4.4-stable review patch. If anyone has any objections, please let me know.
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From: Ilya Dryomov idryomov@gmail.com
commit 0fd3fd0a9bb0b02b6435bb7070e9f7b82a23f068 upstream.
The authorize reply can be empty, for example when the ticket used to build the authorizer is too old and TAG_BADAUTHORIZER is returned from the service. Calling ->verify_authorizer_reply() results in an attempt to decrypt and validate (somewhat) random data in au->buf (most likely the signature block from calc_signature()), which fails and ends up in con_fault_finish() with !con->auth_retry. The ticket isn't invalidated and the connection is retried again and again until a new ticket is obtained from the monitor:
libceph: osd2 192.168.122.1:6809 bad authorize reply libceph: osd2 192.168.122.1:6809 bad authorize reply libceph: osd2 192.168.122.1:6809 bad authorize reply libceph: osd2 192.168.122.1:6809 bad authorize reply
Let TAG_BADAUTHORIZER handler kick in and increment con->auth_retry.
Cc: stable@vger.kernel.org Fixes: 5c056fdc5b47 ("libceph: verify authorize reply on connect") Link: https://tracker.ceph.com/issues/20164 Signed-off-by: Ilya Dryomov idryomov@gmail.com Reviewed-by: Sage Weil sage@redhat.com [idryomov@gmail.com: backport to 4.4: extra arg, no CEPHX_V2] Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- net/ceph/messenger.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-)
--- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -2049,15 +2049,19 @@ static int process_connect(struct ceph_c dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
if (con->auth_reply_buf) { + int len = le32_to_cpu(con->in_reply.authorizer_len); + /* * Any connection that defines ->get_authorizer() * should also define ->verify_authorizer_reply(). * See get_connect_authorizer(). */ - ret = con->ops->verify_authorizer_reply(con, 0); - if (ret < 0) { - con->error_msg = "bad authorize reply"; - return ret; + if (len) { + ret = con->ops->verify_authorizer_reply(con, 0); + if (ret < 0) { + con->error_msg = "bad authorize reply"; + return ret; + } } }