From: Andrey Konovalov <andreyknvl@google.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>
Cc: linux-arm-kernel@lists.infradead.org,
Marco Elver <elver@google.com>,
Elena Petrova <lenaptr@google.com>,
Andrey Konovalov <andreyknvl@google.com>,
Kevin Brodsky <kevin.brodsky@arm.com>,
Branislav Rankov <Branislav.Rankov@arm.com>,
kasan-dev@googlegroups.com, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, Alexander Potapenko <glider@google.com>,
Evgenii Stepanov <eugenis@google.com>,
Andrey Ryabinin <aryabinin@virtuozzo.com>,
Andrew Morton <akpm@linux-foundation.org>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Dmitry Vyukov <dvyukov@google.com>
Subject: [PATCH v7 32/41] kasan: introduce CONFIG_KASAN_HW_TAGS
Date: Mon, 2 Nov 2020 17:04:12 +0100 [thread overview]
Message-ID: <9fd49bf636f1f9be56cf400c9ec8afc9b5bc2cfa.1604333009.git.andreyknvl@google.com> (raw)
In-Reply-To: <cover.1604333009.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>
Co-developed-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Reviewed-by: Marco Elver <elver@google.com>
---
Change-Id: I246c2def9fffa6563278db1bddfbe742ca7bdefe
---
lib/Kconfig.kasan | 58 +++++++++++++++++++++++++++++++++--------------
1 file changed, 41 insertions(+), 17 deletions(-)
diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
index ec59a0e26d09..e5f27ec8b254 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
@@ -20,11 +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
Enables KASAN (KernelAddressSANitizer) - runtime memory debugger,
@@ -37,18 +40,24 @@ 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"
depends on HAVE_ARCH_KASAN && CC_HAS_KASAN_GENERIC
select SLUB_DEBUG if SLUB
+ select CONSTRUCTORS
help
Enables generic KASAN 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).
@@ -70,11 +77,15 @@ config KASAN_SW_TAGS
bool "Software tag-based mode"
depends on HAVE_ARCH_KASAN_SW_TAGS && CC_HAS_KASAN_SW_TAGS
select SLUB_DEBUG if SLUB
+ select CONSTRUCTORS
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.
+ 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.
This mode consumes about 1/16th of available memory at kernel start
and introduces an overhead of ~20% for the rest of the allocations.
@@ -82,15 +93,27 @@ 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
@@ -114,6 +137,7 @@ 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
--
2.29.1.341.ge80a0c044ae-goog
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next prev parent reply other threads:[~2020-11-02 16:19 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-02 16:03 [PATCH v7 00/41] kasan: add hardware tag-based mode for arm64 Andrey Konovalov
2020-11-02 16:03 ` [PATCH v7 01/41] arm64: Enable armv8.5-a asm-arch option Andrey Konovalov
2020-11-02 16:03 ` [PATCH v7 02/41] arm64: mte: Add in-kernel MTE helpers Andrey Konovalov
2020-11-02 16:03 ` [PATCH v7 03/41] arm64: mte: Reset the page tag in page->flags Andrey Konovalov
2020-11-02 16:03 ` [PATCH v7 04/41] arm64: kasan: Add arch layer for memory tagging helpers Andrey Konovalov
2020-11-02 16:03 ` [PATCH v7 05/41] arm64: mte: Add in-kernel tag fault handler Andrey Konovalov
2020-11-02 16:03 ` [PATCH v7 06/41] arm64: kasan: Enable in-kernel MTE Andrey Konovalov
2020-11-02 16:03 ` [PATCH v7 07/41] arm64: mte: Convert gcr_user into an exclude mask Andrey Konovalov
2020-11-02 16:03 ` [PATCH v7 08/41] arm64: mte: Switch GCR_EL1 in kernel entry and exit Andrey Konovalov
2020-11-02 16:03 ` [PATCH v7 09/41] arm64: kasan: Align allocations for HW_TAGS Andrey Konovalov
