cls_bpf: do eBPF invocation under non-bh RCU lock variant for maps
Currently, it is possible in cls_bpf to access eBPF maps only under
rcu_read_lock_bh() variants: while on ingress side, that is, handle_ing(),
the classifier would be called from __netif_receive_skb_core() under
rcu_read_lock(); on egress side, however, it's rcu_read_lock_bh() via
__dev_queue_xmit().
This rcu/rcu_bh mix doesn't work together with eBPF maps as they require
soley to be called under rcu_read_lock(). eBPF maps could also be shared
among various other eBPF programs (possibly even with other eBPF program
types, f.e. tracing) and user space processes, so any context is assumed.
Therefore, a possible fix for cls_bpf is to wrap/nest eBPF program
invocation under non-bh RCU lock variant.
Fixes: e2e9b6541dd4 ("cls_bpf: add initial eBPF support for programmable classifiers")
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@plumgrid.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sched/cls_bpf.c b/net/sched/cls_bpf.c
index 243c9f2..5c4171c 100644
--- a/net/sched/cls_bpf.c
+++ b/net/sched/cls_bpf.c
@@ -64,8 +64,10 @@
{
struct cls_bpf_head *head = rcu_dereference_bh(tp->root);
struct cls_bpf_prog *prog;
- int ret;
+ int ret = -1;
+ /* Needed here for accessing maps. */
+ rcu_read_lock();
list_for_each_entry_rcu(prog, &head->plist, link) {
int filter_res = BPF_PROG_RUN(prog->filter, skb);
@@ -80,10 +82,11 @@
if (ret < 0)
continue;
- return ret;
+ break;
}
+ rcu_read_unlock();
- return -1;
+ return ret;
}
static bool cls_bpf_is_ebpf(const struct cls_bpf_prog *prog)