| Message ID | 20211004202253.27857-1-vincenzo.frascino@arm.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | arm64: ARMv8.7-A: MTE: Add asymm in-kernel support | expand |
On Mon, 4 Oct 2021 21:22:48 +0100 Vincenzo Frascino <vincenzo.frascino@arm.com> wrote: > This series implements the in-kernel asymmetric mode support for > ARMv8.7-A Memory Tagging Extension (MTE), which is a debugging feature > that allows to detect with the help of the architecture the C and C++ > programmatic memory errors like buffer overflow, use-after-free, > use-after-return, etc. I'm not sure which subsystem tree you were targeting here, so I grabbed them. I'll drop the -mm copy if this material pops up in a linux-next via a different tree.
Hi Andrew, On Tue, Oct 05, 2021 at 03:25:31PM -0700, Andrew Morton wrote: > On Mon, 4 Oct 2021 21:22:48 +0100 Vincenzo Frascino <vincenzo.frascino@arm.com> wrote: > > > This series implements the in-kernel asymmetric mode support for > > ARMv8.7-A Memory Tagging Extension (MTE), which is a debugging feature > > that allows to detect with the help of the architecture the C and C++ > > programmatic memory errors like buffer overflow, use-after-free, > > use-after-return, etc. > > I'm not sure which subsystem tree you were targeting here, so I grabbed > them. I'll drop the -mm copy if this material pops up in a linux-next > via a different tree. I'll queue 'em via the arm64 tree, as we already have some MTE work over there and most of this series seems to be arch changes. Cheers, Will
This series implements the in-kernel asymmetric mode support for ARMv8.7-A Memory Tagging Extension (MTE), which is a debugging feature that allows to detect with the help of the architecture the C and C++ programmatic memory errors like buffer overflow, use-after-free, use-after-return, etc. MTE is built on top of the AArch64 v8.0 virtual address tagging TBI (Top Byte Ignore) feature and allows a task to set a 4 bit tag on any subset of its address space that is multiple of a 16 bytes granule. MTE is based on a lock-key mechanism where the lock is the tag associated to the physical memory and the key is the tag associated to the virtual address. When MTE is enabled and tags are set for ranges of address space of a task, the PE will compare the tag related to the physical memory with the tag related to the virtual address (tag check operation). Access to the memory is granted only if the two tags match. In case of mismatch the PE will raise an exception. When asymmetric mode is present, the CPU triggers a fault on a tag mismatch during a load operation and asynchronously updates a register when a tag mismatch is detected during a store operation. Note: The userspace support will be sent with a future patch series. The series is based on linux-v5.15-rc4. To simplify the testing a tree with the new patches on top has been made available at [1]. [1] https://git.gitlab.arm.com/linux-arm/linux-vf.git mte/v2.asymm Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Alexander Potapenko <glider@google.com> Cc: Marco Elver <elver@google.com> Cc: Evgenii Stepanov <eugenis@google.com> Cc: Branislav Rankov <Branislav.Rankov@arm.com> Cc: Andrey Konovalov <andreyknvl@gmail.com> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Vincenzo Frascino (5): kasan: Remove duplicate of kasan_flag_async arm64: mte: Bitfield definitions for Asymm MTE arm64: mte: CPU feature detection for Asymm MTE arm64: mte: Add asymmetric mode support kasan: Extend KASAN mode kernel parameter Documentation/dev-tools/kasan.rst | 7 +++++-- arch/arm64/include/asm/memory.h | 1 + arch/arm64/include/asm/mte-kasan.h | 5 +++++ arch/arm64/include/asm/sysreg.h | 3 +++ arch/arm64/kernel/cpufeature.c | 10 +++++++++ arch/arm64/kernel/mte.c | 33 +++++++++++++++++++++++++++++- arch/arm64/tools/cpucaps | 1 + lib/test_kasan.c | 2 +- mm/kasan/hw_tags.c | 27 +++++++++++++++++++----- mm/kasan/kasan.h | 24 +++++++++++++++++----- mm/kasan/report.c | 2 +- 11 files changed, 100 insertions(+), 15 deletions(-)