bpf: add bpf_prog_run_data_pointers() #6335
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syzbot found that cls_bpf_classify() is able to change tc_skb_cb(skb)->drop_reason triggering a warning in sk_skb_reason_drop(). WARNING: CPU: 0 PID: 5965 at net/core/skbuff.c:1192 __sk_skb_reason_drop net/core/skbuff.c:1189 [inline] WARNING: CPU: 0 PID: 5965 at net/core/skbuff.c:1192 sk_skb_reason_drop+0x76/0x170 net/core/skbuff.c:1214 struct tc_skb_cb has been added in commit ec624fe ("net/sched: Extend qdisc control block with tc control block"), which added a wrong interaction with db58ba4 ("bpf: wire in data and data_end for cls_act_bpf"). drop_reason was added later. Add bpf_prog_run_data_pointers() helper to save/restore the net_sched storage colliding with BPF data_meta/data_end. Fixes: ec624fe ("net/sched: Extend qdisc control block with tc control block") Reported-by: syzbot <[email protected]> Closes: https://lore.kernel.org/netdev/[email protected]/ Signed-off-by: Eric Dumazet <[email protected]> Cc: Paul Blakey <[email protected]> Reviewed-by: Victor Nogueira <[email protected]> Acked-by: Jamal Hadi Salim <[email protected]>
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=1022489 irrelevant now. Closing PR. |
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Pull request for series with
subject: bpf: add bpf_prog_run_data_pointers()
version: 1
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=1022489