From: Sedat Dilek <sedat.dilek@gmail.com>
To: Sami Tolvanen <samitolvanen@google.com>
Cc: linux-arch@vger.kernel.org, x86@kernel.org,
Kees Cook <keescook@chromium.org>,
"Paul E. McKenney" <paulmck@kernel.org>,
kernel-hardening@lists.openwall.com,
Peter Zijlstra <peterz@infradead.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Masahiro Yamada <masahiroy@kernel.org>,
linux-kbuild@vger.kernel.org,
Nick Desaulniers <ndesaulniers@google.com>,
linux-kernel@vger.kernel.org,
Steven Rostedt <rostedt@goodmis.org>,
Clang-Built-Linux ML <clang-built-linux@googlegroups.com>,
linux-pci@vger.kernel.org, Will Deacon <will@kernel.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 00/28] Add support for Clang LTO
Date: Fri, 4 Sep 2020 09:53:38 +0200 [thread overview]
Message-ID: <CA+icZUW_=L5n4gAPV_sL+TaLJ0SMZOWHSNOpWD9M3fSLDCv_kw@mail.gmail.com> (raw)
In-Reply-To: <20200903203053.3411268-1-samitolvanen@google.com>
On Thu, Sep 3, 2020 at 10:30 PM 'Sami Tolvanen' via Clang Built Linux
<clang-built-linux@googlegroups.com> wrote:
>
> This patch series adds support for building x86_64 and arm64 kernels
> with Clang's Link Time Optimization (LTO).
>
> In addition to performance, the primary motivation for LTO is
> to allow Clang's Control-Flow Integrity (CFI) to be used in the
> kernel. Google has shipped millions of Pixel devices running three
> major kernel versions with LTO+CFI since 2018.
>
> Most of the patches are build system changes for handling LLVM
> bitcode, which Clang produces with LTO instead of ELF object files,
> postponing ELF processing until a later stage, and ensuring initcall
> ordering.
>
> Note that patches 1-4 are not directly related to LTO, but are
> needed to compile LTO kernels with ToT Clang, so I'm including them
> in the series for your convenience:
>
> - Patches 1-3 are required for building the kernel with ToT Clang,
> and IAS, and patch 4 is needed to build allmodconfig with LTO.
>
> - Patches 3-4 are already in linux-next, but not yet in 5.9-rc.
>
I jumped to Sami's clang-cfi Git tree which includes clang-lto v2.
My LLVM toolchain is version 11.0.0.0-rc2+ more precisely git
97ac9e82002d6b12831ca2c78f739cca65a4fa05.
If this is OK, feel free to add my...
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
- Sedat -
[1] https://github.com/samitolvanen/linux/commits/clang-cfi
> ---
> Changes in v2:
>
> - Fixed -Wmissing-prototypes warnings with W=1.
>
> - Dropped cc-option from -fsplit-lto-unit and added .thinlto-cache
> scrubbing to make distclean.
>
> - Added a comment about Clang >=11 being required.
>
> - Added a patch to disable LTO for the arm64 KVM nVHE code.
>
> - Disabled objtool's noinstr validation with LTO unless enabled.
>
> - Included Peter's proposed objtool mcount patch in the series
> and replaced recordmcount with the objtool pass to avoid
> whitelisting relocations that are not calls.
>
> - Updated several commit messages with better explanations.
