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.
变化二：存储器需求，正在分层周期失灵的背后，是存储芯片需求端的结构性重塑。
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The flight from Mendoza to Santiago is the bumpiest in the world by that measure. It has an average E.D.R. of .23. That’s nearly a third higher than the most turbulent routes in North America—from Denver to Jackson Hole and from Albuquerque to Denver—but still far from severe. On a Boeing 737, Cornman told me, an E.D.R. of .23 would register as moderate turbulence—“uncomfortable, especially for long periods, but people won’t hit the ceiling.” Then again, averages can be deceptive. A roller coaster might average only fifteen miles an hour if you include the slow climb up the hill. But that first drop is all you remember.
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