CVE-2023-52636: libceph: just wait for more data to be available on the socket

In the Linux kernel, the following vulnerability has been resolved:

libceph: just wait for more data to be available on the socket

A short read may occur while reading the message footer from the socket. Later, when the socket is ready for another read, the messenger invokes all readpartial() handlers, including readpartialsparsemsgdata(). The expectation is that readpartialsparsemsgdata() would bail, allowing the messenger to invoke readpartial() for the footer and pick up where it left off.

However readpartialsparsemsgdata() violates that and ends up calling into the state machine in the OSD client. The sparse-read state machine assumes that it's a new op and interprets some piece of the footer as the sparse-read header and returns bogus extents/data length, etc.

To determine whether readpartialsparsemsgdata() should bail, let's reuse cursor->totalresid. Because once it reaches to zero that means all the extents and data have been successfully received in last read, else it could break out when partially reading any of the extents and data. And then osdsparseread() could continue where it left off.

[ idryomov: changelog ]