1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (C) 2017 Google
6 * Thiebaud Weksteen <tweek@google.com>
10 #include <linux/tpm_eventlog.h>
15 /* read binary bios log from EFI configuration table */
16 int tpm_read_log_efi(struct tpm_chip *chip)
19 struct efi_tcg2_final_events_table *final_tbl = NULL;
20 struct linux_efi_tpm_eventlog *log_tbl;
21 struct tpm_bios_log *log;
27 if (!(chip->flags & TPM_CHIP_FLAG_TPM2))
30 if (efi.tpm_log == EFI_INVALID_TABLE_ADDR)
35 log_tbl = memremap(efi.tpm_log, sizeof(*log_tbl), MEMREMAP_WB);
37 pr_err("Could not map UEFI TPM log table !\n");
41 log_size = log_tbl->size;
44 log_tbl = memremap(efi.tpm_log, sizeof(*log_tbl) + log_size,
47 pr_err("Could not map UEFI TPM log table payload!\n");
51 /* malloc EventLog space */
52 log->bios_event_log = kmemdup(log_tbl->log, log_size, GFP_KERNEL);
53 if (!log->bios_event_log) {
58 log->bios_event_log_end = log->bios_event_log + log_size;
59 tpm_log_version = log_tbl->version;
61 ret = tpm_log_version;
63 if (efi.tpm_final_log == EFI_INVALID_TABLE_ADDR ||
64 efi_tpm_final_log_size == 0 ||
65 tpm_log_version != EFI_TCG2_EVENT_LOG_FORMAT_TCG_2)
68 final_tbl = memremap(efi.tpm_final_log,
69 sizeof(*final_tbl) + efi_tpm_final_log_size,
72 pr_err("Could not map UEFI TPM final log\n");
73 kfree(log->bios_event_log);
78 efi_tpm_final_log_size -= log_tbl->final_events_preboot_size;
80 tmp = krealloc(log->bios_event_log,
81 log_size + efi_tpm_final_log_size,
84 kfree(log->bios_event_log);
89 log->bios_event_log = tmp;
92 * Copy any of the final events log that didn't also end up in the
93 * main log. Events can be logged in both if events are generated
94 * between GetEventLog() and ExitBootServices().
96 memcpy((void *)log->bios_event_log + log_size,
97 final_tbl->events + log_tbl->final_events_preboot_size,
98 efi_tpm_final_log_size);
99 log->bios_event_log_end = log->bios_event_log +
100 log_size + efi_tpm_final_log_size;