Comment by asveikau

> across a process boundary

> within a cgroup

Note the complementary language usage here. You seem to have interpreted that as me writing that it didn't matter what cgroup they are in, which is an odd thing to claim that I implied. I meant within the same cgroup obviously.

Yes, you can read memory out of another process through other means.. but you shouldn't map pages, be able to read them and see what happened in another process. That's the wild part. It strikes me as asking for problems.

I was unaware of MAP_UNINITIALIZED, support for which was disabled by default and for good reason. Seems like it was since removed.