable());
-
-	/* Define the backup space. No need to initialize it, though. */
-	RETURN_ON_FAILURE(safe_define_space(BACKUP_NV_INDEX,
-					    TPM_NV_PER_PPWRITE,
-					    VB2_NVDATA_SIZE));
-
-	/* Define and initialize the kernel space */
-	RETURN_ON_FAILURE(safe_define_space(KERNEL_NV_INDEX,
-					    TPM_NV_PER_PPWRITE,
-					    sizeof(secdata_kernel)));
-	RETURN_ON_FAILURE(write_secdata(KERNEL_NV_INDEX,
-					secdata_kernel,
-					sizeof(secdata_kernel)));
-
-	/* Defines and sets vb2 secdata space */
-	vb2api_secdata_create(ctx);
-	RETURN_ON_FAILURE(safe_define_space(FIRMWARE_NV_INDEX,
-	                                    TPM_NV_PER_GLOBALLOCK |
-	                                    TPM_NV_PER_PPWRITE,
-	                                    VB2_SECDATA_SIZE));
-	RETURN_ON_FAILURE(write_secdata(FIRMWARE_NV_INDEX,
-					ctx->secdata,
-					VB2_SECDATA_SIZE));
-	return TPM_SUCCESS;
-}
-
-uint32_t antirollback_lock_space_firmware(void)
-{
-	return tlcl_set_global_lock();
-}
-#endif
-
-uint32_t factory_initialize_tpm(struct vb2_context *ctx)
-{
-	uint32_t result;
-
-	/* Defines and sets vb2 secdata space */
-	vb2api_secdata_create(ctx);
-
-	VBDEBUG("TPM: factory initialization\n");
-
-	/*
-	 * Do a full test.  This only happens the first time the device is
-	 * turned on in the factory, so performance is not an issue.  This is
-	 * almost certainly not necessary, but it gives us more confidence
-	 * about some code paths below that are difficult to
-	 * test---specifically the ones that set lifetime flags, and are only
-	 * executed once per physical TPM.
-	 */
-	result = tlcl_self_test_full();
-	if (result != TPM_SUCCESS)
-		return result;
-
-	result = _factory_initialize_tpm(ctx);
-	if (result != TPM_SUCCESS)
-		return result;
-
-	VBDEBUG("TPM: factory initialization successful\n");
-
-	return TPM_SUCCESS;
-}
-
-/*
- * SetupTPM starts the TPM and establishes the root of trust for the
- * anti-rollback mechanism.  SetupTPM can fail for three reasons.  1 A bug. 2 a
- * TPM hardware failure. 3 An unexpected TPM state due to some attack.  In
- * general we cannot easily distinguish the kind of failure, so our strategy is
- * to reboot in recovery mode in all cases.  The recovery mode calls SetupTPM
- * again, which executes (almost) the same sequence of operations.  There is a
- * good chance that, if recovery mode was entered because of a TPM failure, the
- * failure will repeat itself.  (In general this is impossible to guarantee
- * because we have no way of creating the exact TPM initial state at the
- * previous boot.)  In recovery mode, we ignore the failure and continue, thus
- * giving the recovery kernel a chance to fix things (that's why we don't set
- * bGlobalLock).  The choice is between a knowingly insecure device and a
- * bricked device.
- *
- * As a side note, observe that we go through considerable hoops to avoid using
- * the STCLEAR permissions for the index spaces.  We do this to avoid writing
- * to the TPM flashram at every reboot or wake-up, because of concerns about
- * the durability of the NVRAM.
- */
-uint32_t setup_tpm(struct vb2_context *ctx)
-{
-	uint8_t disable;
-	uint8_t deactivated;
-	uint32_t result;
-
-	RETURN_ON_FAILURE(tlcl_lib_init());
-
-	/* Handle special init for S3 resume path */
-	if (ctx->flags & VB2_CONTEXT_S3_RESUME) {
-		result = tlcl_resume();
-		if (result == TPM_E_INVALID_POSTINIT)
-			printk(BIOS_DEBUG, "TPM: Already initialized.\n");
-		return TPM_SUCCESS;
-	}
-
-#ifdef TEGRA_SOFT_REBOOT_WORKAROUND
-	result = tlcl_startup();
-	if (result == TPM_E_INVALID_POSTINIT) {
-		/*
-		 * Some prototype hardware doesn't reset the TPM on a CPU
-		 * reset.  We do a hard reset to get around this.
