From 78004e9a87f240df03e2f73120d291763c32e0a7 Mon Sep 17 00:00:00 2001 From: Ali Ahmet Memis Date: Fri, 21 Aug 2026 01:45:27 +0000 Subject: openrisc: fix arbitrary kernel memory access via or1k_atomic syscall 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 Signed-off-by: Stafford Horne --- net/wireless/wext-compat.h | 58 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 net/wireless/wext-compat.h (limited to 'net/wireless/wext-compat.h') diff --git a/net/wireless/wext-compat.h b/net/wireless/wext-compat.h new file mode 100644 index 000000000..8251ca5df --- /dev/null +++ b/net/wireless/wext-compat.h @@ -0,0 +1,58 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef __WEXT_COMPAT +#define __WEXT_COMPAT + +#include +#include + +int cfg80211_ibss_wext_siwfreq(struct net_device *dev, + struct iw_request_info *info, + struct iw_freq *wextfreq, char *extra); +int cfg80211_ibss_wext_giwfreq(struct net_device *dev, + struct iw_request_info *info, + struct iw_freq *freq, char *extra); +int cfg80211_ibss_wext_siwap(struct net_device *dev, + struct iw_request_info *info, + struct sockaddr *ap_addr, char *extra); +int cfg80211_ibss_wext_giwap(struct net_device *dev, + struct iw_request_info *info, + struct sockaddr *ap_addr, char *extra); +int cfg80211_ibss_wext_siwessid(struct net_device *dev, + struct iw_request_info *info, + struct iw_point *data, char *ssid); +int cfg80211_ibss_wext_giwessid(struct net_device *dev, + struct iw_request_info *info, + struct iw_point *data, char *ssid); + +int cfg80211_mgd_wext_siwfreq(struct net_device *dev, + struct iw_request_info *info, + struct iw_freq *wextfreq, char *extra); +int cfg80211_mgd_wext_giwfreq(struct net_device *dev, + struct iw_request_info *info, + struct iw_freq *freq, char *extra); +int cfg80211_mgd_wext_siwap(struct net_device *dev, + struct iw_request_info *info, + struct sockaddr *ap_addr, char *extra); +int cfg80211_mgd_wext_giwap(struct net_device *dev, + struct iw_request_info *info, + struct sockaddr *ap_addr, char *extra); +int cfg80211_mgd_wext_siwessid(struct net_device *dev, + struct iw_request_info *info, + struct iw_point *data, char *ssid); +int cfg80211_mgd_wext_giwessid(struct net_device *dev, + struct iw_request_info *info, + struct iw_point *data, char *ssid); + +int cfg80211_wext_siwmlme(struct net_device *dev, + struct iw_request_info *info, + union iwreq_data *wrqu, char *extra); +int cfg80211_wext_siwgenie(struct net_device *dev, + struct iw_request_info *info, + union iwreq_data *wrqu, char *extra); + + +int cfg80211_wext_freq(struct iw_freq *freq); + + +extern const struct iw_handler_def cfg80211_wext_handler; +#endif /* __WEXT_COMPAT */ -- cgit v1.3.1