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authorEric Richter <erichte@linux.vnet.ibm.com>2016-06-01 13:14:05 -0500
committerMimi Zohar <zohar@linux.vnet.ibm.com>2016-06-30 01:14:21 -0400
commit67696f6d79923cdc0084b73b4bbe52e6749a43a4 (patch)
tree63a973617eb61e72310fa8b9e8eef01655ff4ca2 /security/integrity/ima/ima_queue.c
parent5f6f027b50d8ed9f1ba4447aa5aed3a94b601fe8 (diff)
downloadlinux-67696f6d79923cdc0084b73b4bbe52e6749a43a4.tar.gz
ima: redefine duplicate template entries
Template entry duplicates are prevented from being added to the measurement list by checking a hash table that contains the template entry digests. However, the PCR value is not included in this comparison, so duplicate template entry digests with differing PCRs may be dropped. This patch redefines duplicate template entries as template entries with the same digest and same PCR values. Reported-by: Mimi Zohar <zohar@linux.vnet.ibm.com> Signed-off-by: Eric Richter <erichte@linux.vnet.ibm.com> Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Diffstat (limited to 'security/integrity/ima/ima_queue.c')
-rw-r--r--security/integrity/ima/ima_queue.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/security/integrity/ima/ima_queue.c b/security/integrity/ima/ima_queue.c
index 552705d5a78d..04a9ac13e85e 100644
--- a/security/integrity/ima/ima_queue.c
+++ b/security/integrity/ima/ima_queue.c
@@ -44,7 +44,8 @@ struct ima_h_table ima_htable = {
static DEFINE_MUTEX(ima_extend_list_mutex);
/* lookup up the digest value in the hash table, and return the entry */
-static struct ima_queue_entry *ima_lookup_digest_entry(u8 *digest_value)
+static struct ima_queue_entry *ima_lookup_digest_entry(u8 *digest_value,
+ int pcr)
{
struct ima_queue_entry *qe, *ret = NULL;
unsigned int key;
@@ -54,7 +55,7 @@ static struct ima_queue_entry *ima_lookup_digest_entry(u8 *digest_value)
rcu_read_lock();
hlist_for_each_entry_rcu(qe, &ima_htable.queue[key], hnext) {
rc = memcmp(qe->entry->digest, digest_value, TPM_DIGEST_SIZE);
- if (rc == 0) {
+ if ((rc == 0) && (qe->entry->pcr == pcr)) {
ret = qe;
break;
}
@@ -118,7 +119,7 @@ int ima_add_template_entry(struct ima_template_entry *entry, int violation,
mutex_lock(&ima_extend_list_mutex);
if (!violation) {
memcpy(digest, entry->digest, sizeof(digest));
- if (ima_lookup_digest_entry(digest)) {
+ if (ima_lookup_digest_entry(digest, entry->pcr)) {
audit_cause = "hash_exists";
result = -EEXIST;
goto out;