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The Sentry intercepts the untrusted code’s syscalls and handles them in user-space. It reimplements around 200 Linux syscalls in Go, which is enough to run most applications. When the Sentry actually needs to interact with the host to read a file, it makes its own highly restricted set of roughly 70 host syscalls. This is not just a smaller filter on the same surface; it is a completely different surface. The failure mode changes significantly. An attacker must first find a bug in gVisor’s Go implementation of a syscall to compromise the Sentry process, and then find a way to escape from the Sentry to the host using only those limited host syscalls.
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Steve O'Farrell has been able to exercise for the first time in years
12月15日上午，众多剧迷粉丝冒着严寒赶到北京昌平殡仪馆久安厅，送别演员何晴最后一程。12月13日，这位被誉为“古典第一美人”的演员因病去世，终年61岁。