openrisc: fix arbitrary kernel memory access via or1k_atomic syscallgrafted

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 <ali@iusegentoo.com>
Signed-off-by: Stafford Horne <shorne@gmail.com>

1 files changed, 141 insertions, 0 deletions

diff --git a/drivers/net/thunderbolt/trace.h b/drivers/net/thunderbolt/trace.h
new file mode 100644
index 000000000..9626eadae
--- /dev/null
+++ b/drivers/net/thunderbolt/trace.h
@@ -0,0 +1,141 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Tracepoints for Thunderbolt/USB4 networking driver
+ *
+ * Copyright (C) 2023, Intel Corporation
+ * Author: Mika Westerberg <mika.westerberg@linux.intel.com>
+ */
+
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM thunderbolt_net
+
+#if !defined(__TRACE_THUNDERBOLT_NET_H) || defined(TRACE_HEADER_MULTI_READ)
+#define __TRACE_THUNDERBOLT_NET_H
+
+#include <linux/dma-direction.h>
+#include <linux/skbuff.h>
+#include <linux/tracepoint.h>
+
+#define DMA_DATA_DIRECTION_NAMES			\
+	{ DMA_BIDIRECTIONAL, "DMA_BIDIRECTIONAL" },	\
+	{ DMA_TO_DEVICE, "DMA_TO_DEVICE" },		\
+	{ DMA_FROM_DEVICE, "DMA_FROM_DEVICE" },		\
+	{ DMA_NONE, "DMA_NONE" }
+
+DECLARE_EVENT_CLASS(tbnet_frame,
+	TP_PROTO(unsigned int index, const void *page, dma_addr_t phys,
+		 enum dma_data_direction dir),
+	TP_ARGS(index, page, phys, dir),
+	TP_STRUCT__entry(
+		__field(unsigned int, index)
+		__field(const void *, page)
+		__field(dma_addr_t, phys)
+		__field(enum dma_data_direction, dir)
+	),
+	TP_fast_assign(
+		__entry->index = index;
+		__entry->page = page;
+		__entry->phys = phys;
+		__entry->dir = dir;
+	),
+	TP_printk("index=%u page=%p phys=%pad dir=%s",
+		  __entry->index, __entry->page, &__entry->phys,
+		__print_symbolic(__entry->dir, DMA_DATA_DIRECTION_NAMES))
+);
+
+DEFINE_EVENT(tbnet_frame, tbnet_alloc_rx_frame,
+	TP_PROTO(unsigned int index, const void *page, dma_addr_t phys,
+		 enum dma_data_direction dir),
+	TP_ARGS(index, page, phys, dir)
+);
+
+DEFINE_EVENT(tbnet_frame, tbnet_alloc_tx_frame,
+	TP_PROTO(unsigned int index, const void *page, dma_addr_t phys,
+		 enum dma_data_direction dir),
+	TP_ARGS(index, page, phys, dir)
+);
+
+DEFINE_EVENT(tbnet_frame, tbnet_free_frame,
+	TP_PROTO(unsigned int index, const void *page, dma_addr_t phys,
+		 enum dma_data_direction dir),
+	TP_ARGS(index, page, phys, dir)
+);
+
+DECLARE_EVENT_CLASS(tbnet_ip_frame,
+	TP_PROTO(__le32 size, __le16 id, __le16 index, __le32 count),
+	TP_ARGS(size, id, index, count),
+	TP_STRUCT__entry(
+		__field(u32, size)
+		__field(u16, id)
+		__field(u16, index)
+		__field(u32, count)
+	),
+	TP_fast_assign(
+		__entry->size = le32_to_cpu(size);
+		__entry->id = le16_to_cpu(id);
+		__entry->index = le16_to_cpu(index);
+		__entry->count = le32_to_cpu(count);
+	),
+	TP_printk("id=%u size=%u index=%u count=%u",
+		  __entry->id, __entry->size, __entry->index, __entry->count)
+);
+
+DEFINE_EVENT(tbnet_ip_frame, tbnet_rx_ip_frame,
+	TP_PROTO(__le32 size, __le16 id, __le16 index, __le32 count),
+	TP_ARGS(size, id, index, count)
+);
+
+DEFINE_EVENT(tbnet_ip_frame, tbnet_invalid_rx_ip_frame,
+	TP_PROTO(__le32 size, __le16 id, __le16 index, __le32 count),
+	TP_ARGS(size, id, index, count)
+);
+
+DEFINE_EVENT(tbnet_ip_frame, tbnet_tx_ip_frame,
+	TP_PROTO(__le32 size, __le16 id, __le16 index, __le32 count),
+	TP_ARGS(size, id, index, count)
+);
+
+DECLARE_EVENT_CLASS(tbnet_skb,
+	TP_PROTO(const struct sk_buff *skb),
+	TP_ARGS(skb),
+	TP_STRUCT__entry(
+		__field(const void *, addr)
+		__field(unsigned int, len)
+		__field(unsigned int, data_len)
+		__field(unsigned int, nr_frags)
+	),
+	TP_fast_assign(
+		__entry->addr = skb;
+		__entry->len = skb->len;
+		__entry->data_len = skb->data_len;
+		__entry->nr_frags = skb_shinfo(skb)->nr_frags;
+	),
+	TP_printk("skb=%p len=%u data_len=%u nr_frags=%u",
+		  __entry->addr, __entry->len, __entry->data_len,
+		  __entry->nr_frags)
+);
+
+DEFINE_EVENT(tbnet_skb, tbnet_rx_skb,
+	TP_PROTO(const struct sk_buff *skb),
+	TP_ARGS(skb)
+);
+
+DEFINE_EVENT(tbnet_skb, tbnet_tx_skb,
+	TP_PROTO(const struct sk_buff *skb),
+	TP_ARGS(skb)
+);
+
+DEFINE_EVENT(tbnet_skb, tbnet_consume_skb,
+	TP_PROTO(const struct sk_buff *skb),
+	TP_ARGS(skb)
+);
+
+#endif /* _TRACE_THUNDERBOLT_NET_H */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+
+#undef TRACE_INCLUDE_FILE
+#define TRACE_INCLUDE_FILE trace
+
+#include <trace/define_trace.h>