1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2023 Meta Platforms, Inc. and affiliates. */
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_core_read.h>
#include "bpf_misc.h"
char _license[] SEC("license") = "GPL";
static long stack[256];
/*
* KPROBE contexts
*/
__weak int kprobe_typedef_ctx_subprog(bpf_user_pt_regs_t *ctx)
{
return bpf_get_stack(ctx, &stack, sizeof(stack), 0);
}
SEC("?kprobe")
__success
int kprobe_typedef_ctx(void *ctx)
{
return kprobe_typedef_ctx_subprog(ctx);
}
#define pt_regs_struct_t typeof(*(__PT_REGS_CAST((struct pt_regs *)NULL)))
__weak int kprobe_struct_ctx_subprog(pt_regs_struct_t *ctx)
{
return bpf_get_stack((void *)ctx, &stack, sizeof(stack), 0);
}
SEC("?kprobe")
__success
int kprobe_resolved_ctx(void *ctx)
{
return kprobe_struct_ctx_subprog(ctx);
}
/* this is current hack to make this work on old kernels */
struct bpf_user_pt_regs_t {};
__weak int kprobe_workaround_ctx_subprog(struct bpf_user_pt_regs_t *ctx)
{
return bpf_get_stack(ctx, &stack, sizeof(stack), 0);
}
SEC("?kprobe")
__success
int kprobe_workaround_ctx(void *ctx)
{
return kprobe_workaround_ctx_subprog(ctx);
}
/*
* RAW_TRACEPOINT contexts
*/
__weak int raw_tp_ctx_subprog(struct bpf_raw_tracepoint_args *ctx)
{
return bpf_get_stack(ctx, &stack, sizeof(stack), 0);
}
SEC("?raw_tp")
__success
int raw_tp_ctx(void *ctx)
{
return raw_tp_ctx_subprog(ctx);
}
/*
* RAW_TRACEPOINT_WRITABLE contexts
*/
__weak int raw_tp_writable_ctx_subprog(struct bpf_raw_tracepoint_args *ctx)
{
return bpf_get_stack(ctx, &stack, sizeof(stack), 0);
}
SEC("?raw_tp")
__success
int raw_tp_writable_ctx(void *ctx)
{
return raw_tp_writable_ctx_subprog(ctx);
}
/*
* PERF_EVENT contexts
*/
__weak int perf_event_ctx_subprog(struct bpf_perf_event_data *ctx)
{
return bpf_get_stack(ctx, &stack, sizeof(stack), 0);
}
SEC("?perf_event")
__success
int perf_event_ctx(void *ctx)
{
return perf_event_ctx_subprog(ctx);
}
|
