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BPF loads with BPF_PROBE_MEM(SX) can load from unsafe pointers and the JIT adds an exception table entry for the JITed instruction which allows the exeption handler to set the destination register of the load to zero and continue execution from the next instruction. As all arm64 instructions are AARCH64_INSN_SIZE size, the exception handler can just increment the pc by AARCH64_INSN_SIZE without needing the exact address of the instruction following the the faulting instruction. Simplify the exception table usage in arm64 JIT by only saving the destination register in ex->fixup and drop everything related to the fixup_offset. The fault handler is modified to add AARCH64_INSN_SIZE to the pc. Signed-off-by: Puranjay Mohan <puranjay@kernel.org> Acked-by: Yonghong Song <yonghong.song@linux.dev> Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Acked-by: Xu Kuohai <xukuohai@huawei.com> Link: https://lore.kernel.org/r/20250911145808.58042-2-puranjay@kernel.org 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.