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/sunrpc/netns.h | 44 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 44 insertions(+) create mode 100644 net/sunrpc/netns.h (limited to 'net/sunrpc/netns.h') diff --git a/net/sunrpc/netns.h b/net/sunrpc/netns.h new file mode 100644 index 000000000..4efb5f28d --- /dev/null +++ b/net/sunrpc/netns.h @@ -0,0 +1,44 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __SUNRPC_NETNS_H__ +#define __SUNRPC_NETNS_H__ + +#include +#include + +struct cache_detail; + +struct sunrpc_net { + struct proc_dir_entry *proc_net_rpc; + struct cache_detail *ip_map_cache; + struct cache_detail *unix_gid_cache; + struct cache_detail *rsc_cache; + struct cache_detail *rsi_cache; + + struct super_block *pipefs_sb; + struct rpc_pipe *gssd_dummy; + struct mutex pipefs_sb_lock; + + struct list_head all_clients; + spinlock_t rpc_client_lock; + + struct rpc_clnt *rpcb_local_clnt; + struct rpc_clnt *rpcb_local_clnt4; + spinlock_t rpcb_clnt_lock; + unsigned int rpcb_users; + unsigned int rpcb_is_af_local : 1; + + struct mutex gssp_lock; + struct rpc_clnt *gssp_clnt; + int use_gss_proxy; + int pipe_version; + atomic_t pipe_users; + struct proc_dir_entry *use_gssp_proc; + struct proc_dir_entry *gss_krb5_enctypes; +}; + +extern unsigned int sunrpc_net_id; + +int ip_map_cache_create(struct net *); +void ip_map_cache_destroy(struct net *); + +#endif -- cgit v1.3.1