1698951 - Invalid Win32k use in content process [xul!mozilla::mscom::ApartmentRegion::Init+0x8]

Status: RESOLVED INVALID

(Core :: Security: Process Sandboxing, defect, P2)

Description

[Chris Martin [:cmartin] - PTO back Sept 22]

00 0000000e`b7ffe938 00007fff`9c52754e win32u!NtUserRegisterClassExWOW
01 0000000e`b7ffe940 00007fff`9c527349 USER32!RegisterClassExWOWW+0x1f6
02 0000000e`b7ffeca0 00007fff`9b0be158 USER32!RegisterClassW+0x59
03 0000000e`b7ffed30 00007fff`9b00f29b combase!RegisterOleWndClass+0x64 [onecore\com\combase\objact\mainthrd.cxx @ 221] 
04 0000000e`b7ffedd0 00007fff`9b00fa28 combase!ThreadFirstInitialize+0x1fb [onecore\com\combase\class\compobj.cxx @ 3444] 
05 0000000e`b7ffee30 00007fff`9b00f818 combase!_CoInitializeEx+0x1d0 [onecore\com\combase\class\compobj.cxx @ 3745] 
06 0000000e`b7ffef40 00007fff`281570b9 combase!CoInitializeEx+0x58 [onecore\com\combase\class\compobj.cxx @ 3835] 
07 (Inline Function) --------`-------- xul!mozilla::mscom::ApartmentRegion::Init+0x8 [c:\moz\mozilla-central\obj-x86_64-pc-mingw32\dist\include\mozilla\mscom\ApartmentRegion.h @ 47] 
08 0000000e`b7fff1b0 00007fff`2b1fd3ec xul!mozilla::mscom::ProcessRuntime::ProcessRuntime+0x1b9 [c:\moz\mozilla-central\ipc\mscom\ProcessRuntime.cpp @ 123] 
09 (Inline Function) --------`-------- xul!mozilla::mscom::ProcessRuntime::ProcessRuntime+0xf [c:\moz\mozilla-central\obj-x86_64-pc-mingw32\dist\include\mozilla\mscom\ProcessRuntime.h @ 39] 
0a (Inline Function) --------`-------- xul!mozilla::dom::ContentProcess::ContentProcess+0x40 [c:\moz\mozilla-central\obj-x86_64-pc-mingw32\dist\include\mozilla\dom\ContentProcess.h @ 29] 
0b (Inline Function) --------`-------- xul!mozilla::MakeUnique+0x4e [c:\moz\mozilla-central\obj-x86_64-pc-mingw32\dist\include\mozilla\UniquePtr.h @ 609] 
0c 0000000e`b7fff280 00007ff6`48b91597 xul!XRE_InitChildProcess+0x5ec [c:\moz\mozilla-central\toolkit\xre\nsEmbedFunctions.cpp @ 652] 
0d (Inline Function) --------`-------- firefox!content_process_main+0x9d [c:\moz\mozilla-central\ipc\contentproc\plugin-container.cpp @ 57] 

Comment 1

[Bob Owen (:bobowen) (PTO until 17th Oct)]

I think that this might not happen when we have win32k lockdown enabled.
aklotz changed this code to switch on IsWin32LockedDown.

Comment 2

[Chris Martin [:cmartin] - PTO back Sept 22]

Ah, you're right. I don't know why this appeared in my log - I must've accidentally performed a run without Win32k enabled.