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fe6a06fbf6
Allow TPM to log events in a circular buffer through tpm_log_event(). Logs can be retrieved through a new vendor command VENDOR_CC_POP_LOG_ENTRY. BUG=b:63760920 TEST=On eve, store TPM logs through 'logentry' cr50 console command, verify logs are fetched correctly through 'trunks_send --pop_logentry'. BRANCH=None Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org> Change-Id: Idbc405728c0ba68078447fb59717d6115830e3d8 Reviewed-on: https://chromium-review.googlesource.com/599352 Commit-Ready: Shawn N <shawnn@chromium.org> Tested-by: Shawn N <shawnn@chromium.org> Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
80 lines
1.8 KiB
C
80 lines
1.8 KiB
C
/* Copyright 2017 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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#include "console.h"
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#include "endian.h"
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#include "extension.h"
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#include "host_command.h"
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#include "timer.h"
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#include "tpm_log.h"
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#include "tpm_vendor_cmds.h"
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#include "usb_pd.h"
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#include "util.h"
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/*
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* TPM event logging uses the standard 'event_log_entry' as its storage,
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* with no additional payload bytes.
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*/
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#define TPM_EVENT_LOG_SIZE sizeof(struct event_log_entry)
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void tpm_log_event(enum tpm_event type, uint16_t data)
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{
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uint32_t timestamp = get_time().val >> EVENT_LOG_TIMESTAMP_SHIFT;
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log_add_event(type, 0, data, NULL, timestamp);
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}
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static enum vendor_cmd_rc vc_pop_log_entry(enum vendor_cmd_cc code,
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void *buf,
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size_t input_size,
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size_t *response_size)
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{
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struct event_log_entry *entry = buf;
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int byte_size = log_dequeue_event(entry);
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if (entry->type == EVENT_LOG_NO_ENTRY) {
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*response_size = 0;
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return VENDOR_RC_SUCCESS;
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}
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if (byte_size != TPM_EVENT_LOG_SIZE)
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return VENDOR_RC_INTERNAL_ERROR;
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entry->timestamp = htobe32(entry->timestamp);
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entry->data = htobe16(entry->data);
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*response_size = byte_size;
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return VENDOR_RC_SUCCESS;
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}
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DECLARE_VENDOR_COMMAND(VENDOR_CC_POP_LOG_ENTRY, vc_pop_log_entry);
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#ifdef CONFIG_CMD_TPM_LOG
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/* Store an entry in the TPM event log, for testing. */
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int command_tpm_log(int argc, char **argv)
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{
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enum tpm_event type = 0;
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uint16_t data = 0;
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char *e;
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if (argc >= 2) {
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type = strtoi(argv[1], &e, 10);
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if (*e)
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return EC_ERROR_PARAM1;
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}
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if (argc >= 3) {
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data = strtoi(argv[2], &e, 10);
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if (*e)
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return EC_ERROR_PARAM2;
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}
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tpm_log_event(type, data);
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return EC_SUCCESS;
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}
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DECLARE_CONSOLE_COMMAND(tpm_log,
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command_tpm_log,
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"<type> <data>",
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"Write an entry to TPM log");
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#endif /* CONFIG_CMD_TPM_LOG */
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