Modutils编译insmod指令

1.下载
官方下载地址
Modutils (2.4.27):

2.解压
tar -zxvf modutils-2.4.27.tar.gz

3.生成makefile
./configure

4.make
4.1 错误：
In file included from obj_kallsyms.c:26:
./../include/util.h:42: warning: built-in function ‘log’ declared as non-function
obj_kallsyms.c: In function ‘obj32_kallsyms’:
obj_kallsyms.c:204: error: lvalue required as left operand of assignment
obj_kallsyms.c:279: error: lvalue required as left operand of assignment
make[1]: *** [obj_kallsyms.o] 错误 1
make[1]: Leaving directory '/usr/src/redflag/BUILD/modutils-2.4.27/obj'
make: *** [all] 错误 2

修改：
（1）将obj_kallsyms.c文件修改如下
将204行的：
 a_hdr = (struct kallsyms_header *) osec->contents =xmalloc(osec->header.sh_size);
改成：
  osec->contents = xmalloc(osec->header.sh_size);
  a_hdr = (struct kallsyms_header *) osec->contents;

将279行的：
  a_hdr = (struct kallsyms_header *) osec->contents = xrealloc(a_hdr, a_hdr->total_size);
改成：
  osec->contents = xrealloc(a_hdr, a_hdr->total_size);
  a_hdr = (struct kallsyms_header *) osec->contents;

 
4.2 继续make，再错误
In file included from insmod.c:79:
./../include/util.h:42: warning: built-in function ‘log’ declared as non-function
insmod.c: In function ‘add_symbols_from’:
insmod.c:278: error: lvalue required as left operand of assignment
make[1]: *** [insmod.o] 错误 1
make[1]: Leaving directory ‘/usr/src/redflag/BUILD/modutils-2.4.27/insmod’
make: *** [all] 错误 2
error: Bad exit status from /var/tmp/rpm-tmp.36012 (%build)
 
修改：
将insmod.c文件的第278行
 ((char *)s->name) += 8;
改成
 s->name = (void *)((long)(s->name)+8);
再继续编译。

 

4.3 继续报错：
In file included from genksyms.c:32:
./../include/util.h:42: warning: built-in function ‘log’ declared as non-function
genksyms.c:48: error: static declaration of ‘errors’ follows non-static declaration
./../include/util.h:43: error: previous declaration of ‘errors’ was here
make[1]: *** [genksyms.o] 错误 1
make[1]: Leaving directory ‘/usr/src/redflag/BUILD/modutils-2.4.27/genksyms’
make: *** [all] 错误 2
error: Bad exit status from /var/tmp/rpm-tmp.97956 (%build)
 
修改：
将genksyms.c第48行的语句
 static int errors;
移到文件的开头，紧跟注释后的第一行去。

4.4 继续报错：
bison: Command not found
 
修改：
sudo apt-get install bison

4.5 继续编译，继续报错
flex:Command not found
修改：
sudo apt-get install flex

4.6 继续编译，继续报错
In file included from depmod.c:44:
./../include/util.h:42: warning: built-in function ‘log’ declared as non-function
depmod.c: In function ‘addksyms’:
depmod.c:1136: error: lvalue required as left operand of assignment
make[1]: *** [depmod.o] 错误 1
make[1]: Leaving directory ‘/usr/src/redflag/BUILD/modutils-2.4.27/depmod’
make: *** [all] 错误 2
error: Bad exit status from /var/tmp/rpm-tmp.36319 (%build)

修改：
将depmod.c的第1136行：
 ((char *)ksym->name) += 8;
改成：
 ksym->name = (void *)((long)(ksym->name)+8);

5. 终于编译成功，可以到insmod目录下，使用insmod指令加载模块了。注意编译出来的insmod指令只适合2.6 内核以前的版本。这个版本的modutils代码中的很多系统调用在现在的linux内核中已不存在。若想insmod指令能使用新版本的内核，需要下载最新的busybox源码去编译，编译出的insmod指令可以在新内核上使用。