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108 lines
2.6 KiB
108 lines
2.6 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (C) 2017 Google, Inc. |
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* Thiebaud Weksteen <[email protected]> |
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*/ |
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#define TPM_MEMREMAP(start, size) early_memremap(start, size) |
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#define TPM_MEMUNMAP(start, size) early_memunmap(start, size) |
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#include <asm/early_ioremap.h> |
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#include <linux/efi.h> |
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#include <linux/init.h> |
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#include <linux/memblock.h> |
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#include <linux/tpm_eventlog.h> |
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int efi_tpm_final_log_size; |
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EXPORT_SYMBOL(efi_tpm_final_log_size); |
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static int __init tpm2_calc_event_log_size(void *data, int count, void *size_info) |
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{ |
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struct tcg_pcr_event2_head *header; |
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int event_size, size = 0; |
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while (count > 0) { |
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header = data + size; |
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event_size = __calc_tpm2_event_size(header, size_info, true); |
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if (event_size == 0) |
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return -1; |
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size += event_size; |
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count--; |
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} |
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return size; |
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} |
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/* |
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* Reserve the memory associated with the TPM Event Log configuration table. |
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*/ |
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int __init efi_tpm_eventlog_init(void) |
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{ |
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struct linux_efi_tpm_eventlog *log_tbl; |
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struct efi_tcg2_final_events_table *final_tbl; |
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int tbl_size; |
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int ret = 0; |
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if (efi.tpm_log == EFI_INVALID_TABLE_ADDR) { |
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/* |
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* We can't calculate the size of the final events without the |
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* first entry in the TPM log, so bail here. |
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*/ |
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return 0; |
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} |
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log_tbl = early_memremap(efi.tpm_log, sizeof(*log_tbl)); |
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if (!log_tbl) { |
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pr_err("Failed to map TPM Event Log table @ 0x%lx\n", |
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efi.tpm_log); |
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efi.tpm_log = EFI_INVALID_TABLE_ADDR; |
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return -ENOMEM; |
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} |
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tbl_size = sizeof(*log_tbl) + log_tbl->size; |
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memblock_reserve(efi.tpm_log, tbl_size); |
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if (efi.tpm_final_log == EFI_INVALID_TABLE_ADDR || |
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log_tbl->version != EFI_TCG2_EVENT_LOG_FORMAT_TCG_2) { |
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pr_warn(FW_BUG "TPM Final Events table missing or invalid\n"); |
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goto out; |
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} |
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final_tbl = early_memremap(efi.tpm_final_log, sizeof(*final_tbl)); |
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if (!final_tbl) { |
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pr_err("Failed to map TPM Final Event Log table @ 0x%lx\n", |
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efi.tpm_final_log); |
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efi.tpm_final_log = EFI_INVALID_TABLE_ADDR; |
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ret = -ENOMEM; |
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goto out; |
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} |
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tbl_size = 0; |
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if (final_tbl->nr_events != 0) { |
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void *events = (void *)efi.tpm_final_log |
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+ sizeof(final_tbl->version) |
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+ sizeof(final_tbl->nr_events); |
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tbl_size = tpm2_calc_event_log_size(events, |
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final_tbl->nr_events, |
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log_tbl->log); |
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} |
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if (tbl_size < 0) { |
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pr_err(FW_BUG "Failed to parse event in TPM Final Events Log\n"); |
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ret = -EINVAL; |
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goto out_calc; |
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} |
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memblock_reserve((unsigned long)final_tbl, |
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tbl_size + sizeof(*final_tbl)); |
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efi_tpm_final_log_size = tbl_size; |
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out_calc: |
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early_memunmap(final_tbl, sizeof(*final_tbl)); |
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out: |
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early_memunmap(log_tbl, sizeof(*log_tbl)); |
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return ret; |
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} |
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