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39d114ddc6
This patch adds arch specific code for kernel address sanitizer (see Documentation/kasan.txt). 1/8 of kernel addresses reserved for shadow memory. There was no big enough hole for this, so virtual addresses for shadow were stolen from vmalloc area. At early boot stage the whole shadow region populated with just one physical page (kasan_zero_page). Later, this page reused as readonly zero shadow for some memory that KASan currently don't track (vmalloc). After mapping the physical memory, pages for shadow memory are allocated and mapped. Functions like memset/memmove/memcpy do a lot of memory accesses. If bad pointer passed to one of these function it is important to catch this. Compiler's instrumentation cannot do this since these functions are written in assembly. KASan replaces memory functions with manually instrumented variants. Original functions declared as weak symbols so strong definitions in mm/kasan/kasan.c could replace them. Original functions have aliases with '__' prefix in name, so we could call non-instrumented variant if needed. Some files built without kasan instrumentation (e.g. mm/slub.c). Original mem* function replaced (via #define) with prefixed variants to disable memory access checks for such files. Signed-off-by: Andrey Ryabinin <ryabinin.a.a@gmail.com> Tested-by: Linus Walleij <linus.walleij@linaro.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
78 lines
1.8 KiB
ArmAsm
78 lines
1.8 KiB
ArmAsm
/*
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* Copyright (C) 2013 ARM Ltd.
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* Copyright (C) 2013 Linaro.
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*
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* This code is based on glibc cortex strings work originally authored by Linaro
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* and re-licensed under GPLv2 for the Linux kernel. The original code can
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* be found @
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*
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* http://bazaar.launchpad.net/~linaro-toolchain-dev/cortex-strings/trunk/
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* files/head:/src/aarch64/
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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#include <asm/cache.h>
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/*
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* Copy a buffer from src to dest (alignment handled by the hardware)
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*
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* Parameters:
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* x0 - dest
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* x1 - src
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* x2 - n
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* Returns:
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* x0 - dest
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*/
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.macro ldrb1 ptr, regB, val
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ldrb \ptr, [\regB], \val
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.endm
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.macro strb1 ptr, regB, val
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strb \ptr, [\regB], \val
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.endm
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.macro ldrh1 ptr, regB, val
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ldrh \ptr, [\regB], \val
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.endm
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.macro strh1 ptr, regB, val
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strh \ptr, [\regB], \val
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.endm
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.macro ldr1 ptr, regB, val
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ldr \ptr, [\regB], \val
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.endm
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.macro str1 ptr, regB, val
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str \ptr, [\regB], \val
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.endm
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.macro ldp1 ptr, regB, regC, val
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ldp \ptr, \regB, [\regC], \val
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.endm
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.macro stp1 ptr, regB, regC, val
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stp \ptr, \regB, [\regC], \val
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.endm
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.weak memcpy
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ENTRY(__memcpy)
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ENTRY(memcpy)
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#include "copy_template.S"
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ret
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ENDPIPROC(memcpy)
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ENDPROC(__memcpy)
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