Re: [PATCH for-8.1 v10 01/14] linux-user: Adjust task_unmapped_base for reserved_va

[Richard Henderson]

On 8/8/23 02:10, Alex Bennée wrote:
> One thing I'm slightly confused by is the ELF_ET_DYN_BASE can be above
> this (or sometimes the same). Should the mapping of ELF segments be
> handled with mmap_next_start? I assume once mmap_next_start meets the
> mappings for the ELF segments we skip over until we get to more free
> space after the program code?

ELF_ET_DYN_BASE is a hack imported from the kernel to put separation between an ET_DYN 
main binary and TASK_UNMAPPED_BASE, so that the brk can follow the binary and have space 
to grow.

All of this is part of the "legacy" memory layout, for which there is a 
personality flag.

For 8.2, I think we should work on implementing the "new" memory layout, which places 
everything top-down.  But most importantly it completely separates brk from the binary.


r~