| /* Copyright 2015 The Chromium OS Authors. All rights reserved. |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| * |
| * Secure storage APIs - kernel version space |
| */ |
| |
| #include "2common.h" |
| #include "2crc8.h" |
| #include "2misc.h" |
| #include "2secdata.h" |
| #include "2secdata_struct.h" |
| #include "2sysincludes.h" |
| |
| vb2_error_t vb2api_secdata_kernel_check(struct vb2_context *ctx) |
| { |
| struct vb2_secdata_kernel *sec = |
| (struct vb2_secdata_kernel *)ctx->secdata_kernel; |
| |
| /* Verify CRC */ |
| if (sec->crc8 != vb2_crc8(sec, offsetof(struct vb2_secdata_kernel, |
| crc8))) { |
| VB2_DEBUG("secdata_kernel: bad CRC\n"); |
| return VB2_ERROR_SECDATA_KERNEL_CRC; |
| } |
| |
| /* Verify version */ |
| if (sec->struct_version < VB2_SECDATA_KERNEL_VERSION) { |
| VB2_DEBUG("secdata_firmware: version incompatible\n"); |
| return VB2_ERROR_SECDATA_KERNEL_VERSION; |
| } |
| |
| /* Verify UID */ |
| if (sec->uid != VB2_SECDATA_KERNEL_UID) { |
| VB2_DEBUG("secdata_kernel: bad UID\n"); |
| return VB2_ERROR_SECDATA_KERNEL_UID; |
| } |
| |
| return VB2_SUCCESS; |
| } |
| |
| uint32_t vb2api_secdata_kernel_create(struct vb2_context *ctx) |
| { |
| struct vb2_secdata_kernel *sec = |
| (struct vb2_secdata_kernel *)ctx->secdata_kernel; |
| |
| /* Clear the entire struct */ |
| memset(sec, 0, sizeof(*sec)); |
| |
| /* Set to current version */ |
| sec->struct_version = VB2_SECDATA_KERNEL_VERSION; |
| |
| /* Set UID */ |
| sec->uid = VB2_SECDATA_KERNEL_UID; |
| |
| /* Calculate initial CRC */ |
| sec->crc8 = vb2_crc8(sec, offsetof(struct vb2_secdata_kernel, crc8)); |
| |
| /* Mark as changed */ |
| ctx->flags |= VB2_CONTEXT_SECDATA_KERNEL_CHANGED; |
| |
| return sizeof(*sec); |
| } |
| |
| vb2_error_t vb2_secdata_kernel_init(struct vb2_context *ctx) |
| { |
| struct vb2_shared_data *sd = vb2_get_sd(ctx); |
| vb2_error_t rv; |
| |
| rv = vb2api_secdata_kernel_check(ctx); |
| if (rv) |
| return rv; |
| |
| /* Set status flag */ |
| sd->status |= VB2_SD_STATUS_SECDATA_KERNEL_INIT; |
| |
| return VB2_SUCCESS; |
| } |
| |
| vb2_error_t vb2_secdata_kernel_get(struct vb2_context *ctx, |
| enum vb2_secdata_kernel_param param, |
| uint32_t *dest) |
| { |
| struct vb2_shared_data *sd = vb2_get_sd(ctx); |
| struct vb2_secdata_kernel *sec = |
| (struct vb2_secdata_kernel *)ctx->secdata_kernel; |
| |
| if (!(sd->status & VB2_SD_STATUS_SECDATA_KERNEL_INIT)) |
| return VB2_ERROR_SECDATA_KERNEL_GET_UNINITIALIZED; |
| |
| switch (param) { |
| case VB2_SECDATA_KERNEL_VERSIONS: |
| *dest = sec->kernel_versions; |
| return VB2_SUCCESS; |
| |
| default: |
| return VB2_ERROR_SECDATA_KERNEL_GET_PARAM; |
| } |
| } |
| |
| vb2_error_t vb2_secdata_kernel_set(struct vb2_context *ctx, |
| enum vb2_secdata_kernel_param param, |
| uint32_t value) |
| { |
| struct vb2_shared_data *sd = vb2_get_sd(ctx); |
| struct vb2_secdata_kernel *sec = |
| (struct vb2_secdata_kernel *)ctx->secdata_kernel; |
| uint32_t now; |
| |
| if (!(sd->status & VB2_SD_STATUS_SECDATA_KERNEL_INIT)) |
| return VB2_ERROR_SECDATA_KERNEL_SET_UNINITIALIZED; |
| |
| /* If not changing the value, don't regenerate the CRC */ |
| if (vb2_secdata_kernel_get(ctx, param, &now) == VB2_SUCCESS && |
| now == value) |
| return VB2_SUCCESS; |
| |
| switch (param) { |
| case VB2_SECDATA_KERNEL_VERSIONS: |
| VB2_DEBUG("secdata_kernel versions updated from 0x%x to 0x%x\n", |
| sec->kernel_versions, value); |
| sec->kernel_versions = value; |
| break; |
| |
| default: |
| return VB2_ERROR_SECDATA_KERNEL_SET_PARAM; |
| } |
| |
| /* Regenerate CRC */ |
| sec->crc8 = vb2_crc8(sec, offsetof(struct vb2_secdata_kernel, crc8)); |
| ctx->flags |= VB2_CONTEXT_SECDATA_KERNEL_CHANGED; |
| return VB2_SUCCESS; |
| } |