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Matthieu Baerts (NGI0)
dcc03f270d
Fuzzers and static checkers might not detect when tcp_sk() is used with a non tcp_sock structure. This kind of mistake already happened a few times with MPTCP: when wrongly using TCP-specific helpers with mptcp_sock pointers. On the other hand, there are many 'tcp_xxx()' helpers that are taking a 'struct sock' pointer as arguments, and some of them are only looking at fields from 'struct sock', and nothing from 'struct tcp_sock'. It is then tempting to use them with a 'struct mptcp_sock'. So a new simple check is done when CONFIG_DEBUG_NET is enabled to tell kernel devs when a non-TCP socket is being used as a TCP one. 'tcp_sk()' macro is then re-defined to add a WARN when an unexpected socket is being used. Reviewed-by: Mat Martineau <martineau@kernel.org> Signed-off-by: Matthieu Baerts (NGI0) <matttbe@kernel.org> Link: https://lore.kernel.org/r/20240223-upstream-net-next-20240223-misc-improvements-v1-3-b6c8a10396bd@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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.