[Bug dynamic-link/30007] rfe: dlopen to user buffer or to specified address

["adhemerval.zanella at linaro dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30007

--- Comment #3 from Adhemerval Zanella <adhemerval.zanella at linaro dot org> ---
This seems a very specific usercase that I am not sure if it fits on usual case
of dlopen usage.  Mapping to a preferred address basically defeats ASRL and has
other issues: what this dlopen extension should do if the required mapping is
not large enough, if the address is already occupied, or if the mapping does
not have the correct permissions?

In the case of passing mapping not sufficing and dlopen fallbacks to normal
mapping, the result might not be directly related to the address that was
mapped, so the user will need to call dladdr to check if the mapping was with
the passed buffer or with the fallback mechanism.  So it would be a cumbersome
interface.

We used to have hacks to force mmap to load executables to 32-bits, it was
added to overcome some particular architecture limitations, and it has caused
some issues and it was eventually removed (check
ea5814467a02c9d2d7608b6445c5d60e2a81d3ee).

So I am not very fond of this extension.

-- 
You are receiving this mail because:
You are on the CC list for the bug.