From: Vincenzo Frascino <vincenzo.frascino@arm.com>
To: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com
Cc: Marco Elver <elver@google.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Branislav Rankov <Branislav.Rankov@arm.com>,
Alexander Potapenko <glider@google.com>,
Evgenii Stepanov <eugenis@google.com>,
Andrey Konovalov <andreyknvl@google.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Will Deacon <will@kernel.org>, Dmitry Vyukov <dvyukov@google.com>
Subject: Re: [PATCH 0/4] arm64: ARMv8.5-A: MTE: Add async mode support
Date: Wed, 6 Jan 2021 16:35:29 +0000 [thread overview]
Message-ID: <9a78cd4f-838d-0410-62fa-16e4ab921681@arm.com> (raw)
In-Reply-To: <20210106115519.32222-1-vincenzo.frascino@arm.com>
On 1/6/21 11:55 AM, Vincenzo Frascino wrote:
> This patchset implements the asynchronous mode support for ARMv8.5-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.
>
> The exception can be handled synchronously or asynchronously. When the
> asynchronous mode is enabled:
> - Upon fault the PE updates the TFSR_EL1 register.
> - The kernel detects the change during one of the following:
> - Context switching
> - Return to user/EL0
> - Kernel entry from EL1
> - Kernel exit to EL1
> - If the register has been updated by the PE the kernel clears it and
> reports the error.
>
> The series contains as well an optimization to mte_assign_mem_tag_range().
>
> The series is based on linux 5.11-rc2.
>
> 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/v10.async
>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will.deacon@arm.com>
Will is not in arm anymore :( Sorry Will... I will fix this in v2.
> 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@google.com>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
>
> Vincenzo Frascino (4):
> kasan, arm64: Add KASAN light mode
> arm64: mte: Add asynchronous mode support
> arm64: mte: Enable async tag check fault
> arm64: mte: Optimize mte_assign_mem_tag_range()
>
> arch/arm64/include/asm/memory.h | 2 +-
> arch/arm64/include/asm/mte-kasan.h | 5 ++-
> arch/arm64/include/asm/mte.h | 27 +++++++++++-
> arch/arm64/kernel/entry-common.c | 6 +++
> arch/arm64/kernel/mte.c | 67 ++++++++++++++++++++++++++++--
> arch/arm64/lib/mte.S | 15 -------
> include/linux/kasan.h | 1 +
> include/linux/kasan_def.h | 39 +++++++++++++++++
> mm/kasan/hw_tags.c | 24 ++---------
> mm/kasan/kasan.h | 2 +-
> 10 files changed, 145 insertions(+), 43 deletions(-)
> create mode 100644 include/linux/kasan_def.h
>
--
Regards,
Vincenzo
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next prev parent reply other threads:[~2021-01-06 16:34 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-06 11:55 [PATCH 0/4] arm64: ARMv8.5-A: MTE: Add async mode support Vincenzo Frascino
2021-01-06 11:55 ` [PATCH 1/4] kasan, arm64: Add KASAN light mode Vincenzo Frascino
2021-01-06 11:55 ` [PATCH 2/4] arm64: mte: Add asynchronous mode support Vincenzo Frascino
2021-01-07 16:29 ` Andrey Konovalov
2021-01-07 17:29 ` Vincenzo Frascino
2021-01-07 19:18 ` Andrey Konovalov
2021-01-08 10:48 ` Vincenzo Frascino
2021-01-08 13:36 ` Andrey Konovalov
2021-01-08 17:26 ` Vincenzo Frascino
2021-01-06 11:55 ` [PATCH 3/4] arm64: mte: Enable async tag check fault Vincenzo Frascino
2021-01-06 15:01 ` kernel test robot
2021-01-06 11:55 ` [PATCH 4/4] arm64: mte: Optimize mte_assign_mem_tag_range() Vincenzo Frascino
2021-01-06 16:35 ` Vincenzo Frascino [this message]
2021-01-06 16:42 ` [PATCH 0/4] arm64: ARMv8.5-A: MTE: Add async mode support Will Deacon
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