systrace(l) was developed by the OpenBSD project and was introduced to NetBSD starting with version 2.0. It is used to monitor and control an application's access to the operating system by enforcing access policies on system calls. It can be used to protect the system from buffer overflows by restricting a service's access to the operating system. Its privilege escalation feature allows the removal of SUID and SGID binaries by allowing the administrator to specify in the policy the specific system calls that require superuser privilege.
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