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Paul Chaignon says: ==================== The BPF verifier checks the maximum number of call stack frames twice, first in the main CFG traversal (do_check) and then in a subsequent traversal (check_max_stack_depth). If the second check fails, it logs a 'verifier bug' warning and errors out, as the number of call stack frames should have been verified already. However, the second check may fail without indicating a verifier bug: if the excessive function calls reside in dead code, the main CFG traversal may not visit them; the subsequent traversal visits all instructions, including dead code. This case raises the question of how invalid dead code should be treated. The first patch implements the conservative option and rejects such code; the second adds a test 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.