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From: Muni Sekhar <munisekharrms@gmail.com>
To: Denis Kirjanov <kirjanov@gmail.com>
Cc: linux-kernel@vger.kernel.org,
	kernelnewbies <kernelnewbies@kernelnewbies.org>
Subject: Re: CONFIG_CC_STACKPROTECTOR_STRONG
Date: Tue, 9 Jul 2019 23:34:05 +0530
Message-ID: <CAHhAz+hJqCbZk0zajEbVMRv7gE=1HAeDh6EDMmoLN9isjdanLg@mail.gmail.com> (raw)
In-Reply-To: <CAHj3AVmPkVuntnPjg5mseioBPT7KuBTT_HHmUsQyR04aANGz8w@mail.gmail.com>

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

>
>
> On Tuesday, July 9, 2019, Muni Sekhar <munisekharrms@gmail.com> wrote:
>
>> On Tue, Jul 9, 2019 at 10:56 PM Denis Kirjanov <kirjanov@gmail.com>
>> wrote:
>> >
>> >
>> >
>> > On Tuesday, July 9, 2019, Muni Sekhar <munisekharrms@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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<div dir="auto"><div><br><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, 9 Jul, 2019, 11:16 PM Denis Kirjanov, &lt;<a href="mailto:kirjanov@gmail.com">kirjanov@gmail.com</a>&gt; wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br><br>On Tuesday, July 9, 2019, Muni Sekhar &lt;<a href="mailto:munisekharrms@gmail.com" target="_blank" rel="noreferrer">munisekharrms@gmail.com</a>&gt; wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Tue, Jul 9, 2019 at 10:56 PM Denis Kirjanov &lt;<a href="mailto:kirjanov@gmail.com" target="_blank" rel="noreferrer">kirjanov@gmail.com</a>&gt; wrote:<br>
&gt;<br>
&gt;<br>
&gt;<br>
&gt; On Tuesday, July 9, 2019, Muni Sekhar &lt;<a href="mailto:munisekharrms@gmail.com" target="_blank" rel="noreferrer">munisekharrms@gmail.com</a>&gt; wrote:<br>
&gt;&gt;<br>
&gt;&gt; Hi All,<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; My Kernel is built with the following options:<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; CONFIG_CC_STACKPROTECTOR=y<br>
&gt;&gt;<br>
&gt;&gt; CONFIG_CC_STACKPROTECTOR_STRONG=y<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; 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.<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; 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:<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; Makefile:693: Cannot use CONFIG_CC_STACKPROTECTOR_STRONG: -fstack-protector-strong not supported by compiler<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; 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?<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; 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?<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;<br>
&gt;<br>
&gt; Just disable it in your .config file<br>
<br>
I disabled in /lib/modules/$(uname -r)/build/.config, but still get<br>
that error. Does kernel needs to be recompiled?<br>
<br>
CONFIG_CC_STACKPROTECTOR=y<br>
# CONFIG_CC_STACKPROTECTOR_NONE is not set<br>
# CONFIG_CC_STACKPROTECTOR_REGULAR is not set<br>
# CONFIG_CC_STACKPROTECTOR_STRONG is not set<br>
<br></blockquote><div><br></div><div>You have to disable it in your kernel source directory </div><div>and then run ‘make oldconfig’ </div></blockquote></div></div><div dir="auto">I got this error while building out of tree module in Ubuntu system. I&#39;m directly using the Ubuntu distribution kernel , so where should I suppose to run the &#39;make old config&#39;? Because I didn&#39;t have the kernel source code.</div><div dir="auto"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
&gt;<br>
&gt;<br>
&gt;&gt;<br>
&gt;&gt; Any help is appreciated.<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt;<br>
&gt;&gt; --<br>
&gt;&gt; Thanks,<br>
&gt;&gt; Sekhar<br>
&gt;<br>
&gt;<br>
&gt;<br>
&gt; --<br>
&gt; Regards / Mit besten Grüßen,<br>
&gt; Denis<br>
&gt;<br>
<br>
<br>
-- <br>
Thanks,<br>
Sekhar<br>
</blockquote><br><br>-- <br>Regards / Mit besten Grüßen,<br>Denis<br><br>
</blockquote></div></div></div>

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Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-07-09 17:24 CONFIG_CC_STACKPROTECTOR_STRONG Muni Sekhar
2019-07-09 17:26 ` CONFIG_CC_STACKPROTECTOR_STRONG Denis Kirjanov
2019-07-09 17:32   ` CONFIG_CC_STACKPROTECTOR_STRONG Muni Sekhar
2019-07-09 17:46     ` CONFIG_CC_STACKPROTECTOR_STRONG Denis Kirjanov
2019-07-09 18:04       ` Muni Sekhar [this message]
2019-07-09 19:58 ` CONFIG_CC_STACKPROTECTOR_STRONG Greg KH

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