// SPDX-License-Identifier: GPL-2.0-or-later /* * Copyright (C) 2017 Google * * Authors: * Thiebaud Weksteen <tweek@google.com> */ #include <linux/efi.h> #include <linux/tpm_eventlog.h> #include "../tpm.h" #include "common.h" /* read binary bios log from EFI configuration table */ int tpm_read_log_efi(struct tpm_chip *chip) { struct linux_efi_tpm_eventlog *log_tbl; struct tpm_bios_log *log; u32 log_size; u8 tpm_log_version; if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) return -ENODEV; if (efi.tpm_log == EFI_INVALID_TABLE_ADDR) return -ENODEV; log = &chip->log; log_tbl = memremap(efi.tpm_log, sizeof(*log_tbl), MEMREMAP_WB); if (!log_tbl) { pr_err("Could not map UEFI TPM log table !\n"); return -ENOMEM; } log_size = log_tbl->size; memunmap(log_tbl); log_tbl = memremap(efi.tpm_log, sizeof(*log_tbl) + log_size, MEMREMAP_WB); if (!log_tbl) { pr_err("Could not map UEFI TPM log table payload!\n"); return -ENOMEM; } /* malloc EventLog space */ log->bios_event_log = kmemdup(log_tbl->log, log_size, GFP_KERNEL); if (!log->bios_event_log) goto err_memunmap; log->bios_event_log_end = log->bios_event_log + log_size; tpm_log_version = log_tbl->version; memunmap(log_tbl); return tpm_log_version; err_memunmap: memunmap(log_tbl); return -ENOMEM; }