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| author | Yonghong Song <yhs@fb.com> | 2017-12-01 00:47:54 +0300 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2017-12-01 04:56:10 +0300 |
| commit | c8c088ba0edf65044c254b96fc438c91914aaab0 (patch) | |
| tree | 26c2ce03951344a5241e1084cbb68d36275cc61a /kernel/trace/bpf_trace.c | |
| parent | 2b279419567105d63f1e524bb1ac34ae8f918e5d (diff) | |
| download | linux-c8c088ba0edf65044c254b96fc438c91914aaab0.tar.xz | |
bpf: set maximum number of attached progs to 64 for a single perf tp
cgropu+bpf prog array has a maximum number of 64 programs.
Let us apply the same limit here.
Fixes: e87c6bc3852b ("bpf: permit multiple bpf attachments for a single perf event")
Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'kernel/trace/bpf_trace.c')
| -rw-r--r-- | kernel/trace/bpf_trace.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c index 27d1f4ffa3de..0ce99c379c30 100644 --- a/kernel/trace/bpf_trace.c +++ b/kernel/trace/bpf_trace.c @@ -759,6 +759,8 @@ const struct bpf_prog_ops perf_event_prog_ops = { static DEFINE_MUTEX(bpf_event_mutex); +#define BPF_TRACE_MAX_PROGS 64 + int perf_event_attach_bpf_prog(struct perf_event *event, struct bpf_prog *prog) { @@ -772,6 +774,12 @@ int perf_event_attach_bpf_prog(struct perf_event *event, goto unlock; old_array = event->tp_event->prog_array; + if (old_array && + bpf_prog_array_length(old_array) >= BPF_TRACE_MAX_PROGS) { + ret = -E2BIG; + goto unlock; + } + ret = bpf_prog_array_copy(old_array, NULL, prog, &new_array); if (ret < 0) goto unlock; |