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
105
106
107
108
109
110
111
112
113
114
115
116
|
# bpf ________________________________________________________
# SYSCALL_DEFINE3(bpf, int, cmd, union bpf_attr __user *, uattr,
# unsigned int, size)
@define _SYSCALL_BPF_NAME
%(
name = "bpf"
%)
@define _SYSCALL_BPF_ARGSTR
%(
argstr = sprintf("%s, %p, %u", cmd_str, attr_uaddr, size)
%)
@define _SYSCALL_BPF_REGARGS
%(
cmd = int_arg(1)
cmd_str = _bpf_cmd_str(cmd)
attr_uaddr = pointer_arg(2)
size = uint_arg(3)
%)
@define _SYSCALL_BPF_REGARGS_STORE
%(
if (@probewrite(cmd))
set_int_arg(1, cmd)
if (@probewrite(attr_uaddr))
set_pointer_arg(2, attr_uaddr)
if (@probewrite(size))
set_uint_arg(3, size)
%)
probe syscall.bpf = dw_syscall.bpf !, nd_syscall.bpf ? {}
probe syscall.bpf.return = dw_syscall.bpf.return !, nd_syscall.bpf.return ? {}
# dw_bpf _____________________________________________________
probe dw_syscall.bpf = kernel.function("sys_bpf") ?
{
@_SYSCALL_BPF_NAME
cmd = __int32($cmd)
cmd_str = _bpf_cmd_str(cmd)
attr_uaddr = $uattr
size = __uint32($size)
@_SYSCALL_BPF_ARGSTR
}
probe dw_syscall.bpf.return = kernel.function("sys_bpf").return ?
{
@_SYSCALL_BPF_NAME
@SYSC_RETVALSTR($return)
}
# nd_bpf _____________________________________________________
probe nd_syscall.bpf = nd1_syscall.bpf!, nd2_syscall.bpf!, tp_syscall.bpf
{ }
probe nd1_syscall.bpf = kprobe.function("sys_bpf") ?
{
@_SYSCALL_BPF_NAME
asmlinkage()
@_SYSCALL_BPF_REGARGS
@_SYSCALL_BPF_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.bpf = kprobe.function(@arch_syscall_prefix "sys_bpf") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_BPF_NAME
@_SYSCALL_BPF_REGARGS
@_SYSCALL_BPF_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_BPF_REGARGS_STORE %)
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.bpf = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_bpf"), @const("__NR_compat_bpf"))
@_SYSCALL_BPF_NAME
@_SYSCALL_BPF_REGARGS
@_SYSCALL_BPF_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_BPF_REGARGS_STORE %)
}
probe nd_syscall.bpf.return = nd1_syscall.bpf.return!, nd2_syscall.bpf.return!, tp_syscall.bpf.return
{ }
probe nd1_syscall.bpf.return = kprobe.function("sys_bpf").return ?
{
@_SYSCALL_BPF_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.bpf.return = kprobe.function(@arch_syscall_prefix "sys_bpf").return ?
{
@_SYSCALL_BPF_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.bpf.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_bpf"), @const("__NR_compat_bpf"))
@_SYSCALL_BPF_NAME
@SYSC_RETVALSTR($ret)
}
|
