753 lines
21 KiB
C
753 lines
21 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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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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* File: dm-ima.c
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* Enables IMA measurements for DM targets
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*/
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#include "dm-core.h"
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#include "dm-ima.h"
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#include <linux/ima.h>
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#include <linux/sched/mm.h>
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#include <crypto/hash.h>
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#include <linux/crypto.h>
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#include <crypto/hash_info.h>
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#define DM_MSG_PREFIX "ima"
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/*
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* Internal function to prefix separator characters in input buffer with escape
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* character, so that they don't interfere with the construction of key-value pairs,
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* and clients can split the key1=val1,key2=val2,key3=val3; pairs properly.
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*/
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static void fix_separator_chars(char **buf)
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{
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int l = strlen(*buf);
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int i, j, sp = 0;
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for (i = 0; i < l; i++)
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if ((*buf)[i] == '\\' || (*buf)[i] == ';' || (*buf)[i] == '=' || (*buf)[i] == ',')
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sp++;
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if (!sp)
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return;
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for (i = l-1, j = i+sp; i >= 0; i--) {
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(*buf)[j--] = (*buf)[i];
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if ((*buf)[i] == '\\' || (*buf)[i] == ';' || (*buf)[i] == '=' || (*buf)[i] == ',')
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(*buf)[j--] = '\\';
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}
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}
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/*
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* Internal function to allocate memory for IMA measurements.
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*/
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static void *dm_ima_alloc(size_t len, gfp_t flags, bool noio)
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{
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unsigned int noio_flag;
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void *ptr;
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if (noio)
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noio_flag = memalloc_noio_save();
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ptr = kzalloc(len, flags);
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if (noio)
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memalloc_noio_restore(noio_flag);
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return ptr;
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}
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/*
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* Internal function to allocate and copy name and uuid for IMA measurements.
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*/
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static int dm_ima_alloc_and_copy_name_uuid(struct mapped_device *md, char **dev_name,
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char **dev_uuid, bool noio)
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{
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int r;
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*dev_name = dm_ima_alloc(DM_NAME_LEN*2, GFP_KERNEL, noio);
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if (!(*dev_name)) {
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r = -ENOMEM;
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goto error;
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}
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*dev_uuid = dm_ima_alloc(DM_UUID_LEN*2, GFP_KERNEL, noio);
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if (!(*dev_uuid)) {
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r = -ENOMEM;
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goto error;
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}
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r = dm_copy_name_and_uuid(md, *dev_name, *dev_uuid);
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if (r)
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goto error;
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fix_separator_chars(dev_name);
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fix_separator_chars(dev_uuid);
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return 0;
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error:
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kfree(*dev_name);
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kfree(*dev_uuid);
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*dev_name = NULL;
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*dev_uuid = NULL;
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return r;
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}
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/*
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* Internal function to allocate and copy device data for IMA measurements.
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*/
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static int dm_ima_alloc_and_copy_device_data(struct mapped_device *md, char **device_data,
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unsigned int num_targets, bool noio)
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{
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char *dev_name = NULL, *dev_uuid = NULL;
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int r;
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r = dm_ima_alloc_and_copy_name_uuid(md, &dev_name, &dev_uuid, noio);
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if (r)
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return r;
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*device_data = dm_ima_alloc(DM_IMA_DEVICE_BUF_LEN, GFP_KERNEL, noio);
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if (!(*device_data)) {
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r = -ENOMEM;
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goto error;
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}
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scnprintf(*device_data, DM_IMA_DEVICE_BUF_LEN,
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"name=%s,uuid=%s,major=%d,minor=%d,minor_count=%d,num_targets=%u;",
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dev_name, dev_uuid, md->disk->major, md->disk->first_minor,
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md->disk->minors, num_targets);
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error:
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kfree(dev_name);
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kfree(dev_uuid);
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return r;
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}
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/*
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* Internal wrapper function to call IMA to measure DM data.
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*/
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static void dm_ima_measure_data(const char *event_name, const void *buf, size_t buf_len,
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bool noio)
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{
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unsigned int noio_flag;
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if (noio)
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noio_flag = memalloc_noio_save();
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ima_measure_critical_data(DM_NAME, event_name, buf, buf_len,
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false, NULL, 0);
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if (noio)
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memalloc_noio_restore(noio_flag);
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}
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/*
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* Internal function to allocate and copy current device capacity for IMA measurements.
