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Workaround broken special APC when running x64 on arm64 windows #102333

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merged 2 commits into from
May 16, 2024
Merged

Workaround broken special APC when running x64 on arm64 windows #102333

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841098c
Workaround broken special APC when running x64 on arm64 windows
janvorli May 16, 2024
ceacb65
Make the same fix for NativeAOT
janvorli May 16, 2024
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26 changes: 25 additions & 1 deletion src/coreclr/nativeaot/Runtime/windows/PalRedhawkMinWin.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -30,6 +30,10 @@
#include "thread.h"
#include "threadstore.h"

#ifdef FEATURE_SPECIAL_USER_MODE_APC
#include <versionhelpers.h>
#endif

#define REDHAWK_PALEXPORT extern "C"
#define REDHAWK_PALAPI __stdcall

Expand Down Expand Up @@ -630,12 +634,32 @@ REDHAWK_PALEXPORT void REDHAWK_PALAPI PalHijack(HANDLE hThread, _In_opt_ void* p
_ASSERTE(hThread != INVALID_HANDLE_VALUE);

#ifdef FEATURE_SPECIAL_USER_MODE_APC

// initialize g_pfnQueueUserAPC2Proc on demand.
// Note that only one thread at a time may perform suspension (guaranteed by the thread store lock)
// so simple conditional assignment is ok.
if (g_pfnQueueUserAPC2Proc == QUEUE_USER_APC2_UNINITIALIZED)
{
g_pfnQueueUserAPC2Proc = (QueueUserAPC2Proc)GetProcAddress(LoadKernel32dll(), "QueueUserAPC2");
#ifdef HOST_AMD64
HMODULE hKernel32 = LoadKernel32dll();

typedef BOOL (WINAPI *IsWow64Process2Proc)(HANDLE hProcess, USHORT *pProcessMachine, USHORT *pNativeMachine);

IsWow64Process2Proc pfnIsWow64Process2Proc = (IsWow64Process2Proc)GetProcAddress(hKernel32, "IsWow64Process2");
USHORT processMachine, hostMachine;
if (pfnIsWow64Process2Proc != nullptr &&
(*pfnIsWow64Process2Proc)(GetCurrentProcess(), &processMachine, &hostMachine) &&
(hostMachine == IMAGE_FILE_MACHINE_ARM64) &&
!IsWindowsVersionOrGreater(10, 0, 26100))
{
// Special user-mode APCs are broken on WOW64 processes (x64 running on Arm64 machine) with Windows older than 11.0.26100 (24H2)
g_pfnQueueUserAPC2Proc = NULL;
}
else
#endif // HOST_AMD64
{
g_pfnQueueUserAPC2Proc = (QueueUserAPC2Proc)GetProcAddress(hKernel32, "QueueUserAPC2");
}
}

if (g_pfnQueueUserAPC2Proc)
Expand Down
16 changes: 16 additions & 0 deletions src/coreclr/vm/threads.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -45,6 +45,7 @@

#ifdef FEATURE_SPECIAL_USER_MODE_APC
#include "asmconstants.h"
#include <versionhelpers.h>
#endif

static const PortableTailCallFrame g_sentinelTailCallFrame = { NULL, NULL };
Expand Down Expand Up @@ -8130,6 +8131,21 @@ void Thread::InitializeSpecialUserModeApc()

HMODULE hKernel32 = WszLoadLibrary(WINDOWS_KERNEL32_DLLNAME_W, NULL, LOAD_LIBRARY_SEARCH_SYSTEM32);

#ifdef HOST_AMD64
typedef BOOL (WINAPI *IsWow64Process2Proc)(HANDLE hProcess, USHORT *pProcessMachine, USHORT *pNativeMachine);

IsWow64Process2Proc pfnIsWow64Process2Proc = (IsWow64Process2Proc)GetProcAddress(hKernel32, "IsWow64Process2");
USHORT processMachine, hostMachine;
if (pfnIsWow64Process2Proc != nullptr &&
(*pfnIsWow64Process2Proc)(GetCurrentProcess(), &processMachine, &hostMachine) &&
(hostMachine == IMAGE_FILE_MACHINE_ARM64) &&
!IsWindowsVersionOrGreater(10, 0, 26100))
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{
// Special user-mode APCs are broken on WOW64 processes (x64 running on Arm64 machine) with Windows older than 11.0.26100 (24H2)
return;
}
#endif // HOST_AMD64

// See if QueueUserAPC2 exists
QueueUserAPC2Proc pfnQueueUserAPC2Proc = (QueueUserAPC2Proc)GetProcAddress(hKernel32, "QueueUserAPC2");
if (pfnQueueUserAPC2Proc == nullptr)
Expand Down