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bf9c2760d2
Holds kernel rollback information. Will be used by vboot 2.0 kernel verification. BUG=chromium:487699 BRANCH=none TEST=make -j runtests Change-Id: Ib4a70e943ebd79aac06404df09cf4ce62d719201 Signed-off-by: Randall Spangler <rspangler@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/270626 Reviewed-by: Bill Richardson <wfrichar@chromium.org>
113 lines
2.7 KiB
C
113 lines
2.7 KiB
C
/* Copyright 2015 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Secure storage APIs - kernel version space
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*/
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#include "2sysincludes.h"
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#include "2common.h"
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#include "2crc8.h"
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#include "2misc.h"
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#include "2secdata.h"
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int vb2_secdatak_check_crc(const struct vb2_context *ctx)
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{
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const struct vb2_secdatak *sec =
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(const struct vb2_secdatak *)ctx->secdatak;
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/* Verify CRC */
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if (sec->crc8 != vb2_crc8(sec, offsetof(struct vb2_secdatak, crc8)))
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return VB2_ERROR_SECDATAK_CRC;
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return VB2_SUCCESS;
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}
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int vb2_secdatak_create(struct vb2_context *ctx)
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{
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struct vb2_secdatak *sec = (struct vb2_secdatak *)ctx->secdatak;
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/* Clear the entire struct */
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memset(sec, 0, sizeof(*sec));
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/* Set to current version */
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sec->struct_version = VB2_SECDATAK_VERSION;
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/* Set UID */
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sec->uid = VB2_SECDATAK_UID;
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/* Calculate initial CRC */
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sec->crc8 = vb2_crc8(sec, offsetof(struct vb2_secdatak, crc8));
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ctx->flags |= VB2_CONTEXT_SECDATAK_CHANGED;
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return VB2_SUCCESS;
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}
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int vb2_secdatak_init(struct vb2_context *ctx)
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{
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struct vb2_secdatak *sec = (struct vb2_secdatak *)ctx->secdatak;
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struct vb2_shared_data *sd = vb2_get_sd(ctx);
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int rv;
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rv = vb2_secdatak_check_crc(ctx);
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if (rv)
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return rv;
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/* Make sure the UID is correct */
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if (sec->uid != VB2_SECDATAK_UID)
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return VB2_ERROR_SECDATAK_UID;
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/* Set status flag */
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sd->status |= VB2_SD_STATUS_SECDATAK_INIT;
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/* TODO: unit test for that */
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return VB2_SUCCESS;
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}
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int vb2_secdatak_get(struct vb2_context *ctx,
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enum vb2_secdatak_param param,
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uint32_t *dest)
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{
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struct vb2_secdatak *sec = (struct vb2_secdatak *)ctx->secdatak;
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if (!(vb2_get_sd(ctx)->status & VB2_SD_STATUS_SECDATAK_INIT))
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return VB2_ERROR_SECDATAK_GET_UNINITIALIZED;
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switch(param) {
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case VB2_SECDATAK_VERSIONS:
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*dest = sec->kernel_versions;
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return VB2_SUCCESS;
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default:
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return VB2_ERROR_SECDATAK_GET_PARAM;
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}
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}
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int vb2_secdatak_set(struct vb2_context *ctx,
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enum vb2_secdatak_param param,
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uint32_t value)
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{
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struct vb2_secdatak *sec = (struct vb2_secdatak *)ctx->secdatak;
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uint32_t now;
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if (!(vb2_get_sd(ctx)->status & VB2_SD_STATUS_SECDATAK_INIT))
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return VB2_ERROR_SECDATAK_SET_UNINITIALIZED;
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/* If not changing the value, don't regenerate the CRC. */
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if (vb2_secdatak_get(ctx, param, &now) == VB2_SUCCESS && now == value)
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return VB2_SUCCESS;
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switch(param) {
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case VB2_SECDATAK_VERSIONS:
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sec->kernel_versions = value;
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break;
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default:
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return VB2_ERROR_SECDATAK_SET_PARAM;
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}
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/* Regenerate CRC */
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sec->crc8 = vb2_crc8(sec, offsetof(struct vb2_secdatak, crc8));
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ctx->flags |= VB2_CONTEXT_SECDATAK_CHANGED;
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return VB2_SUCCESS;
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}
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