Kernel: Reset FPU state on exec()

Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/9aa234cc475

Kernel/Process.cpp

@@ -992,6 +992,7 @@ int Process::do_exec(NonnullRefPtr<FileDescription> main_program_description, Ve
     m_master_tls_alignment = master_tls_alignment;
 
     new_main_thread->make_thread_specific_region({});
+    new_main_thread->reset_fpu_state();
 
     memset(&tss, 0, sizeof(TSS32));
     tss.iomapbase = sizeof(TSS32);

Kernel/Thread.cpp

@@ -94,7 +94,7 @@ Thread::Thread(Process& process)
 #endif
     set_default_signal_dispositions();
     m_fpu_state = (FPUState*)kmalloc_aligned(sizeof(FPUState), 16);
-    memcpy(m_fpu_state, &s_clean_fpu_state, sizeof(FPUState));
+    reset_fpu_state();
     memset(&m_tss, 0, sizeof(m_tss));
     m_tss.iomapbase = sizeof(TSS32);
 
@@ -879,4 +879,9 @@ Thread* Thread::from_tid(int tid)
     return found_thread;
 }
 
+void Thread::reset_fpu_state()
+{
+    memcpy(m_fpu_state, &s_clean_fpu_state, sizeof(FPUState));
+}
+
 }

Kernel/Thread.h

@@ -440,8 +440,9 @@ private:
     friend class WaitQueue;
     bool unlock_process_if_locked();
     void relock_process();
-
     String backtrace_impl() const;
+    void reset_fpu_state();
+
     Process& m_process;
     int m_tid { -1 };
     TSS32 m_tss;