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Kernel: Prevent execve/ptrace race

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Add a per-process ptrace lock and use it to prevent ptrace access to a
process after it decides to commit to a new executable in sys$execve().

Fixes #5230.
This commit is contained in:
Andreas Kling 2021-02-08 23:01:53 +01:00
parent 4b7b92c201
commit 4ff0f971f7
3 changed files with 8 additions and 4 deletions
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7
Kernel/Process.h
View file

@ -408,10 +408,8 @@ public:
return m_thread_count.load(AK::MemoryOrder::memory_order_relaxed);
}
Lock& big_lock()
{
return m_big_lock;
}
Lock& big_lock() { return m_big_lock; }
Lock& ptrace_lock() { return m_ptrace_lock; }
Custody& root_directory();
Custody& root_directory_relative_to_global_root();
@ -579,6 +577,7 @@ private:
size_t m_master_tls_alignment { 0 };
Lock m_big_lock { "Process" };
Lock m_ptrace_lock { "ptrace" };
RefPtr<Timer> m_alarm_timer;