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vboot2: factory-initialize kernel space in tpm 

this change makes coreboot initialize kernel space and backup space in the tpm
when no firmware space is found in the tpm.

BUG=chrome-os-partner:32410
TEST=Forced factory initialization and verified it went through without errors.
BRANCH=None
Signed-off-by: Daisuke Nojiri <dnojiri@chromium.org>

Original-Change-Id: I777e3cb7004870c769163827543c83665d3732b9
Original-Reviewed-on: https://chromium-review.googlesource.com/220412
Original-Reviewed-by: Julius Werner <jwerner@chromium.org>
Original-Reviewed-by: Randall Spangler <rspangler@chromium.org>
Original-Commit-Queue: Daisuke Nojiri <dnojiri@chromium.org>
Original-Tested-by: Daisuke Nojiri <dnojiri@chromium.org>
(cherry picked from commit d8c0c407bf0fed60d76441ada7bedd36f6fc3a38)

Change-Id: Icc3779125262b4499e47781991ebbf584abf074a
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/8885
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
This commit is contained in:
Daisuke Nojiri 2014-09-29 13:02:29 -07:00 committed by Aaron Durbin
parent 6abe7c6996
commit 97ea9c0516
2 changed files with 49 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
src/include/antirollback.h
View File

@ -15,6 +15,9 @@
/* TPM NVRAM location indices. */
#define FIRMWARE_NV_INDEX 0x1007
#define KERNEL_NV_INDEX 0x1008
/* This is just an opaque space for backup purposes */
#define BACKUP_NV_INDEX 0x1009
/* Structure definitions for TPM spaces */

61
src/vendorcode/google/chromeos/antirollback.c
View File

@ -34,7 +34,6 @@
} \
} while (0)
uint32_t tpm_clear_and_reenable(void)
{
VBDEBUG("TPM: Clear and re-enable\n");
@ -85,30 +84,36 @@ static uint32_t read_space_firmware(struct vb2_context *ctx)
return TPM_E_CORRUPTED_STATE;
}
static uint32_t write_space_firmware(struct vb2_context *ctx)
static uint32_t write_secdata(uint32_t index,
const uint8_t *secdata,
uint32_t len)
{
uint8_t secdata[VB2_SECDATA_SIZE];
uint32_t r;
uint8_t sd[32];
uint32_t rv;
int attempts = 3;
memcpy(secdata, ctx->secdata, VB2_SECDATA_SIZE);
if (len > sizeof(sd)) {
VBDEBUG("TPM: %s() - data is too large\n", __func__);
return TPM_E_WRITE_FAILURE;
}
while (attempts--) {
r = safe_write(FIRMWARE_NV_INDEX, secdata, VB2_SECDATA_SIZE);
rv = safe_write(index, secdata, len);
/* Can't write, not gonna try again */
if (r != TPM_SUCCESS)
return r;
if (rv != TPM_SUCCESS)
return rv;
/* Read it back to be sure it got the right values. */
r = read_space_firmware(ctx);
if (r == TPM_SUCCESS && memcmp(secdata, ctx->secdata,
VB2_SECDATA_SIZE) == 0)
return r;
rv = tlcl_read(index, sd, len);
if (rv == TPM_SUCCESS && memcmp(secdata, sd, len) == 0)
return rv;
VBDEBUG("TPM: %s() failed\n", __func__);
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;
}
@ -116,6 +121,15 @@ uint32_t factory_initialize_tpm(struct vb2_context *ctx)
{
TPM_PERMANENT_FLAGS pflags;
uint32_t result;
/* 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,
};
VBDEBUG("TPM: factory initialization\n");
@ -161,13 +175,30 @@ uint32_t factory_initialize_tpm(struct vb2_context *ctx)
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_space_firmware(ctx));
RETURN_ON_FAILURE(write_secdata(FIRMWARE_NV_INDEX,
ctx->secdata,
VB2_SECDATA_SIZE));
VBDEBUG("TPM: factory initialization successful\n");
return TPM_SUCCESS;
}
@ -289,7 +320,7 @@ uint32_t antirollback_read_space_firmware(struct vb2_context *ctx)
uint32_t antirollback_write_space_firmware(struct vb2_context *ctx)
{
return write_space_firmware(ctx);
return write_secdata(FIRMWARE_NV_INDEX, ctx->secdata, VB2_SECDATA_SIZE);
}
uint32_t antirollback_lock_space_firmware()