security/integrity/ima/ima_kexec.c

/*
 * Copyright (C) 2016 IBM Corporation
 *
 * Authors:
 * Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
 * Mimi Zohar <zohar@linux.vnet.ibm.com>
 *
 * 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 "ima.h"

/*
 * Restore the measurement list from the previous kernel.
 */
void ima_load_kexec_buffer(void)
{
	void *kexec_buffer = NULL;
	size_t kexec_buffer_size = 0;
	int rc;

	rc = ima_get_kexec_buffer(&kexec_buffer, &kexec_buffer_size);
	switch (rc) {
	case 0:
		rc = ima_restore_measurement_list(kexec_buffer_size,
						  kexec_buffer);
		if (rc != 0)
			pr_err("Failed to restore the measurement list: %d\n",
				rc);

		ima_free_kexec_buffer();
		break;
	case -ENOTSUPP:
		pr_debug("Restoring the measurement list not supported\n");
		break;
	case -ENOENT:
		pr_debug("No measurement list to restore\n");
		break;
	default:
		pr_debug("Error restoring the measurement list: %d\n", rc);
	}
}