>
>
> Arvind Sankar (2):
> x86/boot/compressed: Disable relocation relaxation
> x86/asm: Replace __force_order with memory clobber
>
> Luca Stefani (1):
> RAS/CEC: Fix cec_init() prototype
>
> Nick Desaulniers (1):
> lib/string.c: implement stpcpy
>
> Peter Zijlstra (1):
> objtool: Add a pass for generating __mcount_loc
>
> Sami Tolvanen (23):
> objtool: Don't autodetect vmlinux.o
> kbuild: add support for objtool mcount
> x86, build: use objtool mcount
> kbuild: add support for Clang LTO
> kbuild: lto: fix module versioning
> kbuild: lto: postpone objtool
> kbuild: lto: limit inlining
> kbuild: lto: merge module sections
> kbuild: lto: remove duplicate dependencies from .mod files
> init: lto: ensure initcall ordering
> init: lto: fix PREL32 relocations
> PCI: Fix PREL32 relocations for LTO
> modpost: lto: strip .lto from module names
> scripts/mod: disable LTO for empty.c
> efi/libstub: disable LTO
> drivers/misc/lkdtm: disable LTO for rodata.o
> arm64: export CC_USING_PATCHABLE_FUNCTION_ENTRY
> arm64: vdso: disable LTO
> KVM: arm64: disable LTO for the nVHE directory
> arm64: allow LTO_CLANG and THINLTO to be selected
> x86, vdso: disable LTO only for vDSO
> x86, relocs: Ignore L4_PAGE_OFFSET relocations
> x86, build: allow LTO_CLANG and THINLTO to be selected
>
> .gitignore | 1 +
> Makefile | 65 ++++++-
> arch/Kconfig | 67 +++++++
> arch/arm64/Kconfig | 2 +
> arch/arm64/Makefile | 1 +
> arch/arm64/kernel/vdso/Makefile | 4 +-
> arch/arm64/kvm/hyp/nvhe/Makefile | 4 +-
> arch/x86/Kconfig | 3 +
> arch/x86/Makefile | 5 +
> arch/x86/boot/compressed/Makefile | 2 +
> arch/x86/boot/compressed/pgtable_64.c | 9 -
> arch/x86/entry/vdso/Makefile | 5 +-
> arch/x86/include/asm/special_insns.h | 28 +--
> arch/x86/kernel/cpu/common.c | 4 +-
> arch/x86/tools/relocs.c | 1 +
> drivers/firmware/efi/libstub/Makefile | 2 +
> drivers/misc/lkdtm/Makefile | 1 +
> drivers/ras/cec.c | 9 +-
> include/asm-generic/vmlinux.lds.h | 11 +-
> include/linux/init.h | 79 +++++++-
> include/linux/pci.h | 19 +-
> kernel/trace/Kconfig | 5 +
> lib/string.c | 24 +++
> scripts/Makefile.build | 55 +++++-
> scripts/Makefile.lib | 6 +-
> scripts/Makefile.modfinal | 31 ++-
> scripts/Makefile.modpost | 26 ++-
> scripts/generate_initcall_order.pl | 270 ++++++++++++++++++++++++++
> scripts/link-vmlinux.sh | 94 ++++++++-
> scripts/mod/Makefile | 1 +
> scripts/mod/modpost.c | 16 +-
> scripts/mod/modpost.h | 9 +
> scripts/mod/sumversion.c | 6 +-
> scripts/module-lto.lds | 26 +++
> tools/objtool/builtin-check.c | 13 +-
> tools/objtool/builtin.h | 2 +-
> tools/objtool/check.c | 83 ++++++++
> tools/objtool/check.h | 1 +
