[jgardou] 50085: [VGA_NEW] - avoid buffer overrun, CID 11049 Brought to light by vicmarcal
21 Dec
2010
21 Dec
'10
9:55 p.m.
Author: jgardou
Date: Tue Dec 21 21:55:29 2010
New Revision: 50085
URL: http://svn.reactos.org/svn/reactos?rev=50085&view=rev
Log:
[VGA_NEW]
- avoid buffer overrun, CID 11049
Brought to light by vicmarcal
Modified:
trunk/reactos/drivers/video/miniport/vga_new/vbe.c
trunk/reactos/drivers/video/miniport/vga_new/vbe.h
trunk/reactos/drivers/video/miniport/vga_new/vbemodes.c
trunk/reactos/drivers/video/miniport/vga_new/vga.h
Modified: trunk/reactos/drivers/video/miniport/vga_new/vbe.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/video/miniport/vga…
==============================================================================
--- trunk/reactos/drivers/video/miniport/vga_new/vbe.c [iso-8859-1] (original)
+++ trunk/reactos/drivers/video/miniport/vga_new/vbe.c [iso-8859-1] Tue Dec 21 21:55:29
2010
@@ -42,7 +42,7 @@
{
ULONG i;
CHAR Version[21];
-
+
/* If the broken VESA bios found, turn VESA off */
VideoPortDebugPrint(0, "Vendor: %s Product: %s Revision: %s (%lx)\n",
Vendor, Product, Revision, OemRevision);
for (i = 0; i < (sizeof(BrokenVesaBiosList) / sizeof(PCHAR)); i++)
@@ -52,7 +52,7 @@
/* For Brookdale-G (Intel), special hack used */
g_bIntelBrookdaleBIOS = !strncmp(Product, IntelBrookdale, sizeof(IntelBrookdale));
-
+
/* For NVIDIA make sure */
if (!(strncmp(Vendor, Nv11Vendor, sizeof(Nv11Vendor))) &&
!(strncmp(Product, Nv11Board, sizeof(Nv11Board))) &&
@@ -64,10 +64,10 @@
0xC000,
345,
Version,
- sizeof(Version))) return FALSE;
+ sizeof(Version))) return FALSE;
if (!strncmp(Version, "Version 3.11.01.24N16", sizeof(Version))) return
FALSE;
}
-
+
/* VESA ok */
//VideoPortDebugPrint(0, "Vesa ok\n");
return TRUE;
@@ -85,13 +85,13 @@
CHAR ProductName[80];
CHAR VendorName[80];
VP_STATUS Status;
-
+
/* Set default */
VesaBiosOk = FALSE;
Context = VgaExtension->Int10Interface.Context;
-
+
/* Check magic and version */
- if (strncmp(VbeInfo->Info.Signature, "VESA", 4)) return VesaBiosOk;
+ if (VbeInfo->Info.Signature == VESA_MAGIC) return VesaBiosOk;
if (VbeInfo->Info.Version < 0x102) return VesaBiosOk;
/* Read strings */
@@ -125,13 +125,13 @@
ProductName[sizeof(OemString) - 1] = ANSI_NULL;
ProductRevision[sizeof(OemString) - 1] = ANSI_NULL;
OemString[sizeof(OemString) - 1] = ANSI_NULL;
-
+
/* Check for known bad BIOS */
VesaBiosOk = IsVesaBiosOk(&VgaExtension->Int10Interface,
VbeInfo->Info.OemSoftwareRevision,
VendorName,
ProductName,
- ProductRevision);
+ ProductRevision);
VgaExtension->VesaBiosOk = VesaBiosOk;
return VesaBiosOk;
}
@@ -151,7 +151,7 @@
USHORT i;
Entries = ClutBuffer->NumEntries;
-
+
/* Allocate INT10 context/buffer */
VesaClut = VideoPortAllocatePool(VgaExtension, 1, sizeof(ULONG) * Entries,
0x20616756u);
if (!VesaClut) return ERROR_INVALID_PARAMETER;
@@ -178,7 +178,7 @@
Entries * sizeof(ULONG));
if (Status != NO_ERROR) return ERROR_INVALID_PARAMETER;
- /* Write new palette */
+ /* Write new palette */
BiosArguments.Ebx = 0;
BiosArguments.Ecx = Entries;
BiosArguments.Edx = ClutBuffer->FirstEntry;
Modified: trunk/reactos/drivers/video/miniport/vga_new/vbe.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/video/miniport/vga…
