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reactos/base/system/smss/smss.c
Hermès Bélusca-Maïto f766ca5e42
[SMSS] Use NULL for NULL pointers.
2021-11-22 00:16:32 +01:00

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/*
* PROJECT: ReactOS Windows-Compatible Session Manager
* LICENSE: BSD 2-Clause License
* FILE: base/system/smss/smss.c
* PURPOSE: Main SMSS Code
* PROGRAMMERS: Alex Ionescu
*/
/* INCLUDES *******************************************************************/
#include "smss.h"
#include <pseh/pseh2.h>
#define NDEBUG
#include <debug.h>
/* GLOBALS ********************************************************************/
UNICODE_STRING SmpSystemRoot;
ULONG AttachedSessionId = -1;
BOOLEAN SmpDebug, SmpEnableDots;
HANDLE SmApiPort;
HANDLE SmpInitialCommandProcessId;
/* FUNCTIONS ******************************************************************/
/* GCC's incompetence strikes again */
VOID
sprintf_nt(IN PCHAR Buffer,
IN PCHAR Format,
IN ...)
{
va_list ap;
va_start(ap, Format);
sprintf(Buffer, Format, ap);
va_end(ap);
}
NTSTATUS
NTAPI
SmpExecuteImage(IN PUNICODE_STRING FileName,
IN PUNICODE_STRING Directory,
IN PUNICODE_STRING CommandLine,
IN ULONG MuSessionId,
IN ULONG Flags,
IN PRTL_USER_PROCESS_INFORMATION ProcessInformation)
{
PRTL_USER_PROCESS_INFORMATION ProcessInfo;
NTSTATUS Status;
RTL_USER_PROCESS_INFORMATION LocalProcessInfo;
PRTL_USER_PROCESS_PARAMETERS ProcessParameters;
/* Use the input process information if we have it, otherwise use local */
ProcessInfo = ProcessInformation;
if (!ProcessInfo) ProcessInfo = &LocalProcessInfo;
/* Create parameters for the target process */
Status = RtlCreateProcessParameters(&ProcessParameters,
FileName,
SmpDefaultLibPath.Length ?
&SmpDefaultLibPath : NULL,
Directory,
CommandLine,
SmpDefaultEnvironment,
NULL,
NULL,
NULL,
0);
if (!NT_SUCCESS(Status))
{
/* This is a pretty bad failure. ASSERT on checked builds and exit */
ASSERTMSG("RtlCreateProcessParameters failed.\n", NT_SUCCESS(Status));
DPRINT1("SMSS: RtlCreateProcessParameters failed for %wZ - Status == %lx\n",
FileName, Status);
return Status;
}
/* Set the size field as required */
ProcessInfo->Size = sizeof(RTL_USER_PROCESS_INFORMATION);
/* Check if the debug flag was requested */
if (Flags & SMP_DEBUG_FLAG)
{
/* Write it in the process parameters */
ProcessParameters->DebugFlags = 1;
}
else
{
/* Otherwise inherit the flag that was passed to SMSS itself */
ProcessParameters->DebugFlags = SmpDebug;
}
/* Subsystems get the first 1MB of memory reserved for DOS/IVT purposes */
if (Flags & SMP_SUBSYSTEM_FLAG)
{
ProcessParameters->Flags |= RTL_USER_PROCESS_PARAMETERS_RESERVE_1MB;
}
/* And always force NX for anything that SMSS launches */
ProcessParameters->Flags |= RTL_USER_PROCESS_PARAMETERS_NX;
/* Now create the process */
Status = RtlCreateUserProcess(FileName,
OBJ_CASE_INSENSITIVE,
ProcessParameters,
NULL,
NULL,
NULL,
FALSE,
NULL,
NULL,
ProcessInfo);
RtlDestroyProcessParameters(ProcessParameters);
if (!NT_SUCCESS(Status))
{
/* If we couldn't create it, fail back to the caller */
DPRINT1("SMSS: Failed load of %wZ - Status == %lx\n",
FileName, Status);
return Status;
}
/* Associate a session with this process */
