diff options
Diffstat (limited to 'security/keys/keyctl.c')
| -rw-r--r-- | security/keys/keyctl.c | 33 |
1 files changed, 22 insertions, 11 deletions
diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c index 3364fbf4680..6d9d0c74752 100644 --- a/security/keys/keyctl.c +++ b/security/keys/keyctl.c @@ -46,6 +46,9 @@ static int key_get_type_from_user(char *type, * Extract the description of a new key from userspace and either add it as a * new key to the specified keyring or update a matching key in that keyring. * + * If the description is NULL or an empty string, the key type is asked to + * generate one from the payload. + * * The keyring must be writable so that we can attach the key to it. * * If successful, the new key's serial number is returned, otherwise an error @@ -72,10 +75,17 @@ SYSCALL_DEFINE5(add_key, const char __user *, _type, if (ret < 0) goto error; - description = strndup_user(_description, PAGE_SIZE); - if (IS_ERR(description)) { - ret = PTR_ERR(description); - goto error; + description = NULL; + if (_description) { + description = strndup_user(_description, PAGE_SIZE); + if (IS_ERR(description)) { + ret = PTR_ERR(description); + goto error; + } + if (!*description) { + kfree(description); + description = NULL; + } } /* pull the payload in if one was supplied */ @@ -1112,12 +1122,12 @@ long keyctl_instantiate_key_iov(key_serial_t id, ret = rw_copy_check_uvector(WRITE, _payload_iov, ioc, ARRAY_SIZE(iovstack), iovstack, &iov); if (ret < 0) - return ret; + goto err; if (ret == 0) goto no_payload_free; ret = keyctl_instantiate_key_common(id, iov, ioc, ret, ringid); - +err: if (iov != iovstack) kfree(iov); return ret; @@ -1475,7 +1485,8 @@ long keyctl_session_to_parent(void) goto error_keyring; newwork = &cred->rcu; - cred->tgcred->session_keyring = key_ref_to_ptr(keyring_r); + cred->session_keyring = key_ref_to_ptr(keyring_r); + keyring_r = NULL; init_task_work(newwork, key_change_session_keyring); me = current; @@ -1500,7 +1511,7 @@ long keyctl_session_to_parent(void) mycred = current_cred(); pcred = __task_cred(parent); if (mycred == pcred || - mycred->tgcred->session_keyring == pcred->tgcred->session_keyring) { + mycred->session_keyring == pcred->session_keyring) { ret = 0; goto unlock; } @@ -1516,9 +1527,9 @@ long keyctl_session_to_parent(void) goto unlock; /* the keyrings must have the same UID */ - if ((pcred->tgcred->session_keyring && - pcred->tgcred->session_keyring->uid != mycred->euid) || - mycred->tgcred->session_keyring->uid != mycred->euid) + if ((pcred->session_keyring && + pcred->session_keyring->uid != mycred->euid) || + mycred->session_keyring->uid != mycred->euid) goto unlock; /* cancel an already pending keyring replacement */ |