From: Andrey Konovalov <andreyknvl@google.com> To: Dmitry Vyukov <dvyukov@google.com>, Vincenzo Frascino <vincenzo.frascino@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, kasan-dev@googlegroups.com Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>, Alexander Potapenko <glider@google.com>, Marco Elver <elver@google.com>, Evgenii Stepanov <eugenis@google.com>, Elena Petrova <lenaptr@google.com>, Branislav Rankov <Branislav.Rankov@arm.com>, Kevin Brodsky <kevin.brodsky@arm.com>, Will Deacon <will.deacon@arm.com>, Andrew Morton <akpm@linux-foundation.org>, linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Andrey Konovalov <andreyknvl@google.com> Subject: [PATCH v4 22/39] kasan: introduce CONFIG_KASAN_HW_TAGS Date: Fri, 2 Oct 2020 01:10:23 +0200 [thread overview] Message-ID: <d9b8787e4037a122aacc9e9f53e6e1e65f0b7fc1.1601593784.git.andreyknvl@google.com> (raw) In-Reply-To: <cover.1601593784.git.andreyknvl@google.com> This patch adds a configuration option for a new KASAN mode called hardware tag-based KASAN. This mode uses the memory tagging approach like the software tag-based mode, but relies on arm64 Memory Tagging Extension feature for tag management and access checking. Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Reviewed-by: Marco Elver <elver@google.com> --- Change-Id: I246c2def9fffa6563278db1bddfbe742ca7bdefe --- lib/Kconfig.kasan | 56 +++++++++++++++++++++++++++++++++-------------- 1 file changed, 39 insertions(+), 17 deletions(-) diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan index f73d5979575a..516d3a24f7d7 100644 --- a/lib/Kconfig.kasan +++ b/lib/Kconfig.kasan @@ -6,7 +6,10 @@ config HAVE_ARCH_KASAN config HAVE_ARCH_KASAN_SW_TAGS bool -config HAVE_ARCH_KASAN_VMALLOC +config HAVE_ARCH_KASAN_HW_TAGS + bool + +config HAVE_ARCH_KASAN_VMALLOC bool config CC_HAS_KASAN_GENERIC @@ -20,10 +23,11 @@ config CC_HAS_WORKING_NOSANITIZE_ADDRESS menuconfig KASAN bool "KASAN: runtime memory debugger" - depends on (HAVE_ARCH_KASAN && CC_HAS_KASAN_GENERIC) || \ - (HAVE_ARCH_KASAN_SW_TAGS && CC_HAS_KASAN_SW_TAGS) + depends on (((HAVE_ARCH_KASAN && CC_HAS_KASAN_GENERIC) || \ + (HAVE_ARCH_KASAN_SW_TAGS && CC_HAS_KASAN_SW_TAGS)) && \ + CC_HAS_WORKING_NOSANITIZE_ADDRESS) || \ + HAVE_ARCH_KASAN_HW_TAGS depends on (SLUB && SYSFS) || (SLAB && !DEBUG_SLAB) - depends on CC_HAS_WORKING_NOSANITIZE_ADDRESS select CONSTRUCTORS select STACKDEPOT help @@ -37,13 +41,18 @@ choice prompt "KASAN mode" default KASAN_GENERIC help - KASAN has two modes: generic KASAN (similar to userspace ASan, - x86_64/arm64/xtensa, enabled with CONFIG_KASAN_GENERIC) and - software tag-based KASAN (a version based on software memory - tagging, arm64 only, similar to userspace HWASan, enabled with - CONFIG_KASAN_SW_TAGS). + KASAN has three modes: + 1. generic KASAN (similar to userspace ASan, + x86_64/arm64/xtensa, enabled with CONFIG_KASAN_GENERIC), + 2. software tag-based KASAN (arm64 only, based on software + memory tagging (similar to userspace HWASan), enabled with + CONFIG_KASAN_SW_TAGS), and + 3. hardware tag-based KASAN (arm64 only, based on hardware + memory tagging, enabled with CONFIG_KASAN_HW_TAGS). + + All KASAN modes are strictly debugging features. - Both generic and tag-based KASAN are strictly debugging features. + For better error reports enable CONFIG_STACKTRACE. config KASAN_GENERIC bool "Generic mode" @@ -61,8 +70,6 @@ config KASAN_GENERIC and introduces an overhead of ~x1.5 for the rest of the allocations. The performance slowdown is ~x3. - For better error detection enable CONFIG_STACKTRACE. - Currently CONFIG_KASAN_GENERIC doesn't work with CONFIG_DEBUG_SLAB (the resulting kernel does not boot). @@ -73,9 +80,11 @@ config KASAN_SW_TAGS help Enables software tag-based KASAN mode. - This mode requires Top Byte Ignore support by the CPU and therefore - is only supported for arm64. This mode requires Clang version 7.0.0 - or later. + This mode require software memory tagging support in the form of + HWASan-like compiler instrumentation. + + Currently this mode is only implemented for arm64 