Status = SmpSetProcessMuSessionId(ProcessInfo->ProcessHandle, MuSessionId);
/* If the application is deferred (suspended), there's nothing to do */
if (Flags & SMP_DEFERRED_FLAG) return Status;
/* Otherwise, get ready to start it, but make sure it's a native app */
if (ProcessInfo->ImageInformation.SubSystemType == IMAGE_SUBSYSTEM_NATIVE)
{
/* Resume it */
NtResumeThread(ProcessInfo->ThreadHandle, NULL);
if (!(Flags & SMP_ASYNC_FLAG))
{
/* Block on it unless Async was requested */
NtWaitForSingleObject(ProcessInfo->ThreadHandle, FALSE, NULL);
}
/* It's up and running now, close our handles */
NtClose(ProcessInfo->ThreadHandle);
NtClose(ProcessInfo->ProcessHandle);
}
else
{
/* This image is invalid, so kill it, close our handles, and fail */
Status = STATUS_INVALID_IMAGE_FORMAT;
NtTerminateProcess(ProcessInfo->ProcessHandle, Status);
NtWaitForSingleObject(ProcessInfo->ThreadHandle, 0, 0);
NtClose(ProcessInfo->ThreadHandle);
NtClose(ProcessInfo->ProcessHandle);
DPRINT1("SMSS: Not an NT image - %wZ\n", FileName);
}
/* Return the outcome of the process create */
return Status;
}
NTSTATUS
NTAPI
SmpInvokeAutoChk(IN PUNICODE_STRING FileName,
IN PUNICODE_STRING Directory,
IN PUNICODE_STRING Arguments,
IN ULONG Flags)
{
ANSI_STRING MessageString;
CHAR MessageBuffer[256];
UNICODE_STRING Destination;
WCHAR Buffer[1024];
BOOLEAN BootState, BootOkay, ShutdownOkay;
/* Check if autochk should show dots (if the user booted with /SOS) */
if (SmpQueryRegistrySosOption()) SmpEnableDots = FALSE;
/* Make sure autochk was actually found */
if (Flags & SMP_INVALID_PATH)
{
/* It wasn't, so create an error message to print on the screen */
sprintf_nt(MessageBuffer,
"%wZ program not found - skipping AUTOCHECK\r\n",
FileName);
RtlInitAnsiString(&MessageString, MessageBuffer);
if (NT_SUCCESS(RtlAnsiStringToUnicodeString(&Destination,
&MessageString,
TRUE)))
{
/* And show it */
NtDisplayString(&Destination);
RtlFreeUnicodeString(&Destination);
}
}
else
{
/* Autochk is there, so record the BSD state */
BootState = SmpSaveAndClearBootStatusData(&BootOkay, &ShutdownOkay);
/* Build the path to autochk and place its arguments */
RtlInitEmptyUnicodeString(&Destination, Buffer, sizeof(Buffer));
RtlAppendUnicodeStringToString(&Destination, FileName);
RtlAppendUnicodeToString(&Destination, L" ");
RtlAppendUnicodeStringToString(&Destination, Arguments);
/* Execute it */
SmpExecuteImage(FileName,
Directory,
&Destination,
0,
Flags & ~SMP_AUTOCHK_FLAG,
NULL);
/* Restore the BSD state */
if (BootState) SmpRestoreBootStatusData(BootOkay, ShutdownOkay);
}
/* We're all done! */
return STATUS_SUCCESS;
}
NTSTATUS
NTAPI
SmpExecuteCommand(IN PUNICODE_STRING CommandLine,
IN ULONG MuSessionId,
OUT PHANDLE ProcessId,
IN ULONG Flags)
{
NTSTATUS Status;
UNICODE_STRING Arguments, Directory, FileName;
/* There's no longer a debugging subsystem */
if (Flags & SMP_DEBUG_FLAG) return STATUS_SUCCESS;
/* Parse the command line to see what execution flags are requested */
Status = SmpParseCommandLine(CommandLine,
&Flags,
&FileName,
&Directory,
&Arguments);
if (!NT_SUCCESS(Status))
{
/* Fail if we couldn't do that */
DPRINT1("SMSS: SmpParseCommandLine( %wZ ) failed - Status == %lx\n",
