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authorJon Medhurst <tixy@yxit.co.uk>2011-06-11 16:16:41 +0200
committerTixy <tixy@medhuaa1.miniserver.com>2011-07-13 19:32:51 +0200
commit465f1ea595a5040d8b9563e75e0b571a0bacb733 (patch)
tree067ff071634865a82de6d973d24455a5ae2ab59e /arch
parentARM: kprobes: Use new versions of emulate_ldr() and emulate_str() (diff)
downloadlinux-465f1ea595a5040d8b9563e75e0b571a0bacb733.tar.xz
linux-465f1ea595a5040d8b9563e75e0b571a0bacb733.zip
ARM: kprobes: Reject probing of unprivileged load and store instructions
These occur extremely rarely in the kernel and writing test cases for them is difficult. Signed-off-by: Jon Medhurst <tixy@yxit.co.uk> Acked-by: Nicolas Pitre <nicolas.pitre@linaro.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/kernel/kprobes-arm.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/arm/kernel/kprobes-arm.c b/arch/arm/kernel/kprobes-arm.c
index 1ee38adeb82d..70e540b7c53b 100644
--- a/arch/arm/kernel/kprobes-arm.c
+++ b/arch/arm/kernel/kprobes-arm.c
@@ -1262,6 +1262,13 @@ static const union decode_item arm_cccc_0001_____1001_table[] = {
static const union decode_item arm_cccc_000x_____1xx1_table[] = {
/* Extra load/store instructions */
+ /* STRHT cccc 0000 xx10 xxxx xxxx xxxx 1011 xxxx */
+ /* ??? cccc 0000 xx10 xxxx xxxx xxxx 11x1 xxxx */
+ /* LDRHT cccc 0000 xx11 xxxx xxxx xxxx 1011 xxxx */
+ /* LDRSBT cccc 0000 xx11 xxxx xxxx xxxx 1101 xxxx */
+ /* LDRSHT cccc 0000 xx11 xxxx xxxx xxxx 1111 xxxx */
+ DECODE_REJECT (0x0f200090, 0x00200090),
+
/* LDRD/STRD lr,pc,{... cccc 000x x0x0 xxxx 111x xxxx 1101 xxxx */
DECODE_REJECT (0x0e10e0d0, 0x0000e0d0),
@@ -1564,6 +1571,12 @@ static const union decode_item arm_cccc_01xx_table[] = {
/* LDRB/STRB pc,[...] cccc 01xx x0xx xxxx xxxx xxxx xxxx xxxx */
DECODE_REJECT (0x0c40f000, 0x0440f000),
+ /* STRT cccc 01x0 x010 xxxx xxxx xxxx xxxx xxxx */
+ /* LDRT cccc 01x0 x011 xxxx xxxx xxxx xxxx xxxx */
+ /* STRBT cccc 01x0 x110 xxxx xxxx xxxx xxxx xxxx */
+ /* LDRBT cccc 01x0 x111 xxxx xxxx xxxx xxxx xxxx */
+ DECODE_REJECT (0x0d200000, 0x04200000),
+
/* STR (immediate) cccc 010x x0x0 xxxx xxxx xxxx xxxx xxxx */
/* STRB (immediate) cccc 010x x1x0 xxxx xxxx xxxx xxxx xxxx */
DECODE_EMULATEX (0x0e100000, 0x04000000, emulate_str,