From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- drivers/char/tpm/eventlog/efi.c | 71 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) create mode 100644 drivers/char/tpm/eventlog/efi.c (limited to 'drivers/char/tpm/eventlog/efi.c') diff --git a/drivers/char/tpm/eventlog/efi.c b/drivers/char/tpm/eventlog/efi.c new file mode 100644 index 000000000..abd3beeb5 --- /dev/null +++ b/drivers/char/tpm/eventlog/efi.c @@ -0,0 +1,71 @@ +/* + * Copyright (C) 2017 Google + * + * Authors: + * Thiebaud Weksteen + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + * + */ + +#include +#include + +#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); + + if (!log_size) { + pr_warn("UEFI TPM log area empty\n"); + return -EIO; + } + + 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; +} -- cgit v1.2.3