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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While Stanton collected a promising cast for his film, the reviews out of its Sundance debut were bleak. And we can confirm, this movie is a mess. Imagine Black Mirror without nuance or Cloud Atlas without ambition, and you'll have some idea. The Neanderthal plot, which features no modern dialogue, is the most impactful thread. The rest is confounding and bland. — Kristy Puchko, Entertainment Editor
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