4049 lines
179 KiB
HTML
4049 lines
179 KiB
HTML
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|
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|
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|
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|
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|
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|
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|
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{mso-style-name:"页脚 Char";
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|
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|
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|
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|
||
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|
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|
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|
||
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|
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|
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|
||
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|
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/* Page Definitions */
|
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@page WordSection1
|
||
{size:595.3pt 841.9pt;
|
||
margin:72.0pt 54.0pt 72.0pt 54.0pt;
|
||
layout-grid:15.6pt;}
|
||
div.WordSection1
|
||
{page:WordSection1;}
|
||
/* List Definitions */
|
||
ol
|
||
{margin-bottom:0cm;}
|
||
ul
|
||
{margin-bottom:0cm;}
|
||
-->
|
||
</style>
|
||
|
||
</head>
|
||
|
||
<body lang=ZH-CN link=blue vlink=purple style='text-justify-trim:punctuation'>
|
||
|
||
<div class=WordSection1 style='layout-grid:15.6pt'>
|
||
|
||
<p class=ab><a name="_Toc53320647"><span style='font-family:黑体'>程序</span><span
|
||
lang=EN-US>12-14 linux/fs/exec.c</span></a></p>
|
||
|
||
<div class=a align=center style='text-align:center'><span lang=EN-US>
|
||
|
||
<hr size=4 width="100%" align=center>
|
||
|
||
</span></div>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>1</span></u> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>2</span></u> <b><i> *
|
||
linux/fs/exec.c</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>3</span></u> <b><i> *</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>4</span></u> <b><i> *
|
||
(C) 1991 Linus Torvalds</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>5</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>6</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>7</span></u> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>8</span></u> <b><i> *
|
||
#!-checking implemented by tytso.</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>9</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * #!</span>开始的脚本程序的检测代码部分是由<span
|
||
lang=EN-US>tytso</span>实现的。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>10</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>11</span></u> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>12</span></u> <b><i> *
|
||
Demand-loading implemented 01.12.91 - no need to read anything but</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>13</span></u> <b><i> *
|
||
the header into memory. The inode of the executable is put into</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>14</span></u> <b><i> *
|
||
"current->executable", and page faults do the actual loading.
|
||
Clean.</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>15</span></u> <b><i> *</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>16</span></u> <b><i> *
|
||
Once more I can proudly say that linux stood up to being changed: it</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>17</span></u> <b><i> *
|
||
was less than 2 hours work to get demand-loading completely implemented.</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>18</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>需求时加载实现于<span
|
||
lang=EN-US>1991.12.1 - </span>只需将执行文件头部读进内存而无须将整个</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>执行文件都加载进内存。执行文件的<span
|
||
lang=EN-US>i</span>节点被放在当前进程的可执行字段中</p>
|
||
|
||
<p class=a><span lang=EN-US> * "current->executable"</span>，页异常会进行执行文件的实际加载操作。这很完美。</p>
|
||
|
||
<p class=a><span lang=EN-US> *</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>我可以再一次自豪地说，<span
|
||
lang=EN-US>linux</span>经得起修改：只用了不到<span lang=EN-US>2</span>小时的工作时间就</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>完全实现了需求加载处理。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>19</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>20</span></u>
|
||
#include <signal.h> // </span>信号头文件。定义信号符号常量，信号结构及信号操作函数原型。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>21</span></u>
|
||
#include <errno.h> // </span>错误号头文件。包含系统中各种出错号。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>22</span></u>
|
||
#include <string.h> // </span>字符串头文件。主要定义了一些有关字符串操作的嵌入函数。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>23</span></u>
|
||
#include <sys/stat.h> // </span>文件状态头文件。含有文件状态结构<span
|
||
lang=EN-US>stat{}</span>和符号常量等。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>24</span></u>
|
||
#include <a.out.h> // a.out</span>头文件。定义了<span
|
||
lang=EN-US>a.out</span>执行文件格式和一些宏。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>25</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>26</span></u>
|
||
#include <linux/fs.h> // </span>文件系统头文件。定义文件表结构（<span
|
||
lang=EN-US>file</span>、<span lang=EN-US>m_inode</span>）等。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>27</span></u>
|
||
#include <linux/sched.h> // </span>调度程序头文件，定义了任务结构<span lang=EN-US>task_struct</span>、任务<span
|
||
lang=EN-US>0</span>数据等。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>28</span></u>
|
||
#include <linux/kernel.h> // </span>内核头文件。含有一些内核常用函数的原形定义。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>29</span></u>
|
||
#include <linux/mm.h> // </span>内存管理头文件。含有页面大小定义和一些页面释放函数原型。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>30</span></u>
|
||
#include <asm/segment.h> // </span>段操作头文件。定义了有关段寄存器操作的嵌入式汇编函数。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>31</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>32</span></u>
|
||
extern int <u><span style='color:blue'>sys_exit</span></u>(int exit_code);
|
||
// </span>退出程序系统调用。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>33</span></u>
|
||
extern int <u><span style='color:blue'>sys_close</span></u>(int fd);
|
||
// </span>关闭文件系统调用。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>34</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>35</span></u> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>36</span></u> <b><i> *
|
||
MAX_ARG_PAGES defines the number of pages allocated for arguments</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>37</span></u> <b><i> *
|
||
and envelope for the new program. 32 should suffice, this gives</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>38</span></u> <b><i> *
|
||
a maximum env+arg of 128kB !</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>39</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * MAX_ARG_PAGES</span>定义了为新程序分配的给参数和环境变量使用的最大内存页数。</p>
|
||
|
||
<p class=a><span lang=EN-US> * 32</span>页内存应该足够了，这使得环境和参数（<span
|
||
lang=EN-US>env+arg</span>）空间的总和达到<span lang=EN-US>128kB!</span></p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>40</span></u>
|
||
#define <u><span style='color:blue'>MAX_ARG_PAGES</span></u> 32</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>41</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>使用库文件系统调用。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>library
|
||
- </span>库文件名。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>为进程选择一个库文件，并替换进程当前库文件<span
|
||
lang=EN-US>i</span>节点字段值为这里指定库文件名的<span lang=EN-US>i</span>节点</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>指针。如果<span lang=EN-US>library</span>指针为空，则把进程当前的库文件释放掉。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回：成功返回<span
|
||
lang=EN-US>0</span>，否则返回出错码。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>42</span></u> int
|
||
<u><span style='color:blue'>sys_uselib</span></u>(const char * library)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>43</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>44</span></u>
|
||
struct <u><span style='color:blue'>m_inode</span></u> * inode;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>45</span></u>
|
||
unsigned long base;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>46</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先判断当前进程是否普通进程。这是通过查看当前进程的空间长度来做到的。因为普通进</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>程的空间长度被设置为<span
|
||
lang=EN-US>TASK_SIZE</span>（<span lang=EN-US>64MB</span>）。因此若进程逻辑地址空间长度不等于<span
|
||
lang=EN-US>TASK_SIZE</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>则返回出错码（无效参数）。否则取库文件<span
|
||
lang=EN-US>i</span>节点<span lang=EN-US>inode</span>。若库文件名指针空，则设置<span
|
||
lang=EN-US>inode</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>等于<span lang=EN-US>NULL</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>47</span></u>
|
||
if (<u><span style='color:blue'>get_limit</span></u>(0x17) != <u><span
|
||
style='color:blue'>TASK_SIZE</span></u>)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>48</span></u>
|
||
return -<u><span style='color:blue'>EINVAL</span></u>;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>49</span></u>
|
||
if (library) {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>50</span></u>
|
||
if (!(inode=<u><span style='color:blue'>namei</span></u>(library)))
|
||
<b><i>/* get library inode */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>51</span></u>
|
||
return -<u><span style='color:blue'>ENOENT</span></u>;
|
||
/* </span>取库文件<span lang=EN-US>i</span>节点<span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>52</span></u>
|
||
} else</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>53</span></u>
|
||
inode = <u><span style='color:blue'>NULL</span></u>;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>54</span></u> <b><i>/*
|
||
we should check filetypes (headers etc), but we don't */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /* </span>我们应该检查一下文件类型（如头部信息等），但是我们还没有这样做。<span
|
||
lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后放回进程原库文件<span
|
||
lang=EN-US>i</span>节点，并预置进程库<span lang=EN-US>i</span>节点字段为空。接着取得进程的库代码所在</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>位置，并释放原库代码的页表和所占用的内存页面。最后让进程库<span
|
||
lang=EN-US>i</span>节点字段指向新库<span lang=EN-US>i</span>节</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>点，并返回<span lang=EN-US>0</span>（成功）。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>55</span></u>
|
||
