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open("printk_test.ko", O_RDONLY|O_LARGEFILE) = 3  // 打开二进制文件,文件描述符为3read(3, "\177E", 2)                     = 2  // 打开并读取两个字节, '\177' 'E'_llseek(3, -2, [0], SEEK_CUR)           = 0 // 回到第一个字节.fstat64(3, {
   st_mode=S_IFREG|0664, st_size=34324, ...}) = 0 // 获取保护模式,字节数read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\1\0(\0\1\0\0\0\0\0\0\0\0\0\0\0"..., 34816) = 34324 // 读取所有的字节read(3, "", 492)                        = 0 // 在读一次,直到0close(3)                                = 0 //关闭init_module(0x132088, 34324, """\001" "0" level 0! // load a kernel module 地址为 0x132088 ,长度为 34324 , 参数为空 "",从 "\001" 就是打印 // man 2 init_moduleKERN_EMERG level 0!pr_emerg level 0!"\001" "6" level 6!KERN_INFO level 6!pr_info level 6!"\001" "7" level 7!KERN_DEBUG level 7!"\001" "d" level default!KERN_DEFAULT level d!KERN_DEFAULT level d!printk contpr_cont cont)        = 0exit_group(0)                           = ?+++ exited with 0 +++

# insmod printk_test.ko "\001" "0" level 0!KERN_EMERG level 0!pr_emerg level 0!"\001" "6" level 6!KERN_INFO level 6!pr_info level 6!"\001" "7" level 7!KERN_DEBUG level 7!"\001" "d" level default!KERN_DEFAULT level d!KERN_DEFAULT level d!printk contpr_cont cont

CPU: 0 PID: 711 Comm: insmod Tainted: G           O    4.0.0+ #34Hardware name: ARM-Versatile Express[<80016db0>] (unwind_backtrace) from [<80012cd8>] (show_stack+0x20/0x24)[<80012cd8>] (show_stack) from [<80544e20>] (dump_stack+0x80/0x90)[<80544e20>] (dump_stack) from [<7f004018>] (hello_init+0x18/0xbc [printk_test])[<7f004018>] (hello_init [printk_test]) from [<80008acc>] (do_one_initcall+0x9c/0x1e4)[<80008acc>] (do_one_initcall) from [<80542f68>] (do_init_module+0x70/0x1bc)[<80542f68>] (do_init_module) from [<8008df80>] (load_module+0x1850/0x1ed8)[<8008df80>] (load_module) from [<8008e730>] (SyS_init_module+0x128/0x138)[<8008e730>] (SyS_init_module) from [<8000ec80>] (ret_fast_syscall+0x0/0x34)kernel/module.c	SYSCALL_DEFINE3(init_module, void __user *, umod,unsigned long, len, const char __user *, uargs)		load_module(&info, uargs, 0);			do_init_module(mod);				do_one_initcall(mod->init);					fn();

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