From: Vincenzo Frascino <vincenzo.frascino@arm.com> To: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, Dmitry Vyukov <dvyukov@google.com>, Andrey Ryabinin <aryabinin@virtuozzo.com>, Alexander Potapenko <glider@google.com>, Marco Elver <elver@google.com>, Evgenii Stepanov <eugenis@google.com>, Branislav Rankov <Branislav.Rankov@arm.com>, Andrey Konovalov <andreyknvl@google.com> Subject: [PATCH 0/4] arm64: ARMv8.5-A: MTE: Add async mode support Date: Wed, 6 Jan 2021 11:55:15 +0000 [thread overview] Message-ID: <20210106115519.32222-1-vincenzo.frascino@arm.com> (raw) 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> 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 -- 2.29.2
WARNING: multiple messages have this Message-ID (diff)
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>, Vincenzo Frascino <vincenzo.frascino@arm.com>, Dmitry Vyukov <dvyukov@google.com> Subject: [PATCH 0/4] arm64: ARMv8.5-A: MTE: Add async mode support Date: Wed, 6 Jan 2021 11:55:15 +0000 [thread overview] Message-ID: <20210106115519.32222-1-vincenzo.frascino@arm.com> (raw) 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> 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 -- 2.29.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2021-01-06 11:58 UTC|newest] Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-01-06 11:55 Vincenzo Frascino [this message] 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 ` Vincenzo Frascino 2021-01-06 11:55 ` [PATCH 2/4] arm64: mte: Add asynchronous mode support Vincenzo Frascino 2021-01-06 11:55 ` Vincenzo Frascino 2021-01-07 16:29 ` Andrey Konovalov 2021-01-07 16:29 ` Andrey Konovalov 2021-01-07 17:29 ` Vincenzo Frascino 2021-01-07 17:29 ` Vincenzo Frascino 2021-01-07 19:18 ` Andrey Konovalov 2021-01-07 19:18 ` Andrey Konovalov 2021-01-08 10:48 ` Vincenzo Frascino 2021-01-08 10:48 ` Vincenzo Frascino 2021-01-08 13:36 ` Andrey Konovalov 2021-01-08 13:36 ` Andrey Konovalov 2021-01-08 17:26 ` Vincenzo Frascino 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 11:55 ` Vincenzo Frascino 2021-01-06 15:01 ` kernel test robot 2021-01-06 15:01 ` kernel test robot 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 11:55 ` Vincenzo Frascino 2021-01-06 16:35 ` [PATCH 0/4] arm64: ARMv8.5-A: MTE: Add async mode support Vincenzo Frascino 2021-01-06 16:35 ` Vincenzo Frascino 2021-01-06 16:42 ` Will Deacon 2021-01-06 16:42 ` Will Deacon
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