linux-kernel - Re: Linux 5.8-rc1

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Message-ID: <20200616222819.GA1977632@rani.riverdale.lan>
Date:   Tue, 16 Jun 2020 18:28:19 -0400
From:   Arvind Sankar <nivedita@...m.mit.edu>
To:     Gabriel C <nix.or.die@...glemail.com>
Cc:     Arvind Sankar <nivedita@...m.mit.edu>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Hans de Goede <hdegoede@...hat.com>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: Linux 5.8-rc1

On Wed, Jun 17, 2020 at 12:00:14AM +0200, Gabriel C wrote:
> Am Di., 16. Juni 2020 um 23:25 Uhr schrieb Arvind Sankar
> <nivedita@...m.mit.edu>:
> >
> > On Tue, Jun 16, 2020 at 11:17:08PM +0200, Gabriel C wrote:
> > > Am Di., 16. Juni 2020 um 22:33 Uhr schrieb Arvind Sankar
> > > <nivedita@...m.mit.edu>:
> > > >
> > > > Can you attach the output of gcc -dumpspecs and gcc -v? I suspect your
> > > > compiler enables stack protector by default. My distro compiler does
> > > > that too, but not if -ffreestanding is enabled (which it is for the
> > > > purgatory).
> > > >
> > >
> > > Files including config uploaded to there:
> > >
> > > http://crazy.dev.frugalware.org/kernel/
> > >
> >
> > Yeah, your gcc doesn't have the -ffreestanding handling. Mine (from
> > gentoo) has this in the -dumpspecs output:
> >
> > *cc1_options:
> > ... %{nostdlib|nodefaultlibs|ffreestanding:-fno-stack-protector} ...
> >
> > to switch off the default ssp when the standard libraries aren't available.
> 
> I wondered what they enable to do that. it turns out it is a custom patch.
> While I think having that is not bad, such patches lead to bugs like this one.

Right. Debian also has a similar custom patch to adjust the specs. It
would probably be better if something were upstreamed :)