Is there a way to share memory between unrelated processes in Linux?

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it depends, I think, on how much these unrelated processes are willing to work together.

If you control one process and not the other, you can brute-force something with root privs and ptrace or reading and writing memory directly.

If you control both processes, you may be able to set something up with shmget or shm_open, which both return fds that can be passed to mmap, etc.

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