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From: David Long <dave.long@linaro.org>
To: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	Sandeepa Prabhu <sandeepa.s.prabhu@gmail.com>,
	William Cohen <wcohen@redhat.com>,
	Pratyush Anand <panand@redhat.com>,
	Steve Capper <steve.capper@linaro.org>,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Cc: "Dave P Martin" <Dave.Martin@arm.com>,
	"Mark Rutland" <mark.rutland@arm.com>,
	"Marc Zyngier" <marc.zyngier@arm.com>,
	"Robin Murphy" <Robin.Murphy@arm.com>,
	"Ard Biesheuvel" <ard.biesheuvel@linaro.org>,
	"Jens Wiklander" <jens.wiklander@linaro.org>,
	"Christoffer Dall" <christoffer.dall@linaro.org>,
	"Alex Bennée" <alex.bennee@linaro.org>,
	"Yang Shi" <yang.shi@linaro.org>,
	"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
	"Viresh Kumar" <viresh.kumar@linaro.org>,
	"Suzuki K. Poulose" <suzuki.poulose@arm.com>,
	"Kees Cook" <keescook@chromium.org>,
	"Zi Shen Lim" <zlim.lnx@gmail.com>,
	"John Blackwood" <john.blackwood@ccur.com>,
	"Feng Kan" <fkan@apm.com>,
	"Balamurugan Shanmugam" <bshanmugam@apm.com>,
	"James Morse" <james.morse@arm.com>,
	"Vladimir Murzin" <Vladimir.Murzin@arm.com>,
	"Mark Salyzyn" <salyzyn@android.com>,
	"Petr Mladek" <pmladek@suse.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Mark Brown" <broonie@kernel.org>
Subject: [PATCH 3/8] arm64: add copy_to/from_user to kprobes blacklist
Date: Thu, 18 Feb 2016 18:48:16 -0500	[thread overview]
Message-ID: <1455839301-26464-4-git-send-email-dave.long@linaro.org> (raw)
In-Reply-To: <1455839301-26464-1-git-send-email-dave.long@linaro.org>

From: "David A. Long" <dave.long@linaro.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@linaro.org>
---
 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

  parent reply	other threads:[~2016-02-18 23:48 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-02-18 23:48 [PATCH 0/8] arm64: Add kernel probes (kprobes) support David Long
2016-02-18 23:48 ` [PATCH 1/8] arm64: Add HAVE_REGS_AND_STACK_ACCESS_API feature David Long
2016-02-18 23:48 ` [PATCH 2/8] arm64: Add more test functions to insn.c David Long
2016-02-18 23:48 ` David Long [this message]
2016-02-18 23:48 ` [PATCH 4/8] arm64: Kprobes with single stepping support David Long
2016-02-18 23:48 ` [PATCH 5/8] arm64: kprobes instruction simulation support David Long
2016-02-19 14:04   ` Marc Zyngier
2016-02-24  6:56     ` David Long
2016-02-24  9:05       ` Marc Zyngier
2016-02-24 15:07         ` David Long
2016-02-24 15:21           ` Marc Zyngier
2016-03-01  2:55             ` David Long
2016-02-18 23:48 ` [PATCH 6/8] arm64: Add trampoline code for kretprobes David Long
2016-02-18 23:48 ` [PATCH 7/8] arm64: Add kernel return probes support (kretprobes) David Long
2016-02-18 23:48 ` [PATCH 8/8] kprobes: Add arm64 case in kprobe example module David Long

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