1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (C) 2025 Google LLC. */ 3 #include <linux/bpf.h> 4 #include <time.h> 5 #include <bpf/bpf_helpers.h> 6 7 #include "bpf_misc.h" 8 9 struct { 10 __uint(type, BPF_MAP_TYPE_ARRAY); 11 __type(key, __u32); 12 __type(value, __u32); 13 __uint(max_entries, 1); 14 } excl_map SEC(".maps"); 15 16 char _license[] SEC("license") = "GPL"; 17 18 SEC("?fentry.s/" SYS_PREFIX "sys_getpgid") 19 int should_have_access(void *ctx) 20 { 21 int key = 0, value = 0xdeadbeef; 22 23 bpf_map_update_elem(&excl_map, &key, &value, 0); 24 return 0; 25 } 26 27 SEC("?fentry.s/" SYS_PREFIX "sys_getpgid") 28 int should_not_have_access(void *ctx) 29 { 30 int key = 0, value = 0xdeadbeef; 31 32 bpf_map_update_elem(&excl_map, &key, &value, 0); 33 return 0; 34 } 35