* [PATCH v2 1/2] kasan: fix prototype author email address
2018-01-12 16:49 [PATCH v2 0/2] kasan: a few cleanups Andrey Konovalov
@ 2018-01-12 16:49 ` Andrey Konovalov
2018-01-12 16:49 ` [PATCH v2 2/2] kasan: clean up KASAN_SHADOW_SCALE_SHIFT usage Andrey Konovalov
1 sibling, 0 replies; 4+ messages in thread
From: Andrey Konovalov @ 2018-01-12 16:49 UTC (permalink / raw)
To: Andrey Ryabinin, Alexander Potapenko, Dmitry Vyukov,
Catalin Marinas, Will Deacon, Thomas Gleixner, Ingo Molnar,
H . Peter Anvin, kasan-dev, linux-mm, linux-arm-kernel, x86,
linux-kernel
Cc: Kostya Serebryany, Andrey Konovalov
Use the new one.
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
mm/kasan/kasan.c | 2 +-
mm/kasan/report.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c
index 405bba487df5..cb4065f31f7f 100644
--- a/mm/kasan/kasan.c
+++ b/mm/kasan/kasan.c
@@ -5,7 +5,7 @@
* Author: Andrey Ryabinin <ryabinin.a.a@gmail.com>
*
* Some code borrowed from https://github.com/xairy/kasan-prototype by
- * Andrey Konovalov <adech.fo@gmail.com>
+ * Andrey Konovalov <andreyknvl@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index 410c8235e671..eee796a005ac 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -5,7 +5,7 @@
* Author: Andrey Ryabinin <ryabinin.a.a@gmail.com>
*
* Some code borrowed from https://github.com/xairy/kasan-prototype by
- * Andrey Konovalov <adech.fo@gmail.com>
+ * Andrey Konovalov <andreyknvl@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
--
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* [PATCH v2 2/2] kasan: clean up KASAN_SHADOW_SCALE_SHIFT usage
2018-01-12 16:49 [PATCH v2 0/2] kasan: a few cleanups Andrey Konovalov
2018-01-12 16:49 ` [PATCH v2 1/2] kasan: fix prototype author email address Andrey Konovalov
@ 2018-01-12 16:49 ` Andrey Konovalov
2018-01-15 16:35 ` Andrey Ryabinin
1 sibling, 1 reply; 4+ messages in thread
From: Andrey Konovalov @ 2018-01-12 16:49 UTC (permalink / raw)
To: Andrey Ryabinin, Alexander Potapenko, Dmitry Vyukov,
Catalin Marinas, Will Deacon, Thomas Gleixner, Ingo Molnar,
H . Peter Anvin, kasan-dev, linux-mm, linux-arm-kernel, x86,
linux-kernel
Cc: Kostya Serebryany, Andrey Konovalov
Right now the fact that KASAN uses a single shadow byte for 8 bytes of
memory is scattered all over the code.
This change defines KASAN_SHADOW_SCALE_SHIFT early in asm include files
and makes use of this constant where necessary.
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
---
arch/arm64/include/asm/kasan.h | 17 ++++++++++-------
arch/arm64/include/asm/memory.h | 3 ++-
arch/arm64/mm/kasan_init.c | 3 ++-
arch/x86/include/asm/kasan.h | 12 ++++++++----
include/linux/kasan.h | 2 --
5 files changed, 22 insertions(+), 15 deletions(-)
diff --git a/arch/arm64/include/asm/kasan.h b/arch/arm64/include/asm/kasan.h
index e266f80e45b7..b1591f4cbbdb 100644
--- a/arch/arm64/include/asm/kasan.h
+++ b/arch/arm64/include/asm/kasan.h
@@ -12,7 +12,8 @@
/*
* KASAN_SHADOW_START: beginning of the kernel virtual addresses.
- * KASAN_SHADOW_END: KASAN_SHADOW_START + 1/8 of kernel virtual addresses.
+ * KASAN_SHADOW_END: KASAN_SHADOW_START + 1/N of kernel virtual addresses,
+ * where N = (1 << KASAN_SHADOW_SCALE_SHIFT).
