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Kernel: Guard Process "protected data" with a spinlock
This ensures that both mutable and immutable access to the protected data of a process is serialized. Note that there may still be multiple TOCTOU issues around this, as we have a bunch of convenience accessors that make it easy to introduce them. We'll need to audit those as well.
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11 changed files with 348 additions and 300 deletions
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@ -17,8 +17,9 @@ ErrorOr<FlatPtr> Process::sys$disown(ProcessID pid)
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return ESRCH;
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if (process->ppid() != this->pid())
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return ECHILD;
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ProtectedDataMutationScope scope(*process);
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process->m_protected_values.ppid = 0;
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process->with_mutable_protected_data([](auto& protected_data) {
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protected_data.ppid = 0;
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});
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process->disowned_by_waiter(*this);
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return 0;
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}
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