tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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#include "bpf_kfuncs.h"
7#include "bpf_misc.h"
8
9char _license[] SEC("license") = "GPL";
10
11__u64 uprobe_multi_func_1_addr = 0;
12__u64 uprobe_multi_func_2_addr = 0;
13__u64 uprobe_multi_func_3_addr = 0;
14
15__u64 uprobe_session_result[3] = {};
16__u64 uprobe_multi_sleep_result = 0;
17
18void *user_ptr = 0;
19int pid = 0;
20
21static int uprobe_multi_check(void *ctx, bool is_return)
22{
23 const __u64 funcs[] = {
24 uprobe_multi_func_1_addr,
25 uprobe_multi_func_2_addr,
26 uprobe_multi_func_3_addr,
27 };
28 unsigned int i;
29 __u64 addr;
30
31 if (bpf_get_current_pid_tgid() >> 32 != pid)
32 return 1;
33
34 addr = bpf_get_func_ip(ctx);
35
36 for (i = 0; i < ARRAY_SIZE(funcs); i++) {
37 if (funcs[i] == addr) {
38 uprobe_session_result[i]++;
39 break;
40 }
41 }
42
43 /* only uprobe_multi_func_2 executes return probe */
44 if ((addr == uprobe_multi_func_1_addr) ||
45 (addr == uprobe_multi_func_3_addr))
46 return 1;
47
48 return 0;
49}
50
51SEC("uprobe.session//proc/self/exe:uprobe_multi_func_*")
52int uprobe(struct pt_regs *ctx)
53{
54 return uprobe_multi_check(ctx, bpf_session_is_return());
55}
56
57static __always_inline bool verify_sleepable_user_copy(void)
58{
59 char data[9];
60
61 bpf_copy_from_user(data, sizeof(data), user_ptr);
62 return bpf_strncmp(data, sizeof(data), "test_data") == 0;
63}
64
65SEC("uprobe.session.s//proc/self/exe:uprobe_multi_func_*")
66int uprobe_sleepable(struct pt_regs *ctx)
67{
68 if (verify_sleepable_user_copy())
69 uprobe_multi_sleep_result++;
70 return uprobe_multi_check(ctx, bpf_session_is_return());
71}