CPUs and relies on + Top Byte Ignore. This mode requires Clang version 7.0.0 or later. This mode consumes about 1/16th of available memory at kernel start and introduces an overhead of ~20% for the rest of the allocations. @@ -83,15 +92,27 @@ config KASAN_SW_TAGS casting and comparison, as it embeds tags into the top byte of each pointer. - For better error detection enable CONFIG_STACKTRACE. - Currently CONFIG_KASAN_SW_TAGS doesn't work with CONFIG_DEBUG_SLAB (the resulting kernel does not boot). +config KASAN_HW_TAGS + bool "Hardware tag-based mode" + depends on HAVE_ARCH_KASAN_HW_TAGS + depends on SLUB + help + Enables hardware tag-based KASAN mode. + + This mode requires hardware memory tagging support, and can be used + by any architecture that provides it. + + Currently this mode is only implemented for arm64 CPUs starting from + ARMv8.5 and relies on Memory Tagging Extension and Top Byte Ignore. + endchoice choice prompt "Instrumentation type" + depends on KASAN_GENERIC || KASAN_SW_TAGS default KASAN_OUTLINE config KASAN_OUTLINE @@ -115,6 +136,7 @@ endchoice config KASAN_STACK_ENABLE bool "Enable stack instrumentation (unsafe)" if CC_IS_CLANG && !COMPILE_TEST + depends on KASAN_GENERIC || KASAN_SW_TAGS help The LLVM stack address sanitizer has a know problem that causes excessive stack usage in a lot of functions, see -- 2.28.0.709.gb0816b6eb0-goog
WARNING: multiple messages have this Message-ID (diff)
From: Andrey Konovalov <andreyknvl@google.com> To: Dmitry Vyukov <dvyukov@google.com>, Vincenzo Frascino <vincenzo.frascino@arm.com>, Catalin Marinas <catalin.marinas@arm.com>, kasan-dev@googlegroups.com Cc: Marco Elver <elver@google.com>, Elena Petrova <lenaptr@google.com>, Andrey Konovalov <andreyknvl@google.com>, Kevin Brodsky <kevin.brodsky@arm.com>, Will Deacon <will.deacon@arm.com>, Branislav Rankov <Branislav.Rankov@arm.com>, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Alexander Potapenko <glider@google.com>, linux-arm-kernel@lists.infradead.org, Andrey Ryabinin <aryabinin@virtuozzo.com>, Andrew Morton <akpm@linux-foundation.org>, Evgenii Stepanov <eugenis@google.com> Subject: [PATCH v4 22/39] kasan: introduce CONFIG_KASAN_HW_TAGS Date: Fri, 2 Oct 2020 01:10:23 +0200 [thread overview] Message-ID: <d9b8787e4037a122aacc9e9f53e6e1e65f0b7fc1.1601593784.git.andreyknvl@google.com> (raw) In-Reply-To: <cover.1601593784.git.andreyknvl@google.com> This patch adds a configuration option for a new KASAN mode called hardware tag-based KASAN. This mode uses the memory tagging approach like the software tag-based mode, but relies on arm64 Memory Tagging Extension feature for tag management and access checking. Signed-off-by: Andrey Konovalov <andreyknvl@google.com> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Reviewed-by: Marco Elver <elver@google.com> --- Change-Id: I246c2def9fffa6563278db1bddfbe742ca7bdefe --- lib/Kconfig.kasan | 56 +++++++++++++++++++++++++++++++++-------------- 1 file changed, 39 insertions(+), 17 deletions(-) diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan index f73d5979575a..516d3a24f7d7 100644 --- a/lib/Kconfig.kasan +++ b/lib/Kconfig.kasan @@ -6,7 +6,10 @@ config HAVE_ARCH_KASAN config HAVE_ARCH_KASAN_SW_TAGS bool -config HAVE_ARCH_KASAN_VMALLOC +config HAVE_ARCH_KASAN_HW_TAGS + bool + +config HAVE_ARCH_KASAN_VMALLOC bool config CC_HAS_KASAN_GENERIC @@ -20,10 +23,11 @@ config CC_HAS_WORKING_NOSANITIZE_ADDRESS menuconfig KASAN bool "KASAN: runtime memory debugger" - depends on (HAVE_ARCH_KASAN && CC_HAS_KASAN_GENERIC) || \ - (HAVE_ARCH_KASAN_SW_TAGS && CC_HAS_KASAN_SW_TAGS) + depends on (((HAVE_ARCH_KASAN && CC_HAS_KASAN_GENERIC) || \ + (HAVE_ARCH_KASAN_SW_TAGS && CC_HAS_KASAN_SW_TAGS)) && \ + CC_HAS_WORKING_NOSANITIZE_ADDRESS) || \ + HAVE_ARCH_KASAN_HW_TAGS depends on (SLUB && SYSFS) || (SLAB && !DEBUG_SLAB) - depends on CC_HAS_WORKING_NOSANITIZE_ADDRESS select CONSTRUCTORS select STACKDEPOT help @@ -37,13 +41,18 @@ choice prompt "KASAN mode" default KASAN_GENERIC help - KASAN has two modes: generic KASAN (similar to userspace ASan, - x86_64/arm64/xtensa, enabled