linux-kernel - Re: [PATCH] lkdtm: add test for executing .rodata

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Message-ID: <2960615.8VnZpuvqp9@wuerfel>
Date:	Wed, 17 Feb 2016 22:45:49 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Kees Cook <keescook@...omium.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Laura Abbott <laura@...bott.name>,
	Mark Rutland <mark.rutland@....com>,
	Jeremy Linton <jeremy.linton@....com>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	kernel-hardening@...ts.openwall.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] lkdtm: add test for executing .rodata

On Wednesday 17 February 2016 22:44:12 Arnd Bergmann wrote:
> On Tuesday 16 February 2016 13:49:04 Kees Cook wrote:
> >  }
> >  
> > +static void __attribute__((__section__(".rodata,\"a\",@progbits#")))
> > +do_nothing_rodata(void)
> > +{
> > +       return;
> > +}
> > +
> >  static void do_nothing(void)
> >  {
> > 
> 
> I think this also needs to be marked "noinline" to ensure that the
> function does not get eliminated. I've seen clang do that on
> execute_location() recently and submitted a patch for that.

Nevermind, this gets passed by reference into execute_location(),
so it's enough if that is marked noinline, but do_nothing_rodata
needs no such annotation.

	Arnd