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94079b6425
Alexei Starovoitov says: ==================== v2->v3: fixed issues in backtracking pointed out by Andrii. The next step is to add a lot more tests for backtracking. v1->v2: addressed Andrii's feedback. this patch set introduces verifier support for bounded loops and adds several other improvements. Ideally they would be introduced one at a time, but to support bounded loop the verifier needs to 'step back' in the patch 1. That patch introduces tracking of spill/fill of constants through the stack. Though it's a useful feature it hurts cilium tests. Patch 3 introduces another feature by extending is_branch_taken logic to 'if rX op rY' conditions. This feature is also necessary to support bounded loops. Then patch 4 adds support for the loops while adding key heuristics with jmp_processed. Introduction of parentage chain of verifier states in patch 4 allows patch 9 to add backtracking of precise scalar registers which finally resolves degradation from patch 1. The end result is much faster verifier for existing programs and new support for loops. See patch 8 for many kinds of loops that are now validated. Patch 9 is the most tricky one and could be rewritten with a different algorithm in the future. ==================== Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> |
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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.