Re: [ros-dev] About hotpatchable dlls on ReactOS

[Steven Edwards]

Here is a reimplementation for those that don't want to pay the 10k

http://www.codeproject.com/Articles/44326/MinHook-The-Minimalistic-x86-x64-…

On Fri, Feb 28, 2014 at 7:11 AM, Ged Murphy
<gedmurphy.maillists(a)gmail.com>wrote;wrote:

>   Ahh, the detours trampoline. Hand over £10k to
> Microsoft and you can have
>  their source ;)
>
>
>
>
>
>  *From:* ros-dev-bounces(a)reactos.org [mailto:[e-mail]] *On
>  Behalf Of *Hermès BÉLUSCA - MAÏTO
>  *Sent:* 28 February 2014 14:29
>  *To:* 'ReactOS Development List'
>  *Subject:* Re: [ros-dev] About hotpatchable dlls on ReactOS
>
>
>
>  Not exactly. I'm referring to the fact that, starting with Windows XP sp1
>  (or 2), and in windows 2k3, usual dlls like kernel32, user32 and others
>  (and maybe some exes) have, in the prologue of their exported APIs, two
>  bytes that allows for detouring the API (that allows for in-memory
>  hotpatch). Maybe that it's used when patching a core dll, when you cannot
>  modify its file directly without any reboot (otherwise you would need to
>  reboot for the effects to take change). Here it also appears that some
>  games and some applications try to patch in-memory some of those Apis, and
>  if they cannot, they fail.
>
>
>
>  Searching on wine commits / mailing lists for "hotpatch" and
>  "DECLSPEC_HOTPATCH" (altough that it's something which doesn't exist in
> the
>  PSDK) may give more precision on that subject.
>
>
>
>  Hermes
>
>
>
>  *De :* ros-dev-bounces(a)reactos.org
> [mailto:[e-mail]<[e-mail]>]
>  *De la part de* Ged Murphy
>  *Envoyé :* vendredi 28 février 2014 14:55
>  *À :* 'ReactOS Development List'
>  *Objet :* Re: [ros-dev] About hotpatchable dlls on ReactOS
>
>
>
>  Are you referring to .msp's ?
>
>
>
>  *From:* ros-dev-bounces(a)reactos.org
> [mailto:[e-mail]<[e-mail]>]
>  *On Behalf Of *Hermès BÉLUSCA - MAÏTO
>  *Sent:* 28 February 2014 13:53
>  *To:* ReactOS Development List
>  *Subject:* [ros-dev] About hotpatchable dlls on ReactOS
>
>
>
>  Hi guys !
>
>
>
>  It seems to appear that some games need standard APIs hotpatchable, in the
>  sense of MS: few extra bytes present in the prologue of the functions that
>  allow somebody to detour the API. I knew that this feature was useful for
>  windows updates, but what I didn't know is that there are other programs
>  that use it: see this answer from James on the "Epic Win!" forum thread:
>  http://www.reactos.org/forum/viewtopic.php?f=2&t=10972&p=106823#p10… ,
>  and the following post is something that I've found about this subject, and
>  the fact that Wine already have done something about that.
>
>
>
>  So my question: should we support/create hotpatchable images (of the
>  standard dlls and maybe ?? exes) in ReactOS ? Is it already done ? If not,
>  what needs to be added ? It seems that MSVC and GCC handle that a bit
>  differently.
>
>
>
>  Cheers,
>
>  Hermès BÉLUSCA - MAÏTO
>
>  _______________________________________________
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>  Ros-dev(a)reactos.org
>  http://www.reactos.org/mailman/listinfo/ros-dev
>  


-- 
Steven Edwards

"There is one thing stronger than all the armies in the world, and that is
an idea whose time has come." - Victor Hugo