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Stanislav Fomichev says: ==================== Current setsockopt hook is limited to the size of the buffer that user had supplied. Since we always allocate memory and copy the value into kernel space, allocate just a little bit more in case BPF program needs to override input data with a larger value. The canonical example is TCP_CONGESTION socket option where input buffer is a string and if user calls it with a short string, BPF program has no way of extending it. The tests are extended with TCP_CONGESTION use case. ==================== Signed-off-by: Alexei Starovoitov <ast@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.