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[NTVDM]

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Make the emulator callbacks non-static.
In BiosPrintCallback, use EmulatorWriteMemory instead of VgaWriteMemory, because
VgaWriteMemory does not do any input validation.
Improve EmulatorWriteMemory input validation and bound checking.


svn path=/branches/ntvdm/; revision=60903
This commit is contained in:
Aleksandar Andrejevic 2013-11-09 17:16:04 +00:00
parent 53d6212640
commit f4f6809d67
3 changed files with 65 additions and 13 deletions
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5
subsystems/ntvdm/bios.c
View file

@ -760,7 +760,8 @@ VOID BiosPrintCharacter(CHAR Character, BYTE Attribute, BYTE Page)
/* Default character */
/* Write the character */
VgaWriteMemory(TO_LINEAR(TEXT_VIDEO_SEG,
EmulatorWriteMemory(&EmulatorContext,
TO_LINEAR(TEXT_VIDEO_SEG,
Page * Bda->VideoPageSize
+ (Row * Bda->ScreenColumns + Column) * sizeof(WORD)),
(LPVOID)&CharData,
@ -789,6 +790,8 @@ VOID BiosPrintCharacter(CHAR Character, BYTE Attribute, BYTE Page)
Rectangle,
Page,
DEFAULT_ATTRIBUTE);
Row--;
}
/* Set the cursor position */

20
subsystems/ntvdm/emulator.c
View file

@ -29,7 +29,7 @@ static BOOLEAN A20Line = FALSE;
/* PRIVATE FUNCTIONS **********************************************************/
static VOID WINAPI EmulatorReadMemory(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
VOID WINAPI EmulatorReadMemory(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
{
UNREFERENCED_PARAMETER(State);
@ -47,14 +47,16 @@ static VOID WINAPI EmulatorReadMemory(PFAST486_STATE State, ULONG Address, PVOID
&& (Address < VgaGetVideoLimitAddress()))
{
DWORD VgaAddress = max(Address, VgaGetVideoBaseAddress());
DWORD ActualSize = min(Address + Size - 1, VgaGetVideoLimitAddress())
- VgaAddress + 1;
LPBYTE VgaBuffer = (LPBYTE)((ULONG_PTR)Buffer + VgaAddress - Address);
/* Read from the VGA memory */
VgaReadMemory(VgaAddress, VgaBuffer, Size);
VgaReadMemory(VgaAddress, VgaBuffer, ActualSize);
}
}
static VOID WINAPI EmulatorWriteMemory(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
VOID WINAPI EmulatorWriteMemory(PFAST486_STATE State, ULONG Address, PVOID Buffer, ULONG Size)
{
UNREFERENCED_PARAMETER(State);
@ -75,14 +77,16 @@ static VOID WINAPI EmulatorWriteMemory(PFAST486_STATE State, ULONG Address, PVOI
&& (Address < VgaGetVideoLimitAddress()))
{
DWORD VgaAddress = max(Address, VgaGetVideoBaseAddress());
DWORD ActualSize = min(Address + Size - 1, VgaGetVideoLimitAddress())
- VgaAddress + 1;
LPBYTE VgaBuffer = (LPBYTE)((ULONG_PTR)Buffer + VgaAddress - Address);
/* Write to the VGA memory */
VgaWriteMemory(VgaAddress, VgaBuffer, Size);
VgaWriteMemory(VgaAddress, VgaBuffer, ActualSize);
}
}
static VOID WINAPI EmulatorReadIo(PFAST486_STATE State, ULONG Port, PVOID Buffer, ULONG DataCount, UCHAR DataSize)
VOID WINAPI EmulatorReadIo(PFAST486_STATE State, ULONG Port, PVOID Buffer, ULONG DataCount, UCHAR DataSize)
{
INT i, j;
LPBYTE Address = (LPBYTE)Buffer;
@ -169,7 +173,7 @@ static VOID WINAPI EmulatorReadIo(PFAST486_STATE State, ULONG Port, PVOID Buffer
}
}
static VOID WINAPI EmulatorWriteIo(PFAST486_STATE State, ULONG Port, PVOID Buffer, ULONG DataCount, UCHAR DataSize)
VOID WINAPI EmulatorWriteIo(PFAST486_STATE State, ULONG Port, PVOID Buffer, ULONG DataCount, UCHAR DataSize)
{
INT i, j;
LPBYTE Address = (LPBYTE)Buffer;
@ -268,7 +272,7 @@ static VOID WINAPI EmulatorWriteIo(PFAST486_STATE State, ULONG Port, PVOID Buffe
}
}
static VOID WINAPI EmulatorBiosOperation(PFAST486_STATE State, UCHAR BopCode)
VOID WINAPI EmulatorBiosOperation(PFAST486_STATE State, UCHAR BopCode)
{
WORD StackSegment, StackPointer;
LPWORD Stack;
@ -286,7 +290,7 @@ static VOID WINAPI EmulatorBiosOperation(PFAST486_STATE State, UCHAR BopCode)
DPRINT1("Invalid BOP code %u\n", BopCode);
}
static UCHAR WINAPI EmulatorIntAcknowledge(PFAST486_STATE State)
UCHAR WINAPI EmulatorIntAcknowledge(PFAST486_STATE State)
{
UNREFERENCED_PARAMETER(State);

45
subsystems/ntvdm/emulator.h
View file

@ -86,6 +86,51 @@ extern FAST486_STATE EmulatorContext;
/* FUNCTIONS ******************************************************************/
VOID WINAPI EmulatorReadMemory
(
PFAST486_STATE State,
ULONG Address,
PVOID Buffer,
ULONG Size
);
VOID WINAPI EmulatorWriteMemory
(
PFAST486_STATE State,
ULONG Address,
PVOID Buffer,
ULONG Size
);
VOID WINAPI EmulatorReadIo
(
PFAST486_STATE State,
ULONG Port,
PVOID Buffer,
ULONG DataCount,
UCHAR DataSize
);
VOID WINAPI EmulatorWriteIo
(
PFAST486_STATE State,
ULONG Port,
PVOID Buffer,
ULONG DataCount,
UCHAR DataSize
);
VOID WINAPI EmulatorBiosOperation
(
PFAST486_STATE State,
UCHAR BopCode
);
UCHAR WINAPI EmulatorIntAcknowledge
(
PFAST486_STATE State
);
BOOLEAN EmulatorInitialize(VOID);
VOID EmulatorSetStack(WORD Segment, DWORD Offset);
VOID EmulatorExecute(WORD Segment, WORD Offset);