CommandLine, Status);
return Status;
}
/* Check if autochk is requested */
if (Flags & SMP_AUTOCHK_FLAG)
{
/* Run it */
Status = SmpInvokeAutoChk(&FileName, &Directory, &Arguments, Flags);
}
else if (Flags & SMP_SUBSYSTEM_FLAG)
{
Status = SmpLoadSubSystem(&FileName,
&Directory,
CommandLine,
MuSessionId,
ProcessId,
Flags);
}
else if (Flags & SMP_INVALID_PATH)
{
/* An invalid image was specified, fail */
DPRINT1("SMSS: Image file (%wZ) not found\n", &FileName);
Status = STATUS_OBJECT_NAME_NOT_FOUND;
}
else
{
/* An actual image name was present -- execute it */
Status = SmpExecuteImage(&FileName,
&Directory,
CommandLine,
MuSessionId,
Flags,
NULL);
}
/* Free all the token parameters */
if (FileName.Buffer) RtlFreeHeap(RtlGetProcessHeap(), 0, FileName.Buffer);
if (Directory.Buffer) RtlFreeHeap(RtlGetProcessHeap(), 0, Directory.Buffer);
if (Arguments.Buffer) RtlFreeHeap(RtlGetProcessHeap(), 0, Arguments.Buffer);
/* Return to the caller */
if (!NT_SUCCESS(Status))
{
DPRINT1("SMSS: Command '%wZ' failed - Status == %x\n",
CommandLine, Status);
}
return Status;
}
NTSTATUS
NTAPI
SmpExecuteInitialCommand(IN ULONG MuSessionId,
IN PUNICODE_STRING InitialCommand,
IN HANDLE InitialCommandProcess,
OUT PHANDLE ReturnPid)
{
NTSTATUS Status;
RTL_USER_PROCESS_INFORMATION ProcessInfo;
UNICODE_STRING Arguments, ImageFileDirectory, ImageFileName;
ULONG Flags = 0;
/* Check if we haven't yet connected to ourselves */
if (!SmApiPort)
{
/* Connect to ourselves, as a client */
Status = SmConnectToSm(NULL, NULL, 0, &SmApiPort);
if (!NT_SUCCESS(Status))
{
DPRINT1("SMSS: Unable to connect to SM - Status == %lx\n", Status);
return Status;
}
}
/* Parse the initial command line */
Status = SmpParseCommandLine(InitialCommand,
&Flags,
&ImageFileName,
&ImageFileDirectory,
&Arguments);
if (Flags & SMP_INVALID_PATH)
{
/* Fail if it doesn't exist */
DPRINT1("SMSS: Initial command image (%wZ) not found\n", &ImageFileName);
if (ImageFileName.Buffer) RtlFreeHeap(RtlGetProcessHeap(), 0, ImageFileName.Buffer);
return STATUS_OBJECT_NAME_NOT_FOUND;
}
/* And fail if any other reason is also true */
if (!NT_SUCCESS(Status))
{
DPRINT1("SMSS: SmpParseCommandLine( %wZ ) failed - Status == %lx\n",
InitialCommand, Status);
return Status;
}
/* Execute the initial command -- but defer its full execution */
Status = SmpExecuteImage(&ImageFileName,
&ImageFileDirectory,
InitialCommand,
MuSessionId,
SMP_DEFERRED_FLAG,
&ProcessInfo);
/* Free any buffers we had lying around */
if (ImageFileName.Buffer)
{
RtlFreeHeap(RtlGetProcessHeap(), 0, ImageFileName.Buffer);
}
if (ImageFileDirectory.Buffer)
{
RtlFreeHeap(RtlGetProcessHeap(), 0, ImageFileDirectory.Buffer);
}
if (Arguments.Buffer) RtlFreeHeap(RtlGetProcessHeap(), 0, Arguments.Buffer);
/* Bail out if we couldn't execute the initial command */
if (!NT_SUCCESS(Status)) return Status;
/* Now duplicate the handle to this process */
Status = NtDuplicateObject(NtCurrentProcess(),
ProcessInfo.ProcessHandle,
NtCurrentProcess(),
InitialCommandProcess,
PROCESS_ALL_ACCESS,
0,
0);
if (!NT_SUCCESS(Status))
{
/* Kill it utterly if duplication failed */
DPRINT1("SMSS: DupObject Failed. Status == %lx\n", Status);
NtTerminateProcess(ProcessInfo.ProcessHandle, Status);