*/
#define KASAN_SHADOW_START (VA_START)
#define KASAN_SHADOW_END (KASAN_SHADOW_START + KASAN_SHADOW_SIZE)
@@ -20,14 +21,16 @@
/*
* This value is used to map an address to the corresponding shadow
* address by the following formula:
- * shadow_addr = (address >> 3) + KASAN_SHADOW_OFFSET;
+ * shadow_addr = (address >> KASAN_SHADOW_SCALE_SHIFT) + KASAN_SHADOW_OFFSET
*
- * (1 << 61) shadow addresses - [KASAN_SHADOW_OFFSET,KASAN_SHADOW_END]
- * cover all 64-bits of virtual addresses. So KASAN_SHADOW_OFFSET
- * should satisfy the following equation:
- * KASAN_SHADOW_OFFSET = KASAN_SHADOW_END - (1ULL << 61)
+ * (1 << (64 - KASAN_SHADOW_SCALE_SHIFT)) shadow addresses that lie in range
+ * [KASAN_SHADOW_OFFSET, KASAN_SHADOW_END) cover all 64-bits of virtual
+ * addresses. So KASAN_SHADOW_OFFSET should satisfy the following equation:
+ * KASAN_SHADOW_OFFSET = KASAN_SHADOW_END -
+ * (1ULL << (64 - KASAN_SHADOW_SCALE_SHIFT))
*/
-#define KASAN_SHADOW_OFFSET (KASAN_SHADOW_END - (1ULL << (64 - 3)))
+#define KASAN_SHADOW_OFFSET (KASAN_SHADOW_END - (1ULL << \
+ (64 - KASAN_SHADOW_SCALE_SHIFT)))
void kasan_init(void);
void kasan_copy_shadow(pgd_t *pgdir);
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index d4bae7d6e0d8..50fa96a49792 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -85,7 +85,8 @@
* stack size when KASAN is in use.
*/
#ifdef CONFIG_KASAN
-#define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - 3))
+#define KASAN_SHADOW_SCALE_SHIFT 3
+#define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
#define KASAN_THREAD_SHIFT 1
#else
#define KASAN_SHADOW_SIZE (0)
diff --git a/arch/arm64/mm/kasan_init.c b/arch/arm64/mm/kasan_init.c
index acba49fb5aac..6e02e6fb4c7b 100644
--- a/arch/arm64/mm/kasan_init.c
+++ b/arch/arm64/mm/kasan_init.c
@@ -135,7 +135,8 @@ static void __init kasan_pgd_populate(unsigned long addr, unsigned long end,
/* The early shadow maps everything to a single page of zeroes */
asmlinkage void __init kasan_early_init(void)
{
- BUILD_BUG_ON(KASAN_SHADOW_OFFSET != KASAN_SHADOW_END - (1UL << 61));
+ BUILD_BUG_ON(KASAN_SHADOW_OFFSET !=
+ KASAN_SHADOW_END - (1UL << (64 - KASAN_SHADOW_SCALE_SHIFT)));
BUILD_BUG_ON(!IS_ALIGNED(KASAN_SHADOW_START, PGDIR_SIZE));
BUILD_BUG_ON(!IS_ALIGNED(KASAN_SHADOW_END, PGDIR_SIZE));
kasan_pgd_populate(KASAN_SHADOW_START, KASAN_SHADOW_END, NUMA_NO_NODE,
diff --git a/arch/x86/include/asm/kasan.h b/arch/x86/include/asm/kasan.h
index b577dd0916aa..13e70da38bed 100644
--- a/arch/x86/include/asm/kasan.h
+++ b/arch/x86/include/asm/kasan.h
@@ -4,6 +4,7 @@
#include <linux/const.h>
#define KASAN_SHADOW_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
+#define KASAN_SHADOW_SCALE_SHIFT 3
/*
* Compiler uses shadow offset assuming that addresses start
@@ -12,12 +13,15 @@
* 'kernel address space start' >> KASAN_SHADOW_SCALE_SHIFT
*/
#define KASAN_SHADOW_START (KASAN_SHADOW_OFFSET + \
- ((-1UL << __VIRTUAL_MASK_SHIFT) >> 3))
+ ((-1UL << __VIRTUAL_MASK_SHIFT) >> \
+ KASAN_SHADOW_SCALE_SHIFT))
/*
- * 47 bits for kernel address -> (47 - 3) bits for shadow
- * 56 bits for kernel address -> (56 - 3) bits for shadow
+ * 47 bits for kernel address -> (47 - KASAN_SHADOW_SCALE_SHIFT) bits for shadow
+ * 56 bits for kernel address -> (56 - KASAN_SHADOW_SCALE_SHIFT) bits for shadow
*/
-#define KASAN_SHADOW_END (KASAN_SHADOW_START + (1ULL << (__VIRTUAL_MASK_SHIFT - 3)))
+#define KASAN_SHADOW_END (KASAN_SHADOW_START + \
+ (1ULL << (__VIRTUAL_MASK_SHIFT - \
+ KASAN_SHADOW_SCALE_SHIFT)))
#ifndef __ASSEMBLY__
diff --git a/include/linux/kasan.h b/include/linux/kasan.h
index e3eb834c9a35..e9eaa964473a 100644
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -11,8 +11,6 @@ struct task_struct;
#ifdef CONFIG_KASAN
-#define KASAN_SHADOW_SCALE_SHIFT 3
-
#include <asm/kasan.h>
#include <asm/pgtable.h>
--
2.16.0.rc1.238.g530d649a79-goog
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