<u><span style='color:blue'>iput</span></u>(<u><span style='color:blue'>current</span></u>->library);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>56</span></u>
|
||
<u><span style='color:blue'>current</span></u>->library = <u><span
|
||
style='color:blue'>NULL</span></u>;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>57</span></u>
|
||
base = <u><span style='color:blue'>get_base</span></u>(<u><span
|
||
style='color:blue'>current</span></u>->ldt[2]);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>58</span></u>
|
||
base += <u><span style='color:blue'>LIBRARY_OFFSET</span></u>;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>59</span></u>
|
||
<u><span style='color:blue'>free_page_tables</span></u>(base,<u><span
|
||
style='color:blue'>LIBRARY_SIZE</span></u>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>60</span></u>
|
||
<u><span style='color:blue'>current</span></u>->library = inode;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>61</span></u>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>62</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>63</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>64</span></u> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>65</span></u> <b><i> *
|
||
create_tables() parses the env- and arg-strings in new user</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>66</span></u> <b><i> *
|
||
memory and creates the pointer tables from them, and puts their</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>67</span></u> <b><i> *
|
||
addresses on the "stack", returning the new stack pointer value.</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>68</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * create_tables()</span>函数在新任务内存中解析环境变量和参数字符串，由此</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>创建指针表，并将它们的地址放到<span
|
||
lang=EN-US>"</span>栈<span lang=EN-US>"</span>上，然后返回新栈的指针值。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>在新任务栈中创建参数和环境变量指针表。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>p
|
||
-</span>数据段中参数和环境信息偏移指针；<span lang=EN-US>argc - </span>参数个数；<span lang=EN-US>envc
|
||
- </span>环境变量个数。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回：栈指针值。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>69</span></u>
|
||
static unsigned long * <u><span style='color:blue'>create_tables</span></u>(char
|
||
* p,int argc,int envc)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>70</span></u> {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>71</span></u>
|
||
unsigned long *<u><span style='color:blue'>argv</span></u>,*<u><span
|
||
style='color:blue'>envp</span></u>;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>72</span></u>
|
||
unsigned long * sp;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>73</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>栈指针是以<span lang=EN-US>4</span>字节（<span
|
||
lang=EN-US>1</span>节）为边界进行寻址的，因此这里需让<span lang=EN-US> sp</span>为<span
|
||
lang=EN-US>4</span>的整数倍值。此时<span lang=EN-US>sp</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>位于参数环境表的末端。然后我们先把<span
|
||
lang=EN-US>sp </span>向下（低地址方向）移动，在栈中空出环境变量</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>指针占用的空间，并让环境变量指针<span
|
||
lang=EN-US>envp </span>指向该处。多空出的一个位置用于在最后存放一</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>个<span lang=EN-US>NULL</span>值。下面指针加<span
|
||
lang=EN-US>1</span>，<span lang=EN-US>sp</span>将递增指针宽度字节值（<span lang=EN-US>4</span>字节）。再把<span
|
||
lang=EN-US>sp</span>向下移动，空出</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>命令行参数指针占用的空间，并让<span
|
||
lang=EN-US>argv </span>指针指向该处。同样，多空处的一个位置用于存放</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>一个<span lang=EN-US>NULL</span>值。此时<span
|
||
lang=EN-US>sp</span>指向参数指针块的起始处，我们将环境参数块指针<span lang=EN-US>envp</span>和命令行参</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>数块指针以及命令行参数个数值分别压入栈中。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>74</span></u>
|
||
sp = (unsigned long *) (0xfffffffc & (unsigned long) p);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>75</span></u>
|
||
sp -= envc+1;
|
||
//
|
||
</span>即<span lang=EN-US>sp = sp - (envc+1);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>76</span></u>
|
||
<u><span style='color:blue'>envp</span></u> = sp;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>77</span></u>
|
||
sp -= argc+1;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>78</span></u>
|
||
<u><span style='color:blue'>argv</span></u> = sp;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>79</span></u>
|
||
<u><span style='color:blue'>put_fs_long</span></u>((unsigned long)<u><span
|
||
style='color:blue'>envp</span></u>,--sp);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>80</span></u>
|
||
<u><span style='color:blue'>put_fs_long</span></u>((unsigned long)<u><span
|
||
style='color:blue'>argv</span></u>,--sp);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>81</span></u>
|
||
<u><span style='color:blue'>put_fs_long</span></u>((unsigned long)argc,--sp);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>再将命令行各参数指针和环境变量各指针分别放入前面空出来的相应地方，最后分别放置一</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>个<span lang=EN-US>NULL</span>指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>82</span></u>
|
||
while (argc-->0) {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>83</span></u>
|
||
<u><span style='color:blue'>put_fs_long</span></u>((unsigned long) p,<u><span
|
||
style='color:blue'>argv</span></u>++);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>84</span></u>
|
||
while (<u><span style='color:blue'>get_fs_byte</span></u>(p++)) <b><i>/*
|
||
nothing */</i></b> ; // p</span>指针指向下一个参数串。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>85</span></u>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>86</span></u>
|
||
<u><span style='color:blue'>put_fs_long</span></u>(0,<u><span style='color:
|
||
blue'>argv</span></u>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>87</span></u>
|
||
while (envc-->0) {</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>88</span></u>
|
||
<u><span style='color:blue'>put_fs_long</span></u>((unsigned long) p,<u><span
|
||
style='color:blue'>envp</span></u>++);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>89</span></u>
|
||
while (<u><span style='color:blue'>get_fs_byte</span></u>(p++)) <b><i>/*
|
||
nothing */</i></b> ; // p</span>指针指向下一个参数串。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>90</span></u>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>91</span></u>
|
||
<u><span style='color:blue'>put_fs_long</span></u>(0,<u><span style='color:
|
||
blue'>envp</span></u>);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>92</span></u>
|
||
return sp;
|
||
// </span>返回构造的当前新栈指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>93</span></u> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>94</span></u> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>95</span></u> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>96</span></u> <b><i> *
|
||
count() counts the number of arguments/envelopes</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>97</span></u> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * count()</span>函数计算命令行参数<span
|
||
lang=EN-US>/</span>环境变量的个数。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>计算参数个数。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>argv
|
||
- </span>参数指针数组，最后一个指针项是<span lang=EN-US>NULL</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>统计参数指针数组中指针的个数。关于函数参数传递指针的指针的作用，请参见程序</p>
|
||
|
||
<p class=a><span lang=EN-US> // kernel/sched.c</span>中第<span
|
||
lang=EN-US>171</span>行前的注释。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回：参数个数。</p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>98</span></u>
|
||
static int <u><span style='color:blue'>count</span></u>(char ** <u><span
|
||
style='color:blue'>argv</span></u>)</span></p>
|
||
|
||
<p class=a><span lang=EN-US> <u><span style='color:blue'>99</span></u> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>100</span></u><span
|
||
lang=EN-US> int i=0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>101</span></u><span
|
||
lang=EN-US> char ** tmp;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>102</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>103</span></u><span
|
||
lang=EN-US> if (tmp = <u><span
|
||
style='color:blue'>argv</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>104</span></u><span
|
||
lang=EN-US>
|
||
while (<u><span style='color:blue'>get_fs_long</span></u>((unsigned long *)
|
||
(tmp++)))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>105</span></u><span
|
||
lang=EN-US>
|
||
i++;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>106</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>107</span></u><span
|
||
lang=EN-US> return i;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>108</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>109</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>110</span></u><span
|
||
lang=EN-US> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>111</span></u><span
|
||
lang=EN-US> <b><i> * 'copy_string()' copies argument/envelope strings from
|
||
user</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>112</span></u><span
|
||
lang=EN-US> <b><i> * memory to free pages in kernel mem. These are in a
|
||
format ready</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>113</span></u><span
|
||
lang=EN-US> <b><i> * to be put directly into the top of new user memory.</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>114</span></u><span
|
||
lang=EN-US> <b><i> *</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>115</span></u><span
|
||
lang=EN-US> <b><i> * Modified by TYT, 11/24/91 to add the from_kmem argument, which specifies</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>116</span></u><span
|
||
lang=EN-US> <b><i> * whether the string and the string array are from user
|
||
or kernel segments:</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>117</span></u><span
|
||
lang=EN-US> <b><i> * </i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>118</span></u><span
|
||
lang=EN-US> <b><i> * from_kmem argv
|
||
* argv **</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>119</span></u><span
|
||
lang=EN-US> <b><i> *
|
||
0 user
|
||
space user space</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>120</span></u><span
|
||
lang=EN-US> <b><i> *
|
||
1 kernel space user
|
||
space</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>121</span></u><span
|
||
lang=EN-US> <b><i> *
|
||
2 kernel space
|
||
kernel space</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>122</span></u><span
|
||
lang=EN-US> <b><i> * </i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>123</span></u><span
|
||
