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, 27 insertions, 0 deletions

diff --git a/net/bluetooth/Makefile b/net/bluetooth/Makefile
new file mode 100644
index 000000000..41049b280
--- /dev/null
+++ b/net/bluetooth/Makefile
@@ -0,0 +1,27 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the Linux Bluetooth subsystem.
+#
+
+obj-$(CONFIG_BT)	+= bluetooth.o
+obj-$(CONFIG_BT_RFCOMM)	+= rfcomm/
+obj-$(CONFIG_BT_BNEP)	+= bnep/
+obj-$(CONFIG_BT_HIDP)	+= hidp/
+obj-$(CONFIG_BT_6LOWPAN) += bluetooth_6lowpan.o
+
+bluetooth_6lowpan-y := 6lowpan.o
+
+bluetooth-y := af_bluetooth.o hci_core.o hci_conn.o hci_event.o mgmt.o \
+	hci_sock.o hci_sysfs.o l2cap_core.o l2cap_sock.o smp.o lib.o \
+	ecdh_helper.o mgmt_util.o mgmt_config.o hci_codec.o eir.o hci_sync.o \
+	hci_drv.o
+
+bluetooth-$(CONFIG_DEV_COREDUMP) += coredump.o
+
+bluetooth-$(CONFIG_BT_BREDR) += sco.o
+bluetooth-$(CONFIG_BT_LE) += iso.o
+bluetooth-$(CONFIG_BT_LEDS) += leds.o
+bluetooth-$(CONFIG_BT_MSFTEXT) += msft.o
+bluetooth-$(CONFIG_BT_AOSPEXT) += aosp.o
+bluetooth-$(CONFIG_BT_DEBUGFS) += hci_debugfs.o
+bluetooth-$(CONFIG_BT_SELFTEST) += selftest.o