> tools/objtool/objtool.h | 1 +
> 39 files changed, 883 insertions(+), 108 deletions(-)
> create mode 100755 scripts/generate_initcall_order.pl
> create mode 100644 scripts/module-lto.lds
>
>
> base-commit: e28f0104343d0c132fa37f479870c9e43355fee4
> --
> 2.28.0.402.g5ffc5be6b7-goog
>
> --
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next prev parent reply other threads:[~2020-09-04 7:55 UTC|newest]
Thread overview: 212+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-24 20:31 [PATCH 00/22] add support for Clang LTO Sami Tolvanen
2020-06-24 20:31 ` [PATCH 01/22] objtool: use sh_info to find the base for .rela sections Sami Tolvanen
2020-06-24 20:31 ` [PATCH 02/22] kbuild: add support for Clang LTO Sami Tolvanen
2020-06-24 20:53 ` Nick Desaulniers
2020-06-24 21:29 ` Sami Tolvanen
2020-06-25 2:26 ` Nathan Chancellor
2020-06-25 16:13 ` Sami Tolvanen
2020-06-24 20:31 ` [PATCH 03/22] kbuild: lto: fix module versioning Sami Tolvanen
2020-06-24 20:31 ` [PATCH 04/22] kbuild: lto: fix recordmcount Sami Tolvanen
2020-06-24 21:27 ` Peter Zijlstra
2020-06-24 21:45 ` Sami Tolvanen
2020-06-25 7:45 ` Peter Zijlstra
2020-06-25 16:15 ` Sami Tolvanen
2020-06-25 20:02 ` [RFC][PATCH] objtool,x86_64: Replace recordmcount with objtool Peter Zijlstra
2020-06-25 20:54 ` Nick Desaulniers
2020-06-25 22:40 ` Sami Tolvanen
2020-06-26 11:29 ` Peter Zijlstra
2020-06-26 11:42 ` Peter Zijlstra
2020-07-17 17:28 ` Sami Tolvanen
2020-07-17 17:36 ` Steven Rostedt
2020-07-17 17:47 ` Sami Tolvanen
2020-07-17 18:05 ` Steven Rostedt
2020-07-20 16:52 ` Sami Tolvanen
2020-07-22 17:58 ` Steven Rostedt
2020-07-22 18:07 ` Sami Tolvanen
2020-07-22 17:55 ` Steven Rostedt
2020-07-22 18:41 ` Peter Zijlstra
2020-07-22 19:09 ` Steven Rostedt
2020-07-22 20:03 ` Sami Tolvanen
2020-07-22 23:56 ` Peter Zijlstra
2020-07-23 0:06 ` Steven Rostedt
2020-08-06 22:09 ` Sami Tolvanen
2020-06-24 20:31 ` [PATCH 05/22] kbuild: lto: postpone objtool Sami Tolvanen
2020-06-24 21:19 ` Peter Zijlstra
2020-06-24 21:49 ` Sami Tolvanen
2020-06-25 7:47 ` Peter Zijlstra
2020-06-25 16:22 ` Sami Tolvanen
2020-06-25 18:33 ` Peter Zijlstra
2020-06-25 19:32 ` Sami Tolvanen
2020-06-24 20:31 ` [PATCH 06/22] kbuild: lto: limit inlining Sami Tolvanen
2020-06-24 21:20 ` Peter Zijlstra
2020-06-24 23:37 ` Sami Tolvanen
2020-06-24 20:31 ` [PATCH 07/22] kbuild: lto: merge module sections Sami Tolvanen
2020-06-24 21:01 ` Nick Desaulniers
2020-06-24 21:31 ` Sami Tolvanen
2020-06-24 20:31 ` [PATCH 08/22] kbuild: lto: remove duplicate dependencies from .mod files Sami Tolvanen
2020-06-24 21:13 ` Nick Desaulniers
