Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit c5df3926 authored by Ashley Lai's avatar Ashley Lai Committed by Kent Yoder
Browse files

drivers/char/tpm: Add securityfs support for event log 



This patch retrieves the event log data from the device tree
during file open. The event log data will then displayed through
securityfs.

Signed-off-by: default avatarAshley Lai <adlai@us.ibm.com>
Signed-off-by: default avatarKent Yoder <key@linux.vnet.ibm.com>
parent 4a727429

drivers/char/tpm/Makefile

+5 −0
Original line number Diff line number Diff line
@@ -5,6 +5,11 @@ obj-$(CONFIG_TCG_TPM) += tpm.o 
ifdef CONFIG_ACPI

	obj-$(CONFIG_TCG_TPM) += tpm_bios.o

	tpm_bios-objs += tpm_eventlog.o tpm_acpi.o

else

ifdef CONFIG_TCG_IBMVTPM

	obj-$(CONFIG_TCG_TPM) += tpm_bios.o

	tpm_bios-objs += tpm_eventlog.o tpm_of.o

endif

endif

obj-$(CONFIG_TCG_TIS) += tpm_tis.o

obj-$(CONFIG_TCG_TIS_I2C_INFINEON) += tpm_i2c_infineon.o

drivers/char/tpm/tpm.h

+0 −12
Original line number Diff line number Diff line
@@ -327,15 +327,3 @@ extern int tpm_pm_suspend(struct device *); 
extern int tpm_pm_resume(struct device *);

extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,

			     wait_queue_head_t *);
 
#ifdef CONFIG_ACPI

extern struct dentry ** tpm_bios_log_setup(char *);

extern void tpm_bios_log_teardown(struct dentry **);

#else

static inline struct dentry ** tpm_bios_log_setup(char *name)

{

	return NULL;

}

static inline void tpm_bios_log_teardown(struct dentry **dir)

{

}

#endif

drivers/char/tpm/tpm_eventlog.h

+15 −0
Original line number Diff line number Diff line
@@ -68,4 +68,19 @@ enum tcpa_pc_event_ids { 
};



int read_log(struct tpm_bios_log *log);



#if defined(CONFIG_TCG_IBMVTPM) || defined(CONFIG_TCG_IBMVTPM_MODULE) || \

	defined(CONFIG_ACPI)

extern struct dentry **tpm_bios_log_setup(char *);

extern void tpm_bios_log_teardown(struct dentry **);

#else

static inline struct dentry **tpm_bios_log_setup(char *name)

{

	return NULL;

}

static inline void tpm_bios_log_teardown(struct dentry **dir)

{

}

#endif



#endif

drivers/char/tpm/tpm_of.c

0 → 100644
+73 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2012 IBM Corporation

 *

 * Author: Ashley Lai <adlai@us.ibm.com>

 *

 * Maintained by: <tpmdd-devel@lists.sourceforge.net>

 *

 * Read the event log created by the firmware on PPC64

 *

 * 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 <linux/slab.h>

#include <linux/of.h>



#include "tpm.h"

#include "tpm_eventlog.h"



int read_log(struct tpm_bios_log *log)

{

	struct device_node *np;

	const u32 *sizep;

	const __be64 *basep;



	if (log->bios_event_log != NULL) {

		pr_err("%s: ERROR - Eventlog already initialized\n", __func__);

		return -EFAULT;

	}



	np = of_find_node_by_name(NULL, "ibm,vtpm");

	if (!np) {

		pr_err("%s: ERROR - IBMVTPM not supported\n", __func__);

		return -ENODEV;

	}



	sizep = of_get_property(np, "linux,sml-size", NULL);

	if (sizep == NULL) {

		pr_err("%s: ERROR - SML size not found\n", __func__);

		goto cleanup_eio;

	}

	if (*sizep == 0) {

		pr_err("%s: ERROR - event log area empty\n", __func__);

		goto cleanup_eio;

	}



	basep = of_get_property(np, "linux,sml-base", NULL);

	if (basep == NULL) {

		pr_err(KERN_ERR "%s: ERROR - SML not found\n", __func__);

		goto cleanup_eio;

	}



	of_node_put(np);

	log->bios_event_log = kmalloc(*sizep, GFP_KERNEL);

	if (!log->bios_event_log) {

		pr_err("%s: ERROR - Not enough memory for BIOS measurements\n",

		       __func__);

		return -ENOMEM;

	}



	log->bios_event_log_end = log->bios_event_log + *sizep;



	memcpy(log->bios_event_log, __va(be64_to_cpup(basep)), *sizep);



	return 0;



cleanup_eio:

	of_node_put(np);

	return -EIO;

}