ttools: protect ptrace hook lifetime during module unload · Pull Request !1871 · OpenCloudOS/OpenCloudOS-Kernel

## Summary

The ttools module exports `ptrace_pre_hook` and clears it during module exit, but a task could load the non-NULL pointer just before the clear and then call it after the module text had been freed. The native and compat ptrace paths now load and invoke the hook inside one RCU read-side critical section, the pointer is published with `rcu_assign_pointer()`, and `ttools_exit()` clears it and waits with `synchronize_rcu()` before module teardown can free the text. The hook type is annotated as RCU-protected so future users keep the same contract. I extended the ttools ptrace selftest to keep `PTRACE_ATTACH` in flight while the module is repeatedly unloaded and reloaded, and to fail if a fresh KASAN or oops report appears in `dmesg`.

## Verification

(no test command was executed locally; build and static checks only, the repository CI is authoritative)

## Checklist

- [x] No local test suite was run (the repository CI is authoritative)
- [x] The change is minimal and includes no unrelated files
- [x] The repository contribution guidelines were followed

类型	指派人员	状态
审查	zoucao Huang Cun Jianping Liu	已完成 (0/0人)
测试	Jianping Liu	已完成 (0/0人)

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