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authorDaisuke Nojiri <dnojiri@chromium.org>2014-09-29 13:02:29 -0700
committerAaron Durbin <adurbin@google.com>2015-03-24 15:19:54 +0100
commit97ea9c05160c9c1aec82f7bda2fe3ec963c8adf4 (patch)
tree1adc1125197d3d6d11249ca61338881ded15f8d4 /src/vendorcode
parent6abe7c699679e27d0ae84b803994e5eacfaea538 (diff)
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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>
Diffstat (limited to 'src/vendorcode')
-rw-r--r--src/vendorcode/google/chromeos/antirollback.c61
1 files changed, 46 insertions, 15 deletions
diff --git a/src/vendorcode/google/chromeos/antirollback.c b/src/vendorcode/google/chromeos/antirollback.c
index 020a06abb..bb547b51b 100644
--- a/src/vendorcode/google/chromeos/antirollback.c
+++ b/src/vendorcode/google/chromeos/antirollback.c
@@ -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()