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ARM: kprobes: Reject 32-bit Thumb coprocessor and SIMD instructions

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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: Jon Medhurst <tixy@yxit.co.uk>
Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
This commit is contained in:
Jon Medhurst 2011-07-03 14:57:18 +01:00 committed by Tixy
parent ce715c772f
commit 6a0d1a1c56
1 changed files with 16 additions and 0 deletions
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16
arch/arm/kernel/kprobes-thumb.c
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@ -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
};