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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim:expandtab:autoindent:tabstop=4:shiftwidth=4:filetype=c:cindent:textwidth=0:
*
* Copyright (C) 2005 Dell Inc.
* by Michael Brown <Michael_E_Brown@dell.com>
* Licensed under the Open Software License version 2.1
*
* Alternatively, you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published
* by the Free Software Foundation; either version 2 of the License,
* or (at your option) any later version.
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*/
#define LIBSMBIOS_SOURCE
#include "MemoryImpl.h"
#include "miniddk.h"
// include this last
#include "smbios/message.h"
using namespace std;
namespace memory
{
MemoryFactoryImpl::MemoryFactoryImpl()
{
setParameter("memFile", "\\Device\\PhysicalMemory");
}
// Non Member Functions
NtOpenSectionPtr NtOpenSection = NULL;
NtClosePtr NtClose = NULL;
NtMapViewOfSectionPtr NtMapViewOfSection = NULL;
NtUnmapViewOfSectionPtr NtUnmapViewOfSection = NULL;
RtlInitUnicodeStringPtr RtlInitUnicodeString = NULL;
ZwSystemDebugControlPtr ZwSystemDebugControl = NULL;
EnumSystemFirmwareTablesPtr EnumSystemFirmwareTables = NULL;
GetSystemFirmwareTablePtr GetSystemFirmwareTable = NULL;
u8 * CBlockBuffer = NULL;
u8 * EBlockBuffer = NULL;
int reopenHint = 1;
int LoadNtdllFuncs(void)
{
HMODULE hNtdll;
HMODULE hKerneldll;
hNtdll = GetModuleHandle(L"ntdll.dll");
hKerneldll = GetModuleHandle( L"kernel32.dll" );
if (!(hNtdll && hKerneldll))
return FALSE;
// should be available across all systems no matter our priv level
NtOpenSection = (NtOpenSectionPtr) GetProcAddress(hNtdll, "NtOpenSection");
NtClose = (NtClosePtr) GetProcAddress(hNtdll, "NtClose");
NtMapViewOfSection = (NtMapViewOfSectionPtr) GetProcAddress(hNtdll, "NtMapViewOfSection");
NtUnmapViewOfSection = (NtUnmapViewOfSectionPtr) GetProcAddress(hNtdll, "NtUnmapViewOfSection");
RtlInitUnicodeString = (RtlInitUnicodeStringPtr) GetProcAddress(hNtdll, "RtlInitUnicodeString");
ZwSystemDebugControl = (ZwSystemDebugControlPtr) GetProcAddress(hNtdll, "ZwSystemDebugControl");
// Donot return false since these APIs are only available on W2K3 SP1 and higher.
// returning FALSE will break libsmbios on W2K and W2K3( no SP )
EnumSystemFirmwareTables = (EnumSystemFirmwareTablesPtr) GetProcAddress(hKerneldll, "EnumSystemFirmwareTables");
GetSystemFirmwareTable = (GetSystemFirmwareTablePtr) GetProcAddress(hKerneldll, "GetSystemFirmwareTable");
return TRUE;
}
// MEB: fatal issue
// MEB: pass in filename. use getParameterString("memfile") as the
// parameter. makes it possible to unit test against file.
HANDLE OpenMemAccess(void)
{
UNICODE_STRING usDevmem;
OBJECT_ATTRIBUTES oaAttrs;
NTSTATUS status;
HANDLE hPhysMem = NULL;
RtlInitUnicodeString(&usDevmem, L"\\device\\physicalmemory");
InitializeObjectAttributes(&oaAttrs, &usDevmem, OBJ_CASE_INSENSITIVE, NULL, NULL);
status = NtOpenSection(&hPhysMem, SECTION_MAP_READ, &oaAttrs);
if (!NT_SUCCESS(status))
{
hPhysMem = NULL;
}
return hPhysMem;
}
int CloseMemAccess(HANDLE hPhysMem)
{
NTSTATUS status;
status = NtClose(hPhysMem);
if (!NT_SUCCESS(status))
{
return FALSE;
}
return TRUE;
}
int MapMem(HANDLE hPhysMem, PVOID pBaseAddr, PDWORD pPhysAddr, PDWORD pSize)
{
NTSTATUS status;
PHYSICAL_ADDRESS paAddr;
* (DWORD *) pBaseAddr = (DWORD) NULL;
paAddr.HighPart = 0;
paAddr.LowPart = *pPhysAddr;
status = NtMapViewOfSection(hPhysMem, NtCurrentProcess(), (PVOID *) pBaseAddr, 0L,
*pSize, &paAddr, pSize, ViewShare, 0, PAGE_READONLY);
if (!NT_SUCCESS(status))
{
hPhysMem = NULL;
return FALSE;
}
*pPhysAddr = paAddr.LowPart;
return TRUE;
}
int UnMapMem(PVOID pBaseAddr)
{
NTSTATUS status;
status = NtUnmapViewOfSection(NtCurrentProcess(), pBaseAddr);
if (!NT_SUCCESS(status))
{
return FALSE;
}
return TRUE;
}
static BOOL setPrivilege(LPCTSTR privilegeName, BOOL enable)
{
HANDLE hToken;
HANDLE hCurrentProcess;
DWORD err;
TOKEN_PRIVILEGES tkprivs;
// Get a token for this process.
hCurrentProcess = GetCurrentProcess();
if(OpenProcessToken(GetCurrentProcess(), TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY, &hToken))
{
// Get the LUID for the security privilege.