2020-06-24 20:31 ` [PATCH 09/22] init: lto: ensure initcall ordering Sami Tolvanen
2020-06-25 0:58 ` kernel test robot
2020-06-25 4:19 ` kernel test robot
2020-06-24 20:31 ` [PATCH 10/22] init: lto: fix PREL32 relocations Sami Tolvanen
2020-06-24 20:31 ` [PATCH 11/22] pci: " Sami Tolvanen
2020-06-24 22:49 ` kernel test robot
2020-06-24 23:03 ` Nick Desaulniers
2020-06-24 23:21 ` Sami Tolvanen
2020-07-17 20:26 ` Bjorn Helgaas
2020-07-22 18:15 ` Sami Tolvanen
2020-06-24 20:31 ` [PATCH 12/22] modpost: lto: strip .lto from module names Sami Tolvanen
2020-06-24 22:05 ` Nick Desaulniers
2020-06-24 20:31 ` [PATCH 13/22] scripts/mod: disable LTO for empty.c Sami Tolvanen
2020-06-24 20:57 ` Nick Desaulniers
2020-06-24 20:31 ` [PATCH 14/22] efi/libstub: disable LTO Sami Tolvanen
2020-06-24 20:31 ` [PATCH 15/22] drivers/misc/lkdtm: disable LTO for rodata.o Sami Tolvanen
2020-06-24 20:31 ` [PATCH 16/22] arm64: export CC_USING_PATCHABLE_FUNCTION_ENTRY Sami Tolvanen
2020-06-24 20:31 ` [PATCH 17/22] arm64: vdso: disable LTO Sami Tolvanen
2020-06-24 20:58 ` Nick Desaulniers
2020-06-24 21:09 ` Nick Desaulniers
2020-06-24 23:51 ` Andi Kleen
2020-06-24 21:52 ` Sami Tolvanen
2020-06-24 23:05 ` Nick Desaulniers
2020-06-24 23:39 ` Sami Tolvanen
2020-06-24 20:31 ` [PATCH 18/22] arm64: allow LTO_CLANG and THINLTO to be selected Sami Tolvanen
2020-06-24 20:31 ` [PATCH 19/22] x86, vdso: disable LTO only for vDSO Sami Tolvanen
2020-06-24 20:31 ` [PATCH 20/22] x86, ftrace: disable recordmcount for ftrace_make_nop Sami Tolvanen
2020-06-24 20:31 ` [PATCH 21/22] x86, relocs: Ignore L4_PAGE_OFFSET relocations Sami Tolvanen
2020-06-24 20:32 ` [PATCH 22/22] x86, build: allow LTO_CLANG and THINLTO to be selected Sami Tolvanen
2020-06-24 21:15 ` [PATCH 00/22] add support for Clang LTO Peter Zijlstra
2020-06-24 21:30 ` Sami Tolvanen
2020-06-25 8:27 ` Will Deacon
2020-06-24 21:31 ` Nick Desaulniers
2020-06-25 8:03 ` Peter Zijlstra
2020-06-25 8:24 ` Peter Zijlstra
2020-06-25 8:57 ` Peter Zijlstra
2020-06-30 19:19 ` Marco Elver
2020-06-30 20:12 ` Peter Zijlstra
2020-06-30 20:30 ` Paul E. McKenney
2020-07-01 9:10 ` Peter Zijlstra
2020-07-01 14:20 ` David Laight
2020-07-01 16:06 ` Paul E. McKenney
2020-07-02 9:37 ` David Laight
2020-07-02 18:00 ` Paul E. McKenney
2020-07-01 9:41 ` Marco Elver
2020-07-01 10:03 ` Will Deacon
2020-07-01 11:40 ` Peter Zijlstra
2020-07-01 14:06 ` Paul E. McKenney
2020-07-01 15:05 ` Peter Zijlstra
2020-07-01 16:03 ` Paul E. McKenney
2020-07-02 8:20 ` Peter Zijlstra
2020-07-02 17:59 ` Paul E. McKenney
2020-07-03 13:13 ` Peter Zijlstra
2020-07-03 13:25 ` Peter Zijlstra
2020-07-03 14:51 ` Paul E. McKenney
