42 lines
884 B
C
42 lines
884 B
C
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2019 Facebook
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#include <linux/ptrace.h>
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__type(key, int);
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__type(value, int);
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__uint(max_entries, 1);
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} my_pid_map SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_PERF_EVENT_ARRAY);
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__type(key, int);
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__type(value, int);
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} perf_buf_map SEC(".maps");
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SEC("tp/raw_syscalls/sys_enter")
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int handle_sys_enter(void *ctx)
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{
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int zero = 0, *my_pid, cur_pid;
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int cpu = bpf_get_smp_processor_id();
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my_pid = bpf_map_lookup_elem(&my_pid_map, &zero);
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if (!my_pid)
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return 1;
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cur_pid = bpf_get_current_pid_tgid() >> 32;
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if (cur_pid != *my_pid)
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return 1;
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bpf_perf_event_output(ctx, &perf_buf_map, BPF_F_CURRENT_CPU,
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&cpu, sizeof(cpu));
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return 1;
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}
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char _license[] SEC("license") = "GPL";
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