Mail Archives: cygwin/2025/01/22/16:59:41

Whitney Schmidt via Cygwin <cygwin AT cygwin DOT com> · Wed, 22 Jan 2025 21:59:05 +0000

--_004_PH0PR21MB134382D4A79602A85A7FA363CBE12PH0PR21MB1343namp_
Content-Type: text/plain; charset="Windows-1252"
Content-Transfer-Encoding: quoted-printable

Hi Cygwin list,

Replying to this email to let you know that we've sent updated information =
on the proposed changes to cygwin-developers, including a patch, which we'v=
e also sent to cygwin-patches.
The patch replaces the following undocumented API calls with the correspond=
ing documented APIs:

  *   NtOpenJobObject - OpenJobObjectA<https://learn.microsoft.com/en-us/wi=
ndows/win32/api/winbase/nf-winbase-openjobobjecta>
  *   NtCreateJobObject - CreateJobObjectA<https://learn.microsoft.com/en-u=
s/windows/win32/api/winbase/nf-winbase-createjobobjecta>
  *   NtQueryInformationJobObject - QueryInformationJobObject<https://learn=
.microsoft.com/en-us/windows/win32/api/jobapi2/nf-jobapi2-queryinformationj=
obobject>
  *   NtSetInformationJobObject - SetInformationJobObject<https://learn.mic=
rosoft.com/en-us/windows/win32/api/jobapi2/nf-jobapi2-setinformationjobobje=
ct>
  *
NTAssignProcessToJobObject - AssignProcessToJobObject<https://learn.microso=
ft.com/en-us/windows/win32/api/jobapi2/nf-jobapi2-assignprocesstojobobject>

-Whitney

She/Her/Hers

________________________________
From: Veronica Giaudrone <Veronica DOT Giaudrone AT microsoft DOT com>
Sent: Friday, January 10, 2025 9:25 PM
To: cygwin AT cygwin DOT com <cygwin AT cygwin DOT com>
Cc: Whitney Schmidt <whschm AT microsoft DOT com>; Sebastian Hernandez <sebhernand=
ez AT microsoft DOT com>
Subject: [Bug check/report] UnDocumented call to ntdll.dll!NtAssignProcessT=
oJobObject in msys2.0.dll / cygwin - included in mingit/Git for Windows

Hello Cygwin list,

I=92m part of the Visual Studio team at Microsoft which includes mingit/Git=
 for Windows in our product for Git tooling integration (I=92m copying a co=
uple of folks from my team in this email too). One of our API scanning tool=
s has identified msys2.0.dll calling undocumented Windows APIs like ntdll.d=
ll!NtAssignProcessToJobObject:

  *   In cygwin - https://github.com/search?q=3Drepo%3Acygwin%2Fcygwin+NtAs=
signProcessToJobObject&type=3Dcode with a caller: cygwin/winsup/cygwin/reso=
urce.cc at 21a2c9db6952954608cdf92638b411b15e7606c6 =B7 cygwin/cygwin<https=
://github.com/cygwin/cygwin/blob/21a2c9db6952954608cdf92638b411b15e7606c6/w=
insup/cygwin/resource.cc#L246>
     *   Looks like it was introduced ~3 years ago: https://github.com/cygw=
in/cygwin/commit/1c7384f9d1b692c8b58af4db8c81d2ce0b10ad06#diff-bc84d57ac999=
58a694cb56b977bac1360e35040f9aa421972702219e11055ae8R290
     *   The code indicates to have come from oneTBB/test/tbbmalloc/test_ma=
lloc_compliance.cpp at bd291eb0d1c7f802ca5081a8755562ab786db2a2 =B7 uxlfoun=
dation/oneTBB<https://github.com/uxlfoundation/oneTBB/blob/bd291eb0d1c7f802=
ca5081a8755562ab786db2a2/test/tbbmalloc/test_malloc_compliance.cpp#L56-L78>=
, though in that case the usage is of the documented API instead.

We believe the above call should get replaced by the following documented A=
PI - AssignProcessToJobObject function (jobapi2.h) - Win32 apps | Microsoft=
 Learn<https://learn.microsoft.com/en-us/windows/win32/api/jobapi2/nf-jobap=
i2-assignprocesstojobobject>

Are you aware of this undocumented API call or a reason to not attempt upda=
ting them to documented ones?

The scan identified a few others like:

  *   NtOpenJobObject
  *   NtCreateJobObject
  *   NtOpenMutant =96 we=92re not sure yet of the documented call for this=
 one.
  *   NtQueryInformationJobObject
  *   NtSetInformationJobObject

We need to further investigate as the documented calls may not be identical=
.

I would appreciate any thoughts/feedback or pointing us on the right direct=
ion. My team would be looking into proposing a change if the above sounds r=
easonable to this list.

Thanks,

Veronica

--_004_PH0PR21MB134382D4A79602A85A7FA363CBE12PH0PR21MB1343namp_
Content-Type: application/octet-stream;
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Content-Description: 0001-replace-undocumented-Nt-calls-with-documented-win32-
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Content-Disposition: attachment;
	filename="0001-replace-undocumented-Nt-calls-with-documented-win32- 1.patch";
	size=7663; creation-date="Wed, 22 Jan 2025 21:55:38 GMT";
	modification-date="Wed, 22 Jan 2025 21:56:02 GMT"
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CC:	Sebastian Hernandez <sebhernandez AT microsoft DOT com>,
	Veronica Giaudrone
	<Veronica DOT Giaudrone AT microsoft DOT com>
Subject:	Re: [Bug check/report] UnDocumented call to
	ntdll.dll!NtAssignProcessToJobObject in msys2.0.dll / cygwin - included in
	mingit/Git for Windows
Thread-Topic:	[Bug check/report] UnDocumented call to
	ntdll.dll!NtAssignProcessToJobObject in msys2.0.dll / cygwin - included in
	mingit/Git for Windows
Thread-Index:	Adtjz7Dcw6j7xJUNQkiXzhJq8xXTeAJSGVQP
Date:	Wed, 22 Jan 2025 21:59:05 +0000
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