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samples/bpf: Fix broken tracex1 due to kprobe argument change

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[ Upstream commit 137733d08f4ab14a354dacaa9a8fc35217747605 ]

>From commit c0bbbdc32feb ("__netif_receive_skb_core: pass skb by
reference"), the first argument passed into __netif_receive_skb_core
has changed to reference of a skb pointer.

This commit fixes by using bpf_probe_read_kernel.

Signed-off-by: Yaqi Chen <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Acked-by: Yonghong Song <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]
Signed-off-by: Sasha Levin <[email protected]>
This commit is contained in:
Yaqi Chen 2021-04-16 23:48:03 +08:00 • committed by Greg Kroah-Hartman
commit 63a42044b9
1 changed files with 2 additions and 2 deletions
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4
samples/bpf/tracex1_kern.c
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@ -20,7 +20,7 @@
SEC("kprobe/__netif_receive_skb_core")
int bpf_prog1(struct pt_regs *ctx)
{
/* attaches to kprobe netif_receive_skb,
/* attaches to kprobe __netif_receive_skb_core,
* looks for packets on loobpack device and prints them
*/
char devname[IFNAMSIZ];
@ -29,7 +29,7 @@ int bpf_prog1(struct pt_regs *ctx)
int len;
/* non-portable! works for the given kernel only */
skb = (struct sk_buff *) PT_REGS_PARM1(ctx);
bpf_probe_read_kernel(&skb, sizeof(skb), (void *)PT_REGS_PARM1(ctx));
dev = _(skb->dev);
len = _(skb->len);