Allocating Executable Memory

[Alex Rønne Petersen]

On 31-07-2012 20:30, Era Scarecrow wrote:
> On Tuesday, 31 July 2012 at 17:23:08 UTC, Maxime Chevalier wrote:
>> New to the D language here. I'm working on a tracing JIT compiler and
>> will need to allocate chunks of memory that are marked as executable.
>>
>> Is there a standard way of doing this in D, or do I need to directly
>> call into mprotect? If I'm going to be calling mprotect, what's the
>> cleanest way to do that, do I need to declare my own prototype for the
>> function and its flags, or should I write some C code that does the call?
>
>   The x86 chip it's a simple flag that the OS can set. For use with like
> UPX, the whole section is marked read, write & execute I believe (since
> it has to expand it first before it can execute the code; That is of
> course for loaded memory, not allocating...). I would say check their
> sources, may prove interesting.

UPX simply uses VirtualProtect/mprotect. It's the only way you _can_ do 
this in ring 3 on any OS with sane security.

-- 
Alex Rønne Petersen
alex at lycus.org
http://lycus.org