==============================================================================
--- trunk/reactos/drivers/video/miniport/vga_new/vbe.h [iso-8859-1] (original)
+++ trunk/reactos/drivers/video/miniport/vga_new/vbe.h [iso-8859-1] Tue Dec 21 21:55:29
2010
@@ -94,7 +94,7 @@
typedef struct _VBE_CONTROLLER_INFO
{
- CHAR Signature[4];
+ ULONG Signature;
USHORT Version;
ULONG OemStringPtr;
LONG Capabilities;
@@ -214,4 +214,7 @@
extern BOOLEAN g_bIntelBrookdaleBIOS;
+/* VBE2 magic number */
+#define VBE2_MAGIC ('V' + ('B' << 8) + ('E' << 16) +
('2' << 24))
+
/* EOF */
Modified: trunk/reactos/drivers/video/miniport/vga_new/vbemodes.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/video/miniport/vga…
==============================================================================
--- trunk/reactos/drivers/video/miniport/vga_new/vbemodes.c [iso-8859-1] (original)
+++ trunk/reactos/drivers/video/miniport/vga_new/vbemodes.c [iso-8859-1] Tue Dec 21
21:55:29 2010
@@ -26,7 +26,7 @@
RaiseToPower2(IN USHORT Value)
{
ULONG SquaredResult = Value;
- if ((Value - 1) & Value) for (SquaredResult = 1; (SquaredResult < Value)
&& (SquaredResult); SquaredResult *= 2);
+ if ((Value - 1) & Value) for (SquaredResult = 1; (SquaredResult < Value)
&& (SquaredResult); SquaredResult *= 2);
return SquaredResult;
}
@@ -34,7 +34,7 @@
NTAPI
VbeGetVideoMemoryBaseAddress(IN PHW_DEVICE_EXTENSION VgaExtension,
IN PVIDEOMODE VgaMode)
-{
+{
ULONG Length = 4 * 1024;
USHORT TrampolineMemorySegment, TrampolineMemoryOffset;
PVOID Context;
@@ -46,7 +46,7 @@
/* Need linear and INT10 interface */
if (!(VgaMode->fbType & VIDEO_MODE_BANKED)) return 0;
if (VgaExtension->Int10Interface.Size) return 0;
-
+
/* Allocate scratch area and context */
VbeModeInfo = VideoPortAllocatePool(VgaExtension, 1, sizeof(VBE_MODE_INFO), '
agV');
if (!VbeModeInfo) return 0;
@@ -71,7 +71,7 @@
VbeModeInfo,
sizeof(VBE_MODE_INFO));
if (Status != NO_ERROR) return 0;
-
+
/* Return phys address and cleanup */
BaseAddress = VbeModeInfo->PhysBasePtr;
VgaExtension->Int10Interface.Int10FreeBuffer(Context,
@@ -91,8 +91,8 @@
VIDEO_X86_BIOS_ARGUMENTS BiosArguments;
ULONG ModeIndex;
ULONG BaseAddress;
-
- VideoPortZeroMemory(&BiosArguments, sizeof(BiosArguments));
+
+ VideoPortZeroMemory(&BiosArguments, sizeof(BiosArguments));
ModeIndex = VgaMode->Mode;
BiosArguments.Eax = ModeIndex & 0x0000FFFF;
BiosArguments.Ebx = ModeIndex >> 16;
@@ -100,12 +100,12 @@
Status = VideoPortInt10(VgaDeviceExtension, &BiosArguments);
if (Status != NO_ERROR) return Status;
- /* Check for VESA mode */
+ /* Check for VESA mode */
if (ModeIndex >> 16)
{
/* Mode set fail */
if (BiosArguments.Eax != VBE_SUCCESS) return ERROR_INVALID_PARAMETER;
-
+
/* Check current mode is desired mode */
BiosArguments.Eax = VBE_GET_CURRENT_VBE_MODE;
Status = VideoPortInt10(VgaDeviceExtension, &BiosArguments);
@@ -132,7 +132,7 @@
}
}
}
-
+
/* Get VRAM address to update changes */
BaseAddress = VbeGetVideoMemoryBaseAddress(VgaDeviceExtension, VgaMode);
if ((BaseAddress) && (VgaMode->PhysBase != BaseAddress))
@@ -140,8 +140,8 @@
*PhysPtrChange = TRUE;
VgaMode->PhysBase = BaseAddress;
}
-
- return NO_ERROR;
+
+ return NO_ERROR;
}
VOID
@@ -179,7 +179,7 @@
VgaExtension->Int10Interface.Version = 0;
