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>,
Andrey Konovalov <andreyknvl@google.com>
Subject: [PATCH v4 04/17] khwasan, arm64: adjust shadow size for CONFIG_KASAN_HW
Date: Tue, 26 Jun 2018 15:15:14 +0200 [thread overview]
Message-ID: <7bd08c76830e4cd23f90d1ed25721fca3c5f3205.1530018818.git.andreyknvl@google.com> (raw)
In-Reply-To: <cover.1530018818.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 45272266dafb..191a649f34e7 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.rc2.346.g013aa6912e-goog
next prev parent reply other threads:[~2018-06-26 13:15 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-26 13:15 [PATCH v4 00/17] khwasan: kernel hardware assisted address sanitizer Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 01/17] khwasan, mm: change kasan hooks signatures Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 02/17] khwasan: move common kasan and khwasan code to common.c Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 03/17] khwasan: add CONFIG_KASAN_GENERIC and CONFIG_KASAN_HW Andrey Konovalov
2018-06-26 13:15 ` Andrey Konovalov [this message]
2018-06-26 13:15 ` [PATCH v4 05/17] khwasan: initialize shadow to 0xff Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 06/17] khwasan, arm64: untag virt address in __kimg_to_phys and _virt_addr_is_linear Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 07/17] khwasan: add tag related helper functions Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 08/17] khwasan, arm64: fix up fault handling logic Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 09/17] khwasan, arm64: enable top byte ignore for the kernel Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 10/17] khwasan, mm: perform untagged pointers comparison in krealloc Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 11/17] khwasan: split out kasan_report.c from report.c Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 12/17] khwasan: add bug reporting routines Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 13/17] khwasan: add hooks implementation Andrey Konovalov
2018-07-25 13:44 ` Vincenzo Frascino@Foss
2018-07-31 13:05 ` Andrey Konovalov
2018-07-31 14:50 ` Andrey Ryabinin
2018-07-31 15:03 ` Dmitry Vyukov
2018-07-31 15:38 ` Christopher Lameter
2018-07-31 16:03 ` Dmitry Vyukov
2018-07-31 16:04 ` Andrey Ryabinin
2018-07-31 16:08 ` Dmitry Vyukov
2018-07-31 16:18 ` Andrey Ryabinin
2018-07-31 15:21 ` Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 14/17] khwasan, arm64: add brk handler for inline instrumentation Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 15/17] khwasan, mm, arm64: tag non slab memory allocated via pagealloc Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 16/17] khwasan: update kasan documentation Andrey Konovalov
2018-06-26 13:15 ` [PATCH v4 17/17] kasan: add SPDX-License-Identifier mark to source files Andrey Konovalov
2018-06-27 23:08 ` [PATCH v4 00/17] khwasan: kernel hardware assisted address sanitizer Andrew Morton
2018-06-28 0:04 ` Kostya Serebryany
2018-06-28 0:59 ` Vishwath Mohan
2018-06-28 1:11 ` Andrew Morton
2018-06-28 18:26 ` Andrey Konovalov
2018-06-28 7:01 ` Geert Uytterhoeven
2018-07-02 20:33 ` Matthew Wilcox
2018-07-02 23:39 ` Evgenii Stepanov
2018-06-28 18:29 ` Andrey Konovalov
2018-06-28 19:40 ` Andrew Morton
2018-06-29 12:45 ` Andrey Konovalov
2018-06-29 13:01 ` Mark Rutland
2018-06-29 14:40 ` Andrey Konovalov
2018-06-30 2:41 ` Andrew Morton
2018-07-02 19:16 ` Evgenii Stepanov
2018-07-02 19:21 ` Andrew Morton
2018-07-02 20:22 ` Evgenii Stepanov
2018-07-02 20:30 ` Andrew Morton
2018-07-05 21:02 ` Nick Desaulniers
2018-06-28 10:51 ` Dave Martin
2018-06-28 18:56 ` Andrey Konovalov
2018-06-29 10:14 ` Mark Rutland
2018-06-29 11:04 ` Dave Martin
2018-06-29 11:26 ` Luc Van Oostenryck
2018-06-29 13:18 ` Andrey Konovalov
2018-06-29 13:42 ` Dan Carpenter
2018-06-29 11:07 ` Catalin Marinas
2018-06-29 11:07 ` Will Deacon
2018-06-29 16:36 ` Andrey Konovalov
2018-07-03 17:36 ` Will Deacon
2018-07-18 17:16 ` Andrey Konovalov
2018-07-31 13:22 ` Andrey Konovalov
2018-08-01 16:35 ` Will Deacon
2018-08-01 16:52 ` Dmitry Vyukov
2018-08-02 11:10 ` Catalin Marinas
2018-08-02 11:36 ` Dmitry Vyukov
2018-08-02 13:52 ` Catalin Marinas
2018-08-02 14:11 ` Andrey Ryabinin
2018-08-03 9:23 ` Will Deacon
2018-08-03 9:42 ` Dmitry Vyukov
2018-08-08 16:27 ` Will Deacon
2018-08-08 16:53 ` Dmitry Vyukov
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