diff options
Diffstat (limited to 'samples/bpf/tracex1_kern.c')
| -rw-r--r-- | samples/bpf/tracex1_kern.c | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/samples/bpf/tracex1_kern.c b/samples/bpf/tracex1_kern.c index 8e2610e14475..ef30d2b353b0 100644 --- a/samples/bpf/tracex1_kern.c +++ b/samples/bpf/tracex1_kern.c @@ -11,7 +11,12 @@ #include <bpf/bpf_helpers.h> #include <bpf/bpf_tracing.h> -#define _(P) ({typeof(P) val = 0; bpf_probe_read(&val, sizeof(val), &P); val;}) +#define _(P) \ + ({ \ + typeof(P) val = 0; \ + bpf_probe_read_kernel(&val, sizeof(val), &(P)); \ + val; \ + }) /* kprobe is NOT a stable ABI * kernel functions can be removed, renamed or completely change semantics. @@ -21,7 +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]; @@ -30,11 +35,11 @@ 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); - bpf_probe_read(devname, sizeof(devname), dev->name); + bpf_probe_read_kernel(devname, sizeof(devname), dev->name); if (devname[0] == 'l' && devname[1] == 'o') { char fmt[] = "skb %p len %d\n"; |