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.
After their youngest child started school last September, he set up a consultancy that he works on during school hours.
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Programmable keys
第七十一条 有下列行为之一的，处一千元以上三千元以下罚款；情节严重的，处五日以上十日以下拘留，并处一千元以上三千元以下罚款：