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author | Yaqi Chen <chendotjs@gmail.com> | 2021-04-16 18:48:03 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-22 11:57:37 +0300 |
commit | 3d81ed79e8fb0fe3955b1117a644d6b78e900932 (patch) | |
tree | e225e4617b6066d64e308ff0f94ca22933aa7e78 /samples | |
parent | 7791fefad524d432239d312652b0fd8ec7500cf6 (diff) | |
download | linux-3d81ed79e8fb0fe3955b1117a644d6b78e900932.tar.xz |
samples/bpf: Fix broken tracex1 due to kprobe argument change
[ 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 <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
Signed-off-by: Sasha Levin <sashal@kernel.org>
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 107da148820f..9c74b45c5720 100644 --- a/samples/bpf/tracex1_kern.c +++ b/samples/bpf/tracex1_kern.c @@ -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); |