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Create a whitelist of commands which HHVM may execute
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If we were to set hhvm.server.whitelist_exec = true, HHVM would only allow shelling out to whatever commands we specify are permissible in hhvm.server.allowed_exec_cmds. This seems like a good security feature, so we should use it.

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ori assigned this task to csteipp.
ori raised the priority of this task from to Low.
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ori added a project: Security-Core.
ori added a subscriber: ori.

That makes a lot of sense to me. Do we have enough logging in production that we would spot violations if we missed a legitimate command?

Aklapper added a subscriber: csteipp.
MaxSem added a subscriber: MaxSem.

We're ditching HHVM soon.