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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England’s pursuit of a target of 160 was appearing increasingly forlorn until its 18th over, bowled by Glenn Phillips, which started with them needing an improbable 43 off 18 and ended, two sixes and a couple of fours later, with a manageable 21 required off 12. Ahmed started the next with another boundary to keep the momentum going and before the penultimate delivery the batters conferred. “I said: ‘I’ll get a single and you just have a free hit,’” Jacks said; he got his single and Ahmed deposited the final delivery into the stands. “That six pretty much won us the game,” said Jacks.