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 --- include/media/dvb_net.h | 95 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 95 insertions(+) create mode 100644 include/media/dvb_net.h (limited to 'include/media/dvb_net.h') diff --git a/include/media/dvb_net.h b/include/media/dvb_net.h new file mode 100644 index 000000000..4a921ea96 --- /dev/null +++ b/include/media/dvb_net.h @@ -0,0 +1,95 @@ +/* + * dvb_net.h + * + * Copyright (C) 2001 Ralph Metzler for convergence integrated media GmbH + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public License + * as published by the Free Software Foundation; either version 2.1 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#ifndef _DVB_NET_H_ +#define _DVB_NET_H_ + +#include + +#include + +struct net_device; + +#define DVB_NET_DEVICES_MAX 10 + +#ifdef CONFIG_DVB_NET + +/** + * struct dvb_net - describes a DVB network interface + * + * @dvbdev: pointer to &struct dvb_device. + * @device: array of pointers to &struct net_device. + * @state: array of integers to each net device. A value + * different than zero means that the interface is + * in usage. + * @exit: flag to indicate when the device is being removed. + * @demux: pointer to &struct dmx_demux. + * @ioctl_mutex: protect access to this struct. + * @remove_mutex: mutex that avoids a race condition between a callback + * called when the hardware is disconnected and the + * file_operations of dvb_net. + * + * Currently, the core supports up to %DVB_NET_DEVICES_MAX (10) network + * devices. + */ + +struct dvb_net { + struct dvb_device *dvbdev; + struct net_device *device[DVB_NET_DEVICES_MAX]; + int state[DVB_NET_DEVICES_MAX]; + unsigned int exit:1; + struct dmx_demux *demux; + struct mutex ioctl_mutex; + struct mutex remove_mutex; +}; + +/** + * dvb_net_init - nitializes a digital TV network device and registers it. + * + * @adap: pointer to &struct dvb_adapter. + * @dvbnet: pointer to &struct dvb_net. + * @dmxdemux: pointer to &struct dmx_demux. + */ +int dvb_net_init(struct dvb_adapter *adap, struct dvb_net *dvbnet, + struct dmx_demux *dmxdemux); + +/** + * dvb_net_release - releases a digital TV network device and unregisters it. + * + * @dvbnet: pointer to &struct dvb_net. + */ +void dvb_net_release(struct dvb_net *dvbnet); + +#else + +struct dvb_net { + struct dvb_device *dvbdev; +}; + +static inline void dvb_net_release(struct dvb_net *dvbnet) +{ +} + +static inline int dvb_net_init(struct dvb_adapter *adap, + struct dvb_net *dvbnet, struct dmx_demux *dmx) +{ + return 0; +} + +#endif /* ifdef CONFIG_DVB_NET */ + +#endif -- cgit v1.3.1