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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His response was to implement anti-tamper checks at the JavaScript level. Specifically, he started inspecting his own critical functions using .toString().
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9. WhatFont: Chrome Extension for identifying Any Site FontsWhatFont is a Chrome extension that allows web designers to easily identify and compare different fonts on a page. The first time you use it on any page, WhatFont will copy the selected page.It Uses this page to find out what fonts are present and generate an image that shows all those fonts in different sizes. Besides the apparent websites like Google or Amazon, you'll conjointly use it on sites wherever embedded fonts ar used.
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