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 v9 05/20] kasan, arm64: adjust shadow size for tag-based mode
Date: Fri, 21 Sep 2018 17:13:27 +0200 [thread overview]
Message-ID: <10cf432f0ffdb67fbd495acc61bdd9517af5b7b7.1537542735.git.andreyknvl@google.com> (raw)
In-Reply-To: <cover.1537542735.git.andreyknvl@google.com>
Tag-based KASAN 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 the tag-based KASAN
mode 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 106039d25e2f..11f4750d8d41 100644
--- a/arch/arm64/Makefile
+++ b/arch/arm64/Makefile
@@ -94,7 +94,7 @@ 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_SW_TAGS), 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 b96442960aea..0f1e024a951f 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.
+ * Generic and tag-based KASAN 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_SW_TAGS
+#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
--
2.19.0.444.g18242da7ef-goog
next prev parent reply other threads:[~2018-09-21 15:15 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-21 15:13 [PATCH v9 00/20] kasan: add software tag-based mode for arm64 Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 01/20] kasan, mm: change hooks signatures Andrey Konovalov
2018-10-31 16:33 ` Andrey Ryabinin
2018-09-21 15:13 ` [PATCH v9 02/20] kasan: move common generic and tag-based code to common.c Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 03/20] kasan: rename source files to reflect the new naming scheme Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 04/20] kasan: add CONFIG_KASAN_GENERIC and CONFIG_KASAN_SW_TAGS Andrey Konovalov
2018-09-21 15:13 ` Andrey Konovalov [this message]
2018-09-21 15:13 ` [PATCH v9 06/20] kasan: initialize shadow to 0xff for tag-based mode Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 07/20] kasan, arm64: untag address in __kimg_to_phys and _virt_addr_is_linear Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 08/20] kasan: add tag related helper functions Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 09/20] kasan: preassign tags to objects with ctors or SLAB_TYPESAFE_BY_RCU Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 10/20] mm: move obj_to_index to include/linux/slab_def.h Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 11/20] kasan, arm64: fix up fault handling logic Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 12/20] kasan, arm64: enable top byte ignore for the kernel Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 13/20] kasan, mm: perform untagged pointers comparison in krealloc Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 14/20] kasan: split out generic_report.c from report.c Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 15/20] kasan: add bug reporting routines for tag-based mode Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 16/20] kasan: add hooks implementation " Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 17/20] kasan, arm64: add brk handler for inline instrumentation Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 18/20] kasan, mm, arm64: tag non slab memory allocated via pagealloc Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 19/20] kasan: update documentation Andrey Konovalov
2018-10-02 13:42 ` Andrey Konovalov
2018-09-21 15:13 ` [PATCH v9 20/20] kasan: add SPDX-License-Identifier mark to source files Andrey Konovalov
2018-09-24 15:14 ` [PATCH v9 00/20] kasan: add software tag-based mode for arm64 Dmitry Vyukov
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