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[];
    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[];
    LPVOID lpPostProcessInitRoutine;
    LPVOID lpTlsExpansionBitmap;
    DWORD dwTlsExpansionBitmapBits[];
    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 ;
}