mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-30 13:38:40 +00:00
ec764bf083
Because there is a possibility that skb is kfree_skb()ed and zero cleared after ndo_start_xmit, we should not see the contents of skb like skb->len and skb->dev->name after ndo_start_xmit. But trace_net_dev_xmit does that and causes panic by NULL pointer dereference. This patch fixes trace_net_dev_xmit not to see the contents of skb directly. If you want to reproduce this panic, 1. Get tracepoint of net_dev_xmit on 2. Create 2 guests on KVM 2. Make 2 guests use virtio_net 4. Execute netperf from one to another for a long time as a network burden 5. host will panic(It takes about 30 minutes) Signed-off-by: Koki Sanagi <sanagi.koki@jp.fujitsu.com> Signed-off-by: David S. Miller <davem@davemloft.net>
85 lines
1.6 KiB
C
85 lines
1.6 KiB
C
#undef TRACE_SYSTEM
|
|
#define TRACE_SYSTEM net
|
|
|
|
#if !defined(_TRACE_NET_H) || defined(TRACE_HEADER_MULTI_READ)
|
|
#define _TRACE_NET_H
|
|
|
|
#include <linux/skbuff.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/ip.h>
|
|
#include <linux/tracepoint.h>
|
|
|
|
TRACE_EVENT(net_dev_xmit,
|
|
|
|
TP_PROTO(struct sk_buff *skb,
|
|
int rc,
|
|
struct net_device *dev,
|
|
unsigned int skb_len),
|
|
|
|
TP_ARGS(skb, rc, dev, skb_len),
|
|
|
|
TP_STRUCT__entry(
|
|
__field( void *, skbaddr )
|
|
__field( unsigned int, len )
|
|
__field( int, rc )
|
|
__string( name, dev->name )
|
|
),
|
|
|
|
TP_fast_assign(
|
|
__entry->skbaddr = skb;
|
|
__entry->len = skb_len;
|
|
__entry->rc = rc;
|
|
__assign_str(name, dev->name);
|
|
),
|
|
|
|
TP_printk("dev=%s skbaddr=%p len=%u rc=%d",
|
|
__get_str(name), __entry->skbaddr, __entry->len, __entry->rc)
|
|
);
|
|
|
|
DECLARE_EVENT_CLASS(net_dev_template,
|
|
|
|
TP_PROTO(struct sk_buff *skb),
|
|
|
|
TP_ARGS(skb),
|
|
|
|
TP_STRUCT__entry(
|
|
__field( void *, skbaddr )
|
|
__field( unsigned int, len )
|
|
__string( name, skb->dev->name )
|
|
),
|
|
|
|
TP_fast_assign(
|
|
__entry->skbaddr = skb;
|
|
__entry->len = skb->len;
|
|
__assign_str(name, skb->dev->name);
|
|
),
|
|
|
|
TP_printk("dev=%s skbaddr=%p len=%u",
|
|
__get_str(name), __entry->skbaddr, __entry->len)
|
|
)
|
|
|
|
DEFINE_EVENT(net_dev_template, net_dev_queue,
|
|
|
|
TP_PROTO(struct sk_buff *skb),
|
|
|
|
TP_ARGS(skb)
|
|
);
|
|
|
|
DEFINE_EVENT(net_dev_template, netif_receive_skb,
|
|
|
|
TP_PROTO(struct sk_buff *skb),
|
|
|
|
TP_ARGS(skb)
|
|
);
|
|
|
|
DEFINE_EVENT(net_dev_template, netif_rx,
|
|
|
|
TP_PROTO(struct sk_buff *skb),
|
|
|
|
TP_ARGS(skb)
|
|
);
|
|
#endif /* _TRACE_NET_H */
|
|
|
|
/* This part must be outside protection */
|
|
#include <trace/define_trace.h>
|