openrisc: fix arbitrary kernel memory access via or1k_atomic syscallgrafted

sys_or1k_atomic() (syscall 244 in the "or1k" ABI) takes two user
pointers, v1 and v2, and swaps the words they point to in hand-written
assembly.

    l.lwz   r29,0(r4)
    l.lwz   r27,0(r5)
    l.sw    0(r4),r27
    l.sw    0(r5),r29

The pointers are not checked with access_ok(). The four memory
accesses also have no exception table entries.

A caller passes a kernel address as either pointer, and the syscall
reads from and writes to it directly.

This gives an unprivileged process a kernel read/write primitive. It
overwrites kernel data such as the sys_call_table, gaining code
execution in kernel context.

Check both pointers before entering the critical section. Add fixups
for the four memory accesses so faults on valid but unmapped user
addresses return -EFAULT.

[shorne@gmail.com: fix comment style]
Fixes: 9d02a4283e9c ("OpenRISC: Boot code")
Cc: stable@vger.kernel.org
Signed-off-by: Ali Ahmet Memis <ali@iusegentoo.com>
Signed-off-by: Stafford Horne <shorne@gmail.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/drivers/input/mouse/Makefile b/drivers/input/mouse/Makefile
new file mode 100644
index 000000000..ed40f1416
--- /dev/null
+++ b/drivers/input/mouse/Makefile
@@ -0,0 +1,41 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the mouse drivers.
+#
+
+# Each configuration option enables a list of files.
+
+obj-$(CONFIG_MOUSE_AMIGA)		+= amimouse.o
+obj-$(CONFIG_MOUSE_APPLETOUCH)		+= appletouch.o
+obj-$(CONFIG_MOUSE_ATARI)		+= atarimouse.o
+obj-$(CONFIG_MOUSE_BCM5974)		+= bcm5974.o
+obj-$(CONFIG_MOUSE_CYAPA)		+= cyapatp.o
+obj-$(CONFIG_MOUSE_ELAN_I2C)		+= elan_i2c.o
+obj-$(CONFIG_MOUSE_GPIO)		+= gpio_mouse.o
+obj-$(CONFIG_MOUSE_MAPLE)		+= maplemouse.o
+obj-$(CONFIG_MOUSE_PS2)			+= psmouse.o
+obj-$(CONFIG_MOUSE_RISCPC)		+= rpcmouse.o
+obj-$(CONFIG_MOUSE_SERIAL)		+= sermouse.o
+obj-$(CONFIG_MOUSE_SYNAPTICS_I2C)	+= synaptics_i2c.o
+obj-$(CONFIG_MOUSE_SYNAPTICS_USB)	+= synaptics_usb.o
+obj-$(CONFIG_MOUSE_VSXXXAA)		+= vsxxxaa.o
+
+cyapatp-objs := cyapa.o cyapa_gen3.o cyapa_gen5.o cyapa_gen6.o
+psmouse-objs := psmouse-base.o synaptics.o focaltech.o
+
+psmouse-$(CONFIG_MOUSE_PS2_ALPS)	+= alps.o
+psmouse-$(CONFIG_MOUSE_PS2_BYD)		+= byd.o
+psmouse-$(CONFIG_MOUSE_PS2_ELANTECH)	+= elantech.o
+psmouse-$(CONFIG_MOUSE_PS2_LOGIPS2PP)	+= logips2pp.o
+psmouse-$(CONFIG_MOUSE_PS2_LIFEBOOK)	+= lifebook.o
+psmouse-$(CONFIG_MOUSE_PS2_SENTELIC)	+= sentelic.o
+psmouse-$(CONFIG_MOUSE_PS2_TRACKPOINT)	+= trackpoint.o
+psmouse-$(CONFIG_MOUSE_PS2_TOUCHKIT)	+= touchkit_ps2.o
+psmouse-$(CONFIG_MOUSE_PS2_CYPRESS)	+= cypress_ps2.o
+psmouse-$(CONFIG_MOUSE_PS2_VMMOUSE)	+= vmmouse.o
+
+psmouse-$(CONFIG_MOUSE_PS2_SMBUS)	+= psmouse-smbus.o
+
+elan_i2c-objs := elan_i2c_core.o
+elan_i2c-$(CONFIG_MOUSE_ELAN_I2C_I2C)	+= elan_i2c_i2c.o
+elan_i2c-$(CONFIG_MOUSE_ELAN_I2C_SMBUS)	+= elan_i2c_smbus.o