diff options
| author | Tushar Sugandhi <tusharsu@linux.microsoft.com> | 2021-08-13 14:37:56 -0700 |
|---|---|---|
| committer | Mike Snitzer <snitzer@redhat.com> | 2021-08-20 15:59:43 -0400 |
| commit | 8f509fd4a53ffaf07feeef6dd48cc6bd060ca4f3 (patch) | |
| tree | 43c5d2e80e6609103284f12f173b7d43621412c7 /drivers/md/dm-ima.c | |
| parent | 528b16bfc3ae5f11638e71b3b63a81f9999df727 (diff) | |
dm ima: prefix dm table hashes in ima log with hash algorithm
The active/inactive table hashes measured in the ima log do not contain
the information about hash algorithm. This information is useful for the
attestation servers to recreate the hashes and compare them with the ones
present in the ima log to verify the table contents.
Prefix the table hashes in various DM events in ima log with the hash
algorithm used to compute those hashes.
Signed-off-by: Tushar Sugandhi <tusharsu@linux.microsoft.com>
Suggested-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm-ima.c')
| -rw-r--r-- | drivers/md/dm-ima.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/drivers/md/dm-ima.c b/drivers/md/dm-ima.c index 91ea4a7202ab..d4184ff28cca 100644 --- a/drivers/md/dm-ima.c +++ b/drivers/md/dm-ima.c @@ -186,6 +186,11 @@ void dm_ima_measure_on_table_load(struct dm_table *table, unsigned int status_fl struct crypto_shash *tfm = NULL; u8 *digest = NULL; bool noio = false; + /* + * In below hash_alg_prefix_len assignment +1 is for the additional char (':'), + * when prefixing the hash value with the hash algorithm name. e.g. sha256:<hash_value>. + */ + const size_t hash_alg_prefix_len = strlen(DM_IMA_TABLE_HASH_ALG) + 1; ima_buf = dm_ima_alloc(DM_IMA_MEASUREMENT_BUF_LEN, GFP_KERNEL, noio); if (!ima_buf) @@ -204,7 +209,7 @@ void dm_ima_measure_on_table_load(struct dm_table *table, unsigned int status_fl if (dm_ima_alloc_and_copy_device_data(table->md, &device_data_buf, num_targets, noio)) goto error; - tfm = crypto_alloc_shash("sha256", 0, 0); + tfm = crypto_alloc_shash(DM_IMA_TABLE_HASH_ALG, 0, 0); if (IS_ERR(tfm)) goto error; @@ -315,12 +320,15 @@ void dm_ima_measure_on_table_load(struct dm_table *table, unsigned int status_fl if (r < 0) goto error; - digest_buf = dm_ima_alloc((digest_size*2)+1, GFP_KERNEL, noio); + digest_buf = dm_ima_alloc((digest_size*2) + hash_alg_prefix_len + 1, GFP_KERNEL, noio); + if (!digest_buf) goto error; + snprintf(digest_buf, hash_alg_prefix_len + 1, "%s:", DM_IMA_TABLE_HASH_ALG); + for (i = 0; i < digest_size; i++) - snprintf((digest_buf+(i*2)), 3, "%02x", digest[i]); + snprintf((digest_buf + hash_alg_prefix_len + (i*2)), 3, "%02x", digest[i]); if (table->md->ima.active_table.hash != table->md->ima.inactive_table.hash) kfree(table->md->ima.inactive_table.hash); |