cregit-Linux how code gets into the kernel

Release 4.16 samples/bpf/syscall_tp_kern.c

Directory: samples/bpf
/* Copyright (c) 2017 Facebook
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of version 2 of the GNU General Public
 * License as published by the Free Software Foundation.
 */
#include <uapi/linux/bpf.h>
#include "bpf_helpers.h"


struct syscalls_enter_open_args {
	
unsigned long long unused;
	
long syscall_nr;
	
long filename_ptr;
	
long flags;
	
long mode;
};


struct syscalls_exit_open_args {
	
unsigned long long unused;
	
long syscall_nr;
	
long ret;
};

struct bpf_map_def SEC("maps") enter_open_map = {
	.type = BPF_MAP_TYPE_ARRAY,
	.key_size = sizeof(u32),
	.value_size = sizeof(u32),
	.max_entries = 1,
};

struct bpf_map_def SEC("maps") exit_open_map = {
	.type = BPF_MAP_TYPE_ARRAY,
	.key_size = sizeof(u32),
	.value_size = sizeof(u32),
	.max_entries = 1,
};


static __always_inline void count(void *map) { u32 key = 0; u32 *value, init_val = 1; value = bpf_map_lookup_elem(map, &key); if (value) *value += 1; else bpf_map_update_elem(map, &key, &init_val, BPF_NOEXIST); }

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SEC("tracepoint/syscalls/sys_enter_open")
int trace_enter_open(struct syscalls_enter_open_args *ctx) { count((void *)&enter_open_map); return 0; }

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SEC("tracepoint/syscalls/sys_exit_open")
int trace_enter_exit(struct syscalls_exit_open_args *ctx) { count((void *)&exit_open_map); return 0; }

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Directory: samples/bpf
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