return;
}
-
+
/* Query INT10 interface */
VgaExtension->Int10Interface.Version = VIDEO_PORT_INT10_INTERFACE_VERSION_1;
VgaExtension->Int10Interface.Size = sizeof(VIDEO_PORT_INT10_INTERFACE);
@@ -190,12 +190,12 @@
VgaExtension->Int10Interface.Size = 0;
VgaExtension->Int10Interface.Version = 0;
}
-
+
/* Add ref */
//VideoPortDebugPrint(0, "have int10 iface\n");
VgaExtension->Int10Interface.InterfaceReference(VgaExtension->Int10Interface.Context);
Context = VgaExtension->Int10Interface.Context;
-
+
/* Allocate scratch area and context */
Status = VgaExtension->Int10Interface.Int10AllocateBuffer(Context,
&TrampolineMemorySegment,
@@ -209,7 +209,7 @@
/* Init VBE data and write to card buffer */
//VideoPortDebugPrint(0, "have int10 data\n");
VbeInfo->ModeArray[128] = 0xFFFF;
- strcpy(VbeInfo->Info.Signature, "VBE2");
+ VbeInfo->Info.Signature = VBE2_MAGIC;
Status = VgaExtension->Int10Interface.Int10WriteMemory(Context,
TrampolineMemorySegment,
TrampolineMemoryOffset,
@@ -237,7 +237,7 @@
VbeVersion = VbeInfo->Info.Version;
VideoPortDebugPrint(0, "vbe version %lx memory %lx\n", VbeVersion,
TotalMemory);
if (!ValidateVbeInfo(VgaExtension, VbeInfo)) return;
-
+
/* Read modes */
//VideoPortDebugPrint(0, "read modes from %p\n",
VbeInfo->Info.VideoModePtr);
Status = VgaExtension->Int10Interface.Int10ReadMemory(Context,
@@ -259,11 +259,11 @@
ModeResult = *++ThisMode;
NewModes++;
}
-
+
/* Remove the built-in mode if not supported by card and check max modes */
if (!FourBppModeFound) --NumVideoModes;
if ((NewModes >= 128) && (NumVideoModes > 8)) goto Cleanup;
-
+
/* Switch to new SVGA mode list, copy VGA modes */
VgaModeList = VideoPortAllocatePool(VgaExtension, 1, (NewModes + NumVideoModes) *
sizeof(VIDEOMODE), ' agV');
if (!VgaModeList) goto Cleanup;
@@ -275,7 +275,7 @@
VideoPortDebugPrint(0, "Intel Brookdale-G Video BIOS Not Support!\n");
while (TRUE);
}
-
+
/* Scan SVGA modes */
// VideoPortDebugPrint(0, "Static modes: %d\n", NumVideoModes);
VgaMode = &VgaModeList[NumVideoModes];
@@ -328,7 +328,7 @@
if (VbeModeInfo->ModeAttributes & VBE_MODEATTR_COLOR)
VgaMode->fbType |= VIDEO_MODE_COLOR;
if (VbeModeInfo->ModeAttributes & VBE_MODEATTR_GRAPHICS)
VgaMode->fbType |= VIDEO_MODE_GRAPHICS;
if (VbeModeInfo->ModeAttributes & VBE_MODEATTR_NON_VGA)
VgaMode->NonVgaMode = TRUE;
-
+
/* If no char data, say 80x25 */
VgaMode->col = VbeModeInfo->XCharSize ? VbeModeInfo->XResolution /
VbeModeInfo->XCharSize : 80;
VgaMode->row = VbeModeInfo->YCharSize ? VbeModeInfo->YResolution /
VbeModeInfo->YCharSize : 25;
@@ -338,8 +338,8 @@
VgaMode->bitsPerPlane = VbeModeInfo->BitsPerPixel /
VbeModeInfo->NumberOfPlanes;
if ((VgaMode->bitsPerPlane == 16) &&
(VbeModeInfo->GreenMaskSize == 5)) VgaMode->bitsPerPlane = 15;
//VideoPortDebugPrint(0, "BPP: %d\n", VgaMode->BitsPerPlane);
-
- /* Do linear or banked frame buffers */
+
+ /* Do linear or banked frame buffers */
VgaMode->FrameBufferBase = 0;
if (!LinearAddressing)
{
@@ -347,7 +347,7 @@
ScreenStride = RaiseToPower2(VbeModeInfo->BytesPerScanLine);
VgaMode->wbytes = ScreenStride;
//VideoPortDebugPrint(0, "ScanLines: %lx Stride: %lx\n",
VbeModeInfo->BytesPerScanLine, VgaMode->Stride);
-
+
/* Size of frame buffer is Height X ScanLine, align to bank/page size */
