mirror of
https://github.com/reactos/reactos.git
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418 lines
9.5 KiB
C
418 lines
9.5 KiB
C
/* $Id: spawn.c,v 1.3 2002/03/10 17:09:46 hyperion Exp $
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*/
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/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS POSIX+ Subsystem
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* FILE: subsys/psx/lib/psxdll/misc/spawn.c
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* PURPOSE: Create the first POSIX+ process
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* PROGRAMMER: KJK::Hyperion <noog@libero.it>
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* UPDATE HISTORY:
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* 25/02/2002: Created
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*/
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/*
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* NOTE by KJK::Hyperion:
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* The __PdxSpawnPosixProcess() call solves the chicken-egg dilemma of
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* creating the first POSIX+ process in a group without the ability to
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* fork+exec (for example from inside a Win32 process). Processes created by
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* __PdxSpawnPosixProcess() will *not* inherit anything from the parent, not
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* even handles: all creation parameters have to be specified explicitely
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*/
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#include <ddk/ntddk.h>
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#include <ntdll/base.h>
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#include <napi/i386/segment.h>
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#include <ntdll/rtl.h>
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#include <ntdll/ldr.h>
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#include <stddef.h>
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#include <string.h>
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#include <inttypes.h>
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#include <pthread.h>
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#include <psx/debug.h>
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#include <psx/pdata.h>
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#include <psx/stdlib.h>
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NTSTATUS STDCALL __PdxSpawnPosixProcess
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(
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OUT PHANDLE ProcessHandle,
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OUT PHANDLE ThreadHandle,
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IN POBJECT_ATTRIBUTES FileObjectAttributes,
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IN POBJECT_ATTRIBUTES ProcessObjectAttributes,
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IN HANDLE InheritFromProcessHandle,
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IN __PPDX_PDATA ProcessData
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)
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{
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__PPDX_SERIALIZED_PDATA pspdProcessData;
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IO_STATUS_BLOCK isbStatus;
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PROCESS_BASIC_INFORMATION pbiProcessInfo;
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ANSI_STRING strStartEntry;
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PVOID pStartAddress;
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INITIAL_TEB itInitialTeb;
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CONTEXT ctxThreadContext;
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CLIENT_ID ciClientId;
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NTSTATUS nErrCode;
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HANDLE hExeFile;
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HANDLE hExeImage;
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HANDLE hProcess;
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HANDLE hThread;
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PVOID pDestBuffer;
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ULONG nDestBufferSize;
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ULONG nCurFilDesOffset;
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int i;
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/* STEP 1: map executable image in memory */
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/* 1.1: open the file for execution */
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nErrCode = NtOpenFile
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(
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&hExeFile,
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SYNCHRONIZE | FILE_EXECUTE,
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FileObjectAttributes,
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&isbStatus,
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FILE_SHARE_READ | FILE_SHARE_DELETE,
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FILE_SYNCHRONOUS_IO_NONALERT | FILE_NON_DIRECTORY_FILE
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);
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/* failure */
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if(!NT_SUCCESS(nErrCode))
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{
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ERR("NtOpenFile() failed with status 0x%08X\n", nErrCode);
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return (nErrCode);
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}
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/* 1.2: create a memory section for the file */
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nErrCode = NtCreateSection
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(
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&hExeImage,
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SECTION_ALL_ACCESS,
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NULL,
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0,
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PAGE_EXECUTE,
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SEC_IMAGE,
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hExeFile
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);
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/* close file handle (not needed anymore) */
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NtClose(hExeFile);
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/* failure */
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if(!NT_SUCCESS(nErrCode))
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{
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ERR("NtCreateSection() failed with status 0x%08X\n", nErrCode);
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return (nErrCode);
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}
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/* STEP 2: create process */
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nErrCode = NtCreateProcess
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(
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&hProcess,
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PROCESS_ALL_ACCESS,
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ProcessObjectAttributes,
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InheritFromProcessHandle,
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FALSE,
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hExeImage,
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NULL,
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NULL
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);
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/* close image handle (not needed anymore) */
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NtClose(hExeImage);
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/* failure */
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if(!NT_SUCCESS(nErrCode))
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{
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ERR("NtCreateProcess() failed with status 0x%08X\n", nErrCode);
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return (nErrCode);
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}
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/* STEP 3: write process environment */
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/* 3.1: serialize the process data for transfer */
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/* FIXME: the serialized data can be allocated and written directly in the
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destination process */
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__PdxSerializeProcessData(ProcessData, &pspdProcessData);
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/* 3.1.1: adjust some fields */
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pspdProcessData->ProcessData.Spawned = TRUE;
