> selftest/bpf: Fixing powerpc JIT disassembly failure
>
> Ensure that the trampoline stubs JITed at the tail of the
> epilogue do not expose the dummy trampoline address stored
> in the last 8 bytes(64-bit) and last 4 bytes(32-bit)
> to the disassembly flow. Prevent the disassembler from
> ingesting this memory address, as it may occasionally decode
> into a seemingly valid but incorrect instruction. Fix this
> issue by truncating the last 8/4 bytes from JITed buffers
> before supplying them for disassembly.
>
> Signed-off-by: Abhishek Dubey <[email protected]>
This looks like a bug fix, but there's no Fixes: tag. The code being
corrected is the disasm_one_func(text_out, image + pc, func_lens[i]) call
in get_jited_program_text(), which feeds the full JITed function length
(including the trampoline tail holding the dummy trampoline address) to
the disassembler. That helper and call site were added by commit
b991fc520700.
Should this include:
Fixes: b991fc520700 ("selftests/bpf: utility function to get program
disassembly after jit")
---
AI reviewed your patch. Please fix the bug or email reply why it's not a bug.
See: https://github.com/kernel-patches/vmtest/blob/master/ci/claude/README.md
CI run summary: https://github.com/kernel-patches/bpf/actions/runs/27620315552
