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From: Denis Kirjanov <kirjanov@gmail.com>
To: Muni Sekhar <munisekharrms@gmail.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	kernelnewbies <kernelnewbies@kernelnewbies.org>
Subject: Re: CONFIG_CC_STACKPROTECTOR_STRONG
Date: Tue, 9 Jul 2019 20:46:17 +0300
Message-ID: <CAHj3AVmPkVuntnPjg5mseioBPT7KuBTT_HHmUsQyR04aANGz8w@mail.gmail.com> (raw)
In-Reply-To: <CAHhAz+gSnj8O+sM-939EqLvj_HL0BSQF4C452kn-GBxhyXODmw@mail.gmail.com>

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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’

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


-- 
Regards / Mit besten Grüßen,
Denis

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<br><br>On Tuesday, July 9, 2019, Muni Sekhar &lt;<a href="mailto:munisekharrms@gmail.com">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">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">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_<wbr>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_<wbr>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_<wbr>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_<wbr>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_<wbr>REGULAR is not set<br>
# CONFIG_CC_STACKPROTECTOR_<wbr>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 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>

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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     ` Denis Kirjanov [this message]
2019-07-09 18:04       ` CONFIG_CC_STACKPROTECTOR_STRONG Muni Sekhar
2019-07-09 19:58 ` CONFIG_CC_STACKPROTECTOR_STRONG Greg KH

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