ARM: kprobes: Reject 16-bit Thumb SVC and UNDEFINED instructions
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>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
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 @@
/* 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
};