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Add checksum to TPM RollbackSpace regions for FW and kernel.

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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>
This commit is contained in:
Bill Richardson
2012-05-16 10:04:38 -07:00
committed by Gerrit
parent f63ab219c5
commit feac077c1d
9 changed files with 417 additions and 47 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
firmware/lib/include/rollback_index.h
View File

@@ -21,14 +21,15 @@
__pragma(pack(push, 1)) /* Support packing for MSVC. */
/* Kernel space - KERNEL_NV_INDEX, locked with physical presence. */
#define ROLLBACK_SPACE_KERNEL_VERSION 1
#define ROLLBACK_SPACE_KERNEL_VERSION 2
#define ROLLBACK_SPACE_KERNEL_UID 0x4752574C /* 'GRWL' */
typedef struct RollbackSpaceKernel {
uint8_t struct_version; /* Struct version, for backwards
* compatibility */
uint32_t uid; /* Unique ID to detect space redefinition */
uint32_t kernel_versions; /* Kernel versions */
uint32_t reserved; /* Reserved for future expansion */
uint8_t reserved[3]; /* Reserved for future expansion */
uint8_t crc8; /* Checksum (v2 and later only) */
} __attribute__((packed)) RollbackSpaceKernel;
@@ -41,13 +42,14 @@ typedef struct RollbackSpaceKernel {
* from the backup copy. */
#define FLAG_KERNEL_SPACE_USE_BACKUP 0x02
#define ROLLBACK_SPACE_FIRMWARE_VERSION 1
#define ROLLBACK_SPACE_FIRMWARE_VERSION 2
/* Firmware space - FIRMWARE_NV_INDEX, locked with global lock. */
typedef struct RollbackSpaceFirmware {
uint8_t struct_version; /* Struct version, for backwards compatibility */
uint8_t flags; /* Flags (see FLAG_* above) */
uint32_t fw_versions; /* Firmware versions */
uint32_t reserved; /* Reserved for future expansion */
uint8_t reserved[3]; /* Reserved for future expansion */
uint8_t crc8; /* Checksum (v2 and later only) */
} __attribute__((packed)) RollbackSpaceFirmware;
__pragma(pack(pop)) /* Support packing for MSVC. */