diff options
Diffstat (limited to 'firmware/2lib/2secdata_firmware.c')
-rw-r--r-- | firmware/2lib/2secdata_firmware.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/firmware/2lib/2secdata_firmware.c b/firmware/2lib/2secdata_firmware.c new file mode 100644 index 00000000..1ce5b29b --- /dev/null +++ b/firmware/2lib/2secdata_firmware.c @@ -0,0 +1,143 @@ +/* Copyright (c) 2014 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 + */ + +#include "2sysincludes.h" +#include "2common.h" +#include "2crc8.h" +#include "2misc.h" +#include "2secdata.h" + +vb2_error_t vb2api_secdata_firmware_check(struct vb2_context *ctx) +{ + struct vb2_secdata_firmware *sec = + (struct vb2_secdata_firmware *)ctx->secdata_firmware; + + /* Verify CRC */ + if (sec->crc8 != vb2_crc8(sec, offsetof(struct vb2_secdata_firmware, + crc8))) { + VB2_DEBUG("secdata_firmware: bad CRC\n"); + return VB2_ERROR_SECDATA_FIRMWARE_CRC; + } + + /* Verify version */ + if (sec->struct_version < VB2_SECDATA_FIRMWARE_VERSION) { + VB2_DEBUG("secdata_firmware: version incompatible\n"); + return VB2_ERROR_SECDATA_FIRMWARE_VERSION; + } + + return VB2_SUCCESS; +} + +vb2_error_t vb2api_secdata_firmware_create(struct vb2_context *ctx) +{ + struct vb2_secdata_firmware *sec = + (struct vb2_secdata_firmware *)ctx->secdata_firmware; + + /* Clear the entire struct */ + memset(sec, 0, sizeof(*sec)); + + /* Set to current version */ + sec->struct_version = VB2_SECDATA_FIRMWARE_VERSION; + + /* Calculate initial CRC */ + sec->crc8 = vb2_crc8(sec, offsetof(struct vb2_secdata_firmware, crc8)); + + /* Mark as changed */ + ctx->flags |= VB2_CONTEXT_SECDATA_FIRMWARE_CHANGED; + + return VB2_SUCCESS; +} + +vb2_error_t vb2_secdata_firmware_init(struct vb2_context *ctx) +{ + struct vb2_shared_data *sd = vb2_get_sd(ctx); + vb2_error_t rv; + + rv = vb2api_secdata_firmware_check(ctx); + if (rv) + return rv; + + /* Set status flag */ + sd->status |= VB2_SD_STATUS_SECDATA_FIRMWARE_INIT; + + /* Read this now to make sure crossystem has it even in rec mode. */ + rv = vb2_secdata_firmware_get(ctx, VB2_SECDATA_FIRMWARE_VERSIONS, + &sd->fw_version_secdata); + if (rv) + return rv; + + return VB2_SUCCESS; +} + +vb2_error_t vb2_secdata_firmware_get(struct vb2_context *ctx, + enum vb2_secdata_firmware_param param, + uint32_t *dest) +{ + struct vb2_shared_data *sd = vb2_get_sd(ctx); + struct vb2_secdata_firmware *sec = + (struct vb2_secdata_firmware *)ctx->secdata_firmware; + + if (!(sd->status & VB2_SD_STATUS_SECDATA_FIRMWARE_INIT)) + return VB2_ERROR_SECDATA_FIRMWARE_GET_UNINITIALIZED; + + switch (param) { + case VB2_SECDATA_FIRMWARE_FLAGS: + *dest = sec->flags; + return VB2_SUCCESS; + + case VB2_SECDATA_FIRMWARE_VERSIONS: + *dest = sec->fw_versions; + return VB2_SUCCESS; + + default: + return VB2_ERROR_SECDATA_FIRMWARE_GET_PARAM; + } +} + +vb2_error_t vb2_secdata_firmware_set(struct vb2_context *ctx, + enum vb2_secdata_firmware_param param, + uint32_t value) +{ + struct vb2_secdata_firmware *sec = + (struct vb2_secdata_firmware *)ctx->secdata_firmware; + uint32_t now; + + if (!(vb2_get_sd(ctx)->status & VB2_SD_STATUS_SECDATA_FIRMWARE_INIT)) + return VB2_ERROR_SECDATA_FIRMWARE_SET_UNINITIALIZED; + + /* If not changing the value, don't regenerate the CRC. */ + if (vb2_secdata_firmware_get(ctx, param, &now) == VB2_SUCCESS && + now == value) + return VB2_SUCCESS; + + switch (param) { + case VB2_SECDATA_FIRMWARE_FLAGS: + /* Make sure flags is in valid range */ + if (value > 0xff) + return VB2_ERROR_SECDATA_FIRMWARE_SET_FLAGS; + + VB2_DEBUG("secdata_firmware flags updated from 0x%x to 0x%x\n", + sec->flags, value); + sec->flags = value; + break; + + case VB2_SECDATA_FIRMWARE_VERSIONS: + VB2_DEBUG("secdata_firmware versions updated from " + "0x%x to 0x%x\n", + sec->fw_versions, value); + sec->fw_versions = value; + break; + + default: + return VB2_ERROR_SECDATA_FIRMWARE_SET_PARAM; + } + + /* Regenerate CRC */ + sec->crc8 = vb2_crc8(sec, offsetof(struct vb2_secdata_firmware, crc8)); + ctx->flags |= VB2_CONTEXT_SECDATA_FIRMWARE_CHANGED; + return VB2_SUCCESS; +} |