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so i'm getting this error : "module verification failed: signature and/or required key missing - tainting kernel" when i'm trying to put my simple device driver to kernel. I tried recompiling kernel, change my makefile , but nothing helped. At this moment my makefile : 

obj-m := DeviceD.o

KERNEL_DIR = /usr/src/linux-headers-$(shell uname -r)

all:
    $(MAKE) -C $(KERNEL_DIR) SUBDIRS=$(PWD) modules

clean:
     rm -rf *.o *.ko *.mod.* *.symvers *.order *~

also tried this makefile : 

obj-m += DeviceD.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
Rimwis
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    possible duplicate of [kvm: module verification failed: signature and/or required key missing - tainting kernel](http://stackoverflow.com/questions/24975377/kvm-module-verification-failed-signature-and-or-required-key-missing-taintin) – Patrick B. Dec 07 '14 at 21:46

1 Answers1

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That means you have not used GPL in the module description macros. This is a warning to indicate you are using some non open software kernel module.

To cease to obtain that message, you have to change the parameter of MODULE_LICENSE() macro in your drive code to include the GPL string.

Luis Colorado
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