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Mon, 12 Jul 2021 20:55:38 -0400 X-MC-Unique: I9iIePb1MNW3VsZpJJnUsg-1 Received: from Lenovo-Legion-Ubuntu.lan (c-71-197-163-6.hsd1.wa.comcast.net [71.197.163.6]) by linux.microsoft.com (Postfix) with ESMTPSA id 44CBB20B8010; Mon, 12 Jul 2021 17:49:13 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 44CBB20B8010 From: Tushar Sugandhi To: dm-devel@redhat.com, agk@redhat.com, snitzer@redhat.com Date: Mon, 12 Jul 2021 17:49:01 -0700 Message-Id: <20210713004904.8808-5-tusharsu@linux.microsoft.com> In-Reply-To: <20210713004904.8808-1-tusharsu@linux.microsoft.com> References: <20210713004904.8808-1-tusharsu@linux.microsoft.com> MIME-Version: 1.0 X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 X-MIME-Autoconverted: from quoted-printable to 8bit by lists01.pubmisc.prod.ext.phx2.redhat.com id 16D0thfq025262 X-loop: dm-devel@redhat.com Cc: tusharsu@linux.microsoft.com, nramas@linux.microsoft.com, linux-integrity@vger.kernel.org, zohar@linux.ibm.com Subject: [dm-devel] [PATCH 4/7] dm: measure data on table clear X-BeenThere: dm-devel@redhat.com X-Mailman-Version: 2.1.12 Precedence: junk List-Id: device-mapper development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=dm-devel-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com For a given block device, an inactive table slot contains the parameters to configure the device with. The inactive table can be cleared multiple times, accidentally or maliciously, which may impact the functionality of the device, and compromise the system. Therefore it is important to measure and log the event when a table is cleared. Measure device parameters, and table hashes when the inactive table slot is cleared. Signed-off-by: Tushar Sugandhi --- drivers/md/dm-ima.c | 93 +++++++++++++++++++++++++++++++++++++++++++ drivers/md/dm-ima.h | 2 + drivers/md/dm-ioctl.c | 3 ++ 3 files changed, 98 insertions(+) diff --git a/drivers/md/dm-ima.c b/drivers/md/dm-ima.c index 47eca432a21a..b1e1cf6bb4e7 100644 --- a/drivers/md/dm-ima.c +++ b/drivers/md/dm-ima.c @@ -572,11 +572,104 @@ void dm_ima_measure_on_device_remove(struct mapped_device *md, bool remove_all) 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; + 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; + + 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++; + } + + if (!l) { + 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, + "name=%s,uuid=%s;table_clear=no_data;", 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("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); +} + #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) {} #endif MODULE_AUTHOR("Tushar Sugandhi "); MODULE_DESCRIPTION("Enables IMA measurements for DM targets"); diff --git a/drivers/md/dm-ima.h b/drivers/md/dm-ima.h index cb7b883ed35b..a17ae953dc67 100644 --- a/drivers/md/dm-ima.h +++ b/drivers/md/dm-ima.h @@ -50,4 +50,6 @@ 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); + #endif /*DM_IMA_H*/ diff --git a/drivers/md/dm-ioctl.c b/drivers/md/dm-ioctl.c index 2d4475f6de7d..b07c19037c7c 100644 --- a/drivers/md/dm-ioctl.c +++ b/drivers/md/dm-ioctl.c @@ -1508,6 +1508,7 @@ static int table_clear(struct file *filp, struct dm_ioctl *param, size_t param_s struct hash_cell *hc; struct mapped_device *md; struct dm_table *old_map = NULL; + bool has_new_map = false; down_write(&_hash_lock); @@ -1521,6 +1522,7 @@ static int table_clear(struct file *filp, struct dm_ioctl *param, size_t param_s if (hc->new_map) { old_map = hc->new_map; hc->new_map = NULL; + has_new_map = true; } param->flags &= ~DM_INACTIVE_PRESENT_FLAG; @@ -1532,6 +1534,7 @@ static int table_clear(struct file *filp, struct dm_ioctl *param, size_t param_s dm_sync_table(md); dm_table_destroy(old_map); } + dm_ima_measure_on_table_clear(md, has_new_map); dm_put(md); return 0;