说,如果我在过程中调用GetProcessHeaps
以获取其使用的堆列表。有一个堆HANDLE
,我该如何确定是否使用HEAP_NO_SERIALIZE
标志创建了这样的堆?
虽然不是确定的答案,但您可以调用HeapQueryInformation(HeapCompatibilityInformation)
,如果它返回2,则它是序列化的,因为MSDN对HAEAP_NO_SERIALIZE表示了这一点:
无法为使用此选项创建的堆启用低碎片堆(LFH(
我不知道是否有无证件的API来获取标志,但是出于调试目的,您可以直接访问内部堆结构:
void DumpHeapType_Win8_x86(HANDLE hHeap)
{
typedef struct {
UINT32 Unknown1[2];
UINT32 Sig;
UINT32 Unknown2[1];
void*Unknown3[2]; //LIST_ENTRY?
void*Unknown4[1+1+1+1+2];
UINT32 Unknown5[1+1+1+1];
UINT32 Flags;
} HEAP_HDR;
typedef struct {
UINT32 Unknown1[2];
UINT32 Sig;
UINT32 Unknown2[1];
void*Unknown3[2]; //LIST_ENTRY?
HEAP_HDR*pHdr;
} HEAP_THING;
HEAP_THING *pThing = (HEAP_THING*) hHeap;
if (hHeap && pThing->Sig == 0xffeeffee)
{
HEAP_HDR *pHdr = (HEAP_HDR*) pThing->pHdr;
if (pHdr->Sig == 0xffeeffee)
{
printf("Flags=%#x Serialized=%dn", pHdr->Flags, !(pHdr->Flags & HEAP_NO_SERIALIZE));
}
}
}
void playwithheaps()
{
HANDLE hHeap;
DumpHeapType_Win8_x86(hHeap = GetProcessHeap());
DumpHeapType_Win8_x86(hHeap = HeapCreate(0, 0, 0)); if (hHeap) HeapDestroy(hHeap);
DumpHeapType_Win8_x86(hHeap = HeapCreate(HEAP_NO_SERIALIZE, 0, 0)); if (hHeap) HeapDestroy(hHeap);
DumpHeapType_Win8_x86(hHeap = HeapCreate(HEAP_NO_SERIALIZE|HEAP_GENERATE_EXCEPTIONS, 0, 0)); if (hHeap) HeapDestroy(hHeap);
}
在我的Windows 8机器上,这给了我以下输出:
Flags=0x2 Serialized=1
Flags=0x1002 Serialized=1
Flags=0x1003 Serialized=0
Flags=0x1007 Serialized=0
但是堆结构布局在其他版本上可能有所不同,因此您只需要仔细测试...