编译内核模块后出错：sys/syscall.h：没有这样的文件或目录

Question

我正在执行一个内核模块，在插入后编辑whoami命令，我用Makefile编译它的内容如下：

obj-m+=holamundo.o 
obj-m+=acumulador.o 
obj-m+=cliente.o 
obj-m+=intercept.o 

all: 
    make -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules 
clean: 
    make -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean 

和我的模块代码：

#define MODULE 
#define __KERNEL__ 
#include <linux/module.h> 
#include <linux/kernel.h> 
#include </usr/src/kernels/linux/arch/x86/include/asm/unistd.h> 
#include <asm/unistd.h> 
#include <linux/unistd.h> 
#include <linux/syscalls.h> 
#include <sys/syscall.h> 
#include <asm/fcntl.h> 
#include <asm/errno.h> 
#include <linux/types.h> 
#include <linux/dirent.h> 
#include <linux/mman.h> 
#include <linux/string.h> 
#include <linux/fs.h> 

extern void *sys_call_table[]; 
int (*orig_geteuid)(const char *path); 

int hacked_geteuid(const char *path) { 
return 78; 
} 

int init_module(void) { 

orig_geteuid = sys_call_table[SYS_geteuid32]; 

sys_call_table[SYS_geteuid32] = hacked_geteuid; 
return 0; 

} 

void cleanup_module(void) { 
    sys_call_table[SYS_geteuid32] = orig_geteuid; 
} 

我现在面临的问题是，当我执行命令make我得到的错误：

/usr/src/kernels/intercept.c:9:25: fatal error: sys/syscall.h: No such file or directory 

我使用的是Linux内核4.12.10在RedHat 7.3

从代码中移除#include <sys/syscall.h>后，我得到以下错误：

/usr/src/kernels/intercept.c:27:31: error: ‘SYS_geteuid32’ undeclared (first use in this function) 
orig_geteuid = sys_call_table[SYS_geteuid32]; 
          ^
/usr/src/kernels/intercept.c:27:31: note: each undeclared identifier is reported only once for each function it appears in 
/usr/src/kernels/intercept.c: In function ‘cleanup_module’: 
/usr/src/kernels/intercept.c:35:17: error: ‘SYS_geteuid32’ undeclared (first use in this function) 
    sys_call_table[SYS_geteuid32] = orig_geteuid; 

有谁知道我做错了什么？

Answer 1

你正在寻找的常数是__NR_geteuid它定义在asm/unistd.h。