linux-kernel - RE: [PATCH v11 3/9] arm64: add copy_to/from_user to kprobes blacklist

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Date:	Thu, 17 Mar 2016 12:04:30 +0000
From:	平松雅巳 / HIRAMATU，MASAMI 
	<masami.hiramatsu.pt@...achi.com>
To:	"'David Long'" <dave.long@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Sandeepa Prabhu <sandeepa.s.prabhu@...il.com>,
	William Cohen <wcohen@...hat.com>,
	"Pratyush Anand" <panand@...hat.com>,
	Steve Capper <steve.capper@...aro.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Marc Zyngier <marc.zyngier@....com>
CC:	Mark Rutland <mark.rutland@....com>,
	Petr Mladek <pmladek@...e.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	John Blackwood <john.blackwood@...r.com>,
	Feng Kan <fkan@....com>, Zi Shen Lim <zlim.lnx@...il.com>,
	Dave P Martin <Dave.Martin@....com>,
	Yang Shi <yang.shi@...aro.org>,
	Vladimir Murzin <Vladimir.Murzin@....com>,
	Kees Cook <keescook@...omium.org>,
	"Suzuki K. Poulose" <suzuki.poulose@....com>,
	"Mark Brown" <broonie@...nel.org>,
	Alex Bennée <alex.bennee@...aro.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
	Mark Salyzyn <salyzyn@...roid.com>,
	James Morse <james.morse@....com>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Robin Murphy <Robin.Murphy@....com>,
	Jens Wiklander <jens.wiklander@...aro.org>,
	Balamurugan Shanmugam <bshanmugam@....com>,
	sysp-manager <cti.systems-productivity-manager.ts@...achi.com>
Subject: RE: [PATCH v11 3/9] arm64: add copy_to/from_user to kprobes
 blacklist

>From: "David A. Long" <dave.long@...aro.org>
>
>Currrently taking exceptions when accessing user data from a kprobe'd
>instruction doesn't work. Avoid this situation by blacklisting the relevant
>functions.
>
>Signed-off-by: David A. Long <dave.long@...aro.org>

Looks good to me.

Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>

Thanks,

>---
> arch/arm64/lib/copy_from_user.S | 1 +
> arch/arm64/lib/copy_to_user.S   | 1 +
> 2 files changed, 2 insertions(+)
>
>diff --git a/arch/arm64/lib/copy_from_user.S b/arch/arm64/lib/copy_from_user.S
>index 4699cd7..0ac2131 100644
>--- a/arch/arm64/lib/copy_from_user.S
>+++ b/arch/arm64/lib/copy_from_user.S
>@@ -66,6 +66,7 @@
> 	.endm
>
> end	.req	x5
>+	.section .kprobes.text,"ax",%progbits
> ENTRY(__copy_from_user)
> ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(0)), ARM64_HAS_PAN, \
> 	    CONFIG_ARM64_PAN)
>diff --git a/arch/arm64/lib/copy_to_user.S b/arch/arm64/lib/copy_to_user.S
>index 7512bbb..e4eb84c 100644
>--- a/arch/arm64/lib/copy_to_user.S
>+++ b/arch/arm64/lib/copy_to_user.S
>@@ -65,6 +65,7 @@
> 	.endm
>
> end	.req	x5
>+	.section .kprobes.text,"ax",%progbits
> ENTRY(__copy_to_user)
> ALTERNATIVE("nop", __stringify(SET_PSTATE_PAN(0)), ARM64_HAS_PAN, \
> 	    CONFIG_ARM64_PAN)
>--
>2.5.0
>
>
>_______________________________________________
>linux-arm-kernel mailing list
>linux-arm-kernel@...ts.infradead.org
>http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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