That's one way to do it, dealing with linkers was really not my thing so I just get the mapped memory list [1] and set it as the start pivot then stack pages on top of it [2]. Thankfully the brk heap isn't intrusive enough to climb up into the pages I allocated :) (this is actually why Linux' MAP_32BIT mmap starts from 0x40000000 [3], but I didn't like how high it was and made it dynamic)
Thanks for the information, I wasn't aware of that! Seems like it's not available on FreeBSD though ;( I want to support as many OS'es as possible, but I'll still add a comment on that for future reference.
Yeah, I could just use that flag on Linux and let the kernel do more work but I'm afraid I might have to add more logic for looping for a failed mmap only for linux, and more ifdefs usually mean I'm doing something wrong. I'd rather roll with my current strategy (finding a safe pivot and keep bumping without checking anything)
That seems about right[1], but the MAP_FIXED_NOREPLACE flag has been a thing since Linux 4.17. What about using that?
[1]: https://godbolt.org/z/698dPcvf6