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-rw-r--r--security/keys/request_key.c55
1 files changed, 45 insertions, 10 deletions
diff --git a/security/keys/request_key.c b/security/keys/request_key.c
index d8c1a6a0fb0..f656e9c069e 100644
--- a/security/keys/request_key.c
+++ b/security/keys/request_key.c
@@ -299,12 +299,15 @@ static int construct_alloc_key(struct key_type *type,
struct key_user *user,
struct key **_key)
{
+ struct keyring_list *prealloc;
const struct cred *cred = current_cred();
struct key *key;
key_ref_t key_ref;
+ int ret;
kenter("%s,%s,,,", type->name, description);
+ *_key = NULL;
mutex_lock(&user->cons_lock);
key = key_alloc(type, description, cred->fsuid, cred->fsgid, cred,
@@ -314,8 +317,12 @@ static int construct_alloc_key(struct key_type *type,
set_bit(KEY_FLAG_USER_CONSTRUCT, &key->flags);
- if (dest_keyring)
- down_write(&dest_keyring->sem);
+ if (dest_keyring) {
+ ret = __key_link_begin(dest_keyring, type, description,
+ &prealloc);
+ if (ret < 0)
+ goto link_prealloc_failed;
+ }
/* attach the key to the destination keyring under lock, but we do need
* to do another check just in case someone beat us to it whilst we
@@ -327,31 +334,49 @@ static int construct_alloc_key(struct key_type *type,
goto key_already_present;
if (dest_keyring)
- __key_link(dest_keyring, key);
+ __key_link(dest_keyring, key, &prealloc);
mutex_unlock(&key_construction_mutex);
if (dest_keyring)
- up_write(&dest_keyring->sem);
+ __key_link_end(dest_keyring, type, prealloc);
mutex_unlock(&user->cons_lock);
*_key = key;
kleave(" = 0 [%d]", key_serial(key));
return 0;
+ /* the key is now present - we tell the caller that we found it by
+ * returning -EINPROGRESS */
key_already_present:
+ key_put(key);
mutex_unlock(&key_construction_mutex);
+ key = key_ref_to_ptr(key_ref);
if (dest_keyring) {
- __key_link(dest_keyring, key_ref_to_ptr(key_ref));
- up_write(&dest_keyring->sem);
+ ret = __key_link_check_live_key(dest_keyring, key);
+ if (ret == 0)
+ __key_link(dest_keyring, key, &prealloc);
+ __key_link_end(dest_keyring, type, prealloc);
+ if (ret < 0)
+ goto link_check_failed;
}
mutex_unlock(&user->cons_lock);
- key_put(key);
- *_key = key = key_ref_to_ptr(key_ref);
+ *_key = key;
kleave(" = -EINPROGRESS [%d]", key_serial(key));
return -EINPROGRESS;
+link_check_failed:
+ mutex_unlock(&user->cons_lock);
+ key_put(key);
+ kleave(" = %d [linkcheck]", ret);
+ return ret;
+
+link_prealloc_failed:
+ up_write(&dest_keyring->sem);
+ mutex_unlock(&user->cons_lock);
+ kleave(" = %d [prelink]", ret);
+ return ret;
+
alloc_failed:
mutex_unlock(&user->cons_lock);
- *_key = NULL;
kleave(" = %ld", PTR_ERR(key));
return PTR_ERR(key);
}
@@ -390,6 +415,10 @@ static struct key *construct_key_and_link(struct key_type *type,
kdebug("cons failed");
goto construction_failed;
}
+ } else if (ret == -EINPROGRESS) {
+ ret = 0;
+ } else {
+ key = ERR_PTR(ret);
}
key_put(dest_keyring);
@@ -422,6 +451,7 @@ struct key *request_key_and_link(struct key_type *type,
const struct cred *cred = current_cred();
struct key *key;
key_ref_t key_ref;
+ int ret;
kenter("%s,%s,%p,%zu,%p,%p,%lx",
type->name, description, callout_info, callout_len, aux,
@@ -435,8 +465,13 @@ struct key *request_key_and_link(struct key_type *type,
key = key_ref_to_ptr(key_ref);
if (dest_keyring) {
construct_get_dest_keyring(&dest_keyring);
- key_link(dest_keyring, key);
+ ret = key_link(dest_keyring, key);
key_put(dest_keyring);
+ if (ret < 0) {
+ key_put(key);
+ key = ERR_PTR(ret);
+ goto error;
+ }
}
} else if (PTR_ERR(key_ref) != -EAGAIN) {
key = ERR_CAST(key_ref);