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Commit 7ef37712 authored by Teng Qin's avatar Teng Qin Committed by Alexei Starovoitov
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bpf: Allow bpf_current_task_under_cgroup in interrupt 



Currently, the bpf_current_task_under_cgroup helper has a check where if
the BPF program is running in_interrupt(), it will return -EINVAL. This
prevents the helper to be used in many useful scenarios, particularly
BPF programs attached to Perf Events.

This commit removes the check. Tested a few NMI (Perf Event) and some
softirq context, the helper returns the correct result.

Signed-off-by: default avatarTeng Qin <qinteng@fb.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent fcf85729

kernel/trace/bpf_trace.c

+0 −2
Original line number Diff line number Diff line
@@ -475,8 +475,6 @@ BPF_CALL_2(bpf_current_task_under_cgroup, struct bpf_map *, map, u32, idx) 
	struct bpf_array *array = container_of(map, struct bpf_array, map);

	struct cgroup *cgrp;



	if (unlikely(in_interrupt()))

		return -EINVAL;

	if (unlikely(idx >= array->map.max_entries))

		return -E2BIG;