Linux内核模块编程-不能使用CONFIG_CC_STACKPROTECTOR_REGULAR：编译器不支持-fstack-protector

Question

I am on Linux Ubuntu 14.04. I want to start Linux Kernel Module Programming. I have hello.c (simple Hello World module) and Makefile. But, on "make" command, I get error.

I tried Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: -fstack-protector-strong not supported by compiler , but it did not work for me.

hello.c

/* hello.c − Illustrating the __init, __initdata and __exit macros. */

#include <linux/module.h>
/* Needed by all modules */
#include <linux/kernel.h>
/* Needed for KERN_INFO */
#include <linux/init.h>
/* Needed for the macros */

static int hello3_data __initdata = 3;

static int __init hello_3_init(void)
{
  printk(KERN_INFO "Hello, world %d\n", hello3_data);
  return 0;
}

static void __exit hello_3_exit(void)
{
  printk(KERN_INFO "Goodbye, world 3\n");
} 

module_init(hello_3_init);
module_exit(hello_3_exit);

Makefile

obj-m += hello.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

On "make" :-

k@k-Inspiron-3542:~/Kernel programs$ make
make -C /lib/modules/4.2.0-27-generic/build M=/home/k/Kernel programs modules
make[1]: Entering directory `/usr/src/linux-headers-4.2.0-27-generic'
arch/x86/Makefile:138: CONFIG_X86_X32 enabled but no binutils support
Makefile:662: Cannot use CONFIG_CC_STACKPROTECTOR_REGULAR: -fstack-protector not supported by compiler
make[1]: *** No rule to make target `programs'.  Stop.
make[1]: Leaving directory `/usr/src/linux-headers-4.2.0-27-generic'
make: *** [all] Error 2

Currently, my ubuntu has 4.2 kernel. I even tried this on 3.x kernel, but there was this same error.

Please help me in this. Thanks. :)

Answer 1

I had searched a lot before asking this question, but no solution worked for me. I continued my search and finally, this solution worked for me. https://askubuntu.com/questions/367838/compiling-error-while-installing-realtek-rtl8111e-in-64-bit-13-10-config-x86-x

Strangely, there should be no space(s) in the directory name in which kernel modules are there. So, I removed the space and it worked.

Hope it will help someone in future. :)

Answer 2

Your file works OK here. With your Makefile, and with the default Makefile:

obj-m   := hello.o

KDIR    := /lib/modules/$(shell uname -r)/build
PWD     := $(shell pwd)

default:
    $(MAKE) -C $(KDIR) SUBDIRS=$(PWD) modules

clean:
    $(MAKE) -C $(KDIR) M=$(PWD) clean

The files hello.ko, hello.mod.c, hello.mod.o, hello.o, modules.order, Module.symvers are created. May be install this: sudo apt install g++ binutils-dev

Answer 3

If you don't have spaces in your compile directory and you're still getting this error, your kernel compilation may be failing because its directory belongs to root and you're running as an unprivileged user. Try sudo make