2020-07-03 14:42 ` Paul E. McKenney
2020-07-06 16:26 ` Paul E. McKenney
2020-07-06 18:29 ` Peter Zijlstra
2020-07-06 18:39 ` Paul E. McKenney
2020-07-06 19:40 ` Peter Zijlstra
2020-07-06 23:41 ` Paul E. McKenney
2020-06-28 16:56 ` Masahiro Yamada
2020-06-29 23:20 ` Sami Tolvanen
2020-07-07 15:51 ` Sami Tolvanen
2020-07-07 16:05 ` Sami Tolvanen
2020-07-07 16:56 ` Jakub Kicinski
2020-07-07 17:17 ` Nick Desaulniers
2020-07-07 17:30 ` Jakub Kicinski
2020-07-11 16:32 ` Paul Menzel
2020-07-12 8:59 ` Sedat Dilek
2020-07-12 18:40 ` Nathan Chancellor
2020-07-14 9:44 ` Sedat Dilek
2020-07-14 17:54 ` Nick Desaulniers
2020-07-12 23:34 ` Sami Tolvanen
2020-07-14 12:16 ` Paul Menzel
2020-07-14 12:35 ` Sedat Dilek
2020-09-03 20:30 ` [PATCH v2 00/28] Add " Sami Tolvanen
2020-09-03 20:30 ` [PATCH v2 01/28] x86/boot/compressed: Disable relocation relaxation Sami Tolvanen
2020-09-03 21:44 ` Kees Cook
2020-09-03 23:42 ` Arvind Sankar
2020-09-04 7:14 ` Nathan Chancellor
2020-09-03 20:30 ` [PATCH v2 02/28] x86/asm: Replace __force_order with memory clobber Sami Tolvanen
2020-09-03 21:45 ` Kees Cook
2020-09-03 20:30 ` [PATCH v2 03/28] lib/string.c: implement stpcpy Sami Tolvanen
2020-09-03 21:47 ` Kees Cook
2020-09-03 20:30 ` [PATCH v2 04/28] RAS/CEC: Fix cec_init() prototype Sami Tolvanen
2020-09-03 21:50 ` Kees Cook
2020-09-03 20:30 ` [PATCH v2 05/28] objtool: Add a pass for generating __mcount_loc Sami Tolvanen
2020-09-03 21:51 ` Kees Cook
2020-09-03 22:03 ` Sami Tolvanen
2020-09-04 9:31 ` peterz
2020-09-10 18:29 ` Kees Cook
2020-09-03 20:30 ` [PATCH v2 06/28] objtool: Don't autodetect vmlinux.o Sami Tolvanen
2020-09-03 21:52 ` Kees Cook
2020-09-03 20:30 ` [PATCH v2 07/28] kbuild: add support for objtool mcount Sami Tolvanen
2020-09-03 21:56 ` Kees Cook
2020-09-03 20:30 ` [PATCH v2 08/28] x86, build: use " Sami Tolvanen
2020-09-03 21:58 ` Kees Cook
2020-09-03 22:11 ` Sami Tolvanen
2020-09-03 20:30 ` [PATCH v2 09/28] kbuild: add support for Clang LTO Sami Tolvanen
2020-09-03 22:08 ` Kees Cook
2020-09-08 17:02 ` Sami Tolvanen
2020-09-05 19:36 ` Masahiro Yamada
2020-09-08 17:10 ` Sami Tolvanen
2020-09-05 20:17 ` Masahiro Yamada
2020-09-08 17:14 ` Sami Tolvanen
2020-09-07 15:30 ` Masahiro Yamada
2020-09-08 17:30 ` Sami Tolvanen
2020-09-03 20:30 ` [PATCH v2 10/28] kbuild: lto: fix module versioning Sami Tolvanen
2020-09-03 22:11 ` Kees Cook
2020-09-08 18:23 ` Sami Tolvanen
2020-09-03 20:30 ` [PATCH v2 11/28] kbuild: lto: postpone objtool Sami Tolvanen
2020-09-03 22:19 ` Kees Cook
2020-09-08 20:56 ` Sami Tolvanen
2020-09-03 20:30 ` [PATCH v2 12/28] kbuild: lto: limit inlining Sami Tolvanen