NtResumeThread(ProcessInfo.ThreadHandle, NULL);
NtClose(ProcessInfo.ThreadHandle);
NtClose(ProcessInfo.ProcessHandle);
return Status;
}
/* Return PID to the caller, and set this as the initial command PID */
if (ReturnPid) *ReturnPid = ProcessInfo.ClientId.UniqueProcess;
if (!MuSessionId) SmpInitialCommandProcessId = ProcessInfo.ClientId.UniqueProcess;
/* Now call our server execution function to wrap up its initialization */
Status = SmExecPgm(SmApiPort, &ProcessInfo, FALSE);
if (!NT_SUCCESS(Status)) DPRINT1("SMSS: SmExecPgm Failed. Status == %lx\n", Status);
return Status;
}
NTSTATUS
NTAPI
SmpTerminate(IN PULONG_PTR Parameters,
IN ULONG ParameterMask,
IN ULONG ParameterCount)
{
NTSTATUS Status;
BOOLEAN Old;
ULONG Response;
/* Give the shutdown privilege to the thread */
if (RtlAdjustPrivilege(SE_SHUTDOWN_PRIVILEGE, TRUE, TRUE, &Old) ==
STATUS_NO_TOKEN)
{
/* Thread doesn't have a token, give it to the entire process */
RtlAdjustPrivilege(SE_SHUTDOWN_PRIVILEGE, TRUE, FALSE, &Old);
}
/* Take down the process/machine with a hard error */
Status = NtRaiseHardError(STATUS_SYSTEM_PROCESS_TERMINATED,
ParameterCount,
ParameterMask,
Parameters,
OptionShutdownSystem,
&Response);
/* Terminate the process if the hard error didn't already */
return NtTerminateProcess(NtCurrentProcess(), Status);
}
LONG
SmpUnhandledExceptionFilter(IN PEXCEPTION_POINTERS ExceptionInfo)
{
ULONG_PTR Parameters[4];
UNICODE_STRING DestinationString;
/* Print and breakpoint into the debugger */
DbgPrint("SMSS: Unhandled exception - Status == %x IP == %p\n",
ExceptionInfo->ExceptionRecord->ExceptionCode,
ExceptionInfo->ExceptionRecord->ExceptionAddress);
DbgPrint(" Memory Address: %x Read/Write: %x\n",
ExceptionInfo->ExceptionRecord->ExceptionInformation[0],
ExceptionInfo->ExceptionRecord->ExceptionInformation[1]);
DbgBreakPoint();
/* Build the hard error and terminate */
RtlInitUnicodeString(&DestinationString, L"Unhandled Exception in Session Manager");
Parameters[0] = (ULONG_PTR)&DestinationString;
Parameters[1] = ExceptionInfo->ExceptionRecord->ExceptionCode;
Parameters[2] = (ULONG_PTR)ExceptionInfo->ExceptionRecord->ExceptionAddress;
Parameters[3] = (ULONG_PTR)ExceptionInfo->ContextRecord;
SmpTerminate(Parameters, 1, RTL_NUMBER_OF(Parameters));
/* We should never get here */
ASSERT(FALSE);
return EXCEPTION_EXECUTE_HANDLER;
}
NTSTATUS
__cdecl
_main(IN INT argc,
IN PCHAR argv[],
IN PCHAR envp[],
IN ULONG DebugFlag)
{
NTSTATUS Status;
KPRIORITY SetBasePriority;
ULONG_PTR Parameters[4];
HANDLE Handles[2];
PVOID State;
ULONG Flags;
PROCESS_BASIC_INFORMATION ProcessInfo;
UNICODE_STRING DbgString, InitialCommand;
/* Make us critical */
RtlSetProcessIsCritical(TRUE, NULL, FALSE);
RtlSetThreadIsCritical(TRUE, NULL, FALSE);
/* Raise our priority */
SetBasePriority = 11;
Status = NtSetInformationProcess(NtCurrentProcess(),
ProcessBasePriority,
(PVOID)&SetBasePriority,
sizeof(SetBasePriority));
ASSERT(NT_SUCCESS(Status));
/* Save the debug flag if it was passed */
if (DebugFlag) SmpDebug = DebugFlag != 0;
/* Build the hard error parameters */
Parameters[0] = (ULONG_PTR)&DbgString;
Parameters[1] = Parameters[2] = Parameters[3] = 0;
