From: Mark Brown <broonie@kernel.org>
To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>
Cc: "Paul Elliott" <paul.elliott@arm.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Andrew Jones" <drjones@redhat.com>,
"Amit Kachhap" <amit.kachhap@arm.com>,
"Vincenzo Frascino" <vincenzo.frascino@arm.com>,
linux-arch@vger.kernel.org, "Marc Zyngier" <maz@kernel.org>,
"Eugene Syromiatnikov" <esyr@redhat.com>,
"Szabolcs Nagy" <szabolcs.nagy@arm.com>,
"H . J . Lu " <hjl.tools@gmail.com>,
"Yu-cheng Yu" <yu-cheng.yu@intel.com>,
"Kees Cook" <keescook@chromium.org>,
"Arnd Bergmann" <arnd@arndb.de>, "Jann Horn" <jannh@google.com>,
"Richard Henderson" <richard.henderson@linaro.org>,
"Kristina Martšenko" <kristina.martsenko@arm.com>,
"Mark Brown" <broonie@kernel.org>,
"Alexander Viro" <viro@zeniv.linux.org.uk>,
"Thomas Gleixner" <tglx@linutronix.de>,
linux-arm-kernel@lists.infradead.org,
"Florian Weimer" <fweimer@redhat.com>,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
"Sudakshina Das" <sudi.das@arm.com>
Subject: [PATCH v5 00/12] arm64: ARMv8.5-A: Branch Target Identification support
Date: Wed, 22 Jan 2020 21:21:32 +0000 [thread overview]
Message-ID: <20200122212144.6409-1-broonie@kernel.org> (raw)
This series implements support for ARMv8.5-A Branch Target
Identification (BTI), which is a control flow integrity protection
feature introduced as part of the ARMv8.5-A extensions.
Changes:
v5:
- Changed a bunch of -EIO to -ENOEXEC in the ELF parsing code.
- Move PSR_BTYPE defines to UAPI.
- Use compat_user_mode() rather than open coding.
- Fix a typo s/BYTPE/BTYPE/ in syscall.c
v4:
- Dropped patch fixing existing documentation as it has already been merged.
- Convert WARN_ON() to WARN_ON_ONCE() in "ELF: Add ELF program property
parsing support".
- Added display of guarded pages to ptdump.
- Updated for conversion of exception handling from assembler to C.
Notes:
* GCC 9 can compile backwards-compatible BTI-enabled code with
-mbranch-protection=bti or -mbranch-protection=standard.
* Binutils trunk supports the new ELF note, but this wasn't in a release
the last time I posted this series. (The situation _might_ have changed
in the meantime...)
Creation of a BTI-enabled binary requires _everything_ linked in to
be BTI-enabled. For now ld --force-bti can be used to override this,
but some things may break until the required C library support is in
place.
There is no straightforward way to mark a .s file as BTI-enabled:
scraping the output from gcc -S works as a quick hack for now.
readelf -n can be used to examing the program properties in an ELF
file.
* Runtime mmap() and mprotect() can be used to enable BTI on a
page-by-page basis using the new PROT_BTI, but the code in the
affected pages still needs to be written or compiled to contain the
appopriate BTI landing pads.
