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, 132 insertions, 0 deletions

diff --git a/net/wireless/nl80211.h b/net/wireless/nl80211.h
new file mode 100644
index 000000000..bdb065d14
--- /dev/null
+++ b/net/wireless/nl80211.h
@@ -0,0 +1,132 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Portions of this file
+ * Copyright (C) 2018, 2020-2026 Intel Corporation
+ */
+#ifndef __NET_WIRELESS_NL80211_H
+#define __NET_WIRELESS_NL80211_H
+
+#include "core.h"
+
+int nl80211_init(void);
+void nl80211_exit(void);
+
+void *nl80211hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
+		     int flags, u8 cmd);
+bool nl80211_put_sta_rate(struct sk_buff *msg, struct rate_info *info,
+			  int attr);
+
+static inline u64 wdev_id(struct wireless_dev *wdev)
+{
+	return (u64)wdev->identifier |
+	       ((u64)wiphy_to_rdev(wdev->wiphy)->wiphy_idx << 32);
+}
+
+int nl80211_parse_chandef(struct cfg80211_registered_device *rdev,
+			  struct netlink_ext_ack *extack,
+			  struct nlattr **attrs,
+			  struct cfg80211_chan_def *chandef,
+			  bool npca_permitted);
+int nl80211_parse_random_mac(struct nlattr **attrs,
+			     u8 *mac_addr, u8 *mac_addr_mask);
+
+void nl80211_notify_wiphy(struct cfg80211_registered_device *rdev,
+			  enum nl80211_commands cmd);
+void nl80211_notify_iface(struct cfg80211_registered_device *rdev,
+			  struct wireless_dev *wdev,
+			  enum nl80211_commands cmd);
+void nl80211_send_scan_start(struct cfg80211_registered_device *rdev,
+			     struct wireless_dev *wdev);
+struct sk_buff *nl80211_build_scan_msg(struct cfg80211_registered_device *rdev,
+				       struct wireless_dev *wdev, bool aborted);
+void nl80211_send_scan_msg(struct cfg80211_registered_device *rdev,
+			   struct sk_buff *msg);
+void nl80211_send_sched_scan(struct cfg80211_sched_scan_request *req, u32 cmd);
+void nl80211_common_reg_change_event(enum nl80211_commands cmd_id,
+				     struct regulatory_request *request);
+
+static inline void
+nl80211_send_reg_change_event(struct regulatory_request *request)
+{
+	nl80211_common_reg_change_event(NL80211_CMD_REG_CHANGE, request);
+}
+
+static inline void
+nl80211_send_wiphy_reg_change_event(struct regulatory_request *request)
+{
+	nl80211_common_reg_change_event(NL80211_CMD_WIPHY_REG_CHANGE, request);
+}
+
+void nl80211_send_rx_auth(struct cfg80211_registered_device *rdev,
+			  struct net_device *netdev,
+			  const u8 *buf, size_t len, gfp_t gfp);
+void nl80211_send_rx_assoc(struct cfg80211_registered_device *rdev,
+			   struct net_device *netdev,
+			   const struct cfg80211_rx_assoc_resp_data *data);
+void nl80211_send_deauth(struct cfg80211_registered_device *rdev,
+			 struct net_device *netdev,
+			 const u8 *buf, size_t len,
+			 bool reconnect, gfp_t gfp);
+void nl80211_send_disassoc(struct cfg80211_registered_device *rdev,
+			   struct net_device *netdev,
+			   const u8 *buf, size_t len,
+			   bool reconnect, gfp_t gfp);
+void nl80211_send_auth_timeout(struct cfg80211_registered_device *rdev,
+			       struct net_device *netdev,
+			       const u8 *addr, gfp_t gfp);
+void nl80211_send_assoc_timeout(struct cfg80211_registered_device *rdev,
+				struct net_device *netdev,
+				const u8 *addr, gfp_t gfp);
+void nl80211_send_connect_result(struct cfg80211_registered_device *rdev,
+				 struct net_device *netdev,
+				 struct cfg80211_connect_resp_params *params,
+				 gfp_t gfp);
+void nl80211_send_roamed(struct cfg80211_registered_device *rdev,
+			 struct net_device *netdev,
+			 struct cfg80211_roam_info *info, gfp_t gfp);
+/* For STA/GC, indicate port authorized with AP/GO bssid.
+ * For GO/AP, use peer GC/STA mac_addr.
+ */
+void nl80211_send_port_authorized(struct cfg80211_registered_device *rdev,
+				  struct net_device *netdev, const u8 *peer_addr,
+				  const u8 *td_bitmap, u8 td_bitmap_len);
+void nl80211_send_disconnected(struct cfg80211_registered_device *rdev,
+			       struct net_device *netdev, u16 reason,
+			       const u8 *ie, size_t ie_len, bool from_ap);
+
+void
+nl80211_michael_mic_failure(struct cfg80211_registered_device *rdev,
+			    struct net_device *netdev, const u8 *addr,
+			    enum nl80211_key_type key_type,
+			    int key_id, const u8 *tsc, gfp_t gfp);
+
+void
+nl80211_send_beacon_hint_event(struct wiphy *wiphy,
+			       struct ieee80211_channel *channel_before,
+			       struct ieee80211_channel *channel_after);
+
+void nl80211_send_ibss_bssid(struct cfg80211_registered_device *rdev,
+			     struct net_device *netdev, const u8 *bssid,
+			     gfp_t gfp);
+
+int nl80211_send_mgmt(struct cfg80211_registered_device *rdev,
+		      struct wireless_dev *wdev, u32 nlpid,
+		      struct cfg80211_rx_info *info, gfp_t gfp);
+
+void
+nl80211_radar_notify(struct cfg80211_registered_device *rdev,
+		     const struct cfg80211_chan_def *chandef,
+		     enum nl80211_radar_event event,
+		     struct net_device *netdev, gfp_t gfp);
+
+void nl80211_send_ap_stopped(struct wireless_dev *wdev, unsigned int link_id);
+
+void cfg80211_free_coalesce(struct cfg80211_coalesce *coalesce);
+
+/* peer measurement */
+int nl80211_pmsr_start(struct sk_buff *skb, struct genl_info *info);
+
+void nl80211_mlo_reconf_add_done(struct net_device *dev,
+				 struct cfg80211_mlo_reconf_done_data *data);
+
+#endif /* __NET_WIRELESS_NL80211_H */