From: Andrey Konovalov <andreyknvl@google.com>
To: Andrey Ryabinin <aryabinin@virtuozzo.com>,
Alexander Potapenko <glider@google.com>,
Dmitry Vyukov <dvyukov@google.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
Christoph Lameter <cl@linux.com>,
Andrew Morton <akpm@linux-foundation.org>,
Mark Rutland <mark.rutland@arm.com>,
Nick Desaulniers <ndesaulniers@google.com>,
Marc Zyngier <marc.zyngier@arm.com>,
Dave Martin <dave.martin@arm.com>,
Ard Biesheuvel <ard.biesheuvel@linaro.org>,
"Eric W . Biederman" <ebiederm@xmission.com>,
Ingo Molnar <mingo@kernel.org>,
Paul Lawrence <paullawrence@google.com>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Arnd Bergmann <arnd@arndb.de>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Kate Stewart <kstewart@linuxfoundation.org>,
Mike Rapoport <rppt@linux.vnet.ibm.com>,
kasan-dev@googlegroups.com, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-sparse@vger.kernel.org, linux-mm@kvack.org,
linux-kbuild@vger.kernel.org
Cc: Kostya Serebryany <kcc@google.com>,
Evgeniy Stepanov <eugenis@google.com>,
Lee Smith <Lee.Smith@arm.com>,
Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>,
Jacob Bramley <Jacob.Bramley@arm.com>,
Ruben Ayrapetyan <Ruben.Ayrapetyan@arm.com>,
Jann Horn <jannh@google.com>, Mark Brand <markbrand@google.com>,
Chintan Pandya <cpandya@codeaurora.org>,
Vishwath Mohan <vishwath@google.com>,
Andrey Konovalov <andreyknvl@google.com>
Subject: [PATCH v5 04/18] khwasan, arm64: adjust shadow size for CONFIG_KASAN_HW
Date: Thu, 9 Aug 2018 21:20:56 +0200 [thread overview]
Message-ID: <ae060172d137e1f5b836c88b3c54f424ec90a78b.1533842385.git.andreyknvl@google.com> (raw)
In-Reply-To: <cover.1533842385.git.andreyknvl@google.com>
KWHASAN uses 1 shadow byte for 16 bytes of kernel memory, so it requires
1/16th of the kernel virtual address space for the shadow memory.
This commit sets KASAN_SHADOW_SCALE_SHIFT to 4 when KHWASAN is enabled.
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
arch/arm64/Makefile | 2 +-
arch/arm64/include/asm/memory.h | 13 +++++++++----
2 files changed, 10 insertions(+), 5 deletions(-)
diff --git a/arch/arm64/Makefile b/arch/arm64/Makefile
index e7101b19d590..7c92dcbaf1a6 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -93,7 +93,7 @@ endif
# KASAN_SHADOW_OFFSET = VA_START + (1 << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
# - (1 << (64 - KASAN_SHADOW_SCALE_SHIFT))
# in 32-bit arithmetic
-KASAN_SHADOW_SCALE_SHIFT := 3
+KASAN_SHADOW_SCALE_SHIFT := $(if $(CONFIG_KASAN_HW), 4, 3)
KASAN_SHADOW_OFFSET := $(shell printf "0x%08x00000000\n" $$(( \
(0xffffffff & (-1 << ($(CONFIG_ARM64_VA_BITS) - 32))) \
+ (1 << ($(CONFIG_ARM64_VA_BITS) - 32 - $(KASAN_SHADOW_SCALE_SHIFT))) \
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index 49d99214f43c..6d084431b7f7 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -74,12 +74,17 @@
#define KERNEL_END _end
/*
- * KASAN requires 1/8th of the kernel virtual address space for the shadow
- * region. KASAN can bloat the stack significantly, so double the (minimum)
- * stack size when KASAN is in use.
+ * KASAN and KHWASAN require 1/8th and 1/16th of the kernel virtual address
+ * space for the shadow region respectively. They can bloat the stack
+ * significantly, so double the (minimum) stack size when they are in use.
*/
-#ifdef CONFIG_KASAN
+#ifdef CONFIG_KASAN_GENERIC
#define KASAN_SHADOW_SCALE_SHIFT 3
+#endif
+#ifdef CONFIG_KASAN_HW
+#define KASAN_SHADOW_SCALE_SHIFT 4
+#endif
+#ifdef CONFIG_KASAN
#define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
#define KASAN_THREAD_SHIFT 1
#else
--
2.18.0.597.ga71716f1ad-goog
next prev parent reply other threads:[~2018-08-09 19:21 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-09 19:20 [PATCH v5 00/18] khwasan: kernel hardware assisted address sanitizer Andrey Konovalov
2018-08-09 19:20 ` [PATCH v5 01/18] khwasan, mm: change kasan hooks signatures Andrey Konovalov
2018-08-09 19:20 ` [PATCH v5 02/18] khwasan: move common kasan and khwasan code to common.c Andrey Konovalov
2018-08-09 19:20 ` [PATCH v5 03/18] khwasan: add CONFIG_KASAN_GENERIC and CONFIG_KASAN_HW Andrey Konovalov
2018-08-09 19:20 ` Andrey Konovalov [this message]
2018-08-09 19:20 ` [PATCH v5 05/18] khwasan: initialize shadow to 0xff Andrey Konovalov
2018-08-09 19:20 ` [PATCH v5 06/18] khwasan, arm64: untag virt address in __kimg_to_phys and _virt_addr_is_linear Andrey Konovalov
2018-08-09 19:20 ` [PATCH v5 07/18] khwasan: add tag related helper functions Andrey Konovalov
2018-08-09 19:21 ` [PATCH v5 08/18] khwasan: preassign tags to objects with ctors or SLAB_TYPESAFE_BY_RCU Andrey Konovalov
2018-08-09 19:21 ` [PATCH v5 09/18] khwasan, arm64: fix up fault handling logic Andrey Konovalov
2018-08-09 19:21 ` [PATCH v5 10/18] khwasan, arm64: enable top byte ignore for the kernel Andrey Konovalov
2018-08-09 19:21 ` [PATCH v5 11/18] khwasan, mm: perform untagged pointers comparison in krealloc Andrey Konovalov
2018-08-09 19:21 ` [PATCH v5 12/18] khwasan: split out kasan_report.c from report.c Andrey Konovalov
2018-08-09 19:21 ` [PATCH v5 13/18] khwasan: add bug reporting routines Andrey Konovalov
2018-08-09 19:21 ` [PATCH v5 14/18] khwasan: add hooks implementation Andrey Konovalov
2018-08-09 19:21 ` [PATCH v5 15/18] khwasan, arm64: add brk handler for inline instrumentation Andrey Konovalov
2018-08-09 19:21 ` [PATCH v5 16/18] khwasan, mm, arm64: tag non slab memory allocated via pagealloc Andrey Konovalov
2018-08-09 19:21 ` [PATCH v5 17/18] khwasan: update kasan documentation Andrey Konovalov
2018-08-09 19:21 ` [PATCH v5 18/18] kasan: add SPDX-License-Identifier mark to source files Andrey Konovalov
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