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*/
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static int dm_ima_alloc_and_copy_capacity_str(struct mapped_device *md, char **capacity_str,
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bool noio)
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{
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sector_t capacity;
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capacity = get_capacity(md->disk);
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*capacity_str = dm_ima_alloc(DM_IMA_DEVICE_CAPACITY_BUF_LEN, GFP_KERNEL, noio);
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if (!(*capacity_str))
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return -ENOMEM;
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scnprintf(*capacity_str, DM_IMA_DEVICE_BUF_LEN, "current_device_capacity=%llu;",
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capacity);
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return 0;
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}
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/*
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* Initialize/reset the dm ima related data structure variables.
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*/
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void dm_ima_reset_data(struct mapped_device *md)
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{
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memset(&(md->ima), 0, sizeof(md->ima));
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md->ima.dm_version_str_len = strlen(DM_IMA_VERSION_STR);
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}
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/*
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* Build up the IMA data for each target, and finally measure.
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*/
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void dm_ima_measure_on_table_load(struct dm_table *table, unsigned int status_flags)
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{
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size_t device_data_buf_len, target_metadata_buf_len, target_data_buf_len, l = 0;
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char *target_metadata_buf = NULL, *target_data_buf = NULL, *digest_buf = NULL;
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char *ima_buf = NULL, *device_data_buf = NULL;
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int digest_size, last_target_measured = -1, r;
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status_type_t type = STATUSTYPE_IMA;
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size_t cur_total_buf_len = 0;
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unsigned int num_targets, i;
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SHASH_DESC_ON_STACK(shash, NULL);
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struct crypto_shash *tfm = NULL;
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u8 *digest = NULL;
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bool noio = false;
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/*
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* In below hash_alg_prefix_len assignment +1 is for the additional char (':'),
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* when prefixing the hash value with the hash algorithm name. e.g. sha256:<hash_value>.
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*/
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const size_t hash_alg_prefix_len = strlen(DM_IMA_TABLE_HASH_ALG) + 1;
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char table_load_event_name[] = "dm_table_load";
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ima_buf = dm_ima_alloc(DM_IMA_MEASUREMENT_BUF_LEN, GFP_KERNEL, noio);
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if (!ima_buf)
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return;
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target_metadata_buf = dm_ima_alloc(DM_IMA_TARGET_METADATA_BUF_LEN, GFP_KERNEL, noio);
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if (!target_metadata_buf)
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goto error;
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target_data_buf = dm_ima_alloc(DM_IMA_TARGET_DATA_BUF_LEN, GFP_KERNEL, noio);
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if (!target_data_buf)
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goto error;
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num_targets = dm_table_get_num_targets(table);
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if (dm_ima_alloc_and_copy_device_data(table->md, &device_data_buf, num_targets, noio))
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goto error;
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tfm = crypto_alloc_shash(DM_IMA_TABLE_HASH_ALG, 0, 0);
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if (IS_ERR(tfm))
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goto error;
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shash->tfm = tfm;
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digest_size = crypto_shash_digestsize(tfm);
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digest = dm_ima_alloc(digest_size, GFP_KERNEL, noio);
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if (!digest)
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goto error;
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r = crypto_shash_init(shash);
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if (r)
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goto error;
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memcpy(ima_buf + l, DM_IMA_VERSION_STR, table->md->ima.dm_version_str_len);
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l += table->md->ima.dm_version_str_len;
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device_data_buf_len = strlen(device_data_buf);
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memcpy(ima_buf + l, device_data_buf, device_data_buf_len);
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l += device_data_buf_len;
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for (i = 0; i < num_targets; i++) {
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struct dm_target *ti = dm_table_get_target(table, i);
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if (!ti)
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goto error;
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last_target_measured = 0;
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/*
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* First retrieve the target metadata.
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*/
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scnprintf(target_metadata_buf, DM_IMA_TARGET_METADATA_BUF_LEN,
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"target_index=%d,target_begin=%llu,target_len=%llu,",
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i, ti->begin, ti->len);
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target_metadata_buf_len = strlen(target_metadata_buf);
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/*
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* Then retrieve the actual target data.
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*/
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if (ti->type->status)
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ti->type->status(ti, type, status_flags, target_data_buf,
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DM_IMA_TARGET_DATA_BUF_LEN);
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else
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target_data_buf[0] = '\0';
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target_data_buf_len = strlen(target_data_buf);
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/*
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* Check if the total data can fit into the IMA buffer.
