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Eduard Zingerman says: ==================== bpf: fix null pointer access for malformed BPF_CORE_TYPE_ID_LOCAL relos Liu RuiTong reported an in-kernel null pointer derefence when processing BPF_CORE_TYPE_ID_LOCAL relocations referencing non-existing BTF types. Fix this by adding proper id checks. Changes v2->v3: - selftest update suggested by Andrii: avoid memset(0) for log buffer and do memset(0) for bpf_attr. Changes v1->v2: - moved check from bpf_core_calc_relo_insn() to bpf_core_apply() now both in kernel and in libbpf relocation type id is guaranteed to exist when bpf_core_calc_relo_insn() is called; - added a test case. v1: https://lore.kernel.org/bpf/20240821164620.1056362-1-eddyz87@gmail.com/ v2: https://lore.kernel.org/bpf/20240822001837.2715909-1-eddyz87@gmail.com/ ==================== Link: https://lore.kernel.org/r/20240822080124.2995724-1-eddyz87@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org> |
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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 reStructuredText 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.