with CONFIG_KASAN_GENERIC) and - software tag-based KASAN (a version based on software memory - tagging, arm64 only, similar to userspace HWASan, enabled with - CONFIG_KASAN_SW_TAGS). + KASAN has three modes: + 1. generic KASAN (similar to userspace ASan, + x86_64/arm64/xtensa, enabled with CONFIG_KASAN_GENERIC), + 2. software tag-based KASAN (arm64 only, based on software + memory tagging (similar to userspace HWASan), enabled with + CONFIG_KASAN_SW_TAGS), and + 3. hardware tag-based KASAN (arm64 only, based on hardware + memory tagging, enabled with CONFIG_KASAN_HW_TAGS). + + All KASAN modes are strictly debugging features. - Both generic and tag-based KASAN are strictly debugging features. + For better error reports enable CONFIG_STACKTRACE. config KASAN_GENERIC bool "Generic mode" @@ -61,8 +70,6 @@ config KASAN_GENERIC and introduces an overhead of ~x1.5 for the rest of the allocations. The performance slowdown is ~x3. - For better error detection enable CONFIG_STACKTRACE. - Currently CONFIG_KASAN_GENERIC doesn't work with CONFIG_DEBUG_SLAB (the resulting kernel does not boot). @@ -73,9 +80,11 @@ config KASAN_SW_TAGS help Enables software tag-based KASAN mode. - This mode requires Top Byte Ignore support by the CPU and therefore - is only supported for arm64. This mode requires Clang version 7.0.0 - or later. + This mode require software memory tagging support in the form of + HWASan-like compiler instrumentation. + + Currently this mode is only implemented for arm64 CPUs and relies on + Top Byte Ignore. This mode requires Clang version 7.0.0 or later. This mode consumes about 1/16th of available memory at kernel start and introduces an overhead of ~20% for the rest of the allocations. @@ -83,15 +92,27 @@ config KASAN_SW_TAGS casting and comparison, as it embeds tags into the top byte of each pointer. - For better error detection enable CONFIG_STACKTRACE. - Currently CONFIG_KASAN_SW_TAGS doesn't work with CONFIG_DEBUG_SLAB (the resulting kernel does not boot). +config KASAN_HW_TAGS + bool "Hardware tag-based mode" + depends on HAVE_ARCH_KASAN_HW_TAGS + depends on SLUB + help + Enables hardware tag-based KASAN mode. + + This mode requires hardware memory tagging support, and can be used + by any architecture that provides it. + + Currently this mode is only implemented for arm64 CPUs starting from + ARMv8.5 and relies on Memory Tagging Extension and Top Byte Ignore. + endchoice choice prompt "Instrumentation type" + depends on KASAN_GENERIC || KASAN_SW_TAGS default KASAN_OUTLINE config KASAN_OUTLINE @@ -115,6 +136,7 @@ endchoice config KASAN_STACK_ENABLE bool "Enable stack instrumentation (unsafe)" if CC_IS_CLANG && !COMPILE_TEST + depends on KASAN_GENERIC || KASAN_SW_TAGS help The LLVM stack address sanitizer has a know problem that causes excessive stack usage in a lot of functions, see -- 2.28.0.709.gb0816b6eb0-goog _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2020-10-01 23:12 UTC|newest] Thread overview: 138+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-10-01 23:10 [PATCH v4 00/39] kasan: add hardware tag-based mode for arm64 Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 01/39] kasan: drop unnecessary GPL text from comment headers Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 02/39] kasan: KASAN_VMALLOC depends on KASAN_GENERIC Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 03/39] kasan: group vmalloc code Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 04/39] kasan: shadow declarations only for software modes Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 05/39] kasan: rename (un)poison_shadow to (un)poison_memory Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 06/39] kasan: rename KASAN_SHADOW_* to KASAN_GRANULE_* Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 07/39] kasan: only build init.c for software modes Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 08/39] kasan: split out shadow.c from common.c Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 09/39] kasan: define