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/net/rawv6.h | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 include/net/rawv6.h (limited to 'include/net/rawv6.h') diff --git a/include/net/rawv6.h b/include/net/rawv6.h new file mode 100644 index 000000000..82810cbe3 --- /dev/null +++ b/include/net/rawv6.h @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef _NET_RAWV6_H +#define _NET_RAWV6_H + +#include +#include + +extern struct raw_hashinfo raw_v6_hashinfo; +bool raw_v6_match(struct net *net, const struct sock *sk, unsigned short num, + const struct in6_addr *loc_addr, + const struct in6_addr *rmt_addr, int dif, int sdif); + +int raw_abort(struct sock *sk, int err); + +void raw6_icmp_error(struct sk_buff *, int nexthdr, + u8 type, u8 code, int inner_offset, __be32); +bool raw6_local_deliver(struct sk_buff *, int); + +int rawv6_rcv(struct sock *sk, struct sk_buff *skb); + +#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE) +int rawv6_mh_filter_register(int (*filter)(struct sock *sock, + struct sk_buff *skb)); +int rawv6_mh_filter_unregister(int (*filter)(struct sock *sock, + struct sk_buff *skb)); +#endif + +#endif -- cgit v1.3.1