lang=EN-US> <b><i> * We do this by playing games with the fs segment
|
||
register. Since it</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>124</span></u><span
|
||
lang=EN-US> <b><i> * it is expensive to load a segment register, we try to
|
||
avoid calling</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>125</span></u><span
|
||
lang=EN-US> <b><i> * set_fs() unless we absolutely have to.</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>126</span></u><span
|
||
lang=EN-US> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * 'copy_string()'</span>函数从用户内存空间拷贝参数<span
|
||
lang=EN-US>/</span>环境字符串到内核空闲页面中。</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>这些已具有直接放到新用户内存中的格式。</p>
|
||
|
||
<p class=a><span lang=EN-US> *</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>由<span
|
||
lang=EN-US>TYT(Tytso)</span>于<span lang=EN-US>1991.11.24</span>日修改，增加了<span
|
||
lang=EN-US>from_kmem</span>参数，该参数指明了</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>字符串或字符串数组是来自用户段还是内核段。</p>
|
||
|
||
<p class=a><span lang=EN-US> *</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * from_kmem </span>指针<span
|
||
lang=EN-US>argv * </span>字符串<span lang=EN-US> argv **</span></p>
|
||
|
||
<p class=a><span lang=EN-US> *
|
||
0 </span>用户空间<span lang=EN-US>
|
||
</span>用户空间</p>
|
||
|
||
<p class=a><span lang=EN-US> *
|
||
1 </span>内核空间<span lang=EN-US>
|
||
</span>用户空间</p>
|
||
|
||
<p class=a><span lang=EN-US> *
|
||
2 </span>内核空间<span lang=EN-US>
|
||
</span>内核空间</p>
|
||
|
||
<p class=a><span lang=EN-US> *</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>我们是通过巧妙处理<span
|
||
lang=EN-US>fs</span>段寄存器来操作的。由于加载一个段寄存器代价太高，</p>
|
||
|
||
<p class=a><span lang=EN-US> * </span>所以我们尽量避免调用<span
|
||
lang=EN-US>set_fs()</span>，除非实在必要。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>复制指定个数的参数字符串到参数和环境空间中。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>argc
|
||
- </span>欲添加的参数个数；<span lang=EN-US>argv - </span>参数指针数组；<span lang=EN-US>page -
|
||
</span>参数和环境空间页面指针</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>数组。<span lang=EN-US>p
|
||
-</span>参数表空间中偏移指针，始终指向已复制串的头部；<span lang=EN-US>from_kmem -</span>字符串来源标志。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>在 <span lang=EN-US>do_execve()</span>函数中，<span
|
||
lang=EN-US>p</span>初始化为指向参数表<span lang=EN-US>(128kB)</span>空间的最后一个长字处，参数字符串</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>是以堆栈操作方式逆向往其中复制存放的。因此 <span
|
||
lang=EN-US>p</span>指针会随着复制信息的增加而逐渐减小，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>并始终指向参数字符串的头部。字符串来源标志<span
|
||
lang=EN-US>from_kmem</span>应该是<span lang=EN-US>TYT</span>为了给<span lang=EN-US>execve()</span>增添</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>执行脚本文件的功能而新加的参数。当没有运行脚本文件的功能时，所有参数字符串都在用</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>户数据空间中。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回：参数和环境空间当前头部指针。若出错则返回<span
|
||
lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>127</span></u><span
|
||
lang=EN-US> static unsigned long <u><span style='color:blue'>copy_strings</span></u>(int
|
||
argc,char ** <u><span style='color:blue'>argv</span></u>,unsigned long *page,</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>128</span></u><span
|
||
lang=EN-US>
|
||
unsigned long p, int from_kmem)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>129</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>130</span></u><span
|
||
lang=EN-US> char *tmp, *pag;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>131</span></u><span
|
||
lang=EN-US> int len, offset =
|
||
0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>132</span></u><span
|
||
lang=EN-US> unsigned long
|
||
old_fs, new_fs;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>133</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先取当前段寄存器<span
|
||
lang=EN-US>ds</span>（指向内核数据段）和<span lang=EN-US>fs</span>值，分别保存到变量<span
|
||
lang=EN-US>new_fs</span>和<span lang=EN-US>old_fs</span>中。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果字符串和字符串数组（指针）来自内核空间，则设置<span
|
||
lang=EN-US>fs</span>段寄存器指向内核数据段。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>134</span></u><span
|
||
lang=EN-US> if (!p)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>135</span></u><span
|
||
lang=EN-US>
|
||
return 0; <b><i>/* bullet-proofing */</i></b>
|
||
/* </span>偏移指针验证<span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>136</span></u><span
|
||
lang=EN-US> new_fs = <u><span
|
||
style='color:blue'>get_ds</span></u>();</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>137</span></u><span
|
||
lang=EN-US> old_fs = <u><span
|
||
style='color:blue'>get_fs</span></u>();</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>138</span></u><span
|
||
lang=EN-US> if (from_kmem==2)
|
||
// </span>若串及其指针在内核空间则设置<span lang=EN-US>fs</span>指向内核空间。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>139</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>set_fs</span></u>(new_fs);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后循环处理各个参数，从最后一个参数逆向开始复制，复制到指定偏移地址处。在循环中，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先取需要复制的当前字符串指针。如果字符串在用户空间而字符串数组（字符串指针）在</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>内核空间，则设置<span
|
||
lang=EN-US>fs</span>段寄存器指向内核数据段（<span lang=EN-US>ds</span>）。并在内核数据空间中取了字符串指针</p>
|
||
|
||
<p class=a><span lang=EN-US> // tmp</span>之后就立刻恢复<span
|
||
lang=EN-US>fs</span>段寄存器原值（<span lang=EN-US>fs</span>再指回用户空间）。否则不用修改<span
|
||
lang=EN-US>fs</span>值而直接从</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>用户空间取字符串指针到<span
|
||
lang=EN-US>tmp</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>140</span></u><span
|
||
lang=EN-US> while (argc-- >
|
||
0) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>141</span></u><span
|
||
lang=EN-US>
|
||
if (from_kmem == 1) // </span>若串指针在内核空间，则<span
|
||
lang=EN-US>fs</span>指向内核空间。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>142</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>set_fs</span></u>(new_fs);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>143</span></u><span
|
||
lang=EN-US>
|
||
if (!(tmp = (char *)<u><span style='color:blue'>get_fs_long</span></u>(((unsigned
|
||
long *)<u><span style='color:blue'>argv</span></u>)+argc)))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>144</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"argc is wrong"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>145</span></u><span
|
||
lang=EN-US>
|
||
if (from_kmem == 1) // </span>若串指针在内核空间，则<span
|
||
lang=EN-US>fs</span>指回用户空间。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>146</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>set_fs</span></u>(old_fs);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后从用户空间取该字符串，并计算该参数字符串长度<span
|
||
lang=EN-US>len</span>。 此后<span lang=EN-US>tmp</span>指向该字符串末端。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果该字符串长度超过此时参数和环境空间中还剩余的空闲长度，则空间不够了。于是恢复</p>
|
||
|
||
<p class=a><span lang=EN-US> // fs</span>段寄存器值（如果被改变的话）并返回<span
|
||
lang=EN-US>0</span>。不过因为参数和环境空间留有<span lang=EN-US>128KB</span>，所以通</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>常不可能发生这种情况。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>147</span></u><span
|
||
lang=EN-US>
|
||
len=0; <b><i>/*
|
||
remember zero-padding */</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>148</span></u><span
|
||
lang=EN-US>
|
||
do { /*
|
||
</span>我们知道串是以<span lang=EN-US>NULL</span>字节结尾的<span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>149</span></u><span
|
||
lang=EN-US>
|
||
len++;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>150</span></u><span
|
||
lang=EN-US> }
|
||
while (<u><span style='color:blue'>get_fs_byte</span></u>(tmp++));</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>151</span></u><span
|
||
lang=EN-US>
|
||
if (p-len < 0) { <b><i>/*
|
||
this shouldn't happen - 128kB */</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>152</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>set_fs</span></u>(old_fs);
|
||
/* </span>不会发生<span lang=EN-US>-</span>因为有<span lang=EN-US>128kB</span>的空间<span
|
||
lang=EN-US> */</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>153</span></u><span
|
||
lang=EN-US>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>154</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>接着我们逆向逐个字符地把字符串复制到参数和环境空间末端处。在循环复制字符串的字符</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>过程中，我们首先要判断参数和环境空间中相应位置处是否已经有内存页面。如果还没有就</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>先为其申请<span lang=EN-US>1</span>页内存页面。偏移量<span
|
||
lang=EN-US>offset</span>被用作为在一个页面中的当前指针偏移值。 因为</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>刚开始执行本函数时，偏移变量<span
|
||
lang=EN-US>offset</span>被初始化为<span lang=EN-US>0</span>，所以<span lang=EN-US>(offset-1
|
||
< 0)</span>肯定成立而使得</p>
|
||
|
||
<p class=a><span lang=EN-US> // offset</span>重新被设置为当前<span
|
||
lang=EN-US>p</span>指针在页面范围内的偏移值。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>155</span></u><span
|
||
lang=EN-US>
|
||
while (len) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>156</span></u><span
|
||
lang=EN-US>
|
||
--p; --tmp; --len;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>157</span></u><span
|
||
lang=EN-US>
|
||
if (--offset < 0) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>158</span></u><span
|
||
lang=EN-US>
|
||
offset = p % <u><span style='color:blue'>PAGE_SIZE</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>159</span></u><span
|
||
lang=EN-US>
|
||
if (from_kmem==2) // </span>若串在内核空间则<span lang=EN-US>fs</span>指回用户空间。 </p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>160</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>set_fs</span></u>(old_fs);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果当前偏移值<span
|
||
lang=EN-US>p</span>所在的串空间页面指针数组项 <span lang=EN-US>page[p/PAGE_SIZE] ==0</span>，表示此时<span
|
||
lang=EN-US>p</span>指针</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>所处的空间内存页面还不存在，则需申请一空闲内存页，并将该页面指针填入指针数组，同</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>时也使页面指针<span
|
||
lang=EN-US>pag</span>指向该新页面。若申请不到空闲页面则返回<span lang=EN-US>0</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>161</span></u><span
|
||
lang=EN-US>
|
||
if (!(pag = (char *) page[p/<u><span style='color:blue'>PAGE_SIZE</span></u>])
|
||
&&</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>162</span></u><span
|
||
lang=EN-US>
|
||
!(pag = (char *) page[p/<u><span style='color:blue'>PAGE_SIZE</span></u>] =</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>163</span></u><span
|
||
lang=EN-US>
|
||
(unsigned long *) <u><span style='color:blue'>get_free_page</span></u>())) </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>164</span></u><span
|
||
lang=EN-US>
|
