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Commit 6a0d1a1c authored by Jon Medhurst's avatar Jon Medhurst Committed by Tixy
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ARM: kprobes: Reject 32-bit Thumb coprocessor and SIMD instructions 



The kernel doesn't currently support VFP or Neon code, and probing of
code with CP15 operations is fraught with bad consequences. So we will
just reject probing these instructions.

Signed-off-by: default avatarJon Medhurst <tixy@yxit.co.uk>
Acked-by: default avatarNicolas Pitre <nicolas.pitre@linaro.org>
parent ce715c77

arch/arm/kernel/kprobes-thumb.c

+16 −0
Original line number Diff line number Diff line
@@ -509,6 +509,12 @@ const union decode_item kprobe_decode_thumb32_table[] = { 
	 */

	DECODE_TABLE	(0xfe000000, 0xea000000, t32_table_1110_101x),



	/*

	 * Coprocessor instructions

	 *			1110 11xx xxxx xxxx xxxx xxxx xxxx xxxx

	 */

	DECODE_REJECT	(0xfc000000, 0xec000000),



	/*

	 * Data-processing (modified immediate)

	 *			1111 0x0x xxxx xxxx 0xxx xxxx xxxx xxxx
@@ -527,6 +533,16 @@ const union decode_item kprobe_decode_thumb32_table[] = { 
	 */

	DECODE_TABLE	(0xf8008000, 0xf0008000, t32_table_1111_0xxx___1),



	/*

	 * Advanced SIMD element or structure load/store instructions

	 *			1111 1001 xxx0 xxxx xxxx xxxx xxxx xxxx

	 */

	DECODE_REJECT	(0xff100000, 0xf9000000),



	/*

	 * Coprocessor instructions

	 *			1111 11xx xxxx xxxx xxxx xxxx xxxx xxxx

	 */

	DECODE_END

};