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arm64: kasan: instrument user memory access API

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The upstream commit 1771c6e1a5
("x86/kasan: instrument user memory access API") added KASAN instrument to
x86 user memory access API, so added such instrument to ARM64 too.

Define __copy_to/from_user in C in order to add kasan_check_read/write call,
rename assembly implementation to __arch_copy_to/from_user.

Tested by test_kasan module.

Acked-by: Andrey Ryabinin <aryabinin@virtuozzo.com>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Yang Shi <yang.shi@linaro.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Yang Shi
2016-06-08 14:40:56 -07:00
committed by Catalin Marinas
parent 4674fdb9f1
commit bffe1baff5
4 changed files with 27 additions and 10 deletions
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4
arch/arm64/lib/copy_to_user.S
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@@ -65,7 +65,7 @@
.endm
end .req x5
ENTRY(__copy_to_user)
ENTRY(__arch_copy_to_user)
ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(0)), ARM64_ALT_PAN_NOT_UAO, \
CONFIG_ARM64_PAN)
add end, x0, x2
@@ -74,7 +74,7 @@ ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(1)), ARM64_ALT_PAN_NOT_UAO, \
CONFIG_ARM64_PAN)
mov x0, #0
ret
ENDPROC(__copy_to_user)
ENDPROC(__arch_copy_to_user)
.section .fixup,"ax"
.align 2