转自:http://blog.chinaunix.net/uid-26847859-id-3297170.html
原文地址:编译驱动模块时,出现“stack protector enabled but no compiler support”[解决办法] 作者:cjunsking
写驱动程序,编译驱动模块时,出现
“make[1]: Entering directory `/usr/src/linux-headers-2.6.32-5-amd64'
/usr/src/linux-headers-2.6.32-5-common/arch/x86/Makefile:81: stack protector enabled but no compiler support” - stack protector启用,但编译器不支持
解决方法1: (除去栈保护支持)
1. 修改 /usr/src/linux-header-xxx/目录下的文件.config,找到CONFIG_CC_STACKPROTECTOR,注释掉
2. 同样的办法修改/usr/src/linux-header-xxx/include/config/auto.conf
解决方法2: (保留栈保护功能)
在/usr/src/linux-headers-2.6.32-5-common/arch/x86/Makefile中有
- ifdef CONFIG_CC_STACKPROTECTOR
- cc_has_sp := $(srctree)/scripts/gcc-x86_$(BITS)-has-stack-protector.sh
- ifeq ($(shell $(CONFIG_SHELL) $(cc_has_sp) $(CC) $(biarch)),y)
- stackp-y := -fstack-protector
- KBUILD_CFLAGS += $(stackp-y)
- else
- $(warning stack protector enabled but no compiler support)
- endif
- endif
判断编译器是否支持stack-protector的是/usr/src/linux-headers-2.6.32-5-common/scripts/gcc-x86_$(BITS)-has-stack-protector.sh文件(针对32/64位机器,有不同的文件)
点击(此处)折叠或打开
- #!/bin/sh
- echo "" | $* -S -xc -c -O0 -fstack-protector - -o - 2> /dev/null | grep -q "%gs"
- if [ "$?" -eq "0" ] ; then
- echo y
- else
- echo n
- fi
这个文件中判断gcc是否支持fstack-protector的方法是,查看""生成的支持栈保护的汇编码中是否含有"%gs"。大家可以通过实验来观察区别,而这个文件中的判断与实际的相反。故将这两个文件中的y和n互换位置即可。
实验: Debian6.0.5/Linux 2.6.32-5-amd64/gcc 4.4.5
源代码: (test_stack_protector.c)
int foo(void) { char X[200]; return 3; }
编译结果:
(1) gcc -S -fstack-protector -o stack test_stack_protector.c
stack:
------------------------------------------------------------
- .file"test_stack_protector.c"
- .text
- .globl foo
- .typefoo, @function
- foo:
- pushl %ebp
- movl %esp, %ebp
- subl $216, %esp
- movl %gs:20, %eax
- movl %eax, -12(%ebp)
- xorl %eax, %eax
- movl $3, %eax
- movl -12(%ebp), %edx
- xorl %gs:20, %edx
- je .L3
- call __stack_chk_fail
- .L3:
- leave
- ret
- .sizefoo, .-foo
- .ident"GCC: (Debian 4.4.5-8) 4.4.5"
- .section.note.GNU-stack,"",@progbits
(2) gcc -S -fno-stack-protector -o nostack test_stack_protector.c
nostack:
------------------------------------------------------------
-
- .file"test_stack_protector.c"
- .text
- .globl foo
- .typefoo, @function
- foo:
- pushl %ebp
- movl %esp, %ebp
- subl $208, %esp
- movl $3, %eax
- leave
- ret
- .sizefoo, .-foo
- .ident"GCC: (Debian 4.4.5-8) 4.4.5"
- .section.note.GNU-stack,"",@progbits