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