-		 */
-		VBDEBUG("TPM: soft reset detected\n", result);
-		ctx->flags |= VB2_CONTEXT_SECDATA_WANTS_REBOOT;
-		return TPM_E_MUST_REBOOT;
-	} else if (result != TPM_SUCCESS) {
-		VBDEBUG("TPM: tlcl_startup returned %08x\n", result);
-		return result;
-	}
-#else
-	RETURN_ON_FAILURE(tlcl_startup());
-#endif
-
-	/*
-	 * Some TPMs start the self test automatically at power on. In that case
-	 * we don't need to call ContinueSelfTest. On some (other) TPMs,
-	 * continue_self_test may block. In that case, we definitely don't want
-	 * to call it here. For TPMs in the intersection of these two sets, we
-	 * are screwed. (In other words: TPMs that require manually starting the
-	 * self-test AND block will have poor performance until we split
-	 * tlcl_send_receive() into send() and receive(), and have a state
-	 * machine to control setup.)
-	 *
-	 * This comment is likely to become obsolete in the near future, so
-	 * don't trust it. It may have not been updated.
-	 */
-#ifdef TPM_MANUAL_SELFTEST
-#ifdef TPM_BLOCKING_CONTINUESELFTEST
-#warning "lousy TPM!"
-#endif
-	RETURN_ON_FAILURE(tlcl_continue_self_test());
-#endif
-	result = tlcl_assert_physical_presence();
-	if (result != TPM_SUCCESS) {
-		/*
-		 * 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(tlcl_physical_presence_cmd_enable());
-		RETURN_ON_FAILURE(tlcl_assert_physical_presence());
-	}
-
-	/* Check that the TPM is enabled and activated. */
-	RETURN_ON_FAILURE(tlcl_get_flags(&disable, &deactivated, NULL));
-	if (disable || deactivated) {
-		VBDEBUG("TPM: disabled (%d) or deactivated (%d). Fixing...\n",
-			disable, deactivated);
-		RETURN_ON_FAILURE(tlcl_set_enable());
-		RETURN_ON_FAILURE(tlcl_set_deactivated(0));
-		VBDEBUG("TPM: Must reboot to re-enable\n");
-		ctx->flags |= VB2_CONTEXT_SECDATA_WANTS_REBOOT;
-		return TPM_E_MUST_REBOOT;
-	}
-
-	VBDEBUG("TPM: SetupTPM() succeeded\n");
-	return TPM_SUCCESS;
-}
-
-uint32_t antirollback_read_space_firmware(struct vb2_context *ctx)
-{
-	uint32_t rv;
-
-	rv = setup_tpm(ctx);
-	if (rv)
-		return rv;
-
-	/* Read the firmware space. */
-	rv = read_space_firmware(ctx);
-	if (rv == TPM_E_BADINDEX) {
-		/*
-		 * This seems the first time we've run. Initialize the TPM.
-		 */
-		VBDEBUG("TPM: Not initialized yet.\n");
-		RETURN_ON_FAILURE(factory_initialize_tpm(ctx));
-	} else if (rv != TPM_SUCCESS) {
-		VBDEBUG("TPM: Firmware space in a bad state; giving up.\n");
-		//RETURN_ON_FAILURE(factory_initialize_tpm(ctx));
-		return TPM_E_CORRUPTED_STATE;
-	}
-
-	return TPM_SUCCESS;
-}
-
-uint32_t antirollback_write_space_firmware(struct vb2_context *ctx)
-{
-	return write_secdata(FIRMWARE_NV_INDEX, ctx->secdata, VB2_SECDATA_SIZE);
-}