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124 lines
2.9 KiB
124 lines
2.9 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (C) 2017 Google |
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* |
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* Authors: |
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* Thiebaud Weksteen <[email protected]> |
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*/ |
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#include <linux/efi.h> |
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#include <linux/tpm_eventlog.h> |
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#include "../tpm.h" |
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#include "common.h" |
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/* read binary bios log from EFI configuration table */ |
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int tpm_read_log_efi(struct tpm_chip *chip) |
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{ |
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struct efi_tcg2_final_events_table *final_tbl = NULL; |
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int final_events_log_size = efi_tpm_final_log_size; |
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struct linux_efi_tpm_eventlog *log_tbl; |
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struct tpm_bios_log *log; |
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u32 log_size; |
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u8 tpm_log_version; |
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void *tmp; |
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int ret; |
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if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) |
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return -ENODEV; |
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if (efi.tpm_log == EFI_INVALID_TABLE_ADDR) |
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return -ENODEV; |
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log = &chip->log; |
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log_tbl = memremap(efi.tpm_log, sizeof(*log_tbl), MEMREMAP_WB); |
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if (!log_tbl) { |
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pr_err("Could not map UEFI TPM log table !\n"); |
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return -ENOMEM; |
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} |
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log_size = log_tbl->size; |
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memunmap(log_tbl); |
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if (!log_size) { |
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pr_warn("UEFI TPM log area empty\n"); |
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return -EIO; |
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} |
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log_tbl = memremap(efi.tpm_log, sizeof(*log_tbl) + log_size, |
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MEMREMAP_WB); |
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if (!log_tbl) { |
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pr_err("Could not map UEFI TPM log table payload!\n"); |
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return -ENOMEM; |
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} |
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/* malloc EventLog space */ |
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log->bios_event_log = kmemdup(log_tbl->log, log_size, GFP_KERNEL); |
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if (!log->bios_event_log) { |
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ret = -ENOMEM; |
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goto out; |
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} |
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log->bios_event_log_end = log->bios_event_log + log_size; |
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tpm_log_version = log_tbl->version; |
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ret = tpm_log_version; |
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if (efi.tpm_final_log == EFI_INVALID_TABLE_ADDR || |
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final_events_log_size == 0 || |
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tpm_log_version != EFI_TCG2_EVENT_LOG_FORMAT_TCG_2) |
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goto out; |
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final_tbl = memremap(efi.tpm_final_log, |
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sizeof(*final_tbl) + final_events_log_size, |
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MEMREMAP_WB); |
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if (!final_tbl) { |
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pr_err("Could not map UEFI TPM final log\n"); |
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kfree(log->bios_event_log); |
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ret = -ENOMEM; |
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goto out; |
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} |
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/* |
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* The 'final events log' size excludes the 'final events preboot log' |
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* at its beginning. |
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*/ |
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final_events_log_size -= log_tbl->final_events_preboot_size; |
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/* |
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* Allocate memory for the 'combined log' where we will append the |
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* 'final events log' to. |
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*/ |
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tmp = krealloc(log->bios_event_log, |
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log_size + final_events_log_size, |
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GFP_KERNEL); |
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if (!tmp) { |
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kfree(log->bios_event_log); |
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ret = -ENOMEM; |
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goto out; |
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} |
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log->bios_event_log = tmp; |
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/* |
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* Append any of the 'final events log' that didn't also end up in the |
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* 'main log'. Events can be logged in both if events are generated |
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* between GetEventLog() and ExitBootServices(). |
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*/ |
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memcpy((void *)log->bios_event_log + log_size, |
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final_tbl->events + log_tbl->final_events_preboot_size, |
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final_events_log_size); |
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/* |
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* The size of the 'combined log' is the size of the 'main log' plus |
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* the size of the 'final events log'. |
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*/ |
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log->bios_event_log_end = log->bios_event_log + |
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log_size + final_events_log_size; |
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out: |
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memunmap(final_tbl); |
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memunmap(log_tbl); |
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return ret; |
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}
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