ptrace: protect ttools pre-hook against module unload · Pull Request !1887 · OpenCloudOS/OpenCloudOS-Kernel

## Summary

The ptrace pre-hook was stored in an exported plain function pointer, so a task could load the pointer and then be preempted while ttools was unloaded; after rmmod freed the module text, the resumed call could jump into unmapped memory. This change makes the hook RCU-protected: the native and compat syscall paths hold the RCU read lock across dereference and invocation, ttools publishes the hook with rcu_assign_pointer(), and module exit clears it and waits for synchronize_rcu() before teardown can complete. The selftest harness now has a stress mode that repeatedly issues PTRACE_ATTACH while another loop unloads and reloads ttools, then fails if new dmesg output shows a BUG, KASAN report, or Oops.

## 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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