New subject: [Bug 49973] 64-bit Cheat Engine does not properly handle 32-bit processes

10 Oct 2020

      https://bugs.winehq.org/show_bug.cgi?id=49973

            Bug ID: 49973
           Summary: 64-bit Cheat Engine does not properly handle 32-bit
                    processes
           Product: Wine
           Version: 5.4
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: wine-bugs(a)winehq.org
          Reporter: subgraph93(a)gmail.com
      Distribution: ---

Created attachment 68374
  --> https://bugs.winehq.org/attachment.cgi?id=68374
cheatengine-x86_64.exe attaching to Tutorial-i386.exe

Distribution: Ubuntu 20.04
Program download: Cheat Engine 7.1, available from
https://cheatengine.org/downloads.php (the actual link appears to change on
every page refresh)
Program source code: available at https://github.com/cheat-engine/cheat-engine/

On Windows 7, 64-bit Cheat Engine (cheatengine-x86_64.exe) works fine for
32-bit processes as well as 64-bit processes. However, when using Wine, 64-bit
CE cannot properly attach to 32-bit processes. 32-bit CE works fine for 32-bit
processes. Explaining in some more detail below.

To attach CE to a program, start CE and the program (in any order), then when
CE opens, click the "Open process" icon (it looks like a desktop monitor with a
magnifying glass; it's below the "File" menu button) and select the target
process from the list. CE comes with its own tutorial programs (32-bit and
64-bit), so installing another, unrelated program shouldn't be needed for
testing.

A simple way to identify whether the issue exists is to add an address using
the executable name. To do this, click the "Add Address Manually" button in CE,
enter ["programname.exe"] (with the square brackets; e. g.
["Tutorial-i386.exe"]) in the "Address" box, then click OK. Note the new entry
in the address list below and check the value in the "Address" column for that
entry. When using 32-bit CE on a 32-bit program, the address column shows the
actual address (e. g. 00905A4D) and may show a value, but when using 64-bit CE
on a 32-bit program (something that works on Windows), the address column shows
the text with the program name – something like (["Tutorial-i386.exe"]), with
the parentheses, – and the value is just question marks.

The most obvious impact of the issue is that cheat tables and assembly scripts
cannot work unless the base address (is this the right term?) of the .exe is
hardcoded. Other problems with using 64-bit CE on 32-bit programs are that the
code finder does not work (so you can't complete Step 5 of the tutorial, which
requires you to overwrite an instruction that changes a value; you can't find
that instruction), and that pointer scans do not work. (I'll file other tickets
if these turn out to be their own issues; but both features work fine if 32-bit
CE is used on a 32-bit process.)

I set the version as 5.4 because it's the first version I noticed this issue
in. This issue was also present in every newer version up to 5.19 (both devel
and staging channels). I don't think it's a regression. I didn't use Cheat
Engine with Wine versions before 5.4.

Attached the terminal output for the 5.19-staging test with 64-bit CE and the
32-bit tutorial.

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[Bug 49973] New: 64-bit Cheat Engine does not properly handle 32-bit processes

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