A given block device is identified by it's name and UUID. However, both
these parameters can be renamed. For an external attestation service to
correctly attest a given device, it needs to keep track of these rename
events.
Update the device data with the new values for IMA measurements. Measure
both old and new device name/UUID parameters in the same IMA measurement
event, so that the old and the new values can be connected later.
Signed-off-by: Tushar Sugandhi <tusharsu@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/dm-ima.c | 49 +++++++++++++++++++++++++++++++++++++++++++
drivers/md/dm-ima.h | 1 +
drivers/md/dm-ioctl.c | 3 +++
3 files changed, 53 insertions(+)
diff --git a/drivers/md/dm-ima.c b/drivers/md/dm-ima.c
index b1e1cf6bb4e7..36f99848825a 100644
--- a/drivers/md/dm-ima.c
+++ b/drivers/md/dm-ima.c
@@ -664,12 +664,61 @@ void dm_ima_measure_on_table_clear(struct mapped_device *md, bool new_map)
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, "%snew_name=%s,new_uuid=%s;%s",
+ old_device_data, new_dev_name, new_dev_uuid, capacity_str);
+
+ dm_ima_measure_data("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);
+}
+
#else
void dm_ima_reset_data(struct mapped_device *md) {}
void dm_ima_measure_on_table_load(struct dm_table *table, unsigned int status_flags) {}
void dm_ima_measure_on_device_resume(struct mapped_device *md, bool swap) {}
void dm_ima_measure_on_device_remove(struct mapped_device *md, bool remove_all) {}
void dm_ima_measure_on_table_clear(struct mapped_device *md, bool new_map) {}
+void dm_ima_measure_on_device_rename(struct mapped_device *md) {}
#endif
MODULE_AUTHOR("Tushar Sugandhi <tusharsu@xxxxxxxxxxxxxxxxxxx>");
MODULE_DESCRIPTION("Enables IMA measurements for DM targets");
diff --git a/drivers/md/dm-ima.h b/drivers/md/dm-ima.h
index a17ae953dc67..b1cf014d538d 100644
--- a/drivers/md/dm-ima.h
+++ b/drivers/md/dm-ima.h
@@ -51,5 +51,6 @@ void dm_ima_measure_on_table_load(struct dm_table *table, unsigned int status_fl
void dm_ima_measure_on_device_resume(struct mapped_device *md, bool swap);
void dm_ima_measure_on_device_remove(struct mapped_device *md, bool remove_all);
void dm_ima_measure_on_table_clear(struct mapped_device *md, bool new_map);
+void dm_ima_measure_on_device_rename(struct mapped_device *md);
#endif /*DM_IMA_H*/
diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c
index b07c19037c7c..e45f6c6ef84a 100644
--- a/drivers/md/dm-ioctl.c
+++ b/drivers/md/dm-ioctl.c
@@ -485,6 +485,9 @@ static struct mapped_device *dm_hash_rename(struct dm_ioctl *param,
param->flags |= DM_UEVENT_GENERATED_FLAG;
md = hc->md;
+
+ dm_ima_measure_on_device_rename(md);
+
up_write(&_hash_lock);
kfree(old_name);
--
2.25.1