2020-11-02 16:03 ` [PATCH v7 10/41] kasan: drop unnecessary GPL text from comment headers Andrey Konovalov
2020-11-02 16:03 ` [PATCH v7 11/41] kasan: KASAN_VMALLOC depends on KASAN_GENERIC Andrey Konovalov
2020-11-02 16:03 ` [PATCH v7 12/41] kasan: group vmalloc code Andrey Konovalov
2020-11-02 16:03 ` [PATCH v7 13/41] s390/kasan: include asm/page.h from asm/kasan.h Andrey Konovalov
2020-11-04 17:19 ` Andrey Konovalov
2020-11-04 19:25 ` Vasily Gorbik
2020-11-04 19:26 ` Andrey Konovalov
2020-11-02 16:03 ` [PATCH v7 14/41] kasan: shadow declarations only for software modes Andrey Konovalov
2020-11-02 16:03 ` [PATCH v7 15/41] kasan: rename (un)poison_shadow to (un)poison_memory Andrey Konovalov
2020-11-02 16:03 ` [PATCH v7 16/41] kasan: rename KASAN_SHADOW_* to KASAN_GRANULE_* Andrey Konovalov
2020-11-04 19:11 ` Vasily Gorbik
2020-11-04 19:22 ` Andrey Konovalov
2020-11-04 19:30 ` Vasily Gorbik
2020-11-04 19:32 ` Andrey Konovalov
2020-11-02 16:03 ` [PATCH v7 17/41] kasan: only build init.c for software modes Andrey Konovalov
2020-11-02 16:03 ` [PATCH v7 18/41] kasan: split out shadow.c from common.c Andrey Konovalov
2020-11-02 16:03 ` [PATCH v7 19/41] kasan: define KASAN_GRANULE_PAGE Andrey Konovalov
2020-11-02 16:04 ` [PATCH v7 20/41] kasan: rename report and tags files Andrey Konovalov
2020-11-02 16:04 ` [PATCH v7 21/41] kasan: don't duplicate config dependencies Andrey Konovalov
2020-11-02 16:04 ` [PATCH v7 22/41] kasan: hide invalid free check implementation Andrey Konovalov
2020-11-02 16:04 ` [PATCH v7 23/41] kasan: decode stack frame only with KASAN_STACK_ENABLE Andrey Konovalov
2020-11-02 16:04 ` [PATCH v7 24/41] kasan, arm64: only init shadow for software modes Andrey Konovalov
2020-11-02 16:04 ` [PATCH v7 25/41] kasan, arm64: only use kasan_depth " Andrey Konovalov
2020-11-02 16:04 ` [PATCH v7 26/41] kasan: rename addr_has_shadow to addr_has_metadata Andrey Konovalov
2020-11-02 16:04 ` [PATCH v7 27/41] kasan: rename print_shadow_for_address to print_memory_metadata Andrey Konovalov
2020-11-02 16:04 ` [PATCH v7 28/41] kasan: kasan_non_canonical_hook only for software modes Andrey Konovalov
2020-11-02 16:04 ` [PATCH v7 29/41] kasan: rename SHADOW layout macros to META Andrey Konovalov
2020-11-02 16:04 ` [PATCH v7 30/41] kasan: separate metadata_fetch_row for each mode Andrey Konovalov
2020-11-02 16:04 ` [PATCH v7 31/41] kasan, arm64: don't allow SW_TAGS with ARM64_MTE Andrey Konovalov
2020-11-02 16:04 ` Andrey Konovalov [this message]
2020-11-02 16:04 ` [PATCH v7 33/41] kasan: define KASAN_GRANULE_SIZE for HW_TAGS Andrey Konovalov
2020-11-02 16:04 ` [PATCH v7 34/41] kasan, x86, s390: update undef CONFIG_KASAN Andrey Konovalov
2020-11-04 17:28 ` Andrey Konovalov
2020-11-04 19:17 ` Vasily Gorbik
2020-11-02 16:04 ` [PATCH v7 35/41] kasan, arm64: expand CONFIG_KASAN checks Andrey Konovalov
2020-11-02 16:04 ` [PATCH v7 36/41] kasan, arm64: implement HW_TAGS runtime Andrey Konovalov
2020-11-02 16:04 ` [PATCH v7 37/41] kasan, arm64: print report from tag fault handler Andrey Konovalov
2020-11-02 16:04 ` [PATCH v7 38/41] kasan, mm: reset tags when accessing metadata Andrey Konovalov
2020-11-02 16:04 ` [PATCH v7 39/41] kasan, arm64: enable CONFIG_KASAN_HW_TAGS Andrey Konovalov
2020-11-02 16:04 ` [PATCH v7 40/41] kasan: add documentation for hardware tag-based mode Andrey Konovalov
2020-11-02 16:04 ` [PATCH v7 41/41] kselftest/arm64: Check GCR_EL1 after context switch Andrey Konovalov
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