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Date: Sun, 2 Jul 2006 01:06:35 +0200
From: Sam Ravnborg <sam@ravnborg.org>
To: Miles Lane <miles.lane@gmail.com>
Cc: Arjan van de Ven <arjan@infradead.org>, Andrew Morton <akpm@osdl.org>,
       LKML <linux-kernel@vger.kernel.org>, "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: 2.6.17-mm5 -- Busted toolchain? -- usr/klibc/exec_l.c:59: undefined reference to `__stack_chk_fail'
Message-ID: <20060701230635.GA19114@mars.ravnborg.org>
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 >> > > >
> >> > > >   KLIBCLD usr/klibc/libc.so
> >> > > > usr/klibc/execl.o: In function `execl':
...
 >
> >https://wiki.ubuntu.com/GccSsp
> >
> >It appears that Ubuntu's Edgy Eft (the development tree) now contains
> >"Stack Smashing Protection" enabled by default.  I found a web page
> >that states that -fno-stack-protector can be used to disable this
> >functionality.  Interestingly, another web page stated that SSP has
> >been enabled in Redhat compilers for a long time and is now also
> >enabled in Debian SID.  Perhaps -fno-stack-protector should be added
> >to the kernel build be default?
> 
> Darn it.  I don't seem to know how to get -fno-stack-protector to
> work.  I ran:
> export CFLAGS=-fno-stack-protector
> make mrproper
> cp ../.config .
> make oldconfig
> CFLAGS=-fno-stack-protector make all install modules modules_install
> 
> But I am still getting the errors.  Anyone know what I am doing wrong?

For klibc you need to patch scripts/Kbuild.klibc

Appending it to KLIBCWARNFLAGS seems the right place.

Do you know from what gcc version we can start using -fno-stack-protector?

	Sam