KASAN_GRANULE_PAGE Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 10/39] kasan: rename report and tags files Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 11/39] kasan: don't duplicate config dependencies Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 12/39] kasan: hide invalid free check implementation Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 13/39] kasan: decode stack frame only with KASAN_STACK_ENABLE Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 14/39] kasan, arm64: only init shadow for software modes Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 15/39] kasan, arm64: only use kasan_depth " Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 16/39] kasan: rename addr_has_shadow to addr_has_metadata Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 17/39] kasan: rename print_shadow_for_address to print_memory_metadata Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 18/39] kasan: kasan_non_canonical_hook only for software modes Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 19/39] kasan: rename SHADOW layout macros to META Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 20/39] kasan: separate metadata_fetch_row for each mode Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 21/39] kasan, arm64: don't allow SW_TAGS with ARM64_MTE Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov [this message] 2020-10-01 23:10 ` [PATCH v4 22/39] kasan: introduce CONFIG_KASAN_HW_TAGS Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 23/39] arm64: Enable armv8.5-a asm-arch option Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 24/39] arm64: mte: Add in-kernel MTE helpers Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-02 13:51 ` Catalin Marinas 2020-10-02 13:51 ` Catalin Marinas 2020-10-01 23:10 ` [PATCH v4 25/39] arm64: kasan: Add arch layer for memory tagging helpers Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 26/39] arm64: mte: Add in-kernel tag fault handler Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 27/39] arm64: kasan: Enable in-kernel MTE Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-02 14:00 ` Catalin Marinas 2020-10-02 14:00 ` Catalin Marinas 2020-10-01 23:10 ` [PATCH v4 28/39] arm64: mte: Convert gcr_user into an exclude mask Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 29/39] arm64: mte: Switch GCR_EL1 in kernel entry and exit Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-02 14:06 ` Catalin Marinas 2020-10-02 14:06 ` Catalin Marinas 2020-10-08 18:24 ` Vincenzo Frascino 2020-10-08 18:24 ` Vincenzo Frascino 2020-10-09 8:11 ` Catalin Marinas 2020-10-09 8:11 ` Catalin Marinas 2020-10-09 9:56 ` Vincenzo Frascino 2020-10-09 9:56 ` Vincenzo Frascino 2020-10-09 10:16 ` Catalin Marinas 2020-10-09 10:16 ` Catalin Marinas 2020-10-09 10:21 ` Vincenzo Frascino 2020-10-09 10:21 ` Vincenzo Frascino 2020-10-01 23:10 ` [PATCH v4 30/39] arm64: kasan: Enable TBI EL1 Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-02 14:10 ` Catalin Marinas 2020-10-02 14:10 ` Catalin Marinas 2020-10-01 23:10 ` [PATCH v4 31/39] arm64: kasan: Align allocations for HW_TAGS Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 32/39] kasan: define KASAN_GRANULE_SIZE " Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 33/39] kasan, x86, s390: update undef CONFIG_KASAN Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 34/39] kasan, arm64: expand CONFIG_KASAN checks Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 35/39] kasan, arm64: implement HW_TAGS runtime Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 36/39] kasan, arm64: print report from tag fault handler Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 37/39] kasan, mm: reset tags when accessing metadata Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 38/39] kasan, arm64: enable CONFIG_KASAN_HW_TAGS Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` [PATCH v4 39/39] kasan: add documentation for hardware tag-based mode Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov 2020-10-01 23:10 ` Andrey Konovalov
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