||
return 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>165</span></u><span
|
||
lang=EN-US>
|
||
if (from_kmem==2) // </span>若串在内核空间则<span lang=EN-US>fs</span>指向内核空间。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>166</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>set_fs</span></u>(new_fs);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>167</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>168</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后从<span lang=EN-US>fs</span>段中复制字符串的<span
|
||
lang=EN-US>1</span>字节到参数和环境空间内存页面<span lang=EN-US>pag</span>的<span lang=EN-US>offset</span>处。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>169</span></u><span
|
||
lang=EN-US>
|
||
*(pag + offset) = <u><span style='color:blue'>get_fs_byte</span></u>(tmp);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>170</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>171</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果字符串和字符串数组在内核空间，则恢复<span
|
||
lang=EN-US>fs</span>段寄存器原值。最后，返回参数和环境空</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>间中已复制参数的头部偏移值。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>172</span></u><span
|
||
lang=EN-US> if (from_kmem==2)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>173</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>set_fs</span></u>(old_fs);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>174</span></u><span
|
||
lang=EN-US> return p;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>175</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>176</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// </span>修改任务的局部描述符表内容。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>修改局部描述符表<span
|
||
lang=EN-US>LDT</span>中描述符的段基址和段限长，并将参数和环境空间页面放置在数据段</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>末端。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：<span lang=EN-US>text_size
|
||
- </span>执行文件头部中<span lang=EN-US>a_text</span>字段给出的代码段长度值；</p>
|
||
|
||
<p class=a><span lang=EN-US> // page - </span>参数和环境空间页面指针数组。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回：数据段限长值（<span
|
||
lang=EN-US>64MB</span>）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>177</span></u><span
|
||
lang=EN-US> static unsigned long <u><span style='color:blue'>change_ldt</span></u>(unsigned
|
||
long text_size,unsigned long * page)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>178</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>179</span></u><span
|
||
lang=EN-US> unsigned long
|
||
code_limit,data_limit,code_base,data_base;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>180</span></u><span
|
||
lang=EN-US> int i;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>181</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>首先把代码和数据段长度均设置为<span
|
||
lang=EN-US>64MB</span>。 然后取当前进程局部描述符表代码段描述符中代</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>码段基址。代码段基址与数据段基址相同。再使用这些新值重新设置局部表中代码段和数据</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>段描述符中的基址和段限长。这里请注意，由于被加载的新程序的代码和数据段基址与原程</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>序的相同，因此没有必要再重复去设置它们，即第<span
|
||
lang=EN-US>186</span>和<span lang=EN-US>188</span>行上的两条设置段基址的语句</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>多余，可省略。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>182</span></u><span
|
||
lang=EN-US> code_limit = <u><span
|
||
style='color:blue'>TASK_SIZE</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>183</span></u><span
|
||
lang=EN-US> data_limit = <u><span
|
||
style='color:blue'>TASK_SIZE</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>184</span></u><span
|
||
lang=EN-US> code_base = <u><span
|
||
style='color:blue'>get_base</span></u>(<u><span style='color:blue'>current</span></u>->ldt[1]);
|
||
// include/linux/sched.h</span>，第<span lang=EN-US>226</span>行。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>185</span></u><span
|
||
lang=EN-US> data_base =
|
||
code_base;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>186</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>set_base</span></u>(<u><span style='color:blue'>current</span></u>->ldt[1],code_base);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>187</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>set_limit</span></u>(<u><span style='color:blue'>current</span></u>->ldt[1],code_limit);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>188</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>set_base</span></u>(<u><span style='color:blue'>current</span></u>->ldt[2],data_base);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>189</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>set_limit</span></u>(<u><span style='color:blue'>current</span></u>->ldt[2],data_limit);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>190</span></u><span
|
||
lang=EN-US> <b><i>/* make sure fs points to the NEW data segment */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /* </span>要确信<span lang=EN-US>fs</span>段寄存器已指向新的数据段<span
|
||
lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // fs</span>段寄存器中放入局部表数据段描述符的选择符<span
|
||
lang=EN-US>(0x17)</span>。即默认情况下<span lang=EN-US>fs</span>都指向任务数据段。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>191</span></u><span
|
||
lang=EN-US> __asm__(<i>"pushl
|
||
$0x17\n\tpop %%fs"</i>::);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后将参数和环境空间已存放数据的页面（最多有<span
|
||
lang=EN-US>MAX_ARG_PAGES</span>页，<span lang=EN-US>128kB</span>）放到数据段末</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>端。 方法是从进程空间库代码位置开始处逆向一页一页地放。库文件代码占用进程空间最后</p>
|
||
|
||
<p class=a><span lang=EN-US> // 4MB</span>。函数<span
|
||
lang=EN-US>put_dirty_page()</span>用于把物理页面映射到进程逻辑空间中。在<span lang=EN-US>mm/memory.c</span>中。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>192</span></u><span
|
||
lang=EN-US> data_base +=
|
||
data_limit - <u><span style='color:blue'>LIBRARY_SIZE</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>193</span></u><span
|
||
lang=EN-US> for (i=<u><span
|
||
style='color:blue'>MAX_ARG_PAGES</span></u>-1 ; i>=0 ; i--) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>194</span></u><span
|
||
lang=EN-US>
|
||
data_base -= <u><span style='color:blue'>PAGE_SIZE</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>195</span></u><span
|
||
lang=EN-US>
|
||
if (page[i])
|
||
// </span>若该页面存在，就放置该页面。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>196</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>put_dirty_page</span></u>(page[i],data_base);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>197</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>198</span></u><span
|
||
lang=EN-US> return data_limit;
|
||
// </span>最后返回数据段限长（<span lang=EN-US>64MB</span>）。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>199</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>200</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>201</span></u><span
|
||
lang=EN-US> <b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>202</span></u><span
|
||
lang=EN-US> <b><i> * 'do_execve()' executes a new program.</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>203</span></u><span
|
||
lang=EN-US> <b><i> *</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>204</span></u><span
|
||
lang=EN-US> <b><i> * NOTE! We leave 4MB free at the top of the data-area
|
||
for a loadable</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>205</span></u><span
|
||
lang=EN-US> <b><i> * library.</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>206</span></u><span
|
||
lang=EN-US> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> * 'do_execve()'</span>函数执行一个新程序。</p>
|
||
|
||
<p class=a><span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> //// execve()</span>系统中断调用函数。加载并执行子进程（其他程序）。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该函数是系统中断调用（<span
|
||
lang=EN-US>int 0x80</span>）功能号<span lang=EN-US>__NR_execve</span>调用的函数。函数的参数是进入系统</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>调用处理过程后直到调用本系统调用处理过程（<span
|
||
lang=EN-US>system_call.s</span>第<span lang=EN-US>200</span>行）和调用本函数之前</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>（<span lang=EN-US>system_call.s</span>，第<span
|
||
lang=EN-US>203</span>行）逐步压入栈中的值。这些值包括：</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>① 第<span lang=EN-US>86--88</span>行入堆的<span
|
||
lang=EN-US>edx</span>、<span lang=EN-US>ecx</span>和<span lang=EN-US>ebx</span>寄存器值，分别对应<span
|
||
lang=EN-US>**envp</span>、<span lang=EN-US>**argv</span>和<span lang=EN-US>*filename</span>；</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>② 第<span lang=EN-US>94</span>行调用<span
|
||
lang=EN-US>sys_call_table</span>中<span lang=EN-US>sys_execve</span>函数（指针）时压入栈的函数返回地址（<span
|
||
lang=EN-US>tmp</span>）；</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>③ 第<span lang=EN-US>202</span>行在调用本函数<span
|
||
lang=EN-US>do_execve</span>前入栈的指向栈中调用系统中断的程序代码指针<span lang=EN-US>eip</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数：</p>
|
||
|
||
<p class=a><span lang=EN-US> // eip - </span>调用系统中断的程序代码指针，参见<span
|
||
lang=EN-US>kernel/system_call.s</span>程序开始部分的说明；</p>
|
||
|
||
<p class=a><span lang=EN-US> // tmp - </span>系统中断中在调用<span
|
||
lang=EN-US>_sys_execve</span>时的返回地址，无用；</p>
|
||
|
||
<p class=a><span lang=EN-US> // filename - </span>被执行程序文件名指针；</p>
|
||
|
||
<p class=a><span lang=EN-US> // argv - </span>命令行参数指针数组的指针；</p>
|
||
|
||
<p class=a><span lang=EN-US> // envp - </span>环境变量指针数组的指针。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回：如果调用成功，则不返回；否则设置出错号，并返回<span
|
||
lang=EN-US>-1</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>207</span></u><span
|
||
lang=EN-US> int <u><span style='color:blue'>do_execve</span></u>(unsigned long
|
||
* eip,long tmp,char * filename,</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>208</span></u><span
|
||
lang=EN-US> char ** <u><span
|
||
style='color:blue'>argv</span></u>, char ** <u><span style='color:blue'>envp</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>209</span></u><span
|
||
lang=EN-US> {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>210</span></u><span
|
||
lang=EN-US> struct <u><span
|
||
style='color:blue'>m_inode</span></u> * inode;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>211</span></u><span
|
||
lang=EN-US> struct <u><span
|
||
style='color:blue'>buffer_head</span></u> * bh;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>212</span></u><span
|
||
lang=EN-US> struct <u><span
|
||
style='color:blue'>exec</span></u> ex;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>213</span></u><span
|
||
lang=EN-US> unsigned long page[<u><span
|
||
style='color:blue'>MAX_ARG_PAGES</span></u>];
|
||
// </span>参数和环境串空间页面指针数组。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>214</span></u><span