ScreenSize = VgaMode->hres * ScreenStride;
//VideoPortDebugPrint(0, "Size: %lx\n", ScreenSize);
@@ -355,7 +355,7 @@
//VideoPortDebugPrint(0, "Size: %lx\n", ScreenSize);
if (Size > TotalMemory) Size = (Size + ((4 * 1024) - 1)) & ((4 *
1024) - 1);
//VideoPortDebugPrint(0, "Size: %lx\n", ScreenSize);
-
+
/* Banked VGA at 0xA0000 (64K) */
//VideoPortDebugPrint(0, "Final size: %lx\n", Size);
VgaMode->fbType |= VIDEO_MODE_BANKED;
@@ -374,7 +374,7 @@
if (!ScreenStride) ScreenStride = VbeModeInfo->BytesPerScanLine;
VgaMode->wbytes = ScreenStride;
//VideoPortDebugPrint(0, "ScanLines: %lx Stride: %lx\n",
VbeModeInfo->BytesPerScanLine, VgaMode->Stride);
-
+
/* Size of frame buffer is Height X ScanLine, align to page size */
ScreenSize = VgaMode->hres * LOWORD(VgaMode->wbytes);
//VideoPortDebugPrint(0, "Size: %lx\n", ScreenSize);
@@ -382,7 +382,7 @@
//VideoPortDebugPrint(0, "Size: %lx\n", ScreenSize);
if (Size > TotalMemory) Size = (Size + ((4 * 1024) - 1)) & ((4 *
1024) - 1);
//VideoPortDebugPrint(0, "Size: %lx\n", ScreenSize);
-
+
/* Linear VGA must read settings from VBE */
VgaMode->fbType |= VIDEO_MODE_LINEAR;
VgaMode->sbytes = Size;
@@ -391,14 +391,14 @@
VgaMode->NoBankSwitch = FALSE;
VgaMode->PhysBase = VbeModeInfo->PhysBasePtr;
VgaMode->LogicalWidth = VgaMode->hres;
-
+
/* Make VBE_SET_VBE_MODE command use Linear Framebuffer Select */
VgaMode->Mode |= (VBE_MODE_LINEAR_FRAMEBUFFER << 16);
}
-
+
/* Override bank switch if not support by card */
if (VbeModeInfo->ModeAttributes & VBE_MODEATTR_NO_BANK_SWITCH)
VgaMode->NoBankSwitch = TRUE;
-
+
/* Next */
if (ScreenSize <= TotalMemory)
{
Modified: trunk/reactos/drivers/video/miniport/vga_new/vga.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/video/miniport/vga…
==============================================================================
--- trunk/reactos/drivers/video/miniport/vga_new/vga.h [iso-8859-1] (original)
+++ trunk/reactos/drivers/video/miniport/vga_new/vga.h [iso-8859-1] Tue Dec 21 21:55:29
2010
@@ -266,7 +266,7 @@
// eVb: 3.3 [VBE]
PUSHORT CmdStream; // pointer to array of register-setting commands to
// set up mode
-// eVb: 3.4 [VBE] - Add fields to track linear addresses/sizes and flags
+// eVb: 3.4 [VBE] - Add fields to track linear addresses/sizes and flags
ULONG PhysBase;
ULONG FrameBufferBase;
ULONG FrameBufferSize;
@@ -407,7 +407,7 @@
UCHAR CursorEnable; // whether cursor is enabled or not
UCHAR CursorTopScanLine; // Cursor Start register setting (top scan)
UCHAR CursorBottomScanLine; // Cursor End register setting (bottom scan)
-// eVb: 3.5 [VBE] - Add fields for VBE support and XP+ INT10 interface
+// eVb: 3.5 [VBE] - Add fields for VBE support and XP+ INT10 interface
VIDEO_PORT_INT10_INTERFACE Int10Interface;
BOOLEAN VesaBiosOk;
// eVb: 3.5 [END]
@@ -438,9 +438,12 @@
extern VIDEOMODE ModesVGA[];
extern PVIDEOMODE VgaModeList;
-// eVb: 3.5 [VGA] - Add ATI/Mach64 Access Range
+// eVb: 3.5 [VGA] - Add ATI/Mach64 Access Range
#define NUM_VGA_ACCESS_RANGES 5
// eVb: 3.5 [END]
extern VIDEO_ACCESS_RANGE VgaAccessRange[];
+/* VESA Bios Magic number */
+#define VESA_MAGIC ('V' + ('E' << 8) + ('S' << 16) +
('A' << 24))
+
#include "vbe.h"
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