brain-hackers_pepepper-mirror
/
linux-brain
mirror of https://github.com/brain-hackers/linux-brain.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

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>
This commit is contained in:
Yaqi Chen 2021-04-16 23:48:03 +08:00 committed by Greg Kroah-Hartman
parent 9f6e107aab
commit 63a42044b9
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
samples/bpf/tracex1_kern.c
View File

@ -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);