[aandrejevic] 67603: [NTVDM] DosTerminateProcess shouldn't blindly attempt to restore the old state, (for example if the process was started manually by a debugger).
8 May
2015
8 May
'15
11:26 p.m.
Author: aandrejevic
Date: Fri May 8 23:26:15 2015
New Revision: 67603
URL: http://svn.reactos.org/svn/reactos?rev=67603&view=rev
Log:
[NTVDM]
DosTerminateProcess shouldn't blindly attempt to restore the old state,
(for example if the process was started manually by a debugger).
Modified:
trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c
trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.h
trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/process.c
trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/process.h
Modified: trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/dos/…
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c [iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.c [iso-8859-1] Fri May 8
23:26:15 2015
@@ -1342,7 +1342,6 @@
BYTE OrgAL = getAL();
LPSTR ProgramName = SEG_OFF_TO_PTR(getDS(), getDX());
PDOS_EXEC_PARAM_BLOCK ParamBlock = SEG_OFF_TO_PTR(getES(), getBX());
- DWORD ReturnAddress = MAKELONG(Stack[STACK_IP], Stack[STACK_CS]);
WORD ErrorCode;
if (OrgAL <= DOS_LOAD_OVERLAY)
@@ -1353,9 +1352,7 @@
if (LoadType == DOS_LOAD_AND_EXECUTE)
{
/* Create a new process */
- ErrorCode = DosCreateProcess(ProgramName,
- ParamBlock,
- ReturnAddress);
+ ErrorCode = DosCreateProcess(ProgramName, ParamBlock);
}
else
#endif
@@ -1365,8 +1362,7 @@
ProgramName,
ParamBlock,
NULL,
- NULL,
- ReturnAddress);
+ NULL);
}
}
else if (OrgAL == 0x05)
@@ -2003,7 +1999,7 @@
#endif
/* Initialize the callback context */
- InitializeContext(&DosContext, 0x0070, 0x0000);
+ InitializeContext(&DosContext, DOS_CODE_SEGMENT, 0x0000);
/* Register the DOS 32-bit Interrupts */
RegisterDosInt32(0x20, DosInt20h );
Modified: trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/dos/…
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.h [iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/dos.h [iso-8859-1] Fri May 8
23:26:15 2015
@@ -30,6 +30,7 @@
#define USER_MEMORY_SIZE (0x9FFE - FIRST_MCB_SEGMENT)
#define SYSTEM_PSP 0x08
#define SYSTEM_ENV_BLOCK 0x800
+#define DOS_CODE_SEGMENT 0x70
#define DOS_DATA_SEGMENT 0xA0
#define MASTER_SFT_OFFSET 0x100
Modified: trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/process.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/dos/…
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/process.c [iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/process.c [iso-8859-1] Fri May 8
23:26:15 2015
@@ -54,6 +54,7 @@
/* Allocate stack space for the registers */
StackPointer -= sizeof(DOS_REGISTER_STATE);
State = SEG_OFF_TO_PTR(getSS(), StackPointer);
+ setSP(StackPointer);
/* Save */
State->EAX = getEAX();
@@ -74,12 +75,10 @@
static inline VOID DosRestoreState(VOID)
{
PDOS_REGISTER_STATE State;
- WORD StackPointer = getSP();
-
- /* SS:SP points to the stack on the last entry to INT 21h */
- StackPointer -= (STACK_FLAGS + 1) * 2; /* Interrupt parameters */
- StackPointer -= sizeof(DOS_REGISTER_STATE); /* Pushed state structure */
- State = SEG_OFF_TO_PTR(getSS(), StackPointer);
+
+ /* Pop the state structure from the stack */
+ State = SEG_OFF_TO_PTR(getSS(), getSP());
+ setSP(getSP() + sizeof(DOS_REGISTER_STATE));
/* Restore */
setEAX(State->EAX);
@@ -244,8 +243,7 @@
IN LPCSTR ExecutablePath,
IN PDOS_EXEC_PARAM_BLOCK Parameters,
IN LPCSTR CommandLine OPTIONAL,
- IN LPCSTR Environment OPTIONAL,
- IN DWORD ReturnAddress OPTIONAL)
+ IN LPCSTR Environment OPTIONAL)
{
DWORD Result = ERROR_SUCCESS;
HANDLE FileHandle = INVALID_HANDLE_VALUE, FileMapping = NULL;
@@ -264,8 +262,7 @@
DPRINT1("DosLoadExecutable(%d, %s, 0x%08X, 0x%08X)\n",
LoadType,
ExecutablePath,
- Parameters,
- ReturnAddress);
