1// SPDX-License-Identifier: GPL-2.0
  2#include <linux/bpf.h>
  3#include <bpf/bpf_helpers.h>
  4#include <bpf/bpf_tracing.h>
  5#include <stdbool.h>
  6
  7char _license[] SEC("license") = "GPL";
  8
  9__u64 uprobe_multi_func_1_addr = 0;
 10__u64 uprobe_multi_func_2_addr = 0;
 11__u64 uprobe_multi_func_3_addr = 0;
 12
 13__u64 uprobe_multi_func_1_result = 0;
 14__u64 uprobe_multi_func_2_result = 0;
 15__u64 uprobe_multi_func_3_result = 0;
 16
 17__u64 uretprobe_multi_func_1_result = 0;
 18__u64 uretprobe_multi_func_2_result = 0;
 19__u64 uretprobe_multi_func_3_result = 0;
 20
 21__u64 uprobe_multi_sleep_result = 0;
 22
 23int pid = 0;
 24int child_pid = 0;
 25
 26bool test_cookie = false;
 27void *user_ptr = 0;
 28
 29static __always_inline bool verify_sleepable_user_copy(void)
 30{
 31	char data[9];
 32
 33	bpf_copy_from_user(data, sizeof(data), user_ptr);
 34	return bpf_strncmp(data, sizeof(data), "test_data") == 0;
 35}
 36
 37static void uprobe_multi_check(void *ctx, bool is_return, bool is_sleep)
 38{
 39	child_pid = bpf_get_current_pid_tgid() >> 32;
 40
 41	if (pid && child_pid != pid)
 42		return;
 43
 44	__u64 cookie = test_cookie ? bpf_get_attach_cookie(ctx) : 0;
 45	__u64 addr = bpf_get_func_ip(ctx);
 46
 47#define SET(__var, __addr, __cookie) ({			\
 48	if (addr == __addr &&				\
 49	   (!test_cookie || (cookie == __cookie)))	\
 50		__var += 1;				\
 51})
 52
 53	if (is_return) {
 54		SET(uretprobe_multi_func_1_result, uprobe_multi_func_1_addr, 2);
 55		SET(uretprobe_multi_func_2_result, uprobe_multi_func_2_addr, 3);
 56		SET(uretprobe_multi_func_3_result, uprobe_multi_func_3_addr, 1);
 57	} else {
 58		SET(uprobe_multi_func_1_result, uprobe_multi_func_1_addr, 3);
 59		SET(uprobe_multi_func_2_result, uprobe_multi_func_2_addr, 1);
 60		SET(uprobe_multi_func_3_result, uprobe_multi_func_3_addr, 2);
 61	}
 62
 63#undef SET
 64
 65	if (is_sleep && verify_sleepable_user_copy())
 66		uprobe_multi_sleep_result += 1;
 67}
 68
 69SEC("uprobe.multi//proc/self/exe:uprobe_multi_func_*")
 70int uprobe(struct pt_regs *ctx)
 71{
 72	uprobe_multi_check(ctx, false, false);
 73	return 0;
 74}
 75
 76SEC("uretprobe.multi//proc/self/exe:uprobe_multi_func_*")
 77int uretprobe(struct pt_regs *ctx)
 78{
 79	uprobe_multi_check(ctx, true, false);
 80	return 0;
 81}
 82
 83SEC("uprobe.multi.s//proc/self/exe:uprobe_multi_func_*")
 84int uprobe_sleep(struct pt_regs *ctx)
 85{
 86	uprobe_multi_check(ctx, false, true);
 87	return 0;
 88}
 89
 90SEC("uretprobe.multi.s//proc/self/exe:uprobe_multi_func_*")
 91int uretprobe_sleep(struct pt_regs *ctx)
 92{
 93	uprobe_multi_check(ctx, true, true);
 94	return 0;
 95}
 96
 97SEC("uprobe.multi//proc/self/exe:uprobe_multi_func_*")
 98int uprobe_extra(struct pt_regs *ctx)
 99{
100	return 0;
101}