| /* 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 "2sysincludes.h" |
| #include "2common.h" |
| #include "2crc8.h" |
| #include "2misc.h" |
| #include "2secdata.h" |
| |
| int vb2_secdatak_check_crc(const struct vb2_context *ctx) |
| { |
| const struct vb2_secdatak *sec = |
| (const struct vb2_secdatak *)ctx->secdatak; |
| |
| /* Verify CRC */ |
| if (sec->crc8 != vb2_crc8(sec, offsetof(struct vb2_secdatak, crc8))) |
| return VB2_ERROR_SECDATAK_CRC; |
| |
| return VB2_SUCCESS; |
| } |
| |
| int vb2_secdatak_create(struct vb2_context *ctx) |
| { |
| struct vb2_secdatak *sec = (struct vb2_secdatak *)ctx->secdatak; |
| |
| /* Clear the entire struct */ |
| memset(sec, 0, sizeof(*sec)); |
| |
| /* Set to current version */ |
| sec->struct_version = VB2_SECDATAK_VERSION; |
| |
| /* Set UID */ |
| sec->uid = VB2_SECDATAK_UID; |
| |
| /* Calculate initial CRC */ |
| sec->crc8 = vb2_crc8(sec, offsetof(struct vb2_secdatak, crc8)); |
| ctx->flags |= VB2_CONTEXT_SECDATAK_CHANGED; |
| return VB2_SUCCESS; |
| } |
| |
| int vb2_secdatak_init(struct vb2_context *ctx) |
| { |
| struct vb2_secdatak *sec = (struct vb2_secdatak *)ctx->secdatak; |
| struct vb2_shared_data *sd = vb2_get_sd(ctx); |
| int rv; |
| |
| rv = vb2_secdatak_check_crc(ctx); |
| if (rv) |
| return rv; |
| |
| /* Make sure the UID is correct */ |
| if (sec->uid != VB2_SECDATAK_UID) |
| return VB2_ERROR_SECDATAK_UID; |
| |
| /* Set status flag */ |
| sd->status |= VB2_SD_STATUS_SECDATAK_INIT; |
| /* TODO: unit test for that */ |
| |
| return VB2_SUCCESS; |
| } |
| |
| int vb2_secdatak_get(struct vb2_context *ctx, |
| enum vb2_secdatak_param param, |
| uint32_t *dest) |
| { |
| struct vb2_secdatak *sec = (struct vb2_secdatak *)ctx->secdatak; |
| |
| if (!(vb2_get_sd(ctx)->status & VB2_SD_STATUS_SECDATAK_INIT)) |
| return VB2_ERROR_SECDATAK_GET_UNINITIALIZED; |
| |
| switch(param) { |
| case VB2_SECDATAK_VERSIONS: |
| *dest = sec->kernel_versions; |
| return VB2_SUCCESS; |
| |
| default: |
| return VB2_ERROR_SECDATAK_GET_PARAM; |
| } |
| } |
| |
| int vb2_secdatak_set(struct vb2_context *ctx, |
| enum vb2_secdatak_param param, |
| uint32_t value) |
| { |
| struct vb2_secdatak *sec = (struct vb2_secdatak *)ctx->secdatak; |
| uint32_t now; |
| |
| if (!(vb2_get_sd(ctx)->status & VB2_SD_STATUS_SECDATAK_INIT)) |
| return VB2_ERROR_SECDATAK_SET_UNINITIALIZED; |
| |
| /* If not changing the value, don't regenerate the CRC. */ |
| if (vb2_secdatak_get(ctx, param, &now) == VB2_SUCCESS && now == value) |
| return VB2_SUCCESS; |
| |
| switch(param) { |
| case VB2_SECDATAK_VERSIONS: |
| sec->kernel_versions = value; |
| break; |
| |
| default: |
| return VB2_ERROR_SECDATAK_SET_PARAM; |
| } |
| |
| /* Regenerate CRC */ |
| sec->crc8 = vb2_crc8(sec, offsetof(struct vb2_secdatak, crc8)); |
| ctx->flags |= VB2_CONTEXT_SECDATAK_CHANGED; |
| return VB2_SUCCESS; |
| } |