Deep argument inspection for seccomp

In the Kernel Summit track at the 2019 Linux Plumbers Conference, Christian Brauner and Kees Cook led a discussion on finding a way to do deep argument inspection for seccomp filtering. Currently, seccomp filters can only look at the top-level arguments to a system call, which means that there are use cases that cannot be supported. There was a lively discussion in the session, but no definitive conclusion was reached; various ideas were considered, but none seemed to quite fit the bill.

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