Kernel: Move process signal trampoline address into protected data

Kernel/Process.h

@@ -118,6 +118,7 @@ protected:
     bool m_has_execpromises { false };
     u32 m_execpromises { 0 };
     mode_t m_umask { 022 };
+    VirtualAddress m_signal_trampoline;
 };
 
 class ProcessBase : public ProtectedProcessBase {
@@ -544,7 +545,6 @@ private:
     String m_name;
 
     OwnPtr<Space> m_space;
-    VirtualAddress m_signal_trampoline;
 
     RefPtr<ProcessGroup> m_pg;
 

Kernel/Syscalls/execve.cpp

@@ -530,7 +530,6 @@ KResult Process::do_exec(NonnullRefPtr<FileDescription> main_program_description
     }
 
     signal_trampoline_region.value()->set_syscall_region(true);
-    m_signal_trampoline = signal_trampoline_region.value()->vaddr();
 
     m_executable = main_program_description->custody();
     m_arguments = arguments;
@@ -605,6 +604,8 @@ KResult Process::do_exec(NonnullRefPtr<FileDescription> main_program_description
         m_execpromises = 0;
         m_has_execpromises = false;
 
+        m_signal_trampoline = signal_trampoline_region.value()->vaddr();
+
         // FIXME: PID/TID ISSUE
         m_pid = new_main_thread->tid().value();
     }

Kernel/Syscalls/fork.cpp

@@ -44,7 +44,6 @@ KResultOr<pid_t> Process::sys$fork(RegisterState& regs)
     child->m_veil_state = m_veil_state;
     child->m_unveiled_paths = m_unveiled_paths.deep_copy();
     child->m_fds = m_fds;
-    child->m_signal_trampoline = m_signal_trampoline;
     child->m_pg = m_pg;
 
     {
@@ -56,6 +55,7 @@ KResultOr<pid_t> Process::sys$fork(RegisterState& regs)
         child->m_sid = m_sid;
         child->m_extra_gids = m_extra_gids;
         child->m_umask = m_umask;
+        child->m_signal_trampoline = m_signal_trampoline;
     }
 
     dbgln_if(FORK_DEBUG, "fork: child={}", child);