ULIMIT: limiting user virtual address space (stack inluded)

[Karaoui mohamed lamine]

Hi all,

According to the man page of "ulimit", it is possible to limit the virtual
address space of a user process: https://ss64.com/bash/ulimit.html
To limit the virtual address space to 2 GB:
$ ulimit -SH -v 1048576

However, it seems that "stack" allocation ignores this limit (I tried with
both kernel 4.4 and 4.15).

I found this article (patch) that seems to fix the problem:
https://lwn.net/Articles/373701/

My questions are:
- Why is the stack allocation not placed within the "ulimit" limit? (is it
a bug?)
- Is there a way, in user space, to force the stack to be allocated at a
certain address?
- Will the patch above (or similar) ever be integrated into the Linux
kernel?

Regards,
Mohamed
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