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/* 3.2: allocate memory in the destination process */
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nDestBufferSize = pspdProcessData->AllocSize;
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nErrCode = NtAllocateVirtualMemory
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(
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hProcess,
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&pDestBuffer,
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0,
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&nDestBufferSize,
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MEM_COMMIT,
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PAGE_READWRITE
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);
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/* failure */
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if(!NT_SUCCESS(nErrCode))
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{
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ERR("NtAllocateVirtualMemory() failed with status 0x%08X\n", nErrCode);
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goto undoPData;
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}
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/* 3.3: get pointer to the PEB */
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nErrCode = NtQueryInformationProcess
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(
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hProcess,
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ProcessBasicInformation,
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&pbiProcessInfo,
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sizeof(pbiProcessInfo),
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NULL
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);
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/* failure */
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if(!NT_SUCCESS(nErrCode))
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{
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ERR("NtQueryInformationProcess() failed with status 0x%08X\n", nErrCode);
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goto undoPData;
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}
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/* 3.4: write pointer to process data in the SubSystemData field of the PEB */
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nErrCode = NtWriteVirtualMemory
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(
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hProcess,
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(PVOID)((ULONG)pbiProcessInfo.PebBaseAddress + offsetof(PEB, SubSystemData)),
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&pDestBuffer,
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sizeof(PVOID),
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NULL
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);
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/* failure */
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if(!NT_SUCCESS(nErrCode))
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{
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ERR("NtWriteVirtualMemory() failed with status 0x%08X\n", nErrCode);
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goto undoPData;
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}
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/* 3.5: write the process data */
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nErrCode = NtWriteVirtualMemory
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(
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hProcess,
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pDestBuffer,
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pspdProcessData,
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pspdProcessData->AllocSize,
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NULL
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);
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undoPData:
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/* deallocate the temporary data block in the current process */
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NtFreeVirtualMemory
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(
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NtCurrentProcess(),
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(PVOID *)&pspdProcessData,
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0,
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MEM_RELEASE
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);
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/* failure */
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if(!NT_SUCCESS(nErrCode))
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return (nErrCode);
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/* STEP 4: duplicate handles */
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/* 4.1: handles in the structure itself */
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/* 4.1.1: root directory */
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nErrCode = NtDuplicateObject
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(
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NtCurrentProcess(),
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ProcessData->RootHandle,
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hProcess,
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(PHANDLE)((ULONG)pDestBuffer + offsetof(__PDX_PDATA, RootHandle)),
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0,
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0,
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DUPLICATE_SAME_ACCESS | 4 /* | DUPLICATE_SAME_ATTRIBUTES */ /* FIXME */
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);
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/* failure */
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if(!NT_SUCCESS(nErrCode))
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{
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ERR("NtDuplicateObject() failed with status 0x%08X\n", nErrCode);
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goto failProcess;
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}
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/* 4.2: file descriptors table */
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for
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(
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/* pspdProcessData->ProcessData.FdTable.Descriptors contains the offset to
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the descriptors array inside pspdProcessData->Buffer[], that is to the
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first element of the array */
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i = 0,
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nCurFilDesOffset = (ULONG)pspdProcessData->ProcessData.FdTable.Descriptors;
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/* iterate through all allocated descriptors */
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i < ProcessData->FdTable.AllocatedDescriptors;
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/* at every step, go on to next input descriptor, and increase the offset to
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the next output descriptor */
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i ++, nCurFilDesOffset += sizeof(__fildes_t)
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)
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/* FIXME? check the table's bitmap instead? */
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if(ProcessData->FdTable.Descriptors[i].FileHandle != NULL)
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{
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/* duplicate the source handle, ProcessData->FdTable.Descriptors[i], from
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the current process into the process identified by hProcess, at an
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address calculated by adding to the serialized data block base address:
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- the offset to the current descriptor
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- the offset to the handle field of the descriptor */
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nErrCode = NtDuplicateObject
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(
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NtCurrentProcess(),
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ProcessData->FdTable.Descriptors[i].FileHandle,
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hProcess,
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(PHANDLE)(
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(ULONG)pDestBuffer + nCurFilDesOffset + offsetof(__fildes_t, FileHandle)
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),
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0,
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0,
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DUPLICATE_SAME_ACCESS | 4 /* | DUPLICATE_SAME_ATTRIBUTES */ /* FIXME */
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);
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/* failure */
