New subject: [Bug 39123] Fairy Fencer F - Large number of FIXME ntdll NtQuerySystemInformation calls

20 Aug 2015


      https://bugs.winehq.org/show_bug.cgi?id=39123
Bug ID: 39123
           Summary: Fairy Fencer F - Large number of FIXME ntdll
                    NtQuerySystemInformation calls
           Product: Wine
           Version: 1.7.49
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: ntdll
          Assignee: wine-bugs@winehq.org
          Reporter: chaos.kagami@gmail.com
      Distribution: ---
Created attachment 52131
  --> https://bugs.winehq.org/attachment.cgi?id=52131
Replaces SYSTEM_INTERRUPT_INFORMATION returning zeroed array with rand() filled
array
The following messages are repeated through the log during gameplay of Fairy
Fencer F, over and over:
fixme:ntdll:NtQuerySystemInformation info_class SYSTEM_INTERRUPT_INFORMATION
fixme:ntdll:NtQuerySystemInformation
(0x00000021,0x5dd43a80,0x00000010,0x6fcdd00) stub
fixme:ntdll:NtQuerySystemInformation
(0x0000002d,0x5dd43a80,0x00000020,0x6fcdd00) stub
Looking through WINE's source, as well as various internet resources -
SYSTEM_INTERRUPT_INFORMATION and another two-ish unimplemented queries can be
used to seed RNG, or just be used as random numbers. Wine returns a zero-filled
array in all of these cases, which results in oddly crippled RNG ranges in
Fairy Fencer F. I've observed a whole battle where every attach hit and as long
as the same attack was used, it did exactly the same damage every time. Also,
in general, the game appears to lack some randomness with these stubs versus
windows. Replacing the zero-filled array with a rand() filled one improves the
situation, but I'm rather sure it isn't what windows does.
A rather hackish patch is attached. The difference in random numbers in-game
should be easily and immediately observable. I'm also aware the patch doesn't
meet submission guidelines - it's not meant to be a real fix. I'm not entirely
sure what the 'correct' fix is.
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[Bug 39123] New: Fairy Fencer F - Large number of FIXME ntdll NtQuerySystemInformation calls