diff options
Diffstat (limited to 'src/security/vboot/secdata_tpm.c')
| -rw-r--r-- | src/security/vboot/secdata_tpm.c | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/src/security/vboot/secdata_tpm.c b/src/security/vboot/secdata_tpm.c index a95e7d10a5..0bc4f839fe 100644 --- a/src/security/vboot/secdata_tpm.c +++ b/src/security/vboot/secdata_tpm.c @@ -58,16 +58,22 @@ uint32_t antirollback_read_space_kernel(struct vb2_context *ctx) } } - uint8_t size = VB2_SECDATA_KERNEL_MIN_SIZE; - - RETURN_ON_FAILURE(tlcl_read(KERNEL_NV_INDEX, ctx->secdata_kernel, - size)); + uint8_t size = VB2_SECDATA_KERNEL_SIZE; + uint32_t ret; + + /* Start with the version 1.0 size used by all modern cr50-boards. */ + ret = tlcl_read(KERNEL_NV_INDEX, ctx->secdata_kernel, size); + if (ret == TPM_E_RANGE) { + /* Fallback to version 0.2(minimum) size and re-read. */ + VBDEBUG("Antirollback: NV read out of range, trying min size\n"); + size = VB2_SECDATA_KERNEL_MIN_SIZE; + ret = tlcl_read(KERNEL_NV_INDEX, ctx->secdata_kernel, size); + } + RETURN_ON_FAILURE(ret); - if (vb2api_secdata_kernel_check(ctx, &size) - == VB2_ERROR_SECDATA_KERNEL_INCOMPLETE) + if (vb2api_secdata_kernel_check(ctx, &size) == VB2_ERROR_SECDATA_KERNEL_INCOMPLETE) /* Re-read. vboot will run the check and handle errors. */ - RETURN_ON_FAILURE(tlcl_read(KERNEL_NV_INDEX, - ctx->secdata_kernel, size)); + RETURN_ON_FAILURE(tlcl_read(KERNEL_NV_INDEX, ctx->secdata_kernel, size)); return TPM_SUCCESS; } |