In the Linux kernel, the following vulnerability has been resolved: mptcp: avoid combining some incoming suboptions Some MPTCP suboptions

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

mptcp: avoid combining some incoming suboptions

Some MPTCP suboptions are mutually exclusive according to the RFC8684,
but also because in different places, the code doesn't expect some
combinations to be present. That's specially true for suboptions that
would be present twice, but with different attributes.

The new restrictions are the same as the ones applied on the output
side, with mptcp_write_options. The same rules can be reused with a
small fix: an MP_FASTCLOSE can be used with a DSS when the sender picks
this option [1], which is not the case on Linux. Here are the rules:

Which options can be used together?

X: mutually exclusive
O: often used together
C: can be used together in some cases
P: could be used together but we prefer not to (optimisations)

The only difference is with the 'P': another stack could send and
ADD_ADDR with other suboptions (DSS, RM_ADDR), and this should be
allowed.

A few points of attention:

• In theory, an MP_CAPABLE could be used with a RM_ADDR, but there is
  no reason to add it with a SYN. Note that even with a 4th ACK, it
  doesn't seem to be useful, except when IDs are known in advance via
  another channel. Better not to break that.

• Now, combining both an MP_CAPABLE and an MP_JOIN will no longer
  result to a reject of the two options, but only the second suboption
  is ignored. That seems OK to do that for this unexpected error. At
  least now all inconsistent combinations are handled the same way.
  This could change later in next. This also means the explicit checks
  for having both MPC + MPJ in subflow.c will now be unreachable.
  That's fine, they will be removed in a follow-up patch.

• In case of conflicting combinations, the extra suboption(s) is/are
  ignored: having such combinations either means the remote peer is
  buggy, or is evil. The simplest action is then taken in this case:
  stop processing the current suboption.

• In mp_opt->suboptions, there is also a bit reserved to the checksum,
  which can be used in an MP_CAPABLE and a DSS. Each time a DSS option
  can be used in parallel with another option, the checksum can be set,
  so the verification is combined into a new OPTIONS_MPTCP_DSS macro.

• An MP_CAPABLE ACK can carry a Data-Level Length, and an optional
  Checksum: they are the same as the ones found in a DSS, because a DSS
  cannot be used in parallel to an MP_CAPABLE. Similarly, even if there
  is room, a DSS cannot be used with an MP_JOIN.