2020-09-03 22:20 ` Kees Cook
2020-09-03 20:30 ` [PATCH v2 13/28] kbuild: lto: merge module sections Sami Tolvanen
2020-09-03 22:23 ` Kees Cook
2020-09-07 15:25 ` Masahiro Yamada
2020-09-08 21:07 ` Sami Tolvanen
2020-09-03 20:30 ` [PATCH v2 14/28] kbuild: lto: remove duplicate dependencies from .mod files Sami Tolvanen
2020-09-03 22:29 ` Kees Cook
2020-09-03 20:30 ` [PATCH v2 15/28] init: lto: ensure initcall ordering Sami Tolvanen
2020-09-03 22:40 ` Kees Cook
2020-09-08 21:16 ` Sami Tolvanen
2020-09-10 9:25 ` David Woodhouse
2020-09-10 15:07 ` Sami Tolvanen
2020-09-03 20:30 ` [PATCH v2 16/28] init: lto: fix PREL32 relocations Sami Tolvanen
2020-09-03 22:41 ` Kees Cook
2020-09-03 20:30 ` [PATCH v2 17/28] PCI: Fix PREL32 relocations for LTO Sami Tolvanen
2020-09-03 22:42 ` Kees Cook
2020-09-03 20:30 ` [PATCH v2 18/28] modpost: lto: strip .lto from module names Sami Tolvanen
2020-09-03 22:42 ` Kees Cook
2020-09-03 20:30 ` [PATCH v2 19/28] scripts/mod: disable LTO for empty.c Sami Tolvanen
2020-09-03 22:43 ` Kees Cook
2020-09-03 20:30 ` [PATCH v2 20/28] efi/libstub: disable LTO Sami Tolvanen
2020-09-03 22:43 ` Kees Cook
2020-09-03 20:30 ` [PATCH v2 21/28] drivers/misc/lkdtm: disable LTO for rodata.o Sami Tolvanen
2020-09-03 20:30 ` [PATCH v2 22/28] arm64: export CC_USING_PATCHABLE_FUNCTION_ENTRY Sami Tolvanen
2020-09-03 22:44 ` Kees Cook
2020-09-08 21:23 ` Sami Tolvanen
2020-09-03 20:30 ` [PATCH v2 23/28] arm64: vdso: disable LTO Sami Tolvanen
2020-09-03 22:45 ` Kees Cook
2020-09-03 20:30 ` [PATCH v2 24/28] KVM: arm64: disable LTO for the nVHE directory Sami Tolvanen
2020-09-03 22:45 ` Kees Cook
2020-09-03 20:30 ` [PATCH v2 25/28] arm64: allow LTO_CLANG and THINLTO to be selected Sami Tolvanen
2020-09-03 22:45 ` Kees Cook
2020-09-03 20:30 ` [PATCH v2 26/28] x86, vdso: disable LTO only for vDSO Sami Tolvanen
2020-09-03 22:46 ` Kees Cook
2020-09-03 20:30 ` [PATCH v2 27/28] x86, relocs: Ignore L4_PAGE_OFFSET relocations Sami Tolvanen
2020-09-03 22:47 ` Kees Cook
2020-09-08 23:28 ` Sami Tolvanen
2020-09-03 20:30 ` [PATCH v2 28/28] x86, build: allow LTO_CLANG and THINLTO to be selected Sami Tolvanen
2020-09-03 22:48 ` Kees Cook
2020-09-03 23:34 ` [PATCH v2 00/28] Add support for Clang LTO Kees Cook
2020-09-04 4:45 ` Nathan Chancellor
2020-09-03 23:38 ` Kees Cook
2020-09-04 7:53 ` Sedat Dilek [this message]
2020-09-04 8:55 ` peterz
2020-09-04 9:08 ` Sedat Dilek
2020-09-06 0:24 ` Masahiro Yamada
2020-09-08 23:46 ` Sami Tolvanen
2020-09-10 1:18 ` Masahiro Yamada
2020-09-10 15:17 ` Sami Tolvanen
2020-09-10 18:18 ` Kees Cook
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