mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-08-09 06:14:34 +02:00
Benjamin MarzinskiandMikulas Patocka
2ac3de0bbf
It is possible that the dm_ima_measure_on_* functions run at the same time as a table is getting swapped, but before the md->ima.active_table is updated by dm_ima_measure_on_device_resume(). Instead of using the current device size, use the size of the active table that is being measured (assuming there is one), so the information is consistent. Also, don't allocate a separate string to hold the capactiy. Just print it directly to the measurement buffer. Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com> Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
119 lines
3.8 KiB
C
119 lines
3.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2021 Microsoft Corporation
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*
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* Author: Tushar Sugandhi <tusharsu@linux.microsoft.com>
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*
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* Header file for device mapper IMA measurements.
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*/
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#ifndef DM_IMA_H
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#define DM_IMA_H
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#define DM_IMA_MEASUREMENT_BUF_LEN 4096
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#define DM_IMA_DEVICE_BUF_LEN 1024
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#define DM_IMA_TARGET_METADATA_BUF_LEN 128
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#define DM_IMA_TARGET_DATA_BUF_LEN 2048
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#define DM_IMA_DEVICE_CAPACITY_BUF_LEN 128
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#define __dm_ima_stringify(s) #s
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#define __dm_ima_str(s) __dm_ima_stringify(s)
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#define DM_IMA_VERSION_STR "dm_version=" \
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__dm_ima_str(DM_VERSION_MAJOR) "." \
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__dm_ima_str(DM_VERSION_MINOR) "." \
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__dm_ima_str(DM_VERSION_PATCHLEVEL) ";"
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enum dm_ima_table_op {
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DM_IMA_TABLE_SAVE,
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DM_IMA_TABLE_RESTORE,
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};
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#ifdef CONFIG_IMA
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struct dm_ima_device_table_metadata {
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/*
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* Contains data specific to the device which is common across
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* all the targets in the table (e.g. name, uuid, major, minor, etc).
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* The values are stored in comma separated list of key1=val1,key2=val2;
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* pairs delimited by a semicolon at the end of the list.
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*/
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char *device_metadata;
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unsigned int device_metadata_len;
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unsigned int num_targets;
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sector_t capacity;
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/*
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* Contains the sha256 hashes of the IMA measurements of the target
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* attributes' key-value pairs from the active/inactive tables.
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*/
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char *hash;
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unsigned int hash_len;
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};
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struct dm_ima_context {
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struct dm_ima_device_table_metadata table;
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unsigned int update_idx;
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char dev_name[DM_NAME_LEN*2];
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char dev_uuid[DM_UUID_LEN*2];
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};
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/*
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* This structure contains device metadata, and table hash for
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* active and inactive tables for ima measurements.
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*/
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struct dm_ima_measurements {
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unsigned int update_idx;
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unsigned int measure_idx;
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struct wait_queue_head ima_wq;
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spinlock_t ima_lock;
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struct dm_ima_device_table_metadata active_table;
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struct dm_ima_device_table_metadata inactive_table;
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};
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void dm_ima_init(struct mapped_device *md);
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void dm_ima_alloc_context(struct dm_ima_context **context, bool noio);
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void dm_ima_free_context(struct dm_ima_context *context);
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void dm_ima_context_table_op(struct mapped_device *md,
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struct dm_ima_context *context,
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enum dm_ima_table_op op);
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void dm_ima_measure_on_table_load(struct dm_table *table,
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struct dm_ima_context *context);
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void dm_ima_measure_on_device_resume(struct mapped_device *md, bool swap,
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struct dm_ima_context *context);
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void dm_ima_measure_on_device_remove(struct mapped_device *md, bool remove_all,
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struct dm_ima_context *context,
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unsigned int idx);
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void dm_ima_measure_on_table_clear(struct mapped_device *md,
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struct dm_ima_context *context);
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void dm_ima_measure_on_device_rename(struct mapped_device *md,
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struct dm_ima_context *context);
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#else
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struct dm_ima_context;
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static inline void dm_ima_init(struct mapped_device *md) {}
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static inline void dm_ima_alloc_context(struct dm_ima_context **context, bool noio) {}
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static inline void dm_ima_free_context(struct dm_ima_context *context) {}
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static inline void dm_ima_context_table_op(struct mapped_device *md,
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struct dm_ima_context *context,
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enum dm_ima_table_op op) {}
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static inline void dm_ima_measure_on_table_load(struct dm_table *table,
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struct dm_ima_context *context) {}
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static inline void dm_ima_measure_on_device_resume(struct mapped_device *md,
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bool swap,
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struct dm_ima_context *context) {}
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static inline void dm_ima_measure_on_device_remove(struct mapped_device *md,
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bool remove_all,
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struct dm_ima_context *context,
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unsigned int idx) {}
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static inline void dm_ima_measure_on_table_clear(struct mapped_device *md,
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struct dm_ima_context *context) {}
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static inline void dm_ima_measure_on_device_rename(struct mapped_device *md,
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struct dm_ima_context *context) {}
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#endif /* CONFIG_IMA */
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#endif /* DM_IMA_H */
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