|
||
lang=EN-US> int i,argc,envc;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>215</span></u><span
|
||
lang=EN-US> int e_uid, e_gid;
|
||
// </span>有效用户<span lang=EN-US>ID</span>和有效组<span lang=EN-US>ID</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>216</span></u><span
|
||
lang=EN-US> int retval;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>217</span></u><span
|
||
lang=EN-US> int sh_bang = 0;
|
||
// </span>控制是否需要执行脚本程序。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>218</span></u><span
|
||
lang=EN-US> unsigned long p=<u><span
|
||
style='color:blue'>PAGE_SIZE</span></u>*<u><span style='color:blue'>MAX_ARG_PAGES</span></u>-4;
|
||
// p</span>指向参数和环境空间的最后部。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>219</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>在正式设置执行文件的运行环境之前，让我们先干些杂事。内核准备了<span
|
||
lang=EN-US>128KB</span>（<span lang=EN-US>32</span>个页面）</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>空间来存放化执行文件的命令行参数和环境字符串。上行把<span
|
||
lang=EN-US>p</span>初始设置成位于<span lang=EN-US>128KB</span>空间的</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>最后<span lang=EN-US>1</span>个长字处。在初始参数和环境空间的操作过程中，<span
|
||
lang=EN-US>p</span>将用来指明在<span lang=EN-US>128KB</span>空间中的当</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>前位置。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>另外，参数<span lang=EN-US>eip[1]</span>是调用本次系统调用的原用户程序代码段寄存器<span
|
||
lang=EN-US>CS</span>值，其中的段选择符</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>当然必须是当前任务的代码段选择符（<span
|
||
lang=EN-US>0x000f</span>）。若不是该值，那么<span
|
||
lang=EN-US> CS</span>只能会是内核代码</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>段的选择符<span lang=EN-US>
|
||
0x0008</span>。 但这是绝对不允许的，因为内核代码是常驻内存而不能被替换掉的。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>因此下面根据<span
|
||
lang=EN-US>eip[1] </span>的值确认是否符合正常情况。然后再初始化<span lang=EN-US>128KB</span>的参数和环境串空</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>间，把所有字节清零，并取出执行文件的<span
|
||
lang=EN-US>i</span>节点。再根据函数参数分别计算出命令行参数和</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>环境字符串的个数<span
|
||
lang=EN-US>argc</span>和<span lang=EN-US>envc</span>。另外，执行文件必须是常规文件。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>220</span></u><span
|
||
lang=EN-US> if ((0xffff &
|
||
eip[1]) != 0x000f)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>221</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>panic</span></u>(<i>"execve called from
|
||
supervisor mode"</i>);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>222</span></u><span
|
||
lang=EN-US> for (i=0 ; i<<u><span
|
||
style='color:blue'>MAX_ARG_PAGES</span></u> ;
|
||
i++) <b><i>/* clear page-table */</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>223</span></u><span
|
||
lang=EN-US>
|
||
page[i]=0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>224</span></u><span
|
||
lang=EN-US> if (!(inode=<u><span
|
||
style='color:blue'>namei</span></u>(filename)))
|
||
<b><i>/* get executables inode */</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>225</span></u><span
|
||
lang=EN-US>
|
||
return -<u><span style='color:blue'>ENOENT</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>226</span></u><span
|
||
lang=EN-US> argc = <u><span
|
||
style='color:blue'>count</span></u>(<u><span style='color:blue'>argv</span></u>);
|
||
// </span>命令行参数个数。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>227</span></u><span
|
||
lang=EN-US> envc = <u><span
|
||
style='color:blue'>count</span></u>(<u><span style='color:blue'>envp</span></u>);
|
||
// </span>环境字符串变量个数。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>228</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>229</span></u><span
|
||
lang=EN-US> restart_interp:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>230</span></u><span
|
||
lang=EN-US> if (!<u><span
|
||
style='color:blue'>S_ISREG</span></u>(inode->i_mode)) { <b><i>/*
|
||
must be regular file */</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>231</span></u><span
|
||
lang=EN-US>
|
||
retval = -<u><span style='color:blue'>EACCES</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>232</span></u><span
|
||
lang=EN-US>
|
||
goto exec_error2; //</span>若不是常规文件则置出错码，跳转到<span
|
||
lang=EN-US>376</span>行。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>233</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>下面检查当前进程是否有权运行指定的执行文件。即根据执行文件<span
|
||
lang=EN-US>i</span>节点中的属性，看看本</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>进程是否有权执行它。在把执行文件<span
|
||
lang=EN-US>i</span>节点的属性字段值取到<span lang=EN-US>i</span>中后，我们首先查看属性中</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>是否设置了“设置<span
|
||
lang=EN-US>-</span>用户<span lang=EN-US>-ID</span>”（<span lang=EN-US>set-user_id</span>）标志
|
||
和“设置<span lang=EN-US>-</span>组<span lang=EN-US>-ID</span>”（<span lang=EN-US>set-group-id</span>）标</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>志。这两个标志主要是让一般用户能够执行特权用户（如超级用户<span
|
||
lang=EN-US>root</span>）的程序，例如改变</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>密码的程序<span lang=EN-US>passwd</span>等。如果<span
|
||
lang=EN-US>set-user-id</span>标志置位，则后面执行进程的有效用户<span lang=EN-US>ID</span>（<span
|
||
lang=EN-US>euid</span>）</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>就设置成执行文件的用户<span
|
||
lang=EN-US>ID</span>，否则设置成当前进程的<span lang=EN-US>euid</span>。如果执行文件<span
|
||
lang=EN-US>set-group-id</span>被</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>置位的话，则执行进程的有效组<span
|
||
lang=EN-US>ID</span>（<span lang=EN-US>egid</span>）就设置为执行文件的组<span lang=EN-US>ID</span>。否则设置成当前进程</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>的<span lang=EN-US>egid</span>。这里暂时把这两个判断出来的值保存在变量<span
|
||
lang=EN-US>e_uid</span>和<span lang=EN-US>e_gid</span>中。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>234</span></u><span
|
||
lang=EN-US> i =
|
||
inode->i_mode;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>235</span></u><span
|
||
lang=EN-US> e_uid = (i & <u><span
|
||
style='color:blue'>S_ISUID</span></u>) ? inode->i_uid : <u><span
|
||
style='color:blue'>current</span></u>->euid;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>236</span></u><span
|
||
lang=EN-US> e_gid = (i & <u><span
|
||
style='color:blue'>S_ISGID</span></u>) ? inode->i_gid : <u><span
|
||
style='color:blue'>current</span></u>->egid;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>现在根据进程的<span
|
||
lang=EN-US>euid</span>和<span lang=EN-US>egid</span>和执行文件的访问属性进行比较。如果执行文件属于运行进程</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>的用户，则把文件属性值<span
|
||
lang=EN-US>i</span>右移<span lang=EN-US>6</span>位，此时其最低<span lang=EN-US>3</span>位是文件宿主的访问权限标志。否则的</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>话如果执行文件与当前进程的用户属于同组，则使属性值最低<span
|
||
lang=EN-US>3</span>位是执行文件组用户的访问</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>权限标志。否则此时属性字最低<span
|
||
lang=EN-US>3</span>位就是其他用户访问该执行文件的权限。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后我们根据属性字<span
|
||
lang=EN-US>i</span>的最低<span lang=EN-US>3</span>比特值来判断当前进程是否有权限运行这个执行文件。如果</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>选出的相应用户没有运行改文件的权力（位<span
|
||
lang=EN-US>0</span>是执行权限），并且其他用户也没有任何权限</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>或者当前进程用户不是超级用户，则表明当前进程没有权力运行这个执行文件。于是置不可</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>执行出错码，并跳转到<span
|
||
lang=EN-US>exec_error2</span>处去作退出处理。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>237</span></u><span
|
||
lang=EN-US> if (<u><span
|
||
style='color:blue'>current</span></u>->euid == inode->i_uid)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>238</span></u><span
|
||
lang=EN-US>
|
||
i >>= 6;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>239</span></u><span
|
||
lang=EN-US> else if (<u><span
|
||
style='color:blue'>in_group_p</span></u>(inode->i_gid))</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>240</span></u><span
|
||
lang=EN-US>
|
||
i >>= 3;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>241</span></u><span
|
||
lang=EN-US> if (!(i & 1)
|
||
&&</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>242</span></u><span
|
||
lang=EN-US>
|
||
!((inode->i_mode & 0111) && <u><span style='color:blue'>suser</span></u>()))
|
||
{</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>243</span></u><span
|
||
lang=EN-US>
|
||
retval = -<u><span style='color:blue'>ENOEXEC</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>244</span></u><span
|
||
lang=EN-US> goto
|
||
exec_error2;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>245</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>程序执行到这里，说明当前进程有运行指定执行文件的权限。因此从这里开始我们需要取出</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>执行文件头部数据并根据其中的信息来分析设置运行环境，或者运行另一个<span
|
||
lang=EN-US>shell</span>程序来执</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>行脚本程序。首先读取执行文件第<span
|
||
lang=EN-US>1</span>块数据到高速缓冲块中。 并复制缓冲块数据到<span lang=EN-US>ex</span>中。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果执行文件开始的两个字节是字符<span
|
||
lang=EN-US>'#!'</span>，则说明执行文件是一个脚本文本文件。如果想运</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>行脚本文件，我们就需要执行脚本文件的解释程序（例如<span
|
||
lang=EN-US>shell</span>程序）。通常脚本文件的第</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>一行文本为“<span
|
||
lang=EN-US>#</span>！<span lang=EN-US>/bin/bash</span>”。它指明了运行脚本文件需要的解释程序。运行方法是从脚本</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>文件第<span lang=EN-US>1</span>行（带字符<span
|
||
lang=EN-US>'#!'</span>）中取出其中的解释程序名及后面的参数（若有的话），然后将这</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>些参数和脚本文件名放进执行文件（此时是解释程序）的命令行参数空间中。在这之前我们</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>当然需要先把函数指定的原有命令行参数和环境字符串放到<span
|
||
lang=EN-US>128KB</span>空间中，而这里建立起来</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>的命令行参数则放到它们前面位置处（因为是逆向放置）。最后让内核执行脚本文件的解释</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>程序。下面就是在设置好解释程序的脚本文件名等参数后，取出解释程序的<span
|
||
lang=EN-US>i</span>节点并跳转到</p>
|
||
|
||
<p class=a><span lang=EN-US> // 229</span>行去执行解释程序。由于我们需要跳转到执行过的代码<span
|
||
lang=EN-US>229</span>行去，因此在下面确认并处</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>理了脚本文件之后需要设置一个禁止再次执行下面的脚本处理代码标志<span
|
||
lang=EN-US>sh_bang </span>。在后面的</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>代码中该标志也用来表示我们已经设置好执行文件的命令行参数，不要重复设置。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>246</span></u><span
|
||
lang=EN-US> if (!(bh = <u><span
|
||
style='color:blue'>bread</span></u>(inode->i_dev,inode->i_zone[0]))) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>247</span></u><span
|
||
lang=EN-US>
|
||
retval = -<u><span style='color:blue'>EACCES</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>248</span></u><span
|
||
lang=EN-US>
|
||
goto exec_error2;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>249</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>250</span></u><span
