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KEYS: user_defined: sanitize key payloads

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Zero the payloads of user and logon keys before freeing them.  This
prevents sensitive key material from being kept around in the slab
caches after a key is released.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
This commit is contained in:
Eric Biggers 2017-06-08 14:49:04 +01:00 committed by James Morris
parent 57070c850a
commit 6966c74932
1 changed files with 12 additions and 4 deletions
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16
security/keys/user_defined.c
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@ -86,10 +86,18 @@ EXPORT_SYMBOL_GPL(user_preparse);
*/
void user_free_preparse(struct key_preparsed_payload *prep)
{
kfree(prep->payload.data[0]);
kzfree(prep->payload.data[0]);
}
EXPORT_SYMBOL_GPL(user_free_preparse);
static void user_free_payload_rcu(struct rcu_head *head)
{
struct user_key_payload *payload;
payload = container_of(head, struct user_key_payload, rcu);
kzfree(payload);
}
/*
* update a user defined key
* - the key's semaphore is write-locked
@ -112,7 +120,7 @@ int user_update(struct key *key, struct key_preparsed_payload *prep)
prep->payload.data[0] = NULL;
if (zap)
kfree_rcu(zap, rcu);
call_rcu(&zap->rcu, user_free_payload_rcu);
return ret;
}
EXPORT_SYMBOL_GPL(user_update);
@ -130,7 +138,7 @@ void user_revoke(struct key *key)
if (upayload) {
rcu_assign_keypointer(key, NULL);
kfree_rcu(upayload, rcu);
call_rcu(&upayload->rcu, user_free_payload_rcu);
}
}
@ -143,7 +151,7 @@ void user_destroy(struct key *key)
{
struct user_key_payload *upayload = key->payload.data[0];
kfree(upayload);
kzfree(upayload);
}
EXPORT_SYMBOL_GPL(user_destroy);