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*/
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cur_total_buf_len = l + target_metadata_buf_len + target_data_buf_len;
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/*
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* IMA measurements for DM targets are best-effort.
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* If the total data buffered so far, including the current target,
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* is too large to fit into DM_IMA_MEASUREMENT_BUF_LEN, measure what
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* we have in the current buffer, and continue measuring the remaining
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* targets by prefixing the device metadata again.
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*/
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if (unlikely(cur_total_buf_len >= DM_IMA_MEASUREMENT_BUF_LEN)) {
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dm_ima_measure_data(table_load_event_name, ima_buf, l, noio);
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r = crypto_shash_update(shash, (const u8 *)ima_buf, l);
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if (r < 0)
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goto error;
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memset(ima_buf, 0, DM_IMA_MEASUREMENT_BUF_LEN);
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l = 0;
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/*
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* Each new "dm_table_load" entry in IMA log should have device data
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* prefix, so that multiple records from the same "dm_table_load" for
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* a given device can be linked together.
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*/
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memcpy(ima_buf + l, DM_IMA_VERSION_STR, table->md->ima.dm_version_str_len);
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l += table->md->ima.dm_version_str_len;
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memcpy(ima_buf + l, device_data_buf, device_data_buf_len);
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l += device_data_buf_len;
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/*
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* If this iteration of the for loop turns out to be the last target
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* in the table, dm_ima_measure_data("dm_table_load", ...) doesn't need
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* to be called again, just the hash needs to be finalized.
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* "last_target_measured" tracks this state.
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*/
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last_target_measured = 1;
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}
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/*
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* Fill-in all the target metadata, so that multiple targets for the same
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* device can be linked together.
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*/
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memcpy(ima_buf + l, target_metadata_buf, target_metadata_buf_len);
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l += target_metadata_buf_len;
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memcpy(ima_buf + l, target_data_buf, target_data_buf_len);
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l += target_data_buf_len;
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}
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if (!last_target_measured) {
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dm_ima_measure_data(table_load_event_name, ima_buf, l, noio);
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r = crypto_shash_update(shash, (const u8 *)ima_buf, l);
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if (r < 0)
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goto error;
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}
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/*
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* Finalize the table hash, and store it in table->md->ima.inactive_table.hash,
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* so that the table data can be verified against the future device state change
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* events, e.g. resume, rename, remove, table-clear etc.
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*/
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r = crypto_shash_final(shash, digest);
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if (r < 0)
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goto error;
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digest_buf = dm_ima_alloc((digest_size*2) + hash_alg_prefix_len + 1, GFP_KERNEL, noio);
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if (!digest_buf)
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goto error;
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snprintf(digest_buf, hash_alg_prefix_len + 1, "%s:", DM_IMA_TABLE_HASH_ALG);
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for (i = 0; i < digest_size; i++)
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snprintf((digest_buf + hash_alg_prefix_len + (i*2)), 3, "%02x", digest[i]);
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if (table->md->ima.active_table.hash != table->md->ima.inactive_table.hash)
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kfree(table->md->ima.inactive_table.hash);
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table->md->ima.inactive_table.hash = digest_buf;
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table->md->ima.inactive_table.hash_len = strlen(digest_buf);
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table->md->ima.inactive_table.num_targets = num_targets;
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if (table->md->ima.active_table.device_metadata !=
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table->md->ima.inactive_table.device_metadata)
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kfree(table->md->ima.inactive_table.device_metadata);
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table->md->ima.inactive_table.device_metadata = device_data_buf;
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table->md->ima.inactive_table.device_metadata_len = device_data_buf_len;
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goto exit;
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error:
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kfree(digest_buf);
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kfree(device_data_buf);
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exit:
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kfree(digest);
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if (tfm)
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crypto_free_shash(tfm);
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kfree(ima_buf);
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kfree(target_metadata_buf);
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kfree(target_data_buf);
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}
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/*
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* Measure IMA data on device resume.
