CONFIG_CC_STACKPROTECTOR_STRONG

[Muni Sekhar]

On Tue, 9 Jul, 2019, 11:16 PM Denis Kirjanov, <kirjanov at gmail.com> wrote:

>
>
> On Tuesday, July 9, 2019, Muni Sekhar <munisekharrms at gmail.com> wrote:
>
>> On Tue, Jul 9, 2019 at 10:56 PM Denis Kirjanov <kirjanov at gmail.com>
>> wrote:
>> >
>> >
>> >
>> > On Tuesday, July 9, 2019, Muni Sekhar <munisekharrms at gmail.com> wrote:
>> >>
>> >> Hi All,
>> >>
>> >>
>> >> My Kernel is built with the following options:
>> >>
>> >>
>> >>
>> >> CONFIG_CC_STACKPROTECTOR=y
>> >>
>> >> CONFIG_CC_STACKPROTECTOR_STRONG=y
>> >>
>> >>
>> >>
>> >>
>> >>
>> >> We use out-of-tree kernel modules in our project and I need to measure
>> the performance of it by using a bit older gcc version 4.8.5.
>> >>
>> >>
>> >>
>> >> I can build the modules with gcc above 5 version, but when I try to
>> use gcc version 4.8.5 I’m getting the following error:
>> >>
>> >>
>> >>
>> >> Makefile:693: Cannot use CONFIG_CC_STACKPROTECTOR_STRONG:
>> -fstack-protector-strong not supported by compiler
>> >>
>> >>
>> >>
>> >> So it looks like gcc 4.8.5 does not support
>> CONFIG_CC_STACKPROTECTOR_STRONG option, but how to instruct gcc to ignore
>> this one?
>> >>
>> >>
>> >>
>> >> In runtime, is it possible to instruct kernel to ignore
>> “CONFIG_CC_STACKPROTECTOR_STRONG=y” (without building the kernel) by using
>> sysctl or any other method?
>> >>
>> >>
>> >
>> >
>> > Just disable it in your .config file
>>
>> I disabled in /lib/modules/$(uname -r)/build/.config, but still get
>> that error. Does kernel needs to be recompiled?
>>
>> CONFIG_CC_STACKPROTECTOR=y
>> # CONFIG_CC_STACKPROTECTOR_NONE is not set
>> # CONFIG_CC_STACKPROTECTOR_REGULAR is not set
>> # CONFIG_CC_STACKPROTECTOR_STRONG is not set
>>
>>
> You have to disable it in your kernel source directory
> and then run ‘make oldconfig’
>
I got this error while building out of tree module in Ubuntu system. I'm
directly using the Ubuntu distribution kernel , so where should I suppose
to run the 'make old config'? Because I didn't have the kernel source code.

> >
>> >
>> >>
>> >> Any help is appreciated.
>> >>
>> >>
>> >>
>> >> --
>> >> Thanks,
>> >> Sekhar
>> >
>> >
>> >
>> > --
>> > Regards / Mit besten Grüßen,
>> > Denis
>> >
>>
>>
>> --
>> Thanks,
>> Sekhar
>>
>
>
> --
> Regards / Mit besten Grüßen,
> Denis
>
>
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