|
||
lang=EN-US> ex = *((struct <u><span
|
||
style='color:blue'>exec</span></u> *) bh->b_data); <b><i>/*
|
||
read exec-header */</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>251</span></u><span
|
||
lang=EN-US> if
|
||
((bh->b_data[0] == <i>'#'</i>) && (bh->b_data[1] == <i>'!'</i>)
|
||
&& (!sh_bang)) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>252</span></u><span
|
||
lang=EN-US>
|
||
<b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>253</span></u><span
|
||
lang=EN-US> <b><i> *
|
||
This section does the #! interpretation.</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>254</span></u><span
|
||
lang=EN-US> <b><i> *
|
||
Sorta complicated, but hopefully it will work. -TYT</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>255</span></u><span
|
||
lang=EN-US> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
/*</span></p>
|
||
|
||
<p class=a><span lang=EN-US> *
|
||
</span>这部分处理对<span lang=EN-US>'#!'</span>的解释，有些复杂，但希望能工作。<span lang=EN-US>-TYT</span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
*/</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>256</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>257</span></u><span
|
||
lang=EN-US>
|
||
char <u><span style='color:blue'>buf</span></u>[128], *cp, *interp, *i_name,
|
||
*i_arg;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>258</span></u><span
|
||
lang=EN-US>
|
||
unsigned long old_fs;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>259</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>从这里开始，我们从脚本文件中提取解释程序名及其参数，并把解释程序名、解释程序的参数</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>和脚本文件名组合放入环境参数块中。首先复制脚本文件头<span
|
||
lang=EN-US>1</span>行字符<span lang=EN-US>'#!'</span>后面的字符串到<span lang=EN-US>buf</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>中，其中含有脚本解释程序名（例如<span
|
||
lang=EN-US>/bin/sh</span>），也可能还包含解释程序的几个参数。然后对</p>
|
||
|
||
<p class=a><span lang=EN-US> // buf</span>中的内容进行处理。删除开始的空格、制表符。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>260</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>strncpy</span></u>(<u><span style='color:blue'>buf</span></u>,
|
||
bh->b_data+2, 127);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>261</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>brelse</span></u>(bh);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>262</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>iput</span></u>(inode);
|
||
// </span>释放缓冲块并放回脚本文件<span lang=EN-US>i</span>节点。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>263</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>buf</span></u>[127] = <i>'\0'</i>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>264</span></u><span
|
||
lang=EN-US>
|
||
if (cp = <u><span style='color:blue'>strchr</span></u>(<u><span
|
||
style='color:blue'>buf</span></u>, <i>'\n'</i>)) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>265</span></u><span
|
||
lang=EN-US>
|
||
*cp = <i>'\0'</i>; // </span>第<span
|
||
lang=EN-US>1</span>个换行符换成<span lang=EN-US>NULL</span>并去掉空格制表符。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>266</span></u><span
|
||
lang=EN-US>
|
||
for (cp = <u><span style='color:blue'>buf</span></u>; (*cp == <i>' '</i>) ||
|
||
(*cp == <i>'\t'</i>); cp++);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>267</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>268</span></u><span
|
||
lang=EN-US>
|
||
if (!cp || *cp == <i>'\0'</i>) { // </span>若该行没有其他内容，则出错。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>269</span></u><span
|
||
lang=EN-US>
|
||
retval = -<u><span style='color:blue'>ENOEXEC</span></u>; <b><i>/*
|
||
No interpreter name found */</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>270</span></u><span
|
||
lang=EN-US>
|
||
goto exec_error1; /* </span>没有找到脚本解释程序名<span
|
||
lang=EN-US> */</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>271</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>此时我们得到了开头是脚本解释程序名的一行内容（字符串）。下面分析该行。首先取第一个</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>字符串，它应该是解释程序名，此时<span
|
||
lang=EN-US>i_name</span>指向该名称。若解释程序名后还有字符，则它们应</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>该是解释程序的参数串，于是令<span
|
||
lang=EN-US>i_arg</span>指向该串。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>272</span></u><span
|
||
lang=EN-US>
|
||
interp = i_name = cp;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>273</span></u><span
|
||
lang=EN-US>
|
||
i_arg = 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>274</span></u><span
|
||
lang=EN-US>
|
||
for ( ; *cp && (*cp != <i>' '</i>) && (*cp != <i>'\t'</i>);
|
||
cp++) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>275</span></u><span
|
||
lang=EN-US>
|
||
if (*cp == <i>'/'</i>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>276</span></u><span
|
||
lang=EN-US>
|
||
i_name = cp+1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>277</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>278</span></u><span
|
||
lang=EN-US>
|
||
if (*cp) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>279</span></u><span
|
||
lang=EN-US>
|
||
*cp++ = <i>'\0'</i>;
|
||
// </span>解释程序名尾添加<span lang=EN-US>NULL</span>字符。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>280</span></u><span
|
||
lang=EN-US>
|
||
i_arg = cp;
|
||
// i_arg</span>指向解释程序参数。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>281</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>282</span></u><span
|
||
lang=EN-US>
|
||
<b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>283</span></u><span
|
||
lang=EN-US> <b><i> *
|
||
OK, we've parsed out the interpreter name and</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>284</span></u><span
|
||
lang=EN-US> <b><i> *
|
||
(optional) argument.</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>285</span></u><span
|
||
lang=EN-US> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
/*</span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* OK</span>，我们已经解析出解释程序的文件名以及<span lang=EN-US>(</span>可选的<span lang=EN-US>)</span>参数。</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
*/</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>现在我们要把上面解析出来的解释程序名<span
|
||
lang=EN-US>i_name </span>及其参数<span lang=EN-US>i_arg </span>和脚本文件名作为解释程</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>序的参数放进环境和参数块中。不过首先我们需要把函数提供的原来一些参数和环境字符串</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>先放进去，然后再放这里解析出来的。例如对于命令行参数来说，如果原来的参数是<span
|
||
lang=EN-US>"-arg1</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // -arg2"</span>、解释程序名是<span
|
||
lang=EN-US>"bash"</span>、其参数是<span lang=EN-US>"-iarg1
|
||
-iarg2"</span>、脚本文件名（即原来的执行文</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>件名）是<span lang=EN-US>"example.sh"</span>，那么在放入这里的参数之后，新的命令行类似于这样：</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
// </span>“<span lang=EN-US>bash
|
||
-iarg1 -iarg2 example.sh -arg1 -arg2<span
|
||
lang=EN-US><span lang=EN-US>”</span></span></span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>这里我们把<span lang=EN-US>sh_bang</span>标志置上，然后把函数参数提供的原有参数和环境字符串放入到空间中。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>环境字符串和参数个数分别是<span
|
||
lang=EN-US>envc </span>和<span lang=EN-US>argc-1</span>个。少复制的一个原有参数是原来的执行文件</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>名，即这里的脚本文件名。<span
|
||
lang=EN-US>[[?? </span>可以看出，实际上我们不需要去另行处理脚本文件名，即这</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>里完全可以复制<span
|
||
lang=EN-US>argc</span>个参数，包括原来执行文件名（即现在的脚本文件名）。因为它位于同</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>一个位置上<span lang=EN-US>
|
||
]]</span>。注意！这里指针<span lang=EN-US>p</span>随着复制信息增加而逐渐向小地址方向移动，因此这两个</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>复制串函数执行完后，环境参数串信息块位于程序命令行参数串信息块的上方，并且
|
||
<span lang=EN-US>p</span>指向</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>程序的第<span lang=EN-US>1</span>个参数串。<span
|
||
lang=EN-US>copy_strings()</span>最后一个参数（<span lang=EN-US>0</span>）指明参数字符串在用户空间。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>286</span></u><span
|
||
lang=EN-US>
|
||
if (sh_bang++ == 0) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>287</span></u><span
|
||
lang=EN-US>
|
||
p = <u><span style='color:blue'>copy_strings</span></u>(envc, <u><span
|
||
style='color:blue'>envp</span></u>, page, p, 0);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>288</span></u><span
|
||
lang=EN-US>
|
||
p = <u><span style='color:blue'>copy_strings</span></u>(--argc, <u><span
|
||
style='color:blue'>argv</span></u>+1, page, p, 0);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>289</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>290</span></u><span
|
||
lang=EN-US>
|
||
<b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>291</span></u><span
|
||
lang=EN-US> <b><i> *
|
||
Splice in (1) the interpreter's name for argv[0]</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>292</span></u><span
|
||
lang=EN-US> <b><i> *
|
||
(2) (optional) argument to interpreter</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>293</span></u><span
|
||
lang=EN-US> <b><i> *
|
||
(3) filename of shell script</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>294</span></u><span
|
||
lang=EN-US> <b><i> *</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>295</span></u><span
|
||
lang=EN-US> <b><i> *
|
||
This is done in reverse order, because of how the</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>296</span></u><span
|
||
lang=EN-US> <b><i> *
|
||
user environment and arguments are stored.</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>297</span></u><span
|
||
lang=EN-US> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
/*</span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* </span>拼接<span lang=EN-US> (1) argv[0]</span>中放解释程序的名称</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* (2) (</span>可选的<span lang=EN-US>)</span>解释程序的参数</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* (3) </span>脚本程序的名称</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
*</span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* </span>这是以逆序进行处理的，是由于用户环境和参数的存放方式造成的。</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
*/</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>接着我们逆向复制脚本文件名、解释程序的参数和解释程序文件名到参数和环境空间中。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>若出错，则置出错码，跳转到<span
|
||
lang=EN-US>exec_error1</span>。另外，由于本函数参数提供的脚本文件名</p>
|
||
|
||
<p class=a><span lang=EN-US> // filename</span>在用户空间，但这里赋予<span
|
||
lang=EN-US>copy_strings()</span>的脚本文件名的指针在内核空间，因</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>此这个复制字符串函数的最后一个参数（字符串来源标志）需要被设置成<span
|
||
lang=EN-US>1</span>。若字符串在</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>内核空间，则<span