LookupPrivilegeValue(NULL, privilegeName, &tkprivs.Privileges[0].Luid);
tkprivs.PrivilegeCount = 1; // one privilege to set
tkprivs.Privileges[0].Attributes = enable ? SE_PRIVILEGE_ENABLED : 0;
// Get the security privilege for this process.
AdjustTokenPrivileges(hToken, FALSE, &tkprivs, 0, (PTOKEN_PRIVILEGES)NULL, NULL);
}
// get the error returned by AdjustTokenPrivileges() or OpenProcessToken()
err = GetLastError();
return err == ERROR_SUCCESS;
}
void readPhysicalMemoryMap( HANDLE hPhysMem, u8 *buffer, u64 offset, unsigned int length)
{
unsigned int totalBytes = 0;
unsigned int originalSize = length;
unsigned int pageSize = length;
if(!hPhysMem)
{
throw AccessErrorImpl( _("Handle to physical memory was not set or could not be opened.") );
}
if(0 == buffer)
{
throw AccessErrorImpl( _("Error accessing buffer.") );
}
while(totalBytes != originalSize )
{
DWORD BaseAddr;
DWORD PhysAddr = static_cast<DWORD>(offset);
// OK, first get the page that has the requested offset. This
// function will round-down physaddr to the nearest page boundary,
// and the pageSize will change to the size of the page
if (!MapMem(hPhysMem, (PVOID) &BaseAddr, &PhysAddr, reinterpret_cast<PDWORD>(&pageSize)))
{
throw AccessErrorImpl( _("Error mapping physical memory.") );
}
//Find the index into the page based on requested offset
unsigned int index = static_cast<DWORD>(offset) - PhysAddr;
// Only continue to copy if the index is within the pageSize and
// we still need bytes
while( index < pageSize && totalBytes != originalSize)
{
u64 tmp = BaseAddr + index; // extra tmp to satisfy vc++ /w4
buffer[totalBytes] = *reinterpret_cast<u8 *>(tmp);
index++;
totalBytes++;
}
u64 tmp = BaseAddr; // extra tmp to satisfy vc++ /w4
if (!UnMapMem(reinterpret_cast<PVOID>(tmp)))
{
throw AccessErrorImpl( _("Error unmapping physical memory."));
}
// If the inner while loop exited due to the end of the page, we
// need to update the offset and the remaining size and map
// another page
offset = PhysAddr + index;
pageSize = originalSize-totalBytes;
}
}
void readPhysicalMemoryDebugSysctl( u8 *buffer, u64 offset, unsigned int length)
{
MEM_STRUCT mem;
NTSTATUS status;
ULONG bytesReturned;
memset(&mem, 0, sizeof(mem));
mem.Addr = (DWORD)offset;
mem.pBuf = buffer;
mem.NumBytes = (DWORD)length;
status = ZwSystemDebugControl(DebugSysReadPhysicalMemory,
&mem,
sizeof(mem),
0,
0,
&bytesReturned);
if (! NT_SUCCESS(status) )
{
throw AccessErrorImpl( _("Could not use Debug Sysctl to read physical memory."));
}
}
// breaks for requests that span boundaries
// breaks for requests of mem at offset > 1M
void enumSystemFirmwareTables( u8 *buffer, u64 offset, unsigned int length)
{
// The following code is added for faster access. Otherewise, it takes libsmbios
// approx 3-5minutes to get Service tag etc.
if( offset >= 0xC0000 && offset < 0xDFFFF && CBlockBuffer != NULL )
{
memset( buffer, 0, length );
memcpy( buffer, &CBlockBuffer[(DWORD)offset - 0xC0000], length );
return;
}
// The following code is added for faster access. Otherewise, it takes libsmbios
// approx 3-5minutes to get Service tag etc.
if( offset >= 0xE0000 && offset < 0xFFFFF && EBlockBuffer != NULL ) // optimization
{
memset( buffer, 0, length );
memcpy( buffer, &EBlockBuffer[(DWORD)offset - 0xE0000], length );
return;
}
DWORD iSignature = 0x46000000 | 0x00490000 | 0x00005200 | 0x0000004D ; //FIRM
// pass NULL to EnumSystemFirmwareTables. This will return the size needed.
unsigned int iBufferSizeNeeded = EnumSystemFirmwareTables( iSignature, NULL, 0 );
if( iBufferSizeNeeded > 0 )
{
DWORD * FirmwareTableEnumBuffer = new DWORD[iBufferSizeNeeded];
ULONG i=0;
for( i = 0; i < iBufferSizeNeeded; i++ ) // zero out the buffer. Otherwise, the function sometimes fails.
