// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2020 Facebook
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#include <linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_core_read.h>
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struct task_struct {
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int tgid;
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} __attribute__((preserve_access_index));
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__uint(max_entries, 1);
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__type(key, int);
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__type(value, int);
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} exp_tgid_map SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__uint(max_entries, 1);
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__type(key, int);
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__type(value, int);
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} results 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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struct task_struct *task = (void *)bpf_get_current_task();
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int tgid = BPF_CORE_READ(task, tgid);
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int zero = 0;
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int real_tgid = bpf_get_current_pid_tgid() >> 32;
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int *exp_tgid = bpf_map_lookup_elem(&exp_tgid_map, &zero);
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/* only pass through sys_enters from test process */
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if (!exp_tgid || *exp_tgid != real_tgid)
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return 0;
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bpf_map_update_elem(&results, &zero, &tgid, 0);
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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