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33b6d03469
With TPM 2.0 specification, the event logs may only be accessible by
calling an EFI Boot Service. Modify the EFI stub to copy the log area to
a new Linux-specific EFI configuration table so it remains accessible
once booted.
When calling this service, it is possible to specify the expected format
of the logs: TPM 1.2 (SHA1) or TPM 2.0 ("Crypto Agile"). For now, only the
first format is retrieved.
Signed-off-by: Thiebaud Weksteen <tweek@google.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Tested-by: Javier Martinez Canillas <javierm@redhat.com>
Tested-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
40 lines
989 B
C
40 lines
989 B
C
/*
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* Copyright (C) 2017 Google, Inc.
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* Thiebaud Weksteen <tweek@google.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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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 <asm/early_ioremap.h>
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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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unsigned int tbl_size;
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if (efi.tpm_log == EFI_INVALID_TABLE_ADDR)
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return 0;
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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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early_memunmap(log_tbl, sizeof(*log_tbl));
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return 0;
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}
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