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*/
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void dm_ima_measure_on_device_resume(struct mapped_device *md, bool swap)
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{
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char *device_table_data, *dev_name = NULL, *dev_uuid = NULL, *capacity_str = NULL;
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char active[] = "active_table_hash=";
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unsigned int active_len = strlen(active), capacity_len = 0;
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unsigned int l = 0;
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bool noio = true;
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bool nodata = true;
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int r;
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device_table_data = dm_ima_alloc(DM_IMA_DEVICE_BUF_LEN, GFP_KERNEL, noio);
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if (!device_table_data)
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return;
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r = dm_ima_alloc_and_copy_capacity_str(md, &capacity_str, noio);
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if (r)
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goto error;
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memcpy(device_table_data + l, DM_IMA_VERSION_STR, md->ima.dm_version_str_len);
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l += md->ima.dm_version_str_len;
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if (swap) {
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if (md->ima.active_table.hash != md->ima.inactive_table.hash)
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kfree(md->ima.active_table.hash);
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md->ima.active_table.hash = NULL;
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md->ima.active_table.hash_len = 0;
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if (md->ima.active_table.device_metadata !=
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md->ima.inactive_table.device_metadata)
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kfree(md->ima.active_table.device_metadata);
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md->ima.active_table.device_metadata = NULL;
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md->ima.active_table.device_metadata_len = 0;
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md->ima.active_table.num_targets = 0;
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if (md->ima.inactive_table.hash) {
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md->ima.active_table.hash = md->ima.inactive_table.hash;
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md->ima.active_table.hash_len = md->ima.inactive_table.hash_len;
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md->ima.inactive_table.hash = NULL;
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md->ima.inactive_table.hash_len = 0;
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}
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||
|
if (md->ima.inactive_table.device_metadata) {
|
||
|
md->ima.active_table.device_metadata =
|
||
|
md->ima.inactive_table.device_metadata;
|
||
|
md->ima.active_table.device_metadata_len =
|
||
|
md->ima.inactive_table.device_metadata_len;
|
||
|
md->ima.active_table.num_targets = md->ima.inactive_table.num_targets;
|
||
|
md->ima.inactive_table.device_metadata = NULL;
|
||
|
md->ima.inactive_table.device_metadata_len = 0;
|
||
|
md->ima.inactive_table.num_targets = 0;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (md->ima.active_table.device_metadata) {
|
||
|
memcpy(device_table_data + l, md->ima.active_table.device_metadata,
|
||
|
md->ima.active_table.device_metadata_len);
|
||
|
l += md->ima.active_table.device_metadata_len;
|
||
|
|
||
|
nodata = false;
|
||
|
}
|
||
|
|
||
|
if (md->ima.active_table.hash) {
|
||
|
memcpy(device_table_data + l, active, active_len);
|
||
|
l += active_len;
|
||
|
|
||
|
memcpy(device_table_data + l, md->ima.active_table.hash,
|
||
|
md->ima.active_table.hash_len);
|
||
|
l += md->ima.active_table.hash_len;
|
||
|
|
||
|
memcpy(device_table_data + l, ";", 1);
|
||
|
l++;
|
||
|
|
||
|
nodata = false;
|
||
|
}
|
||
|
|
||
|
if (nodata) {
|
||
|
r = dm_ima_alloc_and_copy_name_uuid(md, &dev_name, &dev_uuid, noio);
|
||
|
if (r)
|
||
|
goto error;
|
||
|
|
||
|
scnprintf(device_table_data, DM_IMA_DEVICE_BUF_LEN,
|
||
|
"%sname=%s,uuid=%s;device_resume=no_data;",
|
||
|
DM_IMA_VERSION_STR, dev_name, dev_uuid);
|
||
|
l = strlen(device_table_data);
|
||
|
|
||
|
}
|
||
|
|
||
|
capacity_len = strlen(capacity_str);
|
||
|
memcpy(device_table_data + l, capacity_str, capacity_len);
|
||
|
l += capacity_len;
|
||
|
|
||
|
dm_ima_measure_data("dm_device_resume", device_table_data, l, noio);
|
||
|
|
||
|
kfree(dev_name);
|
||
|
kfree(dev_uuid);
|
||
|
error:
|
||
|
kfree(capacity_str);
|
||
|
kfree(device_table_data);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Measure IMA data on remove.
