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
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
|
# recv _______________________________________________________
#
# long sys_recv(int fd, void __user *ubuf, size_t size, unsigned flags)
#
# On some kernels, the recv() syscall goes through
# sys_socketcall(), which then calls an inlined version of
# sys_recv(). So, we need to probe sys_socketcall() also.
#
@define _SYSCALL_RECV_NAME
%(
name = "recv"
%)
@define _SYSCALL_RECV_ARGSTR
%(
argstr = sprintf("%d, %p, %u, %s", s, buf_uaddr, len, flags_str)
%)
@define _SYSCALL_RECV_REGARGS
%(
s = int_arg(1)
buf_uaddr = pointer_arg(2)
len = ulong_arg(3)
flags = uint_arg(4)
%)
@define _SYSCALL_SOCKETCALL_RECV_REGARGS
%(
__args = &@ulong_cast(pointer_arg(2))
s = __int32(user_ulong(&@ulong_cast(__args)[0]))
buf_uaddr = user_ulong(&@ulong_cast(__args)[1])
len = user_ulong(&@ulong_cast(__args)[2])
flags = __uint32(user_ulong(&@ulong_cast(__args)[3]))
%)
@define _SYSCALL_COMPAT_SOCKETCALL_RECV_REGARGS
%(
__args = &@uint_cast(pointer_arg(2))
s = user_int(&@uint_cast(__args)[0])
buf_uaddr = user_uint32(&@uint_cast(__args)[1])
len = user_uint32(&@uint_cast(__args)[2])
flags = user_uint32(&@uint_cast(__args)[3])
%)
probe syscall.recv = dw_syscall.recv !, nd_syscall.recv ? {}
probe syscall.recv.return = dw_syscall.recv.return !, nd_syscall.recv.return ? {}
# dw_recv _____________________________________________________
probe dw_syscall.recv = __syscall.socketcall.recv ?,
__syscall.compat_socketcall.recv ?,
__syscall.recv ?
{
@_SYSCALL_RECV_NAME
flags_str = _msg_flags_str(flags)
@_SYSCALL_RECV_ARGSTR
}
probe __syscall.socketcall.recv = kernel.function("sys_socketcall").call ?
{
if (__int32($call) != @const("SYS_RECV")) next;
s = __int32(user_ulong(&@ulong_cast($args)[0]))
buf_uaddr = user_ulong(&@ulong_cast($args)[1])
len = user_ulong(&@ulong_cast($args)[2])
flags = __uint32(user_ulong(&@ulong_cast($args)[3]))
}
probe __syscall.compat_socketcall.recv =
kernel.function("compat_sys_socketcall").call ?
{
if (__int32($call) != @const("SYS_RECV")) next;
s = user_int(&@uint_cast($args)[0])
buf_uaddr = user_uint32(&@uint_cast($args)[1])
len = user_uint32(&@uint_cast($args)[2])
flags = user_uint32(&@uint_cast($args)[3])
}
probe __syscall.recv = kernel.function("sys_recv").call ?
{
@__syscall_gate(@const("__NR_recv"))
s = __int32($fd)
buf_uaddr = $ubuf
len = __ulong($size)
flags = __uint32($flags)
}
probe dw_syscall.recv.return = __syscall.socketcall.recv.return ?,
__syscall.recv.return ?
{
@_SYSCALL_RECV_NAME
@SYSC_RETVALSTR($return)
}
probe __syscall.socketcall.recv.return =
kernel.function("sys_socketcall").return ?,
kernel.function("compat_sys_socketcall").return ?
{
if (__int32(@entry($call)) != @const("SYS_RECV")) next;
}
probe __syscall.recv.return = kernel.function("sys_recv").return ?
{
@__syscall_gate(@const("__NR_recv"))
}
# nd_recv _____________________________________________________
probe nd_syscall.recv = nd1_syscall.recv!, nd2_syscall.recv!, tp_syscall.recv
{ }
probe nd1_syscall.recv = __nd1_syscall.recv ?,
__nd1_syscall.socketcall.recv ?,
__nd1_syscall.compat_socketcall.recv ?
{
@_SYSCALL_RECV_NAME
flags_str = _msg_flags_str(flags)
@_SYSCALL_RECV_ARGSTR
}
probe __nd1_syscall.recv = kprobe.function("sys_recv").call ?
{
asmlinkage()
@__syscall_gate(@const("__NR_recv"))
@_SYSCALL_RECV_REGARGS
}
probe __nd1_syscall.socketcall.recv = kprobe.function("sys_socketcall").call ?
