BPF_CALL_2(bpf_xdp_adjust_head, struct xdp_buff *, xdp, int, offset)
{
+ void *xdp_frame_end = xdp->data_hard_start + sizeof(struct xdp_frame);
unsigned long metalen = xdp_get_metalen(xdp);
void *data_start = xdp->data_hard_start + metalen;
void *data = xdp->data + offset;
data > xdp->data_end - ETH_HLEN))
return -EINVAL;
+ /* Avoid info leak, when reusing area prev used by xdp_frame */
+ if (data < xdp_frame_end) {
+ unsigned long clearlen = xdp_frame_end - data;
+
+ memset(data, 0, clearlen);
+ }
+
if (metalen)
memmove(xdp->data_meta + offset,
xdp->data_meta, metalen);