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if(!NT_SUCCESS(nErrCode))
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{
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ERR("NtDuplicateObject() failed with status 0x%08X\n", nErrCode);
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goto failProcess;
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}
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}
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/* STEP 5: create first thread */
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/* 5.1: get thunk routine's address */
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RtlInitAnsiString(&strStartEntry, "LdrInitializeThunk");
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nErrCode = LdrGetProcedureAddress
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(
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(PVOID)NTDLL_BASE,
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&strStartEntry,
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0,
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&pStartAddress
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);
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/* failure */
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if(!NT_SUCCESS(nErrCode))
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{
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ERR("LdrGetProcedureAddress() failed with status 0x%08X\n", nErrCode);
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goto failProcess;
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}
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/* 5.2: set up the initial TEB */
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itInitialTeb.StackAllocate = NULL;
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/* FIXME: allow the caller to specify these values */
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itInitialTeb.StackReserve = 0x100000;
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itInitialTeb.StackCommit = itInitialTeb.StackReserve - PAGESIZE;
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/* guard page */
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itInitialTeb.StackCommit += PAGESIZE;
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/* 5.2.1: set up the stack */
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/* 5.2.1.1: reserve the stack */
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nErrCode = NtAllocateVirtualMemory
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(
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hProcess,
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&itInitialTeb.StackAllocate,
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0,
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&itInitialTeb.StackReserve,
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MEM_RESERVE,
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PAGE_READWRITE
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);
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/* failure */
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if(!NT_SUCCESS(nErrCode))
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{
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ERR("NtAllocateVirtualMemory() failed with status 0x%08X\n", nErrCode);
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goto failProcess;
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}
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itInitialTeb.StackBase =
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(PVOID)((ULONG)itInitialTeb.StackAllocate + itInitialTeb.StackReserve);
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itInitialTeb.StackLimit =
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(PVOID)((ULONG)itInitialTeb.StackBase - itInitialTeb.StackCommit);
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/* 5.2.1.2: commit the stack */
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nErrCode = NtAllocateVirtualMemory
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(
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hProcess,
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&itInitialTeb.StackLimit,
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0,
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&itInitialTeb.StackCommit,
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MEM_COMMIT,
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PAGE_READWRITE
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);
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/* failure */
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if(!NT_SUCCESS(nErrCode))
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{
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ERR("NtAllocateVirtualMemory() failed with status 0x%08X\n", nErrCode);
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goto failProcess;
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}
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/* 5.2.1.3: set up the guard page */
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nErrCode = NtProtectVirtualMemory
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(
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hProcess,
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itInitialTeb.StackLimit,
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PAGESIZE,
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PAGE_GUARD | PAGE_READWRITE,
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NULL
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);
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/* failure */
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if(!NT_SUCCESS(nErrCode))
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{
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ERR("NtProtectVirtualMemory() failed with status 0x%08X\n", nErrCode);
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goto failProcess;
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}
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/* 5.2.1.4: initialize the thread context */
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memset(&ctxThreadContext, 0, sizeof(ctxThreadContext));
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ctxThreadContext.Eip = (ULONG)pStartAddress;
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ctxThreadContext.SegGs = USER_DS;
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ctxThreadContext.SegFs = USER_DS;
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ctxThreadContext.SegEs = USER_DS;
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ctxThreadContext.SegDs = USER_DS;
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ctxThreadContext.SegCs = USER_CS;
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ctxThreadContext.SegSs = USER_DS;
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/* skip five doublewords (four - unknown - parameters for LdrInitializeThunk,
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and the return address) */
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ctxThreadContext.Esp = (ULONG)itInitialTeb.StackBase - 5 * 4;
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ctxThreadContext.EFlags = (1 << 1) + (1 << 9);
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/* 5.3: create the thread object */
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nErrCode = NtCreateThread
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(
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NULL,
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THREAD_ALL_ACCESS,
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NULL,
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hProcess,
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&ciClientId,
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&ctxThreadContext,
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&itInitialTeb,
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FALSE
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);
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/* failure */
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if(!NT_SUCCESS(nErrCode))
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{
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ERR("NtCreateThread() failed with status 0x%08X\n", nErrCode);
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goto failProcess;
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}
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/* success */
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return (STATUS_SUCCESS);
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/* failure */
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failProcess:
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NtTerminateProcess
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(
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hProcess,
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nErrCode
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);
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return (nErrCode);
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}
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/* EOF */
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