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/netlabel/netlabel_user.h | 49 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 net/netlabel/netlabel_user.h (limited to 'net/netlabel/netlabel_user.h') diff --git a/net/netlabel/netlabel_user.h b/net/netlabel/netlabel_user.h new file mode 100644 index 000000000..d4c434956 --- /dev/null +++ b/net/netlabel/netlabel_user.h @@ -0,0 +1,49 @@ +/* SPDX-License-Identifier: GPL-2.0-or-later */ +/* + * NetLabel NETLINK Interface + * + * This file defines the NETLINK interface for the NetLabel system. The + * NetLabel system manages static and dynamic label mappings for network + * protocols such as CIPSO and RIPSO. + * + * Author: Paul Moore + */ + +/* + * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 + */ + +#ifndef _NETLABEL_USER_H +#define _NETLABEL_USER_H + +#include +#include +#include +#include +#include +#include +#include + +/* NetLabel NETLINK helper functions */ + +/** + * netlbl_netlink_auditinfo - Fetch the audit information from a NETLINK msg + * @audit_info: NetLabel audit information + */ +static inline void netlbl_netlink_auditinfo(struct netlbl_audit *audit_info) +{ + security_current_getlsmprop_subj(&audit_info->prop); + audit_info->loginuid = audit_get_loginuid(current); + audit_info->sessionid = audit_get_sessionid(current); +} + +/* NetLabel NETLINK I/O functions */ + +int netlbl_netlink_init(void); + +/* NetLabel Audit Functions */ + +struct audit_buffer *netlbl_audit_start_common(int type, + struct netlbl_audit *audit_info); + +#endif -- cgit v1.3.1