/* Enter SEH so we can terminate correctly if anything goes wrong */
_SEH2_TRY
{
/* Initialize SMSS */
Status = SmpInit(&InitialCommand, Handles);
if (!NT_SUCCESS(Status))
{
DPRINT1("SMSS: SmpInit return failure - Status == %x\n", Status);
RtlInitUnicodeString(&DbgString, L"Session Manager Initialization");
Parameters[1] = Status;
_SEH2_LEAVE;
}
/* Get the global flags */
Status = NtQuerySystemInformation(SystemFlagsInformation,
&Flags,
sizeof(Flags),
NULL);
ASSERT(NT_SUCCESS(Status));
/* Before executing the initial command check if the debug flag is on */
if (Flags & (FLG_DEBUG_INITIAL_COMMAND | FLG_DEBUG_INITIAL_COMMAND_EX))
{
/* SMSS should launch ntsd with a few parameters at this point */
DPRINT1("Global Flags Set to SMSS Debugging: Not yet supported\n");
}
/* Execute the initial command (Winlogon.exe) */
Status = SmpExecuteInitialCommand(0, &InitialCommand, &Handles[1], NULL);
if (!NT_SUCCESS(Status))
{
/* Fail and raise a hard error */
DPRINT1("SMSS: Execute Initial Command failed\n");
RtlInitUnicodeString(&DbgString,
L"Session Manager ExecuteInitialCommand");
Parameters[1] = Status;
_SEH2_LEAVE;
}
/* Check if we're already attached to a session */
Status = SmpAcquirePrivilege(SE_LOAD_DRIVER_PRIVILEGE, &State);
if (AttachedSessionId != -1)
{
/* Detach from it, we should be in no session right now */
Status = NtSetSystemInformation(SystemSessionDetach,
&AttachedSessionId,
sizeof(AttachedSessionId));
ASSERT(NT_SUCCESS(Status));
AttachedSessionId = -1;
}
SmpReleasePrivilege(State);
/* Wait on either CSRSS or Winlogon to die */
Status = NtWaitForMultipleObjects(RTL_NUMBER_OF(Handles),
Handles,
WaitAny,
FALSE,
NULL);
if (Status == STATUS_WAIT_0)
{
/* CSRSS is dead, get exit code and prepare for the hard error */
RtlInitUnicodeString(&DbgString, L"Windows SubSystem");
Status = NtQueryInformationProcess(Handles[0],
ProcessBasicInformation,
&ProcessInfo,
sizeof(ProcessInfo),
NULL);
DPRINT1("SMSS: Windows subsystem terminated when it wasn't supposed to.\n");
}
else
{
/* The initial command is dead or we have another failure */
RtlInitUnicodeString(&DbgString, L"Windows Logon Process");
if (Status == STATUS_WAIT_1)
{
/* Winlogon.exe got terminated, get its exit code */
Status = NtQueryInformationProcess(Handles[1],
ProcessBasicInformation,
&ProcessInfo,
sizeof(ProcessInfo),
NULL);
}
else
{
/* Something else satisfied our wait, so set the wait status */
ProcessInfo.ExitStatus = Status;
Status = STATUS_SUCCESS;
}
DPRINT1("SMSS: Initial command '%wZ' terminated when it wasn't supposed to.\n",
&InitialCommand);
}
/* Check if NtQueryInformationProcess was successful */
if (NT_SUCCESS(Status))
{
/* Then we must have a valid exit status in the structure, use it */
Parameters[1] = ProcessInfo.ExitStatus;
}
else
{
/* We really don't know what happened, so set a generic error */
Parameters[1] = STATUS_UNSUCCESSFUL;
}
}
_SEH2_EXCEPT(SmpUnhandledExceptionFilter(_SEH2_GetExceptionInformation()))
{
/* The filter should never return here */
ASSERT(FALSE);
}
_SEH2_END;
/* Something in the init loop failed, terminate SMSS */
return SmpTerminate(Parameters, 1, RTL_NUMBER_OF(Parameters));
}
/* EOF */
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