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Message-ID: <37a456bf-6976-e100-e3a2-3c64a6227fa8@linaro.org>
Date: Mon, 6 Jun 2016 09:37:31 -0700
From: "Shi, Yang" <yang.shi@...aro.org>
To: aryabinin@...tuozzo.com, will.deacon@....com,
catalin.marinas@....com, mark.rutland@....com
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-mm@...ck.org, linaro-kernel@...ts.linaro.org
Subject: Re: [v2 PATCH] arm64: kasan: instrument user memory access API
Hi Will & Catalin,
Any comment for this patch?
Thanks,
Yang
On 5/27/2016 2:01 PM, Yang Shi wrote:
> The upstream commit 1771c6e1a567ea0ba2cccc0a4ffe68a1419fd8ef
> ("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.
>
> Signed-off-by: Yang Shi <yang.shi@...aro.org>
> ---
> v2:
> Adopted the comment from Andrey and Mark to add kasan_check_read/write into
> __copy_to/from_user.
>
> arch/arm64/include/asm/uaccess.h | 25 +++++++++++++++++++++----
> arch/arm64/kernel/arm64ksyms.c | 4 ++--
> arch/arm64/lib/copy_from_user.S | 4 ++--
> arch/arm64/lib/copy_to_user.S | 4 ++--
> 4 files changed, 27 insertions(+), 10 deletions(-)
>
> diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h
> index 0685d74..4dc9a8f 100644
> --- a/arch/arm64/include/asm/uaccess.h
> +++ b/arch/arm64/include/asm/uaccess.h
> @@ -23,6 +23,7 @@
> */
> #include <linux/string.h>
> #include <linux/thread_info.h>
> +#include <linux/kasan-checks.h>
>
> #include <asm/alternative.h>
> #include <asm/cpufeature.h>
> @@ -269,15 +270,29 @@ do { \
> -EFAULT; \
> })
>
> -extern unsigned long __must_check __copy_from_user(void *to, const void __user *from, unsigned long n);
> -extern unsigned long __must_check __copy_to_user(void __user *to, const void *from, unsigned long n);
> +extern unsigned long __must_check __arch_copy_from_user(void *to, const void __user *from, unsigned long n);
> +extern unsigned long __must_check __arch_copy_to_user(void __user *to, const void *from, unsigned long n);
> extern unsigned long __must_check __copy_in_user(void __user *to, const void __user *from, unsigned long n);
> extern unsigned long __must_check __clear_user(void __user *addr, unsigned long n);
>
> +static inline unsigned long __must_check __copy_from_user(void *to, const void __user *from, unsigned long n)
> +{
> + kasan_check_write(to, n);
> + return __arch_copy_from_user(to, from, n);
> +}
> +
> +static inline unsigned long __must_check __copy_to_user(void __user *to, const void *from, unsigned long n)
> +{
> + kasan_check_read(from, n);
> + return __arch_copy_to_user(to, from, n);
> +}
> +
> static inline unsigned long __must_check copy_from_user(void *to, const void __user *from, unsigned long n)
> {
> + kasan_check_write(to, n);
> +
> if (access_ok(VERIFY_READ, from, n))
> - n = __copy_from_user(to, from, n);
> + n = __arch_copy_from_user(to, from, n);
> else /* security hole - plug it */
> memset(to, 0, n);
> return n;
> @@ -285,8 +300,10 @@ static inline unsigned long __must_check copy_from_user(void *to, const void __u
>
> static inline unsigned long __must_check copy_to_user(void __user *to, const void *from, unsigned long n)
> {
> + kasan_check_read(from, n);
> +
> if (access_ok(VERIFY_WRITE, to, n))
> - n = __copy_to_user(to, from, n);
> + n = __arch_copy_to_user(to, from, n);
> return n;
> }
>
> diff --git a/arch/arm64/kernel/arm64ksyms.c b/arch/arm64/kernel/arm64ksyms.c
> index 678f30b0..2dc4440 100644
> --- a/arch/arm64/kernel/arm64ksyms.c
> +++ b/arch/arm64/kernel/arm64ksyms.c
> @@ -34,8 +34,8 @@ EXPORT_SYMBOL(copy_page);
> EXPORT_SYMBOL(clear_page);
>
> /* user mem (segment) */
> -EXPORT_SYMBOL(__copy_from_user);
> -EXPORT_SYMBOL(__copy_to_user);
> +EXPORT_SYMBOL(__arch_copy_from_user);
> +EXPORT_SYMBOL(__arch_copy_to_user);
> EXPORT_SYMBOL(__clear_user);
> EXPORT_SYMBOL(__copy_in_user);
>
> diff --git a/arch/arm64/lib/copy_from_user.S b/arch/arm64/lib/copy_from_user.S
> index 17e8306..0b90497 100644
> --- a/arch/arm64/lib/copy_from_user.S
> +++ b/arch/arm64/lib/copy_from_user.S
> @@ -66,7 +66,7 @@
> .endm
>
> end .req x5
> -ENTRY(__copy_from_user)
> +ENTRY(__arch_copy_from_user)
> ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(0)), ARM64_ALT_PAN_NOT_UAO, \
> CONFIG_ARM64_PAN)
> add end, x0, x2
> @@ -75,7 +75,7 @@ ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(1)), ARM64_ALT_PAN_NOT_UAO, \
> CONFIG_ARM64_PAN)
> mov x0, #0 // Nothing to copy
> ret
> -ENDPROC(__copy_from_user)
> +ENDPROC(__arch_copy_from_user)
>
> .section .fixup,"ax"
> .align 2
> diff --git a/arch/arm64/lib/copy_to_user.S b/arch/arm64/lib/copy_to_user.S
> index 21faae6..7a7efe2 100644
> --- a/arch/arm64/lib/copy_to_user.S
> +++ b/arch/arm64/lib/copy_to_user.S
> @@ -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
>
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