-
-/**
- * seccomp_phase2() - finish slow path seccomp work for the current syscall
- * @phase1_result: The return value from seccomp_phase1()
- *
- * This must be called from a context in which ptrace hooks can be used.
- *
- * Returns 0 if the syscall should be processed or -1 to skip the syscall.
- */
-int seccomp_phase2(u32 phase1_result)
-{
- struct pt_regs *regs = task_pt_regs(current);
- u32 action = phase1_result & SECCOMP_RET_ACTION;
- int data = phase1_result & SECCOMP_RET_DATA;
-
- BUG_ON(action != SECCOMP_RET_TRACE);
-
- audit_seccomp(syscall_get_nr(current, regs), 0, action);
-
- /* Skip these calls if there is no tracer. */
- if (!ptrace_event_enabled(current, PTRACE_EVENT_SECCOMP)) {
- syscall_set_return_value(current, regs,
- -ENOSYS, 0);
- return -1;
- }
-
- /* Allow the BPF to provide the event message */
- ptrace_event(PTRACE_EVENT_SECCOMP, data);
- /*
- * The delivery of a fatal signal during event
- * notification may silently skip tracer notification.
- * Terminating the task now avoids executing a system
- * call that may not be intended.
- */
- if (fatal_signal_pending(current))
- do_exit(SIGSYS);
- if (syscall_get_nr(current, regs) < 0)
- return -1; /* Explicit request to skip. */
-
- return 0;
-}