syzkaller was able to generate the following XDP program ...
(18) r0 = 0x0
(61) r5 = *(u32 *)(r1 +12)
(04) (u32) r0 += (u32) 0
... and trigger a NULL pointer dereference in ___bpf_prog_run()
via bpf_prog_test_run_xdp() where this was attempted to run.
Reason is that recent xdp_rxq_info addition to XDP programs
updated all drivers, but not bpf_prog_test_run_xdp(), where
xdp_buff is set up. Thus when context rewriter does the deref
on the netdev it's NULL at runtime. Fix it by using xdp_rxq
from loopback dev. __netif_get_rx_queue() helper can also be
reused in various other locations later on.
Fixes: 02dd3291 ("bpf: finally expose xdp_rxq_info to XDP bpf-programs")
Signed-off-by: Daniel Borkmann <firstname.lastname@example.org>
Cc: Jesper Dangaard Brouer <email@example.com>
Acked-by: Jesper Dangaard Brouer <firstname.lastname@example.org>
Signed-off-by: Alexei Starovoitov <email@example.com>