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63c7049ef9
Kui-Feng Lee says: ==================== Recently, st_ops->cfi_stubs was introduced. However, the upcoming new struct_ops support (e.g. sched_ext) is not aware of this and does not provide its own cfi_stubs. The kernel ends up NULL dereferencing the st_ops->cfi_stubs. Considering struct_ops supports kernel module now, this NULL check is necessary. This patch set is to reject struct_ops registration that does not provide a cfi_stubs. Changes from v4: - Remove changes of check_member. - Remove checks of the pointers in cfi_stubs[]. Changes from v3: - Remove CFI stub function for get_info. - Allow passing NULL prog arg to check_member of struct bpf_struct_ops type. - Call check_member to determines if a CFI stub function should be defined for an operator. Changes from v2: - Add a stub function for get_info of struct tcp_congestion_ops. Changes from v1: - Check *(void **)(cfi_stubs + moff) to make sure stub functions are provided for every operator. - Add a test case to ensure that struct_ops rejects incomplete cfi_stub. v4: https://lore.kernel.org/all/20240221075213.2071454-1-thinker.li@gmail.com/ v3: https://lore.kernel.org/all/20240216193434.735874-1-thinker.li@gmail.com/ v2: https://lore.kernel.org/all/20240216020350.2061373-1-thinker.li@gmail.com/ v1: https://lore.kernel.org/all/20240215022401.1882010-1-thinker.li@gmail.com/ ==================== Signed-off-by: Martin KaFai Lau <martin.lau@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 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.