linux-kernel - Re: [PATCH v5 06/16] x86/relocs: Handle R_X86_64_REX

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Message-ID: <CAMzpN2i6MM27Pb+82rPN8FuBn4B7HZOZdaPdP2eNRS9FJZ-GGw@mail.gmail.com>
Date: Thu, 7 Nov 2024 06:27:06 -0500
From: Brian Gerst <brgerst@...il.com>
To: Uros Bizjak <ubizjak@...il.com>
Cc: linux-kernel@...r.kernel.org, x86@...nel.org, 
	Ingo Molnar <mingo@...nel.org>, "H . Peter Anvin" <hpa@...or.com>, Thomas Gleixner <tglx@...utronix.de>, 
	Borislav Petkov <bp@...en8.de>, Ard Biesheuvel <ardb@...nel.org>
Subject: Re: [PATCH v5 06/16] x86/relocs: Handle R_X86_64_REX_GOTPCRELX relocations

On Thu, Nov 7, 2024 at 6:20 AM Uros Bizjak <ubizjak@...il.com> wrote:
>
> On Tue, Nov 5, 2024 at 4:58 PM Brian Gerst <brgerst@...il.com> wrote:
> >
> > Clang may produce R_X86_64_REX_GOTPCRELX relocations when redefining the
> > stack protector location.  Treat them as another type of PC-relative
> > relocation.
> >
> > Signed-off-by: Brian Gerst <brgerst@...il.com>
> > ---
> >  arch/x86/tools/relocs.c | 7 +++++++
> >  1 file changed, 7 insertions(+)
> >
> > diff --git a/arch/x86/tools/relocs.c b/arch/x86/tools/relocs.c
> > index 6afe2e5e9102..7d7fc7f0a250 100644
> > --- a/arch/x86/tools/relocs.c
> > +++ b/arch/x86/tools/relocs.c
> > @@ -32,6 +32,11 @@ static struct relocs         relocs32;
> >  static struct relocs           relocs32neg;
> >  static struct relocs           relocs64;
> >  # define FMT PRIu64
> > +
> > +#ifndef R_X86_64_REX_GOTPCRELX
> > +#define R_X86_64_REX_GOTPCRELX 42
> > +#endif
>
> The next patch (7/16) introduces the above definition to
> arch/x86/include/asm/elf.h. If you swap patches 6 and 7 in the series,
> you won't have to introduce the above conditional definition.
>
> Uros.

This is a userspace tool, so it's using the build host libc headers.

--
Brian Gerst