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Add note on heap sharing.

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JF Bastien
2016-02-01 08:04:53 -08:00
parent acc1d6453b
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@@ -150,6 +150,14 @@ stacks. libc's `malloc` would then use this basic memory manager to implement
runtime memory management, the same would be true for stack positioning, thread
stacks, and thread-local storage allocation.
Interesting applications can be built when modules *don't* share the same
heap. They need to communicate through copy-in / copy-out functionality (such as
Linux' `copy_from_user` / `copy_to_user` functions), and are then entirely
isolated from each other except for their API boundary. This allows applications
to instantiate their heap in a private closure and only expose APIs, providing
good isolation properties and preventing user code from overflow and other
security issues.
## Why do dynamic linking now?
These basic experiments are finding bugs in the toolchain, if anything they're