进程peb结构、获得peb的方法

PEB ：进程环境块
TEB.ProcessEnvironmentBlock成员就是PEB的结构体地址
TEB结构体位于FS段选择符所指的段内存的起始地址处，
且ProcessEnvironmentBlock成员位于距TEB结构体Offset 30的位置
即有两种方法获得PEB的地址



peb的结构申明：

typedef struct _UNICODE_STR
{
USHORT Length;
USHORT MaximumLength;
PWSTR pBuffer;
} UNICODE_STR, *PUNICODE_STR;

typedef struct _LDR_DATA_TABLE_ENTRY
{
//LIST_ENTRY InLoadOrderLinks;
LIST_ENTRY InMemoryOrderModuleList;
LIST_ENTRY InInitializationOrderModuleList;
PVOID DllBase;
PVOID EntryPoint;
ULONG SizeOfImage;
UNICODE_STR FullDllName;
UNICODE_STR BaseDllName;
ULONG Flags;
SHORT LoadCount;
SHORT TlsIndex;
LIST_ENTRY HashTableEntry;
ULONG TimeDateStamp;
} LDR_DATA_TABLE_ENTRY, *PLDR_DATA_TABLE_ENTRY;

typedef struct _PEB_LDR_DATA //, 7 elements, 0x28 bytes
{
DWORD dwLength;
DWORD dwInitialized;
LPVOID lpSsHandle;
LIST_ENTRY InLoadOrderModuleList;
LIST_ENTRY InMemoryOrderModuleList;
LIST_ENTRY InInitializationOrderModuleList;
LPVOID lpEntryInProgress;
} PEB_LDR_DATA, *PPEB_LDR_DATA;

typedef struct _PEB_FREE_BLOCK // 2 elements, 0x8 bytes
{
struct _PEB_FREE_BLOCK * pNext;
DWORD dwSize;
} PEB_FREE_BLOCK, *PPEB_FREE_BLOCK;

typedef struct __PEB // 65 elements, 0x210 bytes
{
BYTE bInheritedAddressSpace;
BYTE bReadImageFileExecOptions;
BYTE bBeingDebugged;
BYTE bSpareBool;
LPVOID lpMutant;
LPVOID lpImageBaseAddress;
PPEB_LDR_DATA pLdr;
LPVOID lpProcessParameters;
LPVOID lpSubSystemData;
LPVOID lpProcessHeap;
PRTL_CRITICAL_SECTION pFastPebLock;
LPVOID lpFastPebLockRoutine;
LPVOID lpFastPebUnlockRoutine;
DWORD dwEnvironmentUpdateCount;
LPVOID lpKernelCallbackTable;
DWORD dwSystemReserved;
DWORD dwAtlThunkSListPtr32;
PPEB_FREE_BLOCK pFreeList;
DWORD dwTlsExpansionCounter;
LPVOID lpTlsBitmap;
DWORD dwTlsBitmapBits[2];
LPVOID lpReadOnlySharedMemoryBase;
LPVOID lpReadOnlySharedMemoryHeap;
LPVOID lpReadOnlyStaticServerData;
LPVOID lpAnsiCodePageData;
LPVOID lpOemCodePageData;
LPVOID lpUnicodeCaseTableData;
DWORD dwNumberOfProcessors;
DWORD dwNtGlobalFlag;
LARGE_INTEGER liCriticalSectionTimeout;
DWORD dwHeapSegmentReserve;
DWORD dwHeapSegmentCommit;
DWORD dwHeapDeCommitTotalFreeThreshold;
DWORD dwHeapDeCommitFreeBlockThreshold;
DWORD dwNumberOfHeaps;
DWORD dwMaximumNumberOfHeaps;
LPVOID lpProcessHeaps;
LPVOID lpGdiSharedHandleTable;
LPVOID lpProcessStarterHelper;
DWORD dwGdiDCAttributeList;
LPVOID lpLoaderLock;
DWORD dwOSMajorVersion;
DWORD dwOSMinorVersion;
WORD wOSBuildNumber;
WORD wOSCSDVersion;
DWORD dwOSPlatformId;
DWORD dwImageSubsystem;
DWORD dwImageSubsystemMajorVersion;
DWORD dwImageSubsystemMinorVersion;
DWORD dwImageProcessAffinityMask;
DWORD dwGdiHandleBuffer[34];
LPVOID lpPostProcessInitRoutine;
LPVOID lpTlsExpansionBitmap;
DWORD dwTlsExpansionBitmapBits[32];
DWORD dwSessionId;
ULARGE_INTEGER liAppCompatFlags;
ULARGE_INTEGER liAppCompatFlagsUser;
LPVOID lppShimData;
LPVOID lpAppCompatInfo;
UNICODE_STR usCSDVersion;
LPVOID lpActivationContextData;
LPVOID lpProcessAssemblyStorageMap;
LPVOID lpSystemDefaultActivationContextData;
LPVOID lpSystemAssemblyStorageMap;
DWORD dwMinimumStackCommit;
} _PEB, *_PPEB;

获得PEB：

#include "Test.h"
#include <winioctl.h>

int main()
{
_PPEB PebBaseAddress = (_PPEB)__readfsdword(0x30);   //FS[0x60]  即x86进程PEB
int a = GetLastError();

printf_s("PebBaseAddress:0x%x\r\n", PebBaseAddress);

PPEB_LDR_DATA pPebLdr = PebBaseAddress->pLdr;
PLDR_DATA_TABLE_ENTRY pLdrDataHeader = (PLDR_DATA_TABLE_ENTRY)pPebLdr->InMemoryOrderModuleList.Flink;
PLDR_DATA_TABLE_ENTRY pLdrDataTail = (PLDR_DATA_TABLE_ENTRY)pPebLdr->InMemoryOrderModuleList.Flink;
printf_s("加载的模块：\r\n");
do
{
WCHAR* DllName = pLdrDataHeader->BaseDllName.pBuffer;
//USHORT usCounter = pLdrDataHeader->BaseDllName.Length;
pLdrDataHeader = (PLDR_DATA_TABLE_ENTRY)pLdrDataHeader->InMemoryOrderModuleList.Flink;
printf_s("%S\r\n", DllName);

}
while (pLdrDataHeader != pLdrDataTail);
return 0;
}