LKML Archive on lore.kernel.org
 help / color / Atom feed
From: Sedat Dilek <sedat.dilek@gmail.com>
To: Kees Cook <keescook@chromium.org>
Cc: Borislav Petkov <bp@suse.de>, "H.J. Lu" <hjl.tools@gmail.com>,
	Russell King <linux@armlinux.org.uk>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Peter Collingbourne <pcc@google.com>,
	James Morse <james.morse@arm.com>, Arnd Bergmann <arnd@arndb.de>,
	Masahiro Yamada <masahiroy@kernel.org>,
	x86@kernel.org, linux-arm-kernel@lists.infradead.org,
	linux-arch@vger.kernel.org, linux-kbuild@vger.kernel.org,
	Clang-Built-Linux ML <clang-built-linux@googlegroups.com>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/9] Enable orphan section warning
Date: Thu, 2 Apr 2020 18:20:57 +0200
Message-ID: <CA+icZUWTnP8DYfbaMwKtJbG30v7bB4w6=ywo8gn8fvwr731mUQ@mail.gmail.com> (raw)
In-Reply-To: <20200228002244.15240-1-keescook@chromium.org>

On Fri, Feb 28, 2020 at 1:22 AM Kees Cook <keescook@chromium.org> wrote:
>
> Hi!
>
> A recent bug was solved for builds linked with ld.lld, and tracking
> it down took way longer than it needed to (a year). Ultimately, it
> boiled down to differences between ld.bfd and ld.lld's handling of
> orphan sections. Similarly, the recent FGKASLR series brough up orphan
> section handling too[2]. In both cases, it would have been nice if the
> linker was running with --orphan-handling=warn so that surprise sections
> wouldn't silently get mapped into the kernel image at locations up to
> the whim of the linker's orphan handling logic. Instead, all desired
> sections should be explicitly identified in the linker script (to be
> either kept or discarded) with any orphans throwing a warning. The
> powerpc architecture actually already does this, so this series seeks
> to extend this coverage to x86, arm64, and arm.
>
> This series depends on tip/x86/boot (where recent .eh_frame fixes[3]
> landed), and has a minor conflict[4] with the ARM tree (related to
> the earlier mentioned bug). As it uses refactorings in the asm-generic
> linker script, and makes changes to kbuild, I think the cleanest place
> for this series to land would also be through -tip. Once again (like
> my READ_IMPLIES_EXEC series), I'm looking to get maintainer Acks so
> this can go all together with the least disruption. Splitting it up by
> architecture seems needlessly difficult.
>
> Thanks!
>

Hi Kees,

what is the status of this patchset?
Looks like it is not in tip or linux-next Git.

Thanks.

Regards,
- Sedat -

> -Kees
>
> [1] https://github.com/ClangBuiltLinux/linux/issues/282
> [2] https://lore.kernel.org/lkml/202002242122.AA4D1B8@keescook/
> [3] https://lore.kernel.org/lkml/158264960194.28353.10560165361470246192.tip-bot2@tip-bot2/
> [4] https://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=8959/1
>
> H.J. Lu (1):
>   Add RUNTIME_DISCARD_EXIT to generic DISCARDS
>
> Kees Cook (8):
>   scripts/link-vmlinux.sh: Delay orphan handling warnings until final
>     link
>   vmlinux.lds.h: Add .gnu.version* to DISCARDS
>   x86/build: Warn on orphan section placement
>   x86/boot: Warn on orphan section placement
>   arm64/build: Use common DISCARDS in linker script
>   arm64/build: Warn on orphan section placement
>   arm/build: Warn on orphan section placement
>   arm/boot: Warn on orphan section placement
>
>  arch/arm/Makefile                             |  4 ++++
>  arch/arm/boot/compressed/Makefile             |  2 ++
>  arch/arm/boot/compressed/vmlinux.lds.S        | 17 ++++++--------
>  .../arm/{kernel => include/asm}/vmlinux.lds.h | 22 ++++++++++++++-----
>  arch/arm/kernel/vmlinux-xip.lds.S             |  5 ++---
>  arch/arm/kernel/vmlinux.lds.S                 |  5 ++---
>  arch/arm64/Makefile                           |  4 ++++
>  arch/arm64/kernel/vmlinux.lds.S               | 13 +++++------
>  arch/x86/Makefile                             |  4 ++++
>  arch/x86/boot/compressed/Makefile             |  3 ++-
>  arch/x86/boot/compressed/vmlinux.lds.S        | 13 +++++++++++
>  arch/x86/kernel/vmlinux.lds.S                 |  7 ++++++
>  include/asm-generic/vmlinux.lds.h             | 11 ++++++++--
>  scripts/link-vmlinux.sh                       |  6 +++++
>  14 files changed, 85 insertions(+), 31 deletions(-)
>  rename arch/arm/{kernel => include/asm}/vmlinux.lds.h (92%)
>
> --
> 2.20.1
>
> --
> You received this message because you are subscribed to the Google Groups "Clang Built Linux" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to clang-built-linux+unsubscribe@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/clang-built-linux/20200228002244.15240-1-keescook%40chromium.org.

