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[31/51] ARM: kprobes: Reject 16-bit Thumb SVC and UNDEFINED instructions

Message ID 1310209058-20980-32-git-send-email-tixy@yxit.co.uk (mailing list archive)
State New, archived
Headers show

Commit Message

Tixy July 9, 2011, 10:57 a.m. UTC 
From: Jon Medhurst <tixy@yxit.co.uk>

SVC (SWI) instructions shouldn't occur in kernel code so we don't
need to be able to probe them.

Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
---
 arch/arm/kernel/kprobes-thumb.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)
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Patch

diff --git a/arch/arm/kernel/kprobes-thumb.c b/arch/arm/kernel/kprobes-thumb.c
index e496948..997fc6d 100644
--- a/arch/arm/kernel/kprobes-thumb.c
+++ b/arch/arm/kernel/kprobes-thumb.c
@@ -464,6 +464,14 @@  const union decode_item kprobe_decode_thumb16_table[] = {
 	/* LDM				1100 1xxx xxxx xxxx */
 	DECODE_EMULATE	(0xf000, 0xc000, t16_emulate_loregs_rwflags),
 
+	/*
+	 * Conditional branch, and Supervisor Call
+	 */
+
+	/* Permanently UNDEFINED	1101 1110 xxxx xxxx */
+	/* SVC				1101 1111 xxxx xxxx */
+	DECODE_REJECT	(0xfe00, 0xde00),
+
 	DECODE_END
 };