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From: Arvind Sankar <nivedita@alum.mit.edu>
To: Gabriel C <nix.or.die@googlemail.com>
Cc: Arvind Sankar <nivedita@alum.mit.edu>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Hans de Goede <hdegoede@redhat.com>,
	Borislav Petkov <bp@alien8.de>
Subject: Re: Linux 5.8-rc1
Date: Tue, 16 Jun 2020 18:28:19 -0400
Message-ID: <20200616222819.GA1977632@rani.riverdale.lan> (raw)
In-Reply-To: <CAEJqkgij-_Z1S-F=ooHr=OYcE8biHr1Z-RGgOzHpC7Y0wm7BhA@mail.gmail.com>

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@alum.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@alum.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 :)

  reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-14 20:44 Linus Torvalds
2020-06-15  1:59 ` linux-next: stats (Was: Linux 5.8-rc1) Stephen Rothwell
2020-06-16 20:11 ` Linux 5.8-rc1 Gabriel C
2020-06-16 20:33   ` Arvind Sankar
2020-06-16 21:17     ` Gabriel C
2020-06-16 21:25       ` Arvind Sankar
2020-06-16 22:00         ` Gabriel C
2020-06-16 22:28           ` Arvind Sankar [this message]
2020-06-16 21:35       ` Gabriel C
2020-06-16 22:25         ` [PATCH] x86/purgatory: Add -fno-stack-protector Arvind Sankar
2020-06-17  0:06           ` Linus Torvalds
2020-06-16 20:37   ` Linux 5.8-rc1 Borislav Petkov
2020-06-16 21:19     ` Gabriel C

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