|
||
|
*/
|
||
|
void dm_ima_measure_on_device_remove(struct mapped_device *md, bool remove_all)
|
||
|
{
|
||
|
char *device_table_data, *dev_name = NULL, *dev_uuid = NULL, *capacity_str = NULL;
|
||
|
char active_table_str[] = "active_table_hash=";
|
||
|
char inactive_table_str[] = "inactive_table_hash=";
|
||
|
char device_active_str[] = "device_active_metadata=";
|
||
|
char device_inactive_str[] = "device_inactive_metadata=";
|
||
|
char remove_all_str[] = "remove_all=";
|
||
|
unsigned int active_table_len = strlen(active_table_str);
|
||
|
unsigned int inactive_table_len = strlen(inactive_table_str);
|
||
|
unsigned int device_active_len = strlen(device_active_str);
|
||
|
unsigned int device_inactive_len = strlen(device_inactive_str);
|
||
|
unsigned int remove_all_len = strlen(remove_all_str);
|
||
|
unsigned int capacity_len = 0;
|
||
|
unsigned int l = 0;
|
||
|
bool noio = true;
|
||
|
bool nodata = true;
|
||
|
int r;
|
||
|
|
||
|
device_table_data = dm_ima_alloc(DM_IMA_DEVICE_BUF_LEN*2, GFP_KERNEL, noio);
|
||
|
if (!device_table_data)
|
||
|
goto exit;
|
||
|
|
||
|
r = dm_ima_alloc_and_copy_capacity_str(md, &capacity_str, noio);
|
||
|
if (r) {
|
||
|
kfree(device_table_data);
|
||
|
goto exit;
|
||
|
}
|
||
|
|
||
|
memcpy(device_table_data + l, DM_IMA_VERSION_STR, md->ima.dm_version_str_len);
|
||
|
l += md->ima.dm_version_str_len;
|
||
|
|
||
|
if (md->ima.active_table.device_metadata) {
|
||
|
memcpy(device_table_data + l, device_active_str, device_active_len);
|
||
|
l += device_active_len;
|
||
|
|
||
|
memcpy(device_table_data + l, md->ima.active_table.device_metadata,
|
||
|
md->ima.active_table.device_metadata_len);
|
||
|
l += md->ima.active_table.device_metadata_len;
|
||
|
|
||
|
nodata = false;
|
||
|
}
|
||
|
|
||
|
if (md->ima.inactive_table.device_metadata) {
|
||
|
memcpy(device_table_data + l, device_inactive_str, device_inactive_len);
|
||
|
l += device_inactive_len;
|
||
|
|
||
|
memcpy(device_table_data + l, md->ima.inactive_table.device_metadata,
|
||
|
md->ima.inactive_table.device_metadata_len);
|
||
|
l += md->ima.inactive_table.device_metadata_len;
|
||
|
|
||
|
nodata = false;
|
||
|
}
|
||
|
|
||
|
if (md->ima.active_table.hash) {
|
||
|
memcpy(device_table_data + l, active_table_str, active_table_len);
|
||
|
l += active_table_len;
|
||
|
|
||
|
memcpy(device_table_data + l, md->ima.active_table.hash,
|
||
|
md->ima.active_table.hash_len);
|
||
|
l += md->ima.active_table.hash_len;
|
||
|
|
||
|
memcpy(device_table_data + l, ",", 1);
|
||
|
l++;
|
||
|
|
||
|
nodata = false;
|
||
|
}
|
||
|
|
||
|
if (md->ima.inactive_table.hash) {
|
||
|
memcpy(device_table_data + l, inactive_table_str, inactive_table_len);
|
||
|
l += inactive_table_len;
|
||
|
|
||
|
memcpy(device_table_data + l, md->ima.inactive_table.hash,
|
||
|
md->ima.inactive_table.hash_len);
|
||
|
l += md->ima.inactive_table.hash_len;
|
||
|
|
||
|
memcpy(device_table_data + l, ",", 1);
|
||
|
l++;
|
||
|
|
||
|
nodata = false;
|
||
|
}
|
||
|
/*
|
||
|
* In case both active and inactive tables, and corresponding
|
||
|
* device metadata is cleared/missing - record the name and uuid
|
||
|
* in IMA measurements.
