From: Kees Cook <keescook@chromium.org>
To: "Fāng-ruì Sòng" <maskray@google.com>
Cc: Borislav Petkov <bp@suse.de>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, X86 ML <x86@kernel.org>,
Arnd Bergmann <arnd@arndb.de>,
Nick Desaulniers <ndesaulniers@google.com>,
Nathan Chancellor <natechancellor@gmail.com>,
clang-built-linux <clang-built-linux@googlegroups.com>,
linux-arch@vger.kernel.org, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v2 1/3] vmlinux.lds.h: Add .gnu.version* to DISCARDS
Date: Mon, 22 Jun 2020 16:30:18 -0700 [thread overview]
Message-ID: <202006221629.5C8CF8AE2@keescook> (raw)
In-Reply-To: <CAFP8O3KdGc9TtziFX7UzmxA-=wfPzm5oi6NCEwRiyyrp+JD3Xg@mail.gmail.com>
On Mon, Jun 22, 2020 at 04:04:40PM -0700, Fāng-ruì Sòng wrote:
> On Mon, Jun 22, 2020 at 3:57 PM Kees Cook <keescook@chromium.org> wrote:
> >
> > On Mon, Jun 22, 2020 at 03:52:37PM -0700, Fangrui Song wrote:
> > > > And it's not in the output:
> > > >
> > > > $ readelf -Vs arch/x86/boot/compressed/vmlinux | grep version
> > > > No version information found in this file.
> > > >
> > > > So... for the kernel we need to silence it right now.
> > >
> > > Re-link with -M (or -Map file) to check where .gnu.version{,_d,_r} input
> > > sections come from?
> >
> > It's not reporting it correctly:
> >
> > .gnu.version_d 0x00000000008966b0 0x0
> > .gnu.version_d
> > 0x00000000008966b0 0x0 arch/x86/boot/compressed/kernel_info.o
> >
> > .gnu.version 0x00000000008966b0 0x0
> > .gnu.version 0x00000000008966b0 0x0 arch/x86/boot/compressed/kernel_info.o
> >
> > .gnu.version_r 0x00000000008966b0 0x0
> > .gnu.version_r
> > 0x00000000008966b0 0x0 arch/x86/boot/compressed/kernel_info.o
> >
> > it just reports whatever file is listed on the link command line first.
> >
> > > If it is a bug, we should probably figure out which version of binutils
> > > has fixed the bug.
> >
> > I see this with binutils 2.34...
> >
> > --
> > Kees Cook
>
> :( It deserves a binutils bug
> (https://sourceware.org/bugzilla/enter_bug.cgi?product=binutils ) and
> a comment..
https://sourceware.org/bugzilla/show_bug.cgi?id=26153
> With the description adjusted to say that this works around a bug
>
> Reviewed-by: Fangrui Song <maskray@google.com>
Adjusted, and thanks!
--
Kees Cook
next prev parent reply other threads:[~2020-06-22 23:30 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-22 20:53 [PATCH v2 0/3] x86: Warn on orphan section placement Kees Cook
2020-06-22 20:53 ` [PATCH v2 1/3] vmlinux.lds.h: Add .gnu.version* to DISCARDS Kees Cook
2020-06-22 22:00 ` Fangrui Song
2020-06-22 22:09 ` Kees Cook
2020-06-22 22:27 ` Kees Cook
2020-06-22 22:52 ` Fangrui Song
2020-06-22 22:57 ` Kees Cook
2020-06-22 23:04 ` Fāng-ruì Sòng
2020-06-22 23:30 ` Kees Cook [this message]
2020-06-22 20:53 ` [PATCH v2 2/3] x86/build: Warn on orphan section placement Kees Cook
2020-06-22 20:53 ` [PATCH v2 3/3] x86/boot: " Kees Cook
2020-06-22 22:06 ` Fangrui Song
2020-06-22 22:35 ` Kees Cook
2020-06-22 22:43 ` Kees Cook
2020-06-22 22:49 ` Fangrui Song
2020-06-22 23:00 ` Kees Cook
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