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feac077c1d
BUG=chrome-os-partner:9707 TEST=manual make make runtests You can also test it by clearing the TPM, then manually looking at the TPM regions. In dev-mode, clear the regions and you'll see something like this: localhost ~ # tpmc read 1007 a 1 0 0 0 0 0 0 0 0 0 localhost ~ # tpmc read 1008 d 1 4c 57 52 47 0 0 0 0 0 0 0 0 localhost ~ # Go back to normal mode and reboot, and you'll see something like this: localhost ~ # tpmc read 1007 a 2 0 1 0 1 0 0 0 0 4f localhost ~ # tpmc read 1008 d 2 4c 57 52 47 1 0 1 0 0 0 0 55 localhost ~ # The important things are that the first number is now 2, instead of 1, and the last number is not zero (it's a checksum, so it'll vary depending on the other numbers, which will themselves vary according to the firmware and kernel versions). Change-Id: Ia4040311c2a4b2819792549b883377c8b6b89d48 Signed-off-by: Bill Richardson <wfrichar@chromium.org> Reviewed-on: https://gerrit.chromium.org/gerrit/22856 Reviewed-by: Randall Spangler <rspangler@chromium.org>
121 lines
4.8 KiB
C
121 lines
4.8 KiB
C
/* Copyright (c) 2011 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Functions for querying, manipulating and locking rollback indices
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* stored in the TPM NVRAM.
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*/
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#ifndef VBOOT_REFERENCE_ROLLBACK_INDEX_H_
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#define VBOOT_REFERENCE_ROLLBACK_INDEX_H_
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#include "sysincludes.h"
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#include "tss_constants.h"
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/* TPM NVRAM location indices. */
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#define FIRMWARE_NV_INDEX 0x1007
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#define KERNEL_NV_INDEX 0x1008
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/* Structure definitions for TPM spaces */
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__pragma(pack(push, 1)) /* Support packing for MSVC. */
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/* Kernel space - KERNEL_NV_INDEX, locked with physical presence. */
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#define ROLLBACK_SPACE_KERNEL_VERSION 2
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#define ROLLBACK_SPACE_KERNEL_UID 0x4752574C /* 'GRWL' */
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typedef struct RollbackSpaceKernel {
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uint8_t struct_version; /* Struct version, for backwards
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* compatibility */
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uint32_t uid; /* Unique ID to detect space redefinition */
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uint32_t kernel_versions; /* Kernel versions */
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uint8_t reserved[3]; /* Reserved for future expansion */
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uint8_t crc8; /* Checksum (v2 and later only) */
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} __attribute__((packed)) RollbackSpaceKernel;
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/* Flags for firmware space */
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/* Last boot was developer mode. TPM ownership is cleared when
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* transitioning to/from developer mode. */
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#define FLAG_LAST_BOOT_DEVELOPER 0x01
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/* There have been one or more boots which left PP unlocked, so the
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* contents of the kernel space are untrusted and must be restored
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* from the backup copy. */
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#define FLAG_KERNEL_SPACE_USE_BACKUP 0x02
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#define ROLLBACK_SPACE_FIRMWARE_VERSION 2
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/* Firmware space - FIRMWARE_NV_INDEX, locked with global lock. */
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typedef struct RollbackSpaceFirmware {
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uint8_t struct_version; /* Struct version, for backwards compatibility */
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uint8_t flags; /* Flags (see FLAG_* above) */
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uint32_t fw_versions; /* Firmware versions */
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uint8_t reserved[3]; /* Reserved for future expansion */
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uint8_t crc8; /* Checksum (v2 and later only) */
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} __attribute__((packed)) RollbackSpaceFirmware;
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__pragma(pack(pop)) /* Support packing for MSVC. */
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/* All functions return TPM_SUCCESS (zero) if successful, non-zero if error */
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/* These functions are called from VbInit(). They cannot use global
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* variables. */
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uint32_t RollbackS3Resume(void);
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/* These functions are callable from VbSelectFirmware(). They cannot use
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* global variables. */
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/* Setup must be called. Pass recovery_mode=nonzero if in recovery
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* mode. Pass developer_mode=nonzero if in developer
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* mode. */
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uint32_t RollbackFirmwareSetup(int recovery_mode, int developer_mode,
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uint32_t* version);
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/* Write may be called if the versions change */
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uint32_t RollbackFirmwareWrite(uint32_t version);
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/* Lock must be called */
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uint32_t RollbackFirmwareLock(void);
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/* These functions are callable from VbSelectAndLoadKernel(). They
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* may use global variables. */
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/* Read and write may be called to read and write the kernel version. */
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uint32_t RollbackKernelRead(uint32_t* version);
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uint32_t RollbackKernelWrite(uint32_t version);
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/* Lock must be called. Internally, it's ignored in recovery mode. */
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uint32_t RollbackKernelLock(void);
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/****************************************************************************/
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/* The following functions are internal apis, listed here for use by
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* unit tests only. */
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/* Issue a TPM_Clear and reenable/reactivate the TPM. */
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uint32_t TPMClearAndReenable(void);
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/* Like TlclWrite(), but checks for write errors due to hitting the 64-write
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* limit and clears the TPM when that happens. This can only happen when the
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* TPM is unowned, so it is OK to clear it (and we really have no choice).
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* This is not expected to happen frequently, but it could happen. */
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uint32_t SafeWrite(uint32_t index, const void* data, uint32_t length);
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/* Similarly to SafeWrite(), this ensures we don't fail a DefineSpace because
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* we hit the TPM write limit. This is even less likely to happen than with
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* writes because we only define spaces once at initialization, but we'd rather
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* be paranoid about this. */
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uint32_t SafeDefineSpace(uint32_t index, uint32_t perm, uint32_t size);
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/* Performs one-time initializations. Creates the NVRAM spaces, and sets their
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* initial values as needed. Sets the nvLocked bit and ensures the physical
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* presence command is enabled and locked.
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*/
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uint32_t OneTimeInitializeTPM(RollbackSpaceFirmware* rsf,
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RollbackSpaceKernel* rsk);
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/* SetupTPM starts the TPM and establishes the root of trust for the
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* anti-rollback mechanism. */
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uint32_t SetupTPM(int recovery_mode, int developer_mode,
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RollbackSpaceFirmware* rsf);
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#endif /* VBOOT_REFERENCE_ROLLBACK_INDEX_H_ */
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