linux-kernel - Re: [PATCH v3] kbuild: Strip runtime const RELA sections correctly

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Message-ID: <CAMj1kXHeSnGcWRs1=kvJrqrUxgfsFDKPTAqQne6Le7pmComtYA@mail.gmail.com>
Date: Fri, 31 Jan 2025 20:02:06 +0100
From: Ard Biesheuvel <ardb@...nel.org>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: Ard Biesheuvel <ardb+git@...gle.com>, linux-kbuild@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Linus Torvalds <torvalds@...ux-foundation.org>, 
	linux-riscv@...ts.infradead.org, linux-s390@...r.kernel.org, 
	Ron Economos <re@...z.net>
Subject: Re: [PATCH v3] kbuild: Strip runtime const RELA sections correctly

On Fri, 31 Jan 2025 at 19:58, Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> On Sat, Feb 1, 2025 at 3:40 AM Ard Biesheuvel <ardb@...nel.org> wrote:
> >
> > On Fri, 31 Jan 2025 at 19:35, Masahiro Yamada <masahiroy@...nel.org> wrote:
> > >
> > > On Tue, Jan 14, 2025 at 12:53 AM Ard Biesheuvel <ardb+git@...gle.com> wrote:
> > > >
> > > > From: Ard Biesheuvel <ardb@...nel.org>
> > > >
> > > > Due to the fact that runtime const ELF sections are named without a
> > > > leading period or double underscore, the RSTRIP logic that removes the
> > > > static RELA sections from vmlinux fails to identify them.
> > >
> > >
> > > Dumb question - why can't you rename the section 'runtime*' to '.runtime*' ?
> > >
> > > .rel* matches to sections that just happen to start with '.rel',
> > > which may not be REL or RELA.
> > >
> >
> > That is what I proposed originally [0] but it was shot down by Linus.
> >
> > [0] https://lore.kernel.org/all/20241014125703.2287936-4-ardb+git@google.com/T/#u
>
>
> Does this work ?
>
> $(OBJCOPY) --remove-relocations='*' $@
>

Only with binutils, not with llvm-objcopy