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Functions like memset()/memmove()/memcpy() do a lot of memory accesses. If a bad pointer is passed to one of these functions it is important to catch this. Compiler instrumentation cannot do this since these functions are written in assembly. KASan replaces these memory functions with instrumented variants. The original functions are declared as weak symbols so that the strong definitions in mm/kasan/kasan.c can replace them. The original functions have aliases with a '__' prefix in their name, so we can call the non-instrumented variant if needed. We must use __memcpy()/__memset() in place of memcpy()/memset() when we copy .data to RAM and when we clear .bss, because kasan_early_init cannot be called before the initialization of .data and .bss. For the kernel compression and EFI libstub's custom string libraries we need a special quirk: even if these are built without KASan enabled, they rely on the global headers for their custom string libraries, which means that e.g. memcpy() will be defined to __memcpy() and we get link failures. Since these implementations are written i C rather than assembly we use e.g. __alias(memcpy) to redirected any users back to the local implementation. Cc: Andrey Ryabinin <aryabinin@virtuozzo.com> Cc: Alexander Potapenko <glider@google.com> Cc: Dmitry Vyukov <dvyukov@google.com> Cc: kasan-dev@googlegroups.com Reviewed-by: Ard Biesheuvel <ardb@kernel.org> Tested-by: Ard Biesheuvel <ardb@kernel.org> # QEMU/KVM/mach-virt/LPAE/8G Tested-by: Florian Fainelli <f.fainelli@gmail.com> # Brahma SoCs Tested-by: Ahmad Fatoum <a.fatoum@pengutronix.de> # i.MX6Q Reported-by: Russell King - ARM Linux <rmk+kernel@armlinux.org.uk> Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de> Signed-off-by: Abbott Liu <liuwenliang@huawei.com> Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
70 lines
1.3 KiB
ArmAsm
70 lines
1.3 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* linux/arch/arm/lib/memcpy.S
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*
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* Author: Nicolas Pitre
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* Created: Sep 28, 2005
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* Copyright: MontaVista Software, Inc.
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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/unwind.h>
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#define LDR1W_SHIFT 0
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#define STR1W_SHIFT 0
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.macro ldr1w ptr reg abort
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W(ldr) \reg, [\ptr], #4
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.endm
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.macro ldr4w ptr reg1 reg2 reg3 reg4 abort
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ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4}
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.endm
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.macro ldr8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
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ldmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
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.endm
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.macro ldr1b ptr reg cond=al abort
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ldrb\cond \reg, [\ptr], #1
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.endm
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.macro str1w ptr reg abort
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W(str) \reg, [\ptr], #4
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.endm
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.macro str8w ptr reg1 reg2 reg3 reg4 reg5 reg6 reg7 reg8 abort
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stmia \ptr!, {\reg1, \reg2, \reg3, \reg4, \reg5, \reg6, \reg7, \reg8}
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.endm
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.macro str1b ptr reg cond=al abort
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strb\cond \reg, [\ptr], #1
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.endm
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.macro enter reg1 reg2
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stmdb sp!, {r0, \reg1, \reg2}
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.endm
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.macro usave reg1 reg2
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UNWIND( .save {r0, \reg1, \reg2} )
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.endm
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.macro exit reg1 reg2
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ldmfd sp!, {r0, \reg1, \reg2}
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.endm
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.text
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/* Prototype: void *memcpy(void *dest, const void *src, size_t n); */
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.weak memcpy
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ENTRY(__memcpy)
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ENTRY(mmiocpy)
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ENTRY(memcpy)
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#include "copy_template.S"
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ENDPROC(memcpy)
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ENDPROC(mmiocpy)
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ENDPROC(__memcpy)
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