From: Namjae Jeon linkinjeon@kernel.org
commit 5005bcb4219156f1bf7587b185080ec1da08518e upstream.
This patch validate session id and tree id in compound request. If first operation in the compound is SMB2 ECHO request, ksmbd bypass session and tree validation. So work->sess and work->tcon could be NULL. If secound request in the compound access work->sess or tcon, It cause NULL pointer dereferecing error.
Cc: stable@vger.kernel.org Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-21165 Signed-off-by: Namjae Jeon linkinjeon@kernel.org Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/ksmbd/server.c | 33 ++++++++++++++++++++------------- fs/ksmbd/smb2pdu.c | 44 +++++++++++++++++++++++++++++++++++++++----- 2 files changed, 59 insertions(+), 18 deletions(-)
--- a/fs/ksmbd/server.c +++ b/fs/ksmbd/server.c @@ -184,24 +184,31 @@ static void __handle_ksmbd_work(struct k goto send; }
- if (conn->ops->check_user_session) { - rc = conn->ops->check_user_session(work); - if (rc < 0) { - command = conn->ops->get_cmd_val(work); - conn->ops->set_rsp_status(work, - STATUS_USER_SESSION_DELETED); - goto send; - } else if (rc > 0) { - rc = conn->ops->get_ksmbd_tcon(work); + do { + if (conn->ops->check_user_session) { + rc = conn->ops->check_user_session(work); if (rc < 0) { - conn->ops->set_rsp_status(work, - STATUS_NETWORK_NAME_DELETED); + if (rc == -EINVAL) + conn->ops->set_rsp_status(work, + STATUS_INVALID_PARAMETER); + else + conn->ops->set_rsp_status(work, + STATUS_USER_SESSION_DELETED); goto send; + } else if (rc > 0) { + rc = conn->ops->get_ksmbd_tcon(work); + if (rc < 0) { + if (rc == -EINVAL) + conn->ops->set_rsp_status(work, + STATUS_INVALID_PARAMETER); + else + conn->ops->set_rsp_status(work, + STATUS_NETWORK_NAME_DELETED); + goto send; + } } } - }
- do { rc = __process_request(work, conn, &command); if (rc == SERVER_HANDLER_ABORT) break; --- a/fs/ksmbd/smb2pdu.c +++ b/fs/ksmbd/smb2pdu.c @@ -97,7 +97,6 @@ int smb2_get_ksmbd_tcon(struct ksmbd_wor struct smb2_hdr *req_hdr = work->request_buf; int tree_id;
- work->tcon = NULL; if (work->conn->ops->get_cmd_val(work) == SMB2_TREE_CONNECT_HE || work->conn->ops->get_cmd_val(work) == SMB2_CANCEL_HE || work->conn->ops->get_cmd_val(work) == SMB2_LOGOFF_HE) { @@ -111,10 +110,28 @@ int smb2_get_ksmbd_tcon(struct ksmbd_wor }
tree_id = le32_to_cpu(req_hdr->Id.SyncId.TreeId); + + /* + * If request is not the first in Compound request, + * Just validate tree id in header with work->tcon->id. + */ + if (work->next_smb2_rcv_hdr_off) { + if (!work->tcon) { + pr_err("The first operation in the compound does not have tcon\n"); + return -EINVAL; + } + if (work->tcon->id != tree_id) { + pr_err("tree id(%u) is different with id(%u) in first operation\n", + tree_id, work->tcon->id); + return -EINVAL; + } + return 1; + } + work->tcon = ksmbd_tree_conn_lookup(work->sess, tree_id); if (!work->tcon) { pr_err("Invalid tid %d\n", tree_id); - return -EINVAL; + return -ENOENT; }
return 1; @@ -569,7 +586,6 @@ int smb2_check_user_session(struct ksmbd unsigned int cmd = conn->ops->get_cmd_val(work); unsigned long long sess_id;
- work->sess = NULL; /* * SMB2_ECHO, SMB2_NEGOTIATE, SMB2_SESSION_SETUP command do not * require a session id, so no need to validate user session's for @@ -580,15 +596,33 @@ int smb2_check_user_session(struct ksmbd return 0;
if (!ksmbd_conn_good(work)) - return -EINVAL; + return -EIO;
sess_id = le64_to_cpu(req_hdr->SessionId); + + /* + * If request is not the first in Compound request, + * Just validate session id in header with work->sess->id. + */ + if (work->next_smb2_rcv_hdr_off) { + if (!work->sess) { + pr_err("The first operation in the compound does not have sess\n"); + return -EINVAL; + } + if (work->sess->id != sess_id) { + pr_err("session id(%llu) is different with the first operation(%lld)\n", + sess_id, work->sess->id); + return -EINVAL; + } + return 1; + } + /* Check for validity of user session */ work->sess = ksmbd_session_lookup_all(conn, sess_id); if (work->sess) return 1; ksmbd_debug(SMB, "Invalid user session, Uid %llu\n", sess_id); - return -EINVAL; + return -ENOENT; }
static void destroy_previous_session(struct ksmbd_conn *conn,