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| Started by | David Long <dave.long@linaro.org> |
|---|---|
| First post | 2016-02-19 00:50 +0100 |
| Last post | 2016-02-19 00:50 +0100 |
| Articles | 1 — 1 participant |
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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
| From | David Long <dave.long@linaro.org> |
|---|---|
| Date | 2016-02-19 00:50 +0100 |
| Subject | [PATCH 3/8] arm64: add copy_to/from_user to kprobes blacklist |
| Message-ID | <r3GuB-4Gv-1@gated-at.bofh.it> |
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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