New subject: [Bug 46965] Stack overflow handling not working on x86_64

5 Apr 2019


      https://bugs.winehq.org/show_bug.cgi?id=46965
Bug ID: 46965
           Summary: Stack overflow handling not working on x86_64
           Product: Wine
           Version: 4.4
          Hardware: x86
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: kernel32
          Assignee: wine-bugs@winehq.org
          Reporter: elpochodelagente@gmail.com
      Distribution: ---
Created attachment 64118
  --> https://bugs.winehq.org/attachment.cgi?id=64118
stack overflow handling test case
The exception handler for stack overflows tries to use so much stack that it
passes the guard page, causes a second stack overflow, and results in a fatal
error. We found that this problem occurs in 64 bits but not in 32 bits, I guess
because the 64-bit processor contexts are much fatter.
Our use case involves setting up a vectored interrupt handler, so that the
stack overflow can be trapped and handled to continue doing something else. We
didn't try using a structured exception handler.
We were not sure of how to fix the problem as the root of the crash is too much
use of the stack, which the compiler owns. I was wondering if it was possible
to put the contexts in the heap, but wasn't sure as there might be restrictions
to  exception handling code which I'm not aware of.
I attach a test case which works in 32-bits, and doesn't work in 64-bits.
$> i686-w64-mingw32-gcc -o stack-overflow-32.exe stack-overflow-1.c
$> wine stack-overflow-32.exe 
exception! c00000fd
stack overflow
$> x86_64-w64-mingw32-gcc -o stack-overflow-64.exe stack-overflow-1.c 
$> wine stack-overflow-64.exe 
01ff:err:seh:setup_exception stack overflow 1552 bytes in thread 01ff eip
00007f3941e7a219 esp 0000000000131000 stack 0x130000-0x131000-0x330000
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[Bug 46965] New: Stack overflow handling not working on x86_64