  parent reply index

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-28  0:22 Kees Cook
2020-02-28  0:22 ` [PATCH 1/9] scripts/link-vmlinux.sh: Delay orphan handling warnings until final link Kees Cook
2020-03-20  2:47   ` Nicholas Piggin
2020-03-20 18:24     ` Kees Cook
2020-03-22  9:16       ` Nicholas Piggin
2020-03-22 16:00         ` Kees Cook
2020-02-28  0:22 ` [PATCH 2/9] vmlinux.lds.h: Add .gnu.version* to DISCARDS Kees Cook
2020-02-28  0:22 ` [PATCH 3/9] x86/build: Warn on orphan section placement Kees Cook
2020-02-28  0:22 ` [PATCH 4/9] x86/boot: " Kees Cook
2020-02-28  0:22 ` [PATCH 5/9] Add RUNTIME_DISCARD_EXIT to generic DISCARDS Kees Cook
2020-02-28  0:22 ` [PATCH 6/9] arm64/build: Use common DISCARDS in linker script Kees Cook
2020-03-17 21:52   ` Will Deacon
2020-02-28  0:22 ` [PATCH 7/9] arm64/build: Warn on orphan section placement Kees Cook
2020-03-17 21:56   ` Will Deacon
2020-03-17 23:01     ` Kees Cook
2020-03-17 23:10       ` Nick Desaulniers
2020-02-28  0:22 ` [PATCH 8/9] arm/build: " Kees Cook
2020-02-28  0:22 ` [PATCH 9/9] arm/boot: " Kees Cook
2020-02-28  6:51 ` [PATCH 0/9] Enable orphan section warning Sedat Dilek
2020-03-03  4:32   ` Kees Cook
2020-04-02 16:20 ` Sedat Dilek [this message]
2020-04-02 17:26   ` Kees Cook
2020-04-05 11:15     ` Sedat Dilek

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='CA+icZUWTnP8DYfbaMwKtJbG30v7bB4w6=ywo8gn8fvwr731mUQ@mail.gmail.com' \
    --to=sedat.dilek@gmail.com \
    --cc=arnd@arndb.de \
    --cc=bp@suse.de \
    --cc=catalin.marinas@arm.com \
    --cc=clang-built-linux@googlegroups.com \
    --cc=hjl.tools@gmail.com \
    --cc=james.morse@arm.com \
    --cc=keescook@chromium.org \
    --cc=linux-arch@vger.kernel.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kbuild@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux@armlinux.org.uk \
    --cc=mark.rutland@arm.com \
    --cc=masahiroy@kernel.org \
    --cc=pcc@google.com \
    --cc=will@kernel.org \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

LKML Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git
	git clone --mirror https://lore.kernel.org/lkml/8 lkml/git/8.git
	git clone --mirror https://lore.kernel.org/lkml/9 lkml/git/9.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git