|
||
|
*/
|
||
|
if (nodata) {
|
||
|
if (dm_ima_alloc_and_copy_name_uuid(md, &dev_name, &dev_uuid, noio))
|
||
|
goto error;
|
||
|
|
||
|
scnprintf(device_table_data, DM_IMA_DEVICE_BUF_LEN,
|
||
|
"%sname=%s,uuid=%s;device_remove=no_data;",
|
||
|
DM_IMA_VERSION_STR, dev_name, dev_uuid);
|
||
|
l = strlen(device_table_data);
|
||
|
}
|
||
|
|
||
|
memcpy(device_table_data + l, remove_all_str, remove_all_len);
|
||
|
l += remove_all_len;
|
||
|
memcpy(device_table_data + l, remove_all ? "y;" : "n;", 2);
|
||
|
l += 2;
|
||
|
|
||
|
capacity_len = strlen(capacity_str);
|
||
|
memcpy(device_table_data + l, capacity_str, capacity_len);
|
||
|
l += capacity_len;
|
||
|
|
||
|
dm_ima_measure_data("dm_device_remove", device_table_data, l, noio);
|
||
|
|
||
|
error:
|
||
|
kfree(device_table_data);
|
||
|
kfree(capacity_str);
|
||
|
exit:
|
||
|
kfree(md->ima.active_table.device_metadata);
|
||
|
|
||
|
if (md->ima.active_table.device_metadata !=
|
||
|
md->ima.inactive_table.device_metadata)
|
||
|
kfree(md->ima.inactive_table.device_metadata);
|
||
|
|
||
|
kfree(md->ima.active_table.hash);
|
||
|
|
||
|
if (md->ima.active_table.hash != md->ima.inactive_table.hash)
|
||
|
kfree(md->ima.inactive_table.hash);
|
||
|
|
||
|
dm_ima_reset_data(md);
|
||
|
|
||
|
kfree(dev_name);
|
||
|
kfree(dev_uuid);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Measure ima data on table clear.
|
||
|
*/
|
||
|
void dm_ima_measure_on_table_clear(struct mapped_device *md, bool new_map)
|
||
|
{
|
||
|
unsigned int l = 0, capacity_len = 0;
|
||
|
char *device_table_data = NULL, *dev_name = NULL, *dev_uuid = NULL, *capacity_str = NULL;
|
||
|
char inactive_str[] = "inactive_table_hash=";
|
||
|
unsigned int inactive_len = strlen(inactive_str);
|
||
|
bool noio = true;
|
||
|
bool nodata = true;
|
||
|
int r;
|
||
|
|
||
|
device_table_data = dm_ima_alloc(DM_IMA_DEVICE_BUF_LEN, GFP_KERNEL, noio);
|
||
|
if (!device_table_data)
|
||
|
return;
|
||
|
|
||
|
r = dm_ima_alloc_and_copy_capacity_str(md, &capacity_str, noio);
|
||
|
if (r)
|
||
|
goto error1;
|
||
|
|
||
|
memcpy(device_table_data + l, DM_IMA_VERSION_STR, md->ima.dm_version_str_len);
|
||
|
l += md->ima.dm_version_str_len;
|
||
|
|
||
|
if (md->ima.inactive_table.device_metadata_len &&
|
||
|
md->ima.inactive_table.hash_len) {
|
||
|
memcpy(device_table_data + l, md->ima.inactive_table.device_metadata,
|
||
|
md->ima.inactive_table.device_metadata_len);
|
||
|
l += md->ima.inactive_table.device_metadata_len;
|
||
|
|
||
|
memcpy(device_table_data + l, inactive_str, inactive_len);
|
||
|
l += inactive_len;
|
||
|
|
||
|
memcpy(device_table_data + l, md->ima.inactive_table.hash,
|
||
|
md->ima.inactive_table.hash_len);
|
||
|
|
||
|
l += md->ima.inactive_table.hash_len;
|
||
|
|
||
|
memcpy(device_table_data + l, ";", 1);
|
||
|
l++;
|
||
|
|
||
|
nodata = false;
|
||
|
}
|
||
|
|
||
|
if (nodata) {
|
||
|
if (dm_ima_alloc_and_copy_name_uuid(md, &dev_name, &dev_uuid, noio))
|
||
|
goto error2;
|
||
|
|
||
|
scnprintf(device_table_data, DM_IMA_DEVICE_BUF_LEN,
|
||
|
"%sname=%s,uuid=%s;table_clear=no_data;",
|
||
|
DM_IMA_VERSION_STR, dev_name, dev_uuid);
|
||
|
l = strlen(device_table_data);
|
||
|
}
|
||
|
|
||
|
