linux-kernel - Re: [tip: objtool/urgent] objtool: Fix seg fault with Clang non-section symbols

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Message-ID: <YCfdfkoeh8i0baCj@kroah.com>
Date:   Sat, 13 Feb 2021 15:09:02 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Xi Ruoyao <xry111@...gyan1223.wang>,
        "# 3.4.x" <stable@...r.kernel.org>,
        Arnd Bergmann <arnd@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Miroslav Benes <mbenes@...e.cz>,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-tip-commits@...r.kernel.org
Subject: Re: [tip: objtool/urgent] objtool: Fix seg fault with Clang
 non-section symbols

On Fri, Feb 12, 2021 at 12:45:47PM -0500, Steven Rostedt wrote:
> On Fri, 12 Feb 2021 11:07:50 -0600
> Josh Poimboeuf <jpoimboe@...hat.com> wrote:
> 
> 
> > > Any ideas are appreciated.  
> > 
> > [ Adding Steve Rostedt ]
> > 
> > This error message comes from recordmcount.  It probably can't handle
> > the missing STT_SECTION symbols which are getting stripped by the new
> > binutils.  (Objtool also had trouble with that.)
> > 
> > No idea why you only see this on 4.4 though.
> > 
> 
> Just taking a quick look, but would something like this work?
> 
> I created this against v4.4.257.
> 
> -- Steve
> 
> diff --git a/scripts/recordmcount.h b/scripts/recordmcount.h
> index 04151ede8043..698404f092d0 100644
> --- a/scripts/recordmcount.h
> +++ b/scripts/recordmcount.h
> @@ -437,6 +437,8 @@ static unsigned find_secsym_ndx(unsigned const txtndx,
>  			if (w2(ehdr->e_machine) == EM_ARM
>  			    && ELF_ST_TYPE(symp->st_info) == STT_FUNC)
>  				continue;
> +			if (ELF_ST_TYPE(symp->st_info) == STT_SECTION)
> +				continue;
>  
>  			*recvalp = _w(symp->st_value);
>  			return symp - sym0;
> 


Thanks for the patch, but no, still fails with:

Cannot find symbol for section 8: .text.unlikely.
kernel/kexec_file.o: failed
make[1]: *** [scripts/Makefile.build:277: kernel/kexec_file.o] Error 1
make[1]: *** Deleting file 'kernel/kexec_file.o'