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0a8e987dcc
When building SYN packet in tcp_syn_options(), MSS, TS, WS, and
SACKPERM are used without checking the remaining bytes in the
options area.
To keep that logic as is, we limit the TCP-AO MAC length in
tcp_ao_parse_crypto(). Currently, the limit is calculated as below.
MAX_TCP_OPTION_SPACE - TCPOLEN_TSTAMP_ALIGNED
- TCPOLEN_WSCALE_ALIGNED
- TCPOLEN_SACKPERM_ALIGNED
This looks confusing as (1) we pack SACKPERM into the leading
2-bytes of the aligned 12-bytes of TS and (2) TCPOLEN_MSS_ALIGNED
is not used. Fortunately, the calculated limit is not wrong as
TCPOLEN_SACKPERM_ALIGNED and TCPOLEN_MSS_ALIGNED are the same value.
However, we should use the proper constant in the formula.
MAX_TCP_OPTION_SPACE - TCPOLEN_MSS_ALIGNED
- TCPOLEN_TSTAMP_ALIGNED
- TCPOLEN_WSCALE_ALIGNED
Fixes:
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.