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| author | Yaqi Chen <chendotjs@gmail.com> | 2021-04-16 23:48:03 +0800 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2021-04-19 18:19:49 -0700 |
| commit | 137733d08f4ab14a354dacaa9a8fc35217747605 (patch) | |
| tree | db597015b653b9a2ba76a5d94e296018255761b8 /samples | |
| parent | 900367b208ee04768bb4323d0051ba11c434bafc (diff) | |
| download | lwn-137733d08f4ab14a354dacaa9a8fc35217747605.tar.gz lwn-137733d08f4ab14a354dacaa9a8fc35217747605.zip | |
samples/bpf: Fix broken tracex1 due to kprobe argument change
>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 <chendotjs@gmail.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210416154803.37157-1-chendotjs@gmail.com
Diffstat (limited to 'samples')
| -rw-r--r-- | samples/bpf/tracex1_kern.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/samples/bpf/tracex1_kern.c b/samples/bpf/tracex1_kern.c index 3f4599c9a202..ef30d2b353b0 100644 --- a/samples/bpf/tracex1_kern.c +++ b/samples/bpf/tracex1_kern.c @@ -26,7 +26,7 @@ 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]; @@ -35,7 +35,7 @@ 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); |