cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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dm-ima.h (2660B)


      1/* SPDX-License-Identifier: GPL-2.0
      2 *
      3 * Copyright (C) 2021 Microsoft Corporation
      4 *
      5 * Author: Tushar Sugandhi <tusharsu@linux.microsoft.com>
      6 *
      7 * File: dm-ima.h
      8 *       Header file for device mapper IMA measurements.
      9 */
     10
     11#ifndef DM_IMA_H
     12#define DM_IMA_H
     13
     14#define DM_IMA_MEASUREMENT_BUF_LEN	4096
     15#define DM_IMA_DEVICE_BUF_LEN		1024
     16#define DM_IMA_TARGET_METADATA_BUF_LEN	128
     17#define DM_IMA_TARGET_DATA_BUF_LEN	2048
     18#define DM_IMA_DEVICE_CAPACITY_BUF_LEN	128
     19#define DM_IMA_TABLE_HASH_ALG		"sha256"
     20
     21#define __dm_ima_stringify(s) #s
     22#define __dm_ima_str(s) __dm_ima_stringify(s)
     23
     24#define DM_IMA_VERSION_STR "dm_version="	\
     25	__dm_ima_str(DM_VERSION_MAJOR) "."	\
     26	__dm_ima_str(DM_VERSION_MINOR) "."	\
     27	__dm_ima_str(DM_VERSION_PATCHLEVEL) ";"
     28
     29#ifdef CONFIG_IMA
     30
     31struct dm_ima_device_table_metadata {
     32	/*
     33	 * Contains data specific to the device which is common across
     34	 * all the targets in the table (e.g. name, uuid, major, minor, etc).
     35	 * The values are stored in comma separated list of key1=val1,key2=val2;
     36	 * pairs delimited by a semicolon at the end of the list.
     37	 */
     38	char *device_metadata;
     39	unsigned int device_metadata_len;
     40	unsigned int num_targets;
     41
     42	/*
     43	 * Contains the sha256 hashes of the IMA measurements of the target
     44	 * attributes' key-value pairs from the active/inactive tables.
     45	 */
     46	char *hash;
     47	unsigned int hash_len;
     48};
     49
     50/*
     51 * This structure contains device metadata, and table hash for
     52 * active and inactive tables for ima measurements.
     53 */
     54struct dm_ima_measurements {
     55	struct dm_ima_device_table_metadata active_table;
     56	struct dm_ima_device_table_metadata inactive_table;
     57	unsigned int dm_version_str_len;
     58};
     59
     60void dm_ima_reset_data(struct mapped_device *md);
     61void dm_ima_measure_on_table_load(struct dm_table *table, unsigned int status_flags);
     62void dm_ima_measure_on_device_resume(struct mapped_device *md, bool swap);
     63void dm_ima_measure_on_device_remove(struct mapped_device *md, bool remove_all);
     64void dm_ima_measure_on_table_clear(struct mapped_device *md, bool new_map);
     65void dm_ima_measure_on_device_rename(struct mapped_device *md);
     66
     67#else
     68
     69static inline void dm_ima_reset_data(struct mapped_device *md) {}
     70static inline void dm_ima_measure_on_table_load(struct dm_table *table, unsigned int status_flags) {}
     71static inline void dm_ima_measure_on_device_resume(struct mapped_device *md, bool swap) {}
     72static inline void dm_ima_measure_on_device_remove(struct mapped_device *md, bool remove_all) {}
     73static inline void dm_ima_measure_on_table_clear(struct mapped_device *md, bool new_map) {}
     74static inline void dm_ima_measure_on_device_rename(struct mapped_device *md) {}
     75
     76#endif /* CONFIG_IMA */
     77
     78#endif /* DM_IMA_H */