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, 22 insertions, 0 deletions

diff --git a/net/dsa/conduit.h b/net/dsa/conduit.h
new file mode 100644
index 000000000..31f8834f5
--- /dev/null
+++ b/net/dsa/conduit.h
@@ -0,0 +1,22 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#ifndef __DSA_CONDUIT_H
+#define __DSA_CONDUIT_H
+
+struct dsa_port;
+struct net_device;
+struct netdev_lag_upper_info;
+struct netlink_ext_ack;
+
+int dsa_conduit_setup(struct net_device *dev, struct dsa_port *cpu_dp);
+void dsa_conduit_teardown(struct net_device *dev);
+int dsa_conduit_lag_setup(struct net_device *lag_dev, struct dsa_port *cpu_dp,
+			  struct netdev_lag_upper_info *uinfo,
+			  struct netlink_ext_ack *extack);
+void dsa_conduit_lag_teardown(struct net_device *lag_dev,
+			      struct dsa_port *cpu_dp);
+int __dsa_conduit_hwtstamp_validate(struct net_device *dev,
+				    const struct kernel_hwtstamp_config *config,
+				    struct netlink_ext_ack *extack);
+
+#endif