+ Parameters);
/* Try to get the full path to the executable */
if (GetFullPathNameA(ExecutablePath, sizeof(FullPath), FullPath, NULL))
@@ -454,8 +451,8 @@
DosChangeMemoryOwner(Segment, Segment);
DosChangeMemoryOwner(EnvBlock, Segment);
- /* Set INT 22h to the return address */
- ((PULONG)BaseAddress)[0x22] = ReturnAddress;
+ /* Set INT 22h to the current CS:IP */
+ ((PULONG)BaseAddress)[0x22] = MAKELONG(getIP(), getCS());
/* Create the PSP */
DosCreatePsp(Segment, (WORD)TotalSize);
@@ -497,7 +494,14 @@
if (LoadType == DOS_LOAD_AND_EXECUTE)
{
/* Save the program state */
- if (CurrentPsp != SYSTEM_PSP) DosSaveState();
+ if (CurrentPsp != SYSTEM_PSP)
+ {
+ /* Push the task state */
+ DosSaveState();
+
+ /* Update the last stack in the PSP */
+ SEGMENT_TO_PSP(CurrentPsp)->LastStack = MAKELONG(getSP(), getSS());
+ }
/* Set the initial segment registers */
setDS(Segment);
@@ -546,8 +550,8 @@
DosChangeMemoryOwner(Segment, Segment);
DosChangeMemoryOwner(EnvBlock, Segment);
- /* Set INT 22h to the return address */
- ((PULONG)BaseAddress)[0x22] = ReturnAddress;
+ /* Set INT 22h to the current CS:IP */
+ ((PULONG)BaseAddress)[0x22] = MAKELONG(getIP(), getCS());
/* Create the PSP */
DosCreatePsp(Segment, MaxAllocSize);
@@ -570,6 +574,16 @@
if (LoadType == DOS_LOAD_AND_EXECUTE)
{
+ /* Save the program state */
+ if (CurrentPsp != SYSTEM_PSP)
+ {
+ /* Push the task state */
+ DosSaveState();
+
+ /* Update the last stack in the PSP */
+ SEGMENT_TO_PSP(CurrentPsp)->LastStack = MAKELONG(getSP(), getSS());
+ }
+
/* Set the initial segment registers */
setDS(Segment);
setES(Segment);
@@ -621,7 +635,6 @@
IN LPCSTR Environment OPTIONAL)
{
DWORD Result;
- LPDWORD IntVecTable = (LPDWORD)((ULONG_PTR)BaseAddress);
SIZE_T CmdLen = strlen(CommandLine);
DPRINT1("Starting '%s' ('%.*s')...\n",
@@ -636,8 +649,7 @@
ExecutablePath,
NULL,
CommandLine,
- Environment,
- IntVecTable[0x20]);
+ Environment);
if (Result != ERROR_SUCCESS) goto Quit;
@@ -665,8 +677,7 @@
#ifndef STANDALONE
WORD DosCreateProcess(LPCSTR ProgramName,
- PDOS_EXEC_PARAM_BLOCK Parameters,
- DWORD ReturnAddress)
+ PDOS_EXEC_PARAM_BLOCK Parameters)
{
DWORD Result;
DWORD BinaryType;
@@ -784,8 +795,7 @@
AppName,
Parameters,
CmdLine,
- Env,
- ReturnAddress);
+ Env);
if (Result == ERROR_SUCCESS)
{
/* Increment the re-entry count */
@@ -924,8 +934,14 @@
setSS(HIWORD(SEGMENT_TO_PSP(CurrentPsp)->LastStack));
setSP(LOWORD(SEGMENT_TO_PSP(CurrentPsp)->LastStack));
- /* Restore the program state */
- DosRestoreState();
+ DPRINT1("Terminate returning to %08X\n", PspBlock->TerminateAddress);
+
+ /* Are we returning to DOS code? */
+ if (HIWORD(PspBlock->TerminateAddress) == DOS_CODE_SEGMENT)
+ {
+ /* Pop the task state */
+ DosRestoreState();
+ }
/* Return control to the parent process */
CpuExecute(HIWORD(PspBlock->TerminateAddress),
Modified: trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/process.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/subsystems/mvdm/ntvdm/dos/…
==============================================================================
--- trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/process.h [iso-8859-1] (original)
+++ trunk/reactos/subsystems/mvdm/ntvdm/dos/dos32krnl/process.h [iso-8859-1] Fri May 8
23:26:15 2015
@@ -97,8 +97,7 @@
IN LPCSTR ExecutablePath,
IN PDOS_EXEC_PARAM_BLOCK Parameters,
IN LPCSTR CommandLine OPTIONAL,
- IN LPCSTR Environment OPTIONAL,
- IN DWORD ReturnAddress OPTIONAL
+ IN LPCSTR Environment OPTIONAL
);
DWORD DosStartProcess(
@@ -110,8 +109,7 @@
WORD DosCreateProcess
(
LPCSTR ProgramName,
- PDOS_EXEC_PARAM_BLOCK Parameters,
- DWORD ReturnAddress
+ PDOS_EXEC_PARAM_BLOCK Parameters
);
VOID DosTerminateProcess(WORD Psp, BYTE ReturnCode, WORD KeepResident);
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aandrejevic＠svn.reactos.org