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/rdma/rdma_counter.h | 71 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) create mode 100644 include/rdma/rdma_counter.h (limited to 'include/rdma/rdma_counter.h') diff --git a/include/rdma/rdma_counter.h b/include/rdma/rdma_counter.h new file mode 100644 index 000000000..4204d08a0 --- /dev/null +++ b/include/rdma/rdma_counter.h @@ -0,0 +1,71 @@ +/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */ +/* + * Copyright (c) 2019 Mellanox Technologies. All rights reserved. + */ + +#ifndef _RDMA_COUNTER_H_ +#define _RDMA_COUNTER_H_ + +#include +#include + +#include +#include + +struct ib_device; +struct ib_qp; + +struct auto_mode_param { + int qp_type; +}; + +struct rdma_counter_mode { + enum rdma_nl_counter_mode mode; + enum rdma_nl_counter_mask mask; + struct auto_mode_param param; + bool bind_opcnt; +}; + +struct rdma_port_counter { + struct rdma_counter_mode mode; + struct rdma_hw_stats *hstats; + unsigned int num_counters; + struct mutex lock; +}; + +struct rdma_counter { + struct rdma_restrack_entry res; + struct ib_device *device; + uint32_t id; + struct kref kref; + struct rdma_counter_mode mode; + struct mutex lock; + struct rdma_hw_stats *stats; + u32 port; +}; + +void rdma_counter_init(struct ib_device *dev); +void rdma_counter_release(struct ib_device *dev); +int rdma_counter_set_auto_mode(struct ib_device *dev, u32 port, + enum rdma_nl_counter_mask mask, + bool bind_opcnt, + struct netlink_ext_ack *extack); +int rdma_counter_bind_qp_auto(struct ib_qp *qp, u32 port); +int rdma_counter_unbind_qp(struct ib_qp *qp, u32 port, bool force); + +int rdma_counter_query_stats(struct rdma_counter *counter); +u64 rdma_counter_get_hwstat_value(struct ib_device *dev, u32 port, u32 index); +int rdma_counter_bind_qpn(struct ib_device *dev, u32 port, + u32 qp_num, u32 counter_id); +int rdma_counter_bind_qpn_alloc(struct ib_device *dev, u32 port, + u32 qp_num, u32 *counter_id); +int rdma_counter_unbind_qpn(struct ib_device *dev, u32 port, + u32 qp_num, u32 counter_id); +int rdma_counter_get_mode(struct ib_device *dev, u32 port, + enum rdma_nl_counter_mode *mode, + enum rdma_nl_counter_mask *mask, + bool *opcnt); + +int rdma_counter_modify(struct ib_device *dev, u32 port, + unsigned int index, bool enable); +#endif /* _RDMA_COUNTER_H_ */ -- cgit v1.3.1