|
||
lang=EN-US>copy_strings()</span>的最后一个参数要设置成<span lang=EN-US>2</span>，如下面的第<span
|
||
lang=EN-US>301</span>、<span lang=EN-US>304</span>行。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>298</span></u><span
|
||
lang=EN-US>
|
||
p = <u><span style='color:blue'>copy_strings</span></u>(1, &filename, page,
|
||
p, 1);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>299</span></u><span
|
||
lang=EN-US> argc++;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>300</span></u><span
|
||
lang=EN-US>
|
||
if (i_arg) {
|
||
// </span>复制解释程序的多个参数。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>301</span></u><span
|
||
lang=EN-US>
|
||
p = <u><span style='color:blue'>copy_strings</span></u>(1, &i_arg, page, p,
|
||
2);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>302</span></u><span
|
||
lang=EN-US>
|
||
argc++;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>303</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>304</span></u><span
|
||
lang=EN-US>
|
||
p = <u><span style='color:blue'>copy_strings</span></u>(1, &i_name, page,
|
||
p, 2);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>305</span></u><span
|
||
lang=EN-US>
|
||
argc++;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>306</span></u><span
|
||
lang=EN-US>
|
||
if (!p) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>307</span></u><span
|
||
lang=EN-US>
|
||
retval = -<u><span style='color:blue'>ENOMEM</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>308</span></u><span
|
||
lang=EN-US>
|
||
goto exec_error1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>309</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>310</span></u><span
|
||
lang=EN-US>
|
||
<b><i>/*</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>311</span></u><span
|
||
lang=EN-US> <b><i> *
|
||
OK, now restart the process with the interpreter's inode.</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>312</span></u><span
|
||
lang=EN-US> <b><i> */</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
/*</span></p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
* OK</span>，现在使用解释程序的<span lang=EN-US>i</span>节点重启进程。</p>
|
||
|
||
<p class=a><span lang=EN-US>
|
||
*/</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>最后我们取得解释程序的<span
|
||
lang=EN-US>i</span>节点指针，然后跳转到<span lang=EN-US>204</span>行去执行解释程序。为了获得解释程</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>序的<span lang=EN-US>i</span>节点，我们需要使用<span
|
||
lang=EN-US>namei()</span>函数，但是该函数所使用的参数（文件名）是从用户数</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>据空间得到的，即从段寄存器<span
|
||
lang=EN-US>fs</span>所指空间中取得。因此在调用<span lang=EN-US>namei()</span>函数之前我们需要</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>先临时让<span lang=EN-US>fs</span>指向内核数据空间，以让函数能从内核空间得到解释程序名，并在<span
|
||
lang=EN-US>namei()</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>返回后恢复<span lang=EN-US>fs</span>的默认设置。因此这里我们先临时保存原<span
|
||
lang=EN-US>fs</span>段寄存器（原指向用户数据段）</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>的值，将其设置成指向内核数据段，然后取解释程序的<span
|
||
lang=EN-US>i</span>节点。之后再恢复<span lang=EN-US>fs</span>的原值。并</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>跳转到<span lang=EN-US>restart_interp</span>（<span
|
||
lang=EN-US>204</span>行）处重新处理新的执行文件<span lang=EN-US> -- </span>脚本文件的解释程序。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>313</span></u><span
|
||
lang=EN-US>
|
||
old_fs = <u><span style='color:blue'>get_fs</span></u>();</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>314</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>set_fs</span></u>(<u><span style='color:blue'>get_ds</span></u>());</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>315</span></u><span
|
||
lang=EN-US>
|
||
if (!(inode=<u><span style='color:blue'>namei</span></u>(interp))) {
|
||
<b><i>/* get executables inode */</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>316</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>set_fs</span></u>(old_fs);
|
||
/* </span>取得解释程序的<span lang=EN-US>i</span>节点<span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>317</span></u><span
|
||
lang=EN-US>
|
||
retval = -<u><span style='color:blue'>ENOENT</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>318</span></u><span
|
||
lang=EN-US>
|
||
goto exec_error1;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>319</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>320</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>set_fs</span></u>(old_fs);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>321</span></u><span
|
||
lang=EN-US>
|
||
goto restart_interp;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>322</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>此时缓冲块中的执行文件头结构数据已经复制到了<span
|
||
lang=EN-US>ex </span>中。 于是先释放该缓冲块，并开始对</p>
|
||
|
||
<p class=a><span lang=EN-US> // ex</span>中的执行头信息进行判断处理。对于<span
|
||
lang=EN-US>Linux 0.12</span>内核来说，它仅支持<span lang=EN-US>ZMAGIC</span>执行文件格</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>式，并且执行文件代码都从逻辑地址<span
|
||
lang=EN-US>0 </span>开始执行，因此不支持含有代码或数据重定位信息的</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>执行文件。当然，如果执行文件实在太大或者执行文件残缺不全，那么我们也不能运行它。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>因此对于下列情况将不执行程序：如果执行文件不是需求页可执行文件（<span
|
||
lang=EN-US>ZMAGIC</span>）、或者代</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>码和数据重定位部分长度不等于<span
|
||
lang=EN-US>0</span>、或者<span lang=EN-US>(</span>代码段<span lang=EN-US>+</span>数据段<span
|
||
lang=EN-US>+</span>堆<span lang=EN-US>) </span>长度超过<span lang=EN-US>50MB</span>、或者执行文件</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>长度小于<span lang=EN-US>
|
||
(</span>代码段<span lang=EN-US>+</span>数据段<span lang=EN-US>+</span>符号表长度<span
|
||
lang=EN-US>+</span>执行头部分<span lang=EN-US>) </span>长度的总和。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>323</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>brelse</span></u>(bh);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>324</span></u><span
|
||
lang=EN-US> if (<u><span
|
||
style='color:blue'>N_MAGIC</span></u>(ex) != <u><span style='color:blue'>ZMAGIC</span></u>
|
||
|| ex.a_trsize || ex.a_drsize ||</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>325</span></u><span
|
||
lang=EN-US>
|
||
ex.a_text+ex.a_data+ex.a_bss>0x3000000 ||</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>326</span></u><span
|
||
lang=EN-US> inode->i_size
|
||
< ex.a_text+ex.a_data+ex.a_syms+<u><span style='color:blue'>N_TXTOFF</span></u>(ex))
|
||
{</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>327</span></u><span
|
||
lang=EN-US>
|
||
retval = -<u><span style='color:blue'>ENOEXEC</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>328</span></u><span
|
||
lang=EN-US>
|
||
goto exec_error2;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>329</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>另外，如果执行文件中代码开始处没有位于<span
|
||
lang=EN-US>1</span>个页面（<span lang=EN-US>1024</span>字节）边界处，则也不能执行。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>因为需求页（<span
|
||
lang=EN-US>Demand paging</span>）技术要求加载执行文件内容时以页面为单位，因此要求执行</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>文件映像中代码和数据都从页面边界处开始。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>330</span></u><span
|
||
lang=EN-US> if (<u><span
|
||
style='color:blue'>N_TXTOFF</span></u>(ex) != <u><span style='color:blue'>BLOCK_SIZE</span></u>)
|
||
{</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>331</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>printk</span></u>(<i>"%s: N_TXTOFF !=
|
||
BLOCK_SIZE. See a.out.h."</i>, filename);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>332</span></u><span
|
||
lang=EN-US>
|
||
retval = -<u><span style='color:blue'>ENOEXEC</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>333</span></u><span
|
||
lang=EN-US>
|
||
goto exec_error2;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>334</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果<span lang=EN-US>sh_bang</span>标志没有设置，则复制指定个数的命令行参数和环境字符串到参数和环境空间</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>中。若<span lang=EN-US>sh_bang</span>标志已经设置，则表明是将运行脚本解释程序，此时环境变量页面已经复制，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>无须再复制。同样，若<span
|
||
lang=EN-US>sh_bang</span>没有置位而需要复制的话，那么此时指针<span lang=EN-US>p</span>随着复制信息增</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>加而逐渐向小地址方向移动，因此这两个复制串函数执行完后，环境参数串信息块位于程序</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>参数串信息块的上方，并且<span
|
||
lang=EN-US>p</span>指向程序的第<span lang=EN-US>1</span>个参数串。事实上，<span lang=EN-US>p</span>是<span
|
||
lang=EN-US>128KB</span>参数和环境空</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>间中的偏移值。因此如果<span
|
||
lang=EN-US>p=0</span>，则表示环境变量与参数空间页面已经被占满，容纳不下了。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>335</span></u><span
|
||
lang=EN-US> if (!sh_bang) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>336</span></u><span
|
||
lang=EN-US>
|
||
p = <u><span style='color:blue'>copy_strings</span></u>(envc,<u><span
|
||
style='color:blue'>envp</span></u>,page,p,0);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>337</span></u><span
|
||
lang=EN-US>
|
||
p = <u><span style='color:blue'>copy_strings</span></u>(argc,<u><span
|
||
style='color:blue'>argv</span></u>,page,p,0);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>338</span></u><span
|
||
lang=EN-US>
|
||
if (!p) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>339</span></u><span
|
||
lang=EN-US>
|
||
retval = -<u><span
|
||
style='color:blue'>ENOMEM</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>340</span></u><span
|
||
lang=EN-US>
|
||
goto exec_error2;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>341</span></u><span
|
||
lang=EN-US>
|
||
}</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>342</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>343</span></u><span
|
||
lang=EN-US> <b><i>/* OK, This is the point of no return */</i></b></span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>344</span></u><span
|
||
lang=EN-US> <b><i>/* note that current->library stays unchanged by an exec
|
||
*/</i></b></span></p>
|
||
|
||
<p class=a><span lang=EN-US> /* OK</span>，下面开始就没有返回的地方了<span
|
||
lang=EN-US> */</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>前面我们针对函数参数提供的信息对需要运行执行文件的命令行参数和环境空间进行了设置，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>但还没有为执行文件做过什么实质性的工作，即还没有做过为执行文件初始化进程任务结构</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>信息、建立页表等工作。现在我们就来做这些工作。由于执行文件直接使用当前进程的“躯</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>壳”，即当前进程将被改造成执行文件的进程，因此我们需要首先释放当前进程占用的某些</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>系统资源，包括关闭指定的已打开文件、占用的页表和内存页面等。然后根据执行文件头结</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>构信息修改当前进程使用的局部描述符表<span
|
||
