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fb19816541
Offloaded programs using BPF-to-BPF calls use the stack to store the return address when calling into a subprogram. Callees also need some space to save eBPF registers R6 to R9. And contrarily to kernel verifier, we align stack frames on 64 bytes (and not 32). Account for all this when checking the stack size limit before JIT-ing the program. This means we have to recompute maximum stack usage for the program, we cannot get the value from the kernel. In addition to adapting the checks on stack usage, move them to the finalize() callback, now that we have it and because such checks are part of the verification step rather than translation. Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com> Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.