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This patch also modifies the BPF verifier to only return error for invalid kfunc calls specially marked by userspace (with insn->imm == 0, insn->off == 0) after the verifier has eliminated dead instructions. This can be handled in the fixup stage, and skip processing during add and check stages. If such an invalid call is dropped, the fixup stage will not encounter insn->imm as 0, otherwise it bails out and returns an error. This will be exposed as weak ksym support in libbpf in later patches. Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Link: https://lore.kernel.org/bpf/20211002011757.311265-3-memxor@gmail.com |
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| fs | ||
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| kernel | ||
| lib | ||
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| .get_maintainer.ignore | ||
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| README | ||
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.