1.1 环境初探：Ling Studio
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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And avoid sending videos or files that are very large, because “nobody likes to saturate the memory of their smartphone or waste their data/internet plan on nonsense,” its guidance says. The club did not respond to a request for comment.
“一些边缘户本来就晃晃悠悠，稍遇到点风险变故马上就可能致贫”，习近平总书记语重心长。