内核是根据 linux-5.6.13 的源码自己编译的内核,虚拟机+Centos7 64 位

代码如下

#include <linux/init.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/unistd.h> #include <asm/uaccess.h> #include <linux/sched.h>  #define my_syscall_num 336 /*此处我也不知道为啥，执行 cat /proc/kallsyms | grep sys_call_table 结果如下 0000000000000000 R sys_call_table 0000000000000000 R ia32_sys_call_table */ #define sys_call_table_adress 0x00000000  unsigned int clear_and_return_cr0(void); void setback_cr0(unsigned int val); asmlinkage long sys_mycall(long long num); int orig_cr0; unsigned long *sys_call_table = 0; static int (*anything_saved)(void);  MODULE_AUTHOR("GuoShuSong"); MODULE_LICENSE("GPL"); unsigned int clear_and_return_cr0(void){  unsigned int cr0 = 0;  unsigned int ret;  asm("movl %%cr0,%%eax":"=a"(cr0));  ret = cr0;  cr0 &= 0xfffeffff;  asm("movl %%eax,%%cr0"::"a"(cr0));  return ret; } void setback_cr0(unsigned int val){  asm volatile("movl %%eax,%%cr0"::"a"(val)); }  static int __init init_addsyscall(void){  printk("hello,kernel");  sys_call_table=(unsigned long *)sys_call_table_adress;  anything_saved = (int(*)(void))(sys_call_table[my_syscall_num]);  orig_cr0 = clear_and_return_cr0();  sys_call_table[my_syscall_num]= (unsigned long)&sys_mycall;  setback_cr0(orig_cr0);  return 0; }  asmlinkage long sys_mycall(long long num){  int res =0;  long long r = num;  if(do_div(num,2)== 0){   res = do_div(r,1000000);  }else{   res = do_div(r,100000);  }  return res; }  static void __exit exit_addsyscall(void){  orig_cr0 = clear_and_return_cr0();  sys_call_table[my_syscall_num]= (unsigned long)anything_saved;  setback_cr0(orig_cr0);  printk("call exit n"); }  module_init(init_addsyscall); module_exit(exit_addsyscall); 

MakeFile 代码如下

ifneq  ($(KERNELRELEASE),) EXTRA_CFLAGS = -O0 obj-m := gss.o else KDIR = /lib/modules/$(shell uname -r)/build  #KDIR = /lib/modules/5.6.1318130500093-GuoShuSong/build  PWD := $(shell pwd) all:  make -C $(KDIR) M=$(PWD) modules clean:  rm -f *.ko *.o *.symvers *.cmd *.cmd.o endif 

执行 make 时报错如下

make -C /lib/modules/5.6.1318130500093-GuoShuSong/build M=/home/gssplus/桌面 /test/os3 modules make[1]: 进入目录“/home/gssplus/桌面 /test/linux-5.6.13”   CC [M]  /home/gssplus/桌面 /test/os3/gss.o In file included from /home/gssplus/桌面 /test/os3/gss.c:5:0: ./arch/x86/include/asm/uaccess.h: 在函数‘set_fs’中: ./arch/x86/include/asm/uaccess.h:31:9: 错误：提领指向不完全类型的指针   current->thread.addr_limit = fs;          ^ In file included from ./include/linux/init.h:5:0,                  from /home/gssplus/桌面 /test/os3/gss.c:1: ./arch/x86/include/asm/uaccess.h: 在函数‘user_access_begin’中: ./arch/x86/include/asm/uaccess.h:37:33: 错误：提领指向不完全类型的指针  #define user_addr_max() (current->thread.addr_limit.seg)                                  ^ ./include/linux/compiler.h:78:42: 附注：in definition of macro ‘unlikely’  # define unlikely(x) __builtin_expect(!!(x), 0)                                           ^ ./arch/x86/include/asm/uaccess.h:96:2: 附注：in expansion of macro ‘likely’   likely(!__range_not_ok(addr, size, user_addr_max()));     ^ ./arch/x86/include/asm/uaccess.h:96:10: 附注：in expansion of macro ‘__range_not_ok’   likely(!__range_not_ok(addr, size, user_addr_max()));             ^ ./arch/x86/include/asm/uaccess.h:96:37: 附注：in expansion of macro ‘user_addr_max’   likely(!__range_not_ok(addr, size, user_addr_max()));                                        ^ ./arch/x86/include/asm/uaccess.h:714:16: 附注：in expansion of macro ‘access_ok’   if (unlikely(!access_ok(ptr,len)))                 ^ make[3]: *** [/home/gssplus/桌面 /test/os3/gss.o] 错误 1 make[2]: *** [/home/gssplus/桌面 /test/os3] 错误 2 make[1]: *** [sub-make] 错误 2 make[1]: 离开目录“/home/gssplus/桌面 /test/linux-5.6.13” make: *** [all] 错误 2 

有没有大佬知道是怎么回事儿