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From: Will Deacon <will.deacon@arm.com>
To: Nick Desaulniers <ndesaulniers@google.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	peter.smith@linaro.org,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>
Subject: Re: [RFT PATCH] arm64: add support for building the KASLR kernel with LLVM lld
Date: Mon, 3 Dec 2018 18:54:15 +0000	[thread overview]
Message-ID: <20181203185415.GA29028@arm.com> (raw)
In-Reply-To: <CAKwvOd=mDNKhWxS8RtX5oTh0fmorfTayiD3+dGyPU5NOcROSuA@mail.gmail.com>

On Mon, Dec 03, 2018 at 10:33:06AM -0800, Nick Desaulniers wrote:
> On Mon, Dec 3, 2018 at 8:58 AM Will Deacon <will.deacon@arm.com> wrote:
> >
> > On Sat, Dec 01, 2018 at 02:57:34PM +0100, Ard Biesheuvel wrote:
> > > Work around some differences in the behavior of ld.lld as compared
> > > to lb.bfd:
> > > - pass the -z notext and -z norelro options to convince the linker to
> > >   permit text relocations, and relro sections that are non-adjacent
> > >   (both of which are irrelevant for bare metal executables such as the
> > >   kernel)
> > > - move the definition of some __efistub_ decorated section markers to
> > >   the linker script, which permits us to assign them as relative
> > >   quantities (since using an intermediate assignment loses the section
> > >   relative property when using ld.lld)
> >
> > I'd prefer not to work around a linker bug in today's lld just for KASLR
> > if it's anything more than passing a funny set of linker options.
> 
> Filed https://bugs.llvm.org/show_bug.cgi?id=39857 to follow up. Peter
> has narrowed down a straightforward reproducer.

Thank you.

Will

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      reply	other threads:[~2018-12-03 18:54 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-12-01 13:57 [RFT PATCH] arm64: add support for building the KASLR kernel with LLVM lld Ard Biesheuvel
2018-12-01 23:11 ` Nick Desaulniers
2018-12-03 16:58 ` Will Deacon
2018-12-03 18:33   ` Nick Desaulniers
2018-12-03 18:54     ` Will Deacon [this message]

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