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bpf: Enable more helpers for BPF_PROG_TYPE_CGROUP_{DEVICE,SYSCTL,SOCKOPT}

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Currently the following prog types don't fall back to bpf_base_func_proto()
(instead they have cgroup_base_func_proto which has a limited set of
helpers from bpf_base_func_proto):
* BPF_PROG_TYPE_CGROUP_DEVICE
* BPF_PROG_TYPE_CGROUP_SYSCTL
* BPF_PROG_TYPE_CGROUP_SOCKOPT

I don't see any specific reason why we shouldn't use bpf_base_func_proto(),
every other type of program (except bpf-lirc and, understandably, tracing)
use it, so let's fall back to bpf_base_func_proto for those prog types
as well.

This basically boils down to adding access to the following helpers:
* BPF_FUNC_get_prandom_u32
* BPF_FUNC_get_smp_processor_id
* BPF_FUNC_get_numa_node_id
* BPF_FUNC_tail_call
* BPF_FUNC_ktime_get_ns
* BPF_FUNC_spin_lock (CAP_SYS_ADMIN)
* BPF_FUNC_spin_unlock (CAP_SYS_ADMIN)
* BPF_FUNC_jiffies64 (CAP_SYS_ADMIN)

I've also added bpf_perf_event_output() because it's really handy for
logging and debugging.

Signed-off-by: Stanislav Fomichev <sdf@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200420174610.77494-1-sdf@google.com
This commit is contained in:
Stanislav Fomichev
2020-04-20 10:46:10 -07:00
committed by Alexei Starovoitov
parent 93e5168947
commit 0456ea170c
4 changed files with 29 additions and 18 deletions
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24
tools/testing/selftests/bpf/verifier/event_output.c
View File

@@ -92,3 +92,27 @@
.result = ACCEPT,
.retval = 1,
},
{
"perfevent for cgroup dev",
.insns = { __PERF_EVENT_INSNS__ },
.prog_type = BPF_PROG_TYPE_CGROUP_DEVICE,
.fixup_map_event_output = { 4 },
.result = ACCEPT,
.retval = 1,
},
{
"perfevent for cgroup sysctl",
.insns = { __PERF_EVENT_INSNS__ },
.prog_type = BPF_PROG_TYPE_CGROUP_SYSCTL,
.fixup_map_event_output = { 4 },
.result = ACCEPT,
.retval = 1,
},
{
"perfevent for cgroup sockopt",
.insns = { __PERF_EVENT_INSNS__ },
.prog_type = BPF_PROG_TYPE_CGROUP_SOCKOPT,
.fixup_map_event_output = { 4 },
.result = ACCEPT,
.retval = 1,
},