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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: Teng Qin <qinteng@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Teng Qin 2018-04-28 23:39:29 -07:00 committed by Alexei Starovoitov
parent fcf85729d8
commit 7ef3771205
1 changed files with 0 additions and 2 deletions
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2
kernel/trace/bpf_trace.c
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@ -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;