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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 20:26:41 +0300
Message-ID: <CAHj3AV=v9ub2BYDZE_q3u9YEWbCLJaSNTVUC+z-nOVw-XQUziQ@mail.gmail.com> (raw)
In-Reply-To: <CAHhAz+hVweYwjxFuwMw2Hsb74trWiwacH3Qdk=5c78e01==drw@mail.gmail.com>

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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


> Any help is appreciated.
>
>
> --
> 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"><div dir="ltr"><div dir="ltr"><div dir="ltr">

<p style="margin:0px"><font color="#000000" face="Calibri" size="3">Hi All,</font></p><p style="margin:0px"><font color="#b00000" face="Calibri" size="3"><br></font></p><p style="margin:0px"><font color="#000000" face="Calibri" size="3">My Kernel is built with the following options:</font></p>

<p style="margin:0px"><font color="#000000" face="Calibri" size="3"> </font></p>

<p style="margin:0px"><font color="#000000" face="Calibri" size="3">CONFIG_CC_STACKPROTECTOR=y</font></p>

<p style="margin:0px"><font color="#000000" face="Calibri" size="3">CONFIG_CC_STACKPROTECTOR_<wbr>STRONG=y</font></p>

<p style="margin:0px"><font color="#000000" face="Calibri" size="3"> </font></p>

<p style="margin:0px"><font color="#000000" face="Calibri" size="3"> </font></p>

<p style="margin:0px"><font color="#000000" face="Calibri" size="3">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.</font></p>

<p style="margin:0px"><font color="#000000" face="Calibri" size="3"> </font></p>

<p style="margin:0px"><font color="#000000" face="Calibri" size="3">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:</font></p>

<p style="margin:0px"><font color="#000000" face="Calibri" size="3"> </font></p>

<p style="margin:0px"><font color="#000000" face="Calibri" size="3">Makefile:693: Cannot use CONFIG_CC_STACKPROTECTOR_<wbr>STRONG:
-fstack-protector-strong not supported by compiler</font></p>

<p style="margin:0px"><font color="#000000" face="Calibri" size="3"> </font></p>

<p style="margin:0px"><font color="#000000" face="Calibri" size="3">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? </font></p>

<p style="margin:0px"><font color="#000000" face="Calibri" size="3"> </font></p><font color="#b00000" face="Calibri" size="3"><p style="margin:0px"><font color="#000000">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?</font></p><p style="margin:0px">

</p></font><p style="margin:0px"><br></p></div></div></div></blockquote><div><br></div><div><br></div><div>Just disable it in your .config file</div><div> </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div dir="ltr"><div dir="ltr">

<p style="margin:0px"><font color="#000000" face="Calibri" size="3">Any help is appreciated.</font></p>

<font face="Calibri"></font><font size="3"></font><font color="#000000"></font><font face="Times New Roman"></font><br clear="all"><br>-- <br><div dir="ltr"><div>Thanks,</div><div>Sekhar</div></div></div></div></div>
</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 ` Denis Kirjanov [this message]
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       ` CONFIG_CC_STACKPROTECTOR_STRONG Muni Sekhar
2019-07-09 19:58 ` CONFIG_CC_STACKPROTECTOR_STRONG Greg KH

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