[PATCH 3/8] arm64: add copy_to/from_user to kprobes blacklist

From	David Long <dave.long@linaro.org>
Newsgroups	linux.kernel
Subject	[PATCH 3/8] arm64: add copy_to/from_user to kprobes blacklist
Date	2016-02-19 00:50 +0100
Message-ID	<r3GuB-4Gv-1@gated-at.bofh.it> (permalink)
References	<r3GuB-4Gv-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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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

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[PATCH 3/8] arm64: add copy_to/from_user to kprobes blacklist David Long <dave.long@linaro.org> - 2016-02-19 00:50 +0100

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