Dave Martin (11):
ELF: UAPI and Kconfig additions for ELF program properties
ELF: Add ELF program property parsing support
mm: Reserve asm-generic prot flag 0x10 for arch use
arm64: Basic Branch Target Identification support
elf: Allow arch to tweak initial mmap prot flags
arm64: elf: Enable BTI at exec based on ELF program properties
arm64: BTI: Decode BYTPE bits when printing PSTATE
arm64: unify native/compat instruction skipping
arm64: traps: Shuffle code to eliminate forward declarations
arm64: BTI: Reset BTYPE when skipping emulated instructions
KVM: arm64: BTI: Reset BTYPE when skipping emulated instructions
Mark Brown (1):
arm64: mm: Display guarded pages in ptdump
Documentation/arm64/cpu-feature-registers.rst | 2 +
Documentation/arm64/elf_hwcaps.rst | 4 +
arch/arm64/Kconfig | 29 ++++
arch/arm64/include/asm/cpucaps.h | 3 +-
arch/arm64/include/asm/cpufeature.h | 6 +
arch/arm64/include/asm/elf.h | 50 ++++++
arch/arm64/include/asm/esr.h | 2 +-
arch/arm64/include/asm/exception.h | 1 +
arch/arm64/include/asm/hwcap.h | 1 +
arch/arm64/include/asm/kvm_emulate.h | 6 +-
arch/arm64/include/asm/mman.h | 37 +++++
arch/arm64/include/asm/pgtable-hwdef.h | 1 +
arch/arm64/include/asm/pgtable.h | 2 +-
arch/arm64/include/asm/ptrace.h | 1 +
arch/arm64/include/asm/sysreg.h | 4 +
arch/arm64/include/uapi/asm/hwcap.h | 1 +
arch/arm64/include/uapi/asm/mman.h | 9 ++
arch/arm64/include/uapi/asm/ptrace.h | 9 ++
arch/arm64/kernel/cpufeature.c | 33 ++++
arch/arm64/kernel/cpuinfo.c | 1 +
arch/arm64/kernel/entry-common.c | 11 ++
arch/arm64/kernel/process.c | 36 ++++-
arch/arm64/kernel/ptrace.c | 2 +-
arch/arm64/kernel/signal.c | 16 ++
arch/arm64/kernel/syscall.c | 18 +++
arch/arm64/kernel/traps.c | 127 +++++++--------
arch/arm64/mm/dump.c | 5 +
fs/Kconfig.binfmt | 6 +
fs/binfmt_elf.c | 145 +++++++++++++++++-
fs/compat_binfmt_elf.c | 4 +
include/linux/elf.h | 43 ++++++
include/linux/mm.h | 3 +
include/uapi/asm-generic/mman-common.h | 1 +
include/uapi/linux/elf.h | 11 ++
34 files changed, 555 insertions(+), 75 deletions(-)
create mode 100644 arch/arm64/include/asm/mman.h
create mode 100644 arch/arm64/include/uapi/asm/mman.h
--
2.20.1
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next reply other threads:[~2020-01-22 21:22 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-22 21:21 Mark Brown [this message]
2020-01-22 21:21 ` [PATCH v5 01/12] ELF: UAPI and Kconfig additions for ELF program properties Mark Brown
2020-01-22 21:21 ` [PATCH v5 02/12] ELF: Add ELF program property parsing support Mark Brown
2020-01-22 21:21 ` [PATCH v5 03/12] mm: Reserve asm-generic prot flag 0x10 for arch use Mark Brown
2020-01-22 21:21 ` [PATCH v5 04/12] arm64: Basic Branch Target Identification support Mark Brown
2020-01-22 21:21 ` [PATCH v5 05/12] elf: Allow arch to tweak initial mmap prot flags Mark Brown
2020-01-22 21:21 ` [PATCH v5 06/12] arm64: elf: Enable BTI at exec based on ELF program properties Mark Brown
2020-01-24 19:12 ` kbuild test robot
2020-01-22 21:21 ` [PATCH v5 07/12] arm64: BTI: Decode BYTPE bits when printing PSTATE Mark Brown
2020-01-22 21:21 ` [PATCH v5 08/12] arm64: unify native/compat instruction skipping Mark Brown
2020-01-22 21:21 ` [PATCH v5 09/12] arm64: traps: Shuffle code to eliminate forward declarations Mark Brown
2020-01-24 23:00 ` kbuild test robot
2020-01-22 21:21 ` [PATCH v5 10/12] arm64: BTI: Reset BTYPE when skipping emulated instructions Mark Brown
2020-01-22 21:21 ` [PATCH v5 11/12] KVM: " Mark Brown
2020-01-22 21:21 ` [PATCH v5 12/12] arm64: mm: Display guarded pages in ptdump Mark Brown
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