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, 66 insertions, 0 deletions

diff --git a/drivers/macintosh/Makefile b/drivers/macintosh/Makefile
new file mode 100644
index 000000000..712edcb3e
--- /dev/null
+++ b/drivers/macintosh/Makefile
@@ -0,0 +1,66 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the Macintosh-specific device drivers.
+#
+
+# Each configuration option enables a list of files.
+
+obj-$(CONFIG_PPC_PMAC)		+= macio_asic.o macio_sysfs.o
+
+obj-$(CONFIG_PMAC_MEDIABAY)	+= mediabay.o
+obj-$(CONFIG_MAC_EMUMOUSEBTN)	+= mac_hid.o
+obj-$(CONFIG_INPUT_ADBHID)	+= adbhid.o
+obj-$(CONFIG_ANSLCD)		+= ans-lcd.o
+
+obj-$(CONFIG_ADB_PMU)		+= via-pmu.o
+obj-$(CONFIG_ADB_PMU_EVENT)	+= via-pmu-event.o
+obj-$(CONFIG_ADB_PMU_LED)	+= via-pmu-led.o
+obj-$(CONFIG_PMAC_BACKLIGHT)	+= via-pmu-backlight.o
+obj-$(CONFIG_ADB_CUDA)		+= via-cuda.o
+obj-$(CONFIG_PMAC_APM_EMU)	+= apm_emu.o
+obj-$(CONFIG_PMAC_SMU)		+= smu.o
+
+obj-$(CONFIG_ADB)		+= adb.o
+obj-$(CONFIG_ADB_MACII)		+= via-macii.o
+obj-$(CONFIG_ADB_IOP)		+= adb-iop.o
+obj-$(CONFIG_ADB_MACIO)		+= macio-adb.o
+
+obj-$(CONFIG_THERM_WINDTUNNEL)	+= therm_windtunnel.o
+obj-$(CONFIG_THERM_ADT746X)	+= therm_adt746x.o
+obj-$(CONFIG_WINDFARM)	        += windfarm_core.o
+obj-$(CONFIG_WINDFARM_PM72)     += windfarm_fcu_controls.o \
+				   windfarm_ad7417_sensor.o \
+				   windfarm_lm75_sensor.o \
+				   windfarm_max6690_sensor.o \
+				   windfarm_pid.o \
+				   windfarm_cpufreq_clamp.o \
+				   windfarm_pm72.o
+obj-$(CONFIG_WINDFARM_RM31)     += windfarm_fcu_controls.o \
+				   windfarm_ad7417_sensor.o \
+				   windfarm_lm75_sensor.o \
+				   windfarm_lm87_sensor.o \
+				   windfarm_max6690_sensor.o \
+				   windfarm_pid.o \
+				   windfarm_cpufreq_clamp.o \
+				   windfarm_rm31.o
+obj-$(CONFIG_WINDFARM_PM81)     += windfarm_smu_controls.o \
+				   windfarm_smu_sensors.o \
+				   windfarm_lm75_sensor.o windfarm_pid.o \
+				   windfarm_cpufreq_clamp.o windfarm_pm81.o
+obj-$(CONFIG_WINDFARM_PM91)     += windfarm_smu_controls.o \
+				   windfarm_smu_sensors.o \
+				   windfarm_lm75_sensor.o windfarm_pid.o \
+				   windfarm_cpufreq_clamp.o windfarm_pm91.o
+obj-$(CONFIG_WINDFARM_PM112)	+= windfarm_pm112.o windfarm_smu_sat.o \
+				   windfarm_smu_controls.o \
+				   windfarm_smu_sensors.o \
+				   windfarm_max6690_sensor.o \
+				   windfarm_lm75_sensor.o windfarm_pid.o
+obj-$(CONFIG_WINDFARM_PM121)	+= windfarm_pm121.o windfarm_smu_sat.o \
+				   windfarm_smu_controls.o \
+				   windfarm_smu_sensors.o \
+				   windfarm_max6690_sensor.o \
+				   windfarm_lm75_sensor.o windfarm_pid.o
+obj-$(CONFIG_PMAC_RACKMETER)	+= rack-meter.o
+
+obj-$(CONFIG_SENSORS_AMS)	+= ams/