{
FirmwareTableEnumBuffer[i] = 0;
}
EnumSystemFirmwareTables( iSignature, FirmwareTableEnumBuffer, iBufferSizeNeeded );
DWORD FirmwareTableNameToUse = 0;
for( i = 0; i < iBufferSizeNeeded; i++ )
{
if( FirmwareTableEnumBuffer[i] > 0 && FirmwareTableEnumBuffer[i] <= offset && offset <= FirmwareTableEnumBuffer[i] + 128 * 1024 )
{
FirmwareTableNameToUse = FirmwareTableEnumBuffer[i];
}
}
delete [] FirmwareTableEnumBuffer;
if( FirmwareTableNameToUse == 0 )
{
throw AccessErrorImpl( _("Could not locate a table which can be used.") );
}
iBufferSizeNeeded = GetSystemFirmwareTable( iSignature, FirmwareTableNameToUse, NULL, 0 );
if( iBufferSizeNeeded > 0 )
{
u8 * MemoryAtRequestedOffSet = NULL;
MemoryAtRequestedOffSet = new u8[iBufferSizeNeeded];
if( MemoryAtRequestedOffSet != NULL )
{
memset( MemoryAtRequestedOffSet, 0, iBufferSizeNeeded );
memset( buffer, 0, length );
GetSystemFirmwareTable( iSignature, FirmwareTableNameToUse, MemoryAtRequestedOffSet, iBufferSizeNeeded );
memcpy( buffer, &MemoryAtRequestedOffSet[(DWORD)offset - FirmwareTableNameToUse], length );
if( FirmwareTableNameToUse == 0xC0000 )
{
CBlockBuffer = MemoryAtRequestedOffSet; // save for later use
}
else
if( FirmwareTableNameToUse == 0xE0000 )
{
EBlockBuffer = MemoryAtRequestedOffSet; // save for later use
}
else
{
delete MemoryAtRequestedOffSet;
}
}
else
{
throw AccessErrorImpl( _("Failed to allocate memory for Firmware table.") );
}
}
else
{
throw AccessErrorImpl( _("GetSystemFirmwareTable returned 0 for table length.") );
}
}
else
{
throw AccessErrorImpl( _("EnumSystemFirmwareTables returned 0 for table size.") );
}
}
MemoryOsSpecific::MemoryOsSpecific( const string )
: IMemory()
{
HANDLE hPhysMem = NULL;
if (!LoadNtdllFuncs())
{
//printf("Could not find functions in dll!\n");
//TODO change exception
throw AccessErrorImpl( _("Could not load ntdll functions!") );
}
// DEBUG privs necessary to call systemdebugcontrol
// set here to avoid big delays in mem read loops
setPrivilege(SE_DEBUG_NAME, 1);
hPhysMem = OpenMemAccess();
osData = static_cast<HANDLE *>(hPhysMem);
}
MemoryOsSpecific::~MemoryOsSpecific()
{
HANDLE hPhysMem = static_cast<HANDLE>(osData);
// NEVER THROW FROM DESTRUCTOR!
if(hPhysMem)
{
CloseMemAccess(hPhysMem); // if this fails, something bad happened,
} // but there isn't anything we can do about it.
delete CBlockBuffer; // safe to delete NULL
CBlockBuffer = NULL;
delete EBlockBuffer; // safe to delete NULL
EBlockBuffer = NULL;
}
void MemoryOsSpecific::fillBuffer( u8 *buffer, u64 offset, unsigned int length) const
{
if( EnumSystemFirmwareTables && GetSystemFirmwareTable )
{
// Use the newer W2K3 SP1 APIs if they are available.
// If we first call readPhysicalMemoryMap and readPhysicalMemoryDebugSysctl
// and then call enumSystemFirmwareTables, the new GetSystemFirmwareTable API
// of W2K3 SP1 returns invalid data.
enumSystemFirmwareTables( buffer, offset, length );
}
else
{
HANDLE hPhysMem = static_cast<HANDLE>(osData);
if(hPhysMem)
{
readPhysicalMemoryMap( hPhysMem, buffer, offset, length );
}
else
{
readPhysicalMemoryDebugSysctl( buffer, offset, length );
}
}
}
u8 MemoryOsSpecific::getByte( u64 offset ) const
{
u8 value = 0;
fillBuffer(&value, offset, 1);
return value;
}
void MemoryOsSpecific::putByte( u64 , u8 ) const
{
throw smbios::NotImplementedImpl( _("writing to physical memory is not implemented on Windows yet.") );
}
// yes, I know these do absolutely nothing right now.
int MemoryOsSpecific::incReopenHint()
{
return ++reopenHint;
}
int MemoryOsSpecific::decReopenHint()
{
return --reopenHint;
}
}
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