capacity_len = strlen(capacity_str);
|
||
|
memcpy(device_table_data + l, capacity_str, capacity_len);
|
||
|
l += capacity_len;
|
||
|
|
||
|
dm_ima_measure_data("dm_table_clear", device_table_data, l, noio);
|
||
|
|
||
|
if (new_map) {
|
||
|
if (md->ima.inactive_table.hash &&
|
||
|
md->ima.inactive_table.hash != md->ima.active_table.hash)
|
||
|
kfree(md->ima.inactive_table.hash);
|
||
|
|
||
|
md->ima.inactive_table.hash = NULL;
|
||
|
md->ima.inactive_table.hash_len = 0;
|
||
|
|
||
|
if (md->ima.inactive_table.device_metadata &&
|
||
|
md->ima.inactive_table.device_metadata != md->ima.active_table.device_metadata)
|
||
|
kfree(md->ima.inactive_table.device_metadata);
|
||
|
|
||
|
md->ima.inactive_table.device_metadata = NULL;
|
||
|
md->ima.inactive_table.device_metadata_len = 0;
|
||
|
md->ima.inactive_table.num_targets = 0;
|
||
|
|
||
|
if (md->ima.active_table.hash) {
|
||
|
md->ima.inactive_table.hash = md->ima.active_table.hash;
|
||
|
md->ima.inactive_table.hash_len = md->ima.active_table.hash_len;
|
||
|
}
|
||
|
|
||
|
if (md->ima.active_table.device_metadata) {
|
||
|
md->ima.inactive_table.device_metadata =
|
||
|
md->ima.active_table.device_metadata;
|
||
|
md->ima.inactive_table.device_metadata_len =
|
||
|
md->ima.active_table.device_metadata_len;
|
||
|
md->ima.inactive_table.num_targets =
|
||
|
md->ima.active_table.num_targets;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
kfree(dev_name);
|
||
|
kfree(dev_uuid);
|
||
|
error2:
|
||
|
kfree(capacity_str);
|
||
|
error1:
|
||
|
kfree(device_table_data);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Measure IMA data on device rename.
|
||
|
*/
|
||
|
void dm_ima_measure_on_device_rename(struct mapped_device *md)
|
||
|
{
|
||
|
char *old_device_data = NULL, *new_device_data = NULL, *combined_device_data = NULL;
|
||
|
char *new_dev_name = NULL, *new_dev_uuid = NULL, *capacity_str = NULL;
|
||
|
bool noio = true;
|
||
|
int r;
|
||
|
|
||
|
if (dm_ima_alloc_and_copy_device_data(md, &new_device_data,
|
||
|
md->ima.active_table.num_targets, noio))
|
||
|
return;
|
||
|
|
||
|
if (dm_ima_alloc_and_copy_name_uuid(md, &new_dev_name, &new_dev_uuid, noio))
|
||
|
goto error;
|
||
|
|
||
|
combined_device_data = dm_ima_alloc(DM_IMA_DEVICE_BUF_LEN * 2, GFP_KERNEL, noio);
|
||
|
if (!combined_device_data)
|
||
|
goto error;
|
||
|
|
||
|
r = dm_ima_alloc_and_copy_capacity_str(md, &capacity_str, noio);
|
||
|
if (r)
|
||
|
goto error;
|
||
|
|
||
|
old_device_data = md->ima.active_table.device_metadata;
|
||
|
|
||
|
md->ima.active_table.device_metadata = new_device_data;
|
||
|
md->ima.active_table.device_metadata_len = strlen(new_device_data);
|
||
|
|
||
|
scnprintf(combined_device_data, DM_IMA_DEVICE_BUF_LEN * 2,
|
||
|
"%s%snew_name=%s,new_uuid=%s;%s", DM_IMA_VERSION_STR, old_device_data,
|
||
|
new_dev_name, new_dev_uuid, capacity_str);
|
||
|
|
||
|
dm_ima_measure_data("dm_device_rename", combined_device_data, strlen(combined_device_data),
|
||
|
noio);
|
||
|
|
||
|
goto exit;
|
||
|
|
||
|
error:
|
||
|
kfree(new_device_data);
|
||
|
exit:
|
||
|
kfree(capacity_str);
|
||
|
kfree(combined_device_data);
|
||
|
kfree(old_device_data);
|
||
|
kfree(new_dev_name);
|
||
|
kfree(new_dev_uuid);
|
||
|
}
|