xp下用户程序空间分配（9）：还剩下什么？

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本文适用于
Xp sp3
vs2008


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在去除前面的部分后，看看内存里还剩下什么：

基址	分配基址	分配保护	大小	状态	保护	类型
00010000	00010000	00000004 PAGE_READWRITE	00002000	00001000 MEM_COMMIT	00000004 PAGE_READWRITE	00020000 MEM_PRIVATE
7ffdd000	7ffdd000	00000004 PAGE_READWRITE	00001000	00001000 MEM_COMMIT	00000004 PAGE_READWRITE	00020000 MEM_PRIVATE
7ffde000	7ffde000	00000004 PAGE_READWRITE	00001000	00001000 MEM_COMMIT	00000004 PAGE_READWRITE	00020000 MEM_PRIVATE
7ffdf000	7ffdf000	00000004 PAGE_READWRITE	00001000	00001000 MEM_COMMIT	00000004 PAGE_READWRITE	00020000 MEM_PRIVATE
7ffe0000	7ffe0000	00000002 PAGE_READONLY	00001000	00001000 MEM_COMMIT	00000002 PAGE_READONLY	00020000 MEM_PRIVATE

这些块都比较小，究竟是什么东西？

1.1 环境块

在毛德操的《windows内核情境分析》里提及一个叫环境块（好像是这个名字）的东西，且是在内存的最低的位置，咱看看它的内容：
0x00010000 3d 00 3a 00 3a 00 3d 00 3a 00 3a 00 5c 00 00 00 3d 00 45 00 =::=::/.=E
0x00010014 3a 00 3d 00 45 00 3a 00 5c 00 50 00 72 00 6f 00 67 00 72 00 :=E:/Progr
0x00010028 61 00 6d 00 20 00 46 00 69 00 6c 00 65 00 73 00 5c 00 4d 00 am Files/M
0x0001003C 69 00 63 00 72 00 6f 00 73 00 6f 00 66 00 74 00 20 00 56 00 icrosoft V
0x00010050 69 00 73 00 75 00 61 00 6c 00 20 00 53 00 74 00 75 00 64 00 isual Stud
0x00010064 69 00 6f 00 20 00 39 00 2e 00 30 00 5c 00 56 00 43 00 5c 00 io 9.0/VC/
0x00010078 76 00 63 00 70 00 61 00 63 00 6b 00 61 00 67 00 65 00 73 00 vcpackages
0x0001008C 00 00 3d 00 46 00 3a 00 3d 00 46 00 3a 00 5c 00 65 00 6d 00 .=F:=F:/em
0x000100A0 62 00 65 00 64 00 5c 00 65 00 74 00 6f 00 6f 00 6c 00 73 00 bed/etools
0x000100B4 00 00 41 00 4c 00 4c 00 55 00 53 00 45 00 52 00 53 00 50 00 .ALLUSERSP
0x000100C8 52 00 4f 00 46 00 49 00 4c 00 45 00 3d 00 45 00 3a 00 5c 00 ROFILE=E:/
0x000100DC 44 00 6f 00 63 00 75 00 6d 00 65 00 6e 00 74 00 73 00 20 00 Documents
0x000100F0 61 00 6e 00 64 00 20 00 53 00 65 00 74 00 74 00 69 00 6e 00 and Settin
0x00010104 67 00 73 00 5c 00 41 00 6c 00 6c 00 20 00 55 00 73 00 65 00 gs/All Use
0x00010118 72 00 73 00 00 00 41 00 50 00 50 00 44 00 41 00 54 00 41 00 rs.APPDATA
0x0001012C 3d 00 45 00 3a 00 5c 00 44 00 6f 00 63 00 75 00 6d 00 65 00 =E:/Docume
0x00010140 6e 00 74 00 73 00 20 00 61 00 6e 00 64 00 20 00 53 00 65 00 nts and Se
0x00010154 74 00 74 00 69 00 6e 00 67 00 73 00 5c 00 00 5f d1 53 05 80 ttings/开发者
0x00010168 5c 00 41 00 70 00 70 00 6c 00 69 00 63 00 61 00 74 00 69 00 /Applicati
0x0001017C 6f 00 6e 00 20 00 44 00 61 00 74 00 61 00 00 00 42 00 58 00 on Data.BX
0x00010190 53 00 48 00 41 00 52 00 45 00 3d 00 2e 00 00 00 43 00 44 00 SHARE=..CD
0x000101A4 53 00 52 00 4f 00 4f 00 54 00 3d 00 65 00 3a 00 5c 00 65 00 SROOT=e:/e
都是些unicode文本，把它的内容和系统环境变量进行比较，差别还是比较明显的，但是系统环境变量和用户环境变量在这块内存区里都可以找到相应的定义。尝试在用户环境变量里添加一个定义，再重新运行程序，果然在这块区域里找到了这个新的环境变量。