lang=EN-US>LDT</span>中描述符的内容，重新设置代码段和数据段描</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>述符的限长，再利用前面处理得到的<span
|
||
lang=EN-US>e_uid</span>和<span lang=EN-US>e_gid</span>等信息来设置进程任务结构中相关的字</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>段。最后把执行本次系统调用程序的返回地址 <span
|
||
lang=EN-US>eip[]</span>指向执行文件中代码的起始位置处。这</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>样当本系统调用退出返回后就会去运行新执行文件的代码了。注意，虽然此时新执行文件代</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>码和数据还没有从文件中加载到内存中，但其参数和环境块已经在<span
|
||
lang=EN-US>copy_strings() </span>中使用</p>
|
||
|
||
<p class=a><span lang=EN-US> // get_free_page()</span>分配了物理内存页来保存数据，并在<span
|
||
lang=EN-US>change_ldt()</span>函数中使用<span lang=EN-US>put_page()</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>到了进程逻辑空间的末端处。另外，在<span
|
||
lang=EN-US>create_tables()</span>中也会由于在用户栈上存放参数</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>和环境指针表而引起缺页异常，从而内存管理程序也会就此为用户栈空间映射物理内存页。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>这里我们首先放回进程原执行程序的<span
|
||
lang=EN-US>i</span>节点，并且让进程<span lang=EN-US>executable </span>字段指向新执行文件</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>的<span lang=EN-US>i</span>节点。然后复位原进程的所有信号处理句柄，但对于<span
|
||
lang=EN-US>SIG_IGN</span>句柄无须复位。再根据设</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>定的执行时关闭文件句柄（<span
|
||
lang=EN-US>close_on_exec</span>）位图标志，关闭指定的打开文件并复位该标志。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>345</span></u><span
|
||
lang=EN-US> if (<u><span
|
||
style='color:blue'>current</span></u>->executable)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>346</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>iput</span></u>(<u><span style='color:blue'>current</span></u>->executable);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>347</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>current</span></u>->executable = inode;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>348</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>current</span></u>->signal = 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>349</span></u><span
|
||
lang=EN-US> for (i=0 ; i<32
|
||
; i++) {</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>350</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>current</span></u>-><u><span style='color:blue'>sigaction</span></u>[i].sa_mask
|
||
= 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>351</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>current</span></u>-><u><span style='color:blue'>sigaction</span></u>[i].sa_flags
|
||
= 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>352</span></u><span
|
||
lang=EN-US>
|
||
if (<u><span style='color:blue'>current</span></u>-><u><span
|
||
style='color:blue'>sigaction</span></u>[i].sa_handler != <u><span
|
||
style='color:blue'>SIG_IGN</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>353</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>current</span></u>-><u><span style='color:blue'>sigaction</span></u>[i].sa_handler
|
||
= <u><span style='color:blue'>NULL</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>354</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>355</span></u><span
|
||
lang=EN-US> for (i=0 ; i<<u><span
|
||
style='color:blue'>NR_OPEN</span></u> ; i++)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>356</span></u><span
|
||
lang=EN-US>
|
||
if ((<u><span style='color:blue'>current</span></u>->close_on_exec>>i)&1)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>357</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>sys_close</span></u>(i);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>358</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>current</span></u>->close_on_exec = 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后根据当前进程指定的基地址和限长，释放原来程序的代码段和数据段所对应的内存页表</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>指定的物理内存页面及页表本身。此时新执行文件并没有占用主内存区任何页面，因此在处</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>理器真正运行新执行文件代码时就会引起缺页异常中断，此时内存管理程序即会执行缺页处</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>理而为新执行文件申请内存页面和设置相关页表项，并且把相关执行文件页面读入内存中。</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>如果“上次任务使用了协处理器”指向的是当前进程，则将其置空，并复位使用了协处理器</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>的标志。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>359</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>free_page_tables</span></u>(<u><span style='color:blue'>get_base</span></u>(<u><span
|
||
style='color:blue'>current</span></u>->ldt[1]),<u><span style='color:blue'>get_limit</span></u>(0x0f));</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>360</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>free_page_tables</span></u>(<u><span style='color:blue'>get_base</span></u>(<u><span
|
||
style='color:blue'>current</span></u>->ldt[2]),<u><span style='color:blue'>get_limit</span></u>(0x17));</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>361</span></u><span
|
||
lang=EN-US> if (<u><span
|
||
style='color:blue'>last_task_used_math</span></u> == <u><span style='color:
|
||
blue'>current</span></u>)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>362</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>last_task_used_math</span></u> = <u><span
|
||
style='color:blue'>NULL</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>363</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>current</span></u>->used_math = 0;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>然后我们根据新执行文件头结构中的代码长度字段<span
|
||
lang=EN-US> a_text </span>的值修改局部表中描述符基址和</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>段限长，并将<span
|
||
lang=EN-US>128KB </span>的参数和环境空间页面放置在数据段末端。执行下面语句之后，<span lang=EN-US>p</span>此时</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>更改成以数据段起始处为原点的偏移值，但仍指向参数和环境空间数据开始处，即已转换成</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>为栈指针值。然后调用内部函数<span
|
||
lang=EN-US>create_tables() </span>在栈空间中创建环境和参数变量指针表，</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>供程序的<span lang=EN-US>main()</span>作为参数使用，并返回该栈指针。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>364</span></u><span
|
||
lang=EN-US> p += <u><span
|
||
style='color:blue'>change_ldt</span></u>(ex.a_text,page);</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>365</span></u><span
|
||
lang=EN-US> p -= <u><span
|
||
style='color:blue'>LIBRARY_SIZE</span></u> + <u><span style='color:blue'>MAX_ARG_PAGES</span></u>*<u><span
|
||
style='color:blue'>PAGE_SIZE</span></u>;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>366</span></u><span
|
||
lang=EN-US> p = (unsigned long)
|
||
<u><span style='color:blue'>create_tables</span></u>((char *)p,argc,envc);</span></p>
|
||
|
||
<p class=a><span lang=EN-US> </span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>接着再修改进程各字段值为新执行文件的信息。即令进程任务结构代码尾字段<span
|
||
lang=EN-US>end_code</span>等</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>于执行文件的代码段长度 <span
|
||
lang=EN-US>a_text</span>；数据尾字段 <span lang=EN-US>end_data </span>等于执行文件的代码段长度加数</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>据段长度（<span lang=EN-US>a_data
|
||
+ a_text</span>）；并令进程堆结尾字段<span lang=EN-US>brk = a_text + a_data + a_bss</span>。</p>
|
||
|
||
<p class=a><span lang=EN-US> // brk</span>用于指明进程当前数据段（包括未初始化数据部分）末端位置，供内核为进程分配内存</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>时指定分配开始位置。然后设置进程栈开始字段为栈指针所在页面，并重新设置进程的有效</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>用户<span lang=EN-US>id</span>和有效组<span
|
||
lang=EN-US>id</span>。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>367</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>current</span></u>-><u><span style='color:blue'>brk</span></u>
|
||
= ex.a_bss +</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>368</span></u><span
|
||
lang=EN-US>
|
||
(<u><span style='color:blue'>current</span></u>->end_data = ex.a_data +</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>369</span></u><span
|
||
lang=EN-US>
|
||
(<u><span style='color:blue'>current</span></u>->end_code =
|
||
ex.a_text));</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>370</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>current</span></u>->start_stack = p & 0xfffff000;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>371</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>current</span></u>->suid = <u><span style='color:blue'>current</span></u>->euid
|
||
= e_uid;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>372</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>current</span></u>->sgid = <u><span style='color:blue'>current</span></u>->egid
|
||
= e_gid;</span></p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>最后将原调用系统中断的程序在堆栈上的代码指针替换为指向新执行程序的入口点，并将栈</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>指针替换为新执行文件的栈指针。此后返回指令将弹出这些栈数据并使得<span
|
||
lang=EN-US>CPU</span>去执行新执行</p>
|
||
|
||
<p class=a><span lang=EN-US> // </span>文件，因此不会返回到原调用系统中断的程序中去了。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>373</span></u><span
|
||
lang=EN-US> eip[0] =
|
||
ex.a_entry; <b><i>/* eip, magic happens :-) */</i></b>
|
||
/* eip</span>，魔法起作用了<span lang=EN-US>*/</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>374</span></u><span
|
||
lang=EN-US> eip[3] =
|
||
p; <b><i>/*
|
||
stack pointer */</i></b> /*
|
||
esp</span>，堆栈指针<span lang=EN-US> */</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>375</span></u><span
|
||
lang=EN-US> return 0;</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>376</span></u><span
|
||
lang=EN-US> exec_error2:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>377</span></u><span
|
||
lang=EN-US> <u><span
|
||
style='color:blue'>iput</span></u>(inode);
|
||
// </span>放回<span lang=EN-US>i</span>节点。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>378</span></u><span
|
||
lang=EN-US> exec_error1:</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>379</span></u><span
|
||
lang=EN-US> for (i=0 ; i<<u><span
|
||
style='color:blue'>MAX_ARG_PAGES</span></u> ; i++)</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>380</span></u><span
|
||
lang=EN-US>
|
||
<u><span style='color:blue'>free_page</span></u>(page[i]);
|
||
// </span>释放存放参数和环境串的内存页面。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>381</span></u><span
|
||
lang=EN-US> return(retval);
|
||
// </span>返回出错码。</p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>382</span></u><span
|
||
lang=EN-US> }</span></p>
|
||
|
||
<p class=a><u><span lang=EN-US style='color:blue'>383</span></u><span
|
||
lang=EN-US> </span></p>
|
||
|
||
<div class=a align=center style='text-align:center'><span lang=EN-US>
|
||
|
||
<hr size=4 width="100%" align=center>
|
||
|
||
</span></div>
|
||
|
||
<p class=MsoNormal><span lang=EN-US> </span></p>
|
||
|
||
</div>
|
||
|
||
</body>
|
||
|
||
</html>
|