{
asmlinkage()
if (int_arg(1) != @const("SYS_RECV")) next;
@_SYSCALL_SOCKETCALL_RECV_REGARGS
}
probe __nd1_syscall.compat_socketcall.recv =
kprobe.function("compat_sys_socketcall").call ?
{
asmlinkage()
if (int_arg(1) != @const("SYS_RECV")) next;
@_SYSCALL_COMPAT_SOCKETCALL_RECV_REGARGS
}
/* kernel 4.17+ */
probe nd2_syscall.recv = __nd2_syscall.recv ?,
__nd2_syscall.socketcall.recv ?,
__nd2_syscall.compat_socketcall.recv ?
{
@_SYSCALL_RECV_NAME
flags_str = _msg_flags_str(flags)
@_SYSCALL_RECV_ARGSTR
}
probe __nd2_syscall.recv = kprobe.function(@arch_syscall_prefix "sys_recv") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_RECV_REGARGS
}
probe __nd2_syscall.socketcall.recv = kprobe.function(@arch_syscall_prefix "sys_socketcall").call ?
{
__set_syscall_pt_regs(pointer_arg(1))
if (int_arg(1) != @const("SYS_RECV")) next;
@_SYSCALL_SOCKETCALL_RECV_REGARGS
}
probe __nd2_syscall.compat_socketcall.recv =
kprobe.function(@arch_syscall_prefix "compat_sys_socketcall").call ?
{
__set_syscall_pt_regs(pointer_arg(1))
if (int_arg(1) != @const("SYS_RECV")) next;
@_SYSCALL_COMPAT_SOCKETCALL_RECV_REGARGS
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.recv = __tp_syscall.recv ?,
__tp_syscall.socketcall.recv ?
{
@_SYSCALL_RECV_NAME
flags_str = _msg_flags_str(flags)
@_SYSCALL_RECV_ARGSTR
}
probe __tp_syscall.recv = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_gate(@const("__NR_recv"))
@_SYSCALL_RECV_REGARGS
}
probe __tp_syscall.socketcall.recv = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_socketcall"), @const("__NR_compat_socketcall"))
if (int_arg(1) != @const("SYS_RECV")) next;
if (@__compat_task) {
@_SYSCALL_COMPAT_SOCKETCALL_RECV_REGARGS
}
else {
@_SYSCALL_SOCKETCALL_RECV_REGARGS
}
}
probe nd_syscall.recv.return = nd1_syscall.recv.return!, nd2_syscall.recv.return!, tp_syscall.recv.return
{ }
probe nd1_syscall.recv.return = __nd1_syscall.recv.return ?,
__nd1_syscall.socketcall.recv.return ?
{
@_SYSCALL_RECV_NAME
@SYSC_RETVALSTR(returnval())
}
probe __nd1_syscall.recv.return = kprobe.function("sys_recv").return ?
{
@__syscall_gate(@const("__NR_recv"))
}
probe __nd1_syscall.socketcall.recv.return =
kprobe.function("sys_socketcall").return ?,
kprobe.function("compat_sys_socketcall").return ?
{
if (@entry(__asmlinkage_int_arg(1)) != @const("SYS_RECV")) next;
}
/* kernel 4.17+ */
probe nd2_syscall.recv.return =
kprobe.function(@arch_syscall_prefix "sys_recv").return ?,
__nd2_syscall.socketcall.recv.return ?
{
@_SYSCALL_RECV_NAME
@SYSC_RETVALSTR(returnval())
}
probe __nd2_syscall.socketcall.recv.return =
kprobe.function(@arch_syscall_prefix "sys_socketcall").return ?,
kprobe.function(@arch_syscall_prefix "compat_sys_socketcall").return ?
{
__set_syscall_pt_regs(@entry(pointer_arg(1)))
if (int_arg(1) != @const("SYS_RECV")) next;
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.recv.return = __tp_syscall.recv.return ?,
__tp_syscall.socketcall.recv.return ?
{
@_SYSCALL_RECV_NAME
@SYSC_RETVALSTR($ret)
}
probe __tp_syscall.recv.return = kernel.trace("sys_exit")
{
@__syscall_gate(@const("__NR_recv"))
}
probe __tp_syscall.socketcall.recv.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_socketcall"), @const("__NR_compat_socketcall"))
if (int_arg(1) != @const("SYS_RECV")) next;
}
|