1.2 NT_TIB

每个线程都有一块地方记录线程的基本信息，在程序里有三个线程，想必应该有三块空间，读出fs的内容，可以发现主线程的这个信息存放在0x7ffd f000，看下它的原始数据：
0x7FFDF000 a8 ff 12 00 00 00 13 00 00 10 0e 00 00 00 00 00 ................
0x7FFDF010 00 1e 00 00 00 00 00 00 00 f0 fd 7f 00 00 00 00 ................
0x7FFDF020 30 0e 00 00 d4 07 00 00 00 00 00 00 00 00 00 00 0...............
0x7FFDF030 00 d0 fd 7f b7 00 00 00 00 00 00 00 00 00 00 00 ................
0x7FFDF040 00 b3 6e e3 00 00 00 00 00 00 00 00 00 00 00 00 ..n.............
将之转换为NT_TIB结构体：

ExceptionList	0x0012ffa8	_EXCEPTION_REGISTRATION_RECORD *
StackBase	0x00130000	void *
StackLimit	0x000e1000	void *
SubSystemTib	0x00000000	void *
FiberData	0x00001e00	void *
Version	0x00000000	unsigned long
ArbitraryUserPointer	0x7ffdf000	void *

使用同样的方法，可以得到另一个线程的NT_TIB存放在0x7ffd e0000。
0x7FFDE000 dc ff cd 00 00 00 ce 00 00 a0 cd 00 00 00 00 00 ................
0x7FFDE010 00 1e 00 00 00 00 00 00 00 e0 fd 7f 00 00 00 00 ................
0x7FFDE020 30 0e 00 00 c4 09 00 00 00 00 00 00 00 00 00 00 0...............
0x7FFDE030 00 d0 fd 7f 00 00 00 00 00 00 00 00 00 00 00 00 ................
0x7FFDE040 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
将之转换为NT_TIB结构体：

ExceptionList	0x00cdffdc {Next=0xffffffff Handler=0x7c839ac0 }	_EXCEPTION_REGISTRATION_RECORD *
StackBase	0x00ce0000	void *
StackLimit	0x00cda000	void *
SubSystemTib	0x00000000	void *
FiberData	0x00001e00	void *
Version	0x00001e00	unsigned long
ArbitraryUserPointer	0x00000000	void *

猜想应该是每建一个线程，其空间将往下增长一块。

1.3 其它

还有0x7ffe0000，这一块用途不明，做个记号。

2 参考资料

xp下用户程序空间分配（8）：MEM_MAPPED(2009-8-29)
xp下用户程序空间分配（7）：Heap(2009-8-28)
xp下用户程序空间分配（6）：加载用户DLL(2009-8-28)
xp下用户程序空间分配（5）：加载系统DLL(2009-8-27)
xp下用户程序空间分配（4）：加载主程序(2009-8-27)
xp下用户程序空间分配（3）：加载文件(2009-8-26)
xp下用户程序空间分配（2）：栈(2009-8-26)
xp下用户程序空间分配（1）：大致框架(2009-8-26)