[Bug 32515] Steam games protected with Valve's CEG ( Custom Executable Generation) DRM scheme fail game cache validation

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=32515

Michael Müller <michael at fds-team.de> changed:

           What    |Removed                     |Added
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                 CC|                            |michael at fds-team.de

--- Comment #85 from Michael Müller <michael at fds-team.de> ---
Yes, I have tested it on all three platforms my self. For more information:
https://dev.wine-staging.com/patches/105/

It could be a bug in the Linux Kernel. The breakpoints are explicitly cleared
in [1], but the dr6/dr7 registers [2] are copied as part of the memcpy in
[3]->[4]->[5]. Anyway, this does not really matter from my point of view. Even
if this is considered as a bug and gets fixed today, it would take a long time
till every one uses a recent enough kernel. On FreeBSD the behavior of copying
all registers might even be intentional. After all, this is a design decision
of the operating system and there is no right or wrong solution. So, we might
need this code anyway, even if it has a small effect on the performance, unless
AJ would like to keep this bug (i.e. the wrong register values) unfixed. We
could add an #ifndef __APPLE__ though, if the behavior is consistent across all
OS X versions.

[1]
http://elixir.free-electrons.com/linux/latest/source/arch/x86/kernel/process_64.c#L170
[2]
http://elixir.free-electrons.com/linux/latest/source/arch/x86/include/asm/processor.h#L450
[3] http://elixir.free-electrons.com/linux/latest/source/kernel/fork.c#L1551
[4] http://elixir.free-electrons.com/linux/latest/source/kernel/fork.c#L505
[5]
http://elixir.free-electrons.com/linux/latest/source/arch/x86/kernel/process.c#L81

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