linux-kernel - Re: [PATCH v6 00/29] Warn on orphan section placement

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Message-ID: <20200901081647.GB3602433@gmail.com>
Date:   Tue, 1 Sep 2020 10:16:47 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Kees Cook <keescook@...omium.org>
Cc:     Borislav Petkov <bp@...e.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Peter Collingbourne <pcc@...gle.com>,
        James Morse <james.morse@....com>,
        Ingo Molnar <mingo@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Arvind Sankar <nivedita@...m.mit.edu>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <natechancellor@...il.com>,
        Arnd Bergmann <arnd@...db.de>, x86@...nel.org,
        clang-built-linux@...glegroups.com, linux-arch@...r.kernel.org,
        linux-efi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 00/29] Warn on orphan section placement


* Ingo Molnar <mingo@...nel.org> wrote:

> 
> * Ingo Molnar <mingo@...nel.org> wrote:
> 
> > 
> > * Kees Cook <keescook@...omium.org> wrote:
> > 
> > > On Fri, Aug 21, 2020 at 12:42:41PM -0700, Kees Cook wrote:
> > > > Hi Ingo,
> > > > 
> > > > Based on my testing, this is ready to go. I've reviewed the feedback on
> > > > v5 and made a few small changes, noted below.
> > > 
> > > If no one objects, I'll pop this into my tree for -next. I'd prefer it
> > > go via -tip though! :)
> > > 
> > > Thanks!
> > 
> > I'll pick it up today, it all looks very good now!
> 
> One thing I found in testing is that it doesn't handler older LD 
> versions well enough:
> 
>   ld: unrecognized option '--orphan-handling=warn'
> 
> Could we just detect the availability of this flag, and emit a warning 
> if it doesn't exist but otherwise not abort the build?
> 
> This is with:
> 
>   GNU ld version 2.25-17.fc23

I've resolved this for now by not applying the 5 patches that add the 
actual orphan section warnings:

  arm64/build: Warn on orphan section placement
  arm/build: Warn on orphan section placement
  arm/boot: Warn on orphan section placement
  x86/build: Warn on orphan section placement
  x86/boot/compressed: Warn on orphan section placement

The new asserts plus the actual fixes/enhancements are enough changes 
to test for now in any case. :-)

Thanks,

	Ingo