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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/drivers/firmware/efi/tpm.c
..
..
@@ -1,17 +1,37 @@
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+// 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 <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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5
  */
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6
 
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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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+
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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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15
 
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-#include <asm/early_ioremap.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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+
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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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+
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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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+
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+	return size;
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+}
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35
 
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 /*
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  * Reserve the memory associated with the TPM Event Log configuration table.
..
..
@@ -19,22 +39,72 @@
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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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+	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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45
 
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-	if (efi.tpm_log == EFI_INVALID_TABLE_ADDR)
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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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53
 
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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);
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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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61
 
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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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+
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+	if (efi.tpm_final_log == EFI_INVALID_TABLE_ADDR) {
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+		pr_info("TPM Final Events table not present\n");
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+		goto out;
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+	} else if (log_tbl->version != EFI_TCG2_EVENT_LOG_FORMAT_TCG_2) {
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+		pr_warn(FW_BUG "TPM Final Events table invalid\n");
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+		goto out;
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+	}
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+
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+	final_tbl = early_memremap(efi.tpm_final_log, sizeof(*final_tbl));
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+
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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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+
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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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+
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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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+
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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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+
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+	memblock_reserve(efi.tpm_final_log,
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+			 tbl_size + sizeof(*final_tbl));
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+	efi_tpm_final_log_size = tbl_size;
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+
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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 0;
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+	return ret;
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 }
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