This is a well-known browser security technique. In JavaScript, calling .toString() on a native browser function returns "function appendBuffer() { [native code] }". Calling it on a JavaScript function returns the actual source code. So if your appendBuffer has been monkey-patched, .toString() will betray you; it’ll return the attacker’s JavaScript source instead of the expected native code string.
Seccomp-BPF inside the namespace — blocking syscalls like clone3 (preventing nested namespace escape), io_uring (force fallback to epoll), ptrace, kernel module loading
。关于这个话题，safew官方版本下载提供了深入分析
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