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bug#27527: 25.2; start-process crash on Windows with 64bit .NET executab

From: Saulius Menkevičius
Subject: bug#27527: 25.2; start-process crash on Windows with 64bit .NET executable
Date: Thu, 29 Jun 2017 19:10:00 +0300


Here it is:

Attachment: windows-x64-dotnet-exe-crash-fix-b.patch
Description: Binary data

> Am 29.06.2017 um 17:24 schrieb Eli Zaretskii <address@hidden>:
>> From: Saulius Menkevičius <address@hidden>
>> Date: Thu, 29 Jun 2017 12:41:55 +0300
>> The issue was encountered when debugging a problem with omnisharp-emacs
>> package where starting a server process (written for and running in a  
>> crashes emacs with a segfault.
>> Recompiling with -g -O0 has revealed a problem in implementation of
>> w32_executable_type in src/w32proc.c where the code is attempting to list
>> DLL imports in a binary but the import table points to NULL. This code works 
>> for
>> .NET binaries compiled for x86 so the problem is specific to 64 bit Windows 
>> / .NET DLLs.
>> The callstack of a crash is below and I have a patch attached that fixes the 
>> problem. 
>> The patch applies cleanly to both master and emacs-25 branches.
> Thanks.
> Can you send the diffs generated with the -b switch?  I think all you
> did was to condition the use of the import directory on its being
> non-NULL, but it's hard to tell judging just by the diffs you posted.

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