[Bug 47812] Cygwin's strace.exe crashes due to custom TLS corruption

WineHQ Bugzilla wine-bugs at winehq.org
Sat Jun 12 01:16:58 CDT 2021


https://bugs.winehq.org/show_bug.cgi?id=47812

Zebediah Figura <z.figura12 at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Fixed by SHA1|                            |25b093f3845a0ae1b2e2fe1c070
                   |                            |1e98064f8e8d6
          Component|-unknown                    |ntdll
                URL|                            |http://cygwin.com/setup-x86
                   |                            |_64.exe
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED
           Keywords|                            |download

--- Comment #1 from Zebediah Figura <z.figura12 at gmail.com> ---
Today, surprisingly enough, I believe this bug has been fixed. We now have a
separate kernel stack, which means that while Cygwin is still doing something
very fragile, we are no longer touching the stack between DLL attach and thread
initialization, and as a result Cygwin's custom TLS does not get corrupted.

Unfortunately I didn't save the original Cygwin version or command I used to
reproduce this, but I tested with the following and encountered no crashes,
with strace version 3.2.0, echo 8.26, and Cygwin version 2.908.

wine strace.exe --output hello-strace -f echo.exe 'world hello' > hello.out

Fixed by
<https://source.winehq.org/git/wine.git/commitdiff/25b093f3845a0ae1b2e2fe1c0701e98064f8e8d6>
for x86_64, and its parent for i386.

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