Commit 0a188ccb authored Jul 02, 2011 by Jon Medhurst Committed by Tixy Jul 13, 2011

ARM: kprobes: Reject 16-bit Thumb SETEND, CPS and BKPT instructions



These are very rare and/or problematic to emulate so we will take the
easy option and disallow probing them (as does the existing ARM
implementation).

Rejecting these instructions doesn't actually require any entries in the
decoding table as it is the default case for instructions which aren't
found.

Signed-off-by: Jon Medhurst <tixy@yxit.co.uk>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>

parent 396b41f6

arch/arm/kernel/kprobes-thumb.c

+4 −0

Original line number	Original line	Diff line number	Diff line
	@@ -373,6 +373,10 @@ static const union decode_item t16_table_1011[] = {
	/* IT 1011 1111 xxxx xxxx */		/* IT 1011 1111 xxxx xxxx */
	DECODE_CUSTOM (0xff00, 0xbf00, t16_decode_it),		DECODE_CUSTOM (0xff00, 0xbf00, t16_decode_it),

			/* SETEND 1011 0110 010x xxxx */
			/* CPS 1011 0110 011x xxxx */
			/* BKPT 1011 1110 xxxx xxxx */
			/* And unallocated instructions... */
	DECODE_END		DECODE_END
	};		};