Use user permissions on socket handles#94
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Passing an invalid timeout capability currently crashes the network stack (which is really annoying as it triggers a reset). Signed-off-by: Hugo Lefeuvre <hugo.lefeuvre@ubc.ca>
Signed-off-by: Hugo Lefeuvre <hugo.lefeuvre@ubc.ca>
Similar to what we recently did in the allocator and in the message queue, we can use the three currently-unused bits at the bottom of sealed socket handles to store permissions. Having permissions on sockets allows us to encode the right to close a socket, send, or receive data. Signed-off-by: Hugo Lefeuvre <hugo.lefeuvre@ubc.ca>
This extends the HTTP server example to showcase socket and allocator capability permissions. We can also use that example later to showcase sub-quotas. Signed-off-by: Hugo Lefeuvre <hugo.lefeuvre@ubc.ca>
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This addresses #91. While at it, it adds some missing documentation (which I realized while documenting the feature), and adds a missing check (which I found out while adding the permission checks).
This comes with a new example to showcase the use of least-privilege socket handles.