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
|
# lseek ______________________________________________________
# off_t sys_lseek(unsigned int fd, off_t offset, unsigned int whence)
# COMPAT_SYSCALL_DEFINE3(lseek, unsigned int, fd, compat_off_t, offset,
# unsigned int, whence)
# long sys32_lseek(unsigned int fd, int offset, unsigned int whence)
#
@define _SYSCALL_LSEEK_NAME
%(
name = "lseek"
%)
@define _SYSCALL_LSEEK_ARGSTR
%(
argstr = sprintf("%d, %d, %s", fildes, offset, whence_str)
%)
@define _SYSCALL_LSEEK_REGARGS
%(
fildes = int_arg(1)
offset = @__compat_task ? int_arg(2) : long_arg(2)
whence = uint_arg(3)
whence_str = _seek_whence_str(whence)
%)
@define _SYSCALL_GATE
%(
%( arch == "s390" %?
// On s390x, older kernels used sys32_lseek_wrapper() as the
// lseek compat function. Since sys32_lseek_wrapper() was
// written in assembly language, we can't probe it. So, on
// those kernels, we'll probe sys_lseek().
%( kernel_v >= "3.10" %?
@__syscall_gate_compat_simple
%)
%:
@__syscall_gate_compat_simple
%)
%)
probe syscall.lseek = dw_syscall.lseek !, nd_syscall.lseek ? {}
probe syscall.lseek.return = dw_syscall.lseek.return !, nd_syscall.lseek.return ? {}
# dw_lseek _____________________________________________________
probe dw_syscall.lseek = __syscall.lseek ?,
%( arch == "powerpc" %?
kernel.function("ppc32_lseek").call ?,
%)
kernel.function("compat_sys_lseek").call ?,
kernel.function("sys32_lseek").call ?
{
@_SYSCALL_LSEEK_NAME
fildes = __int32($fd)
offset = @__compat_long($offset)
whence = @__compat_ulong(@choose_defined($whence, $origin))
whence_str = _seek_whence_str(whence)
@_SYSCALL_LSEEK_ARGSTR
}
probe __syscall.lseek = kernel.function("sys_lseek").call ?
{
@_SYSCALL_GATE
}
probe dw_syscall.lseek.return = __syscall.lseek.return ?,
%( arch == "powerpc" %?
kernel.function("ppc32_lseek").return ?,
%)
kernel.function("compat_sys_lseek").return ?,
kernel.function("sys32_lseek").return ?
{
@_SYSCALL_LSEEK_NAME
@SYSC_RETVALSTR($return)
}
probe __syscall.lseek.return = kernel.function("sys_lseek").return ?
{
@_SYSCALL_GATE
}
# nd_lseek _____________________________________________________
probe nd_syscall.lseek = nd1_syscall.lseek!, nd2_syscall.lseek!, tp_syscall.lseek
{ }
probe nd1_syscall.lseek = __nd1_syscall.lseek ?,
%( arch == "powerpc" %?
kprobe.function("ppc32_lseek") ?,
%)
kprobe.function("compat_sys_lseek") ?,
kprobe.function("sys32_lseek") ?
{
@_SYSCALL_LSEEK_NAME
asmlinkage()
@_SYSCALL_LSEEK_REGARGS
@_SYSCALL_LSEEK_ARGSTR
}
probe __nd1_syscall.lseek = kprobe.function("sys_lseek") ?
{
@_SYSCALL_GATE
}
/* kernel 4.17+ */
probe nd2_syscall.lseek = kprobe.function(@arch_syscall_prefix "sys_lseek") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_LSEEK_NAME
@_SYSCALL_LSEEK_REGARGS
@_SYSCALL_LSEEK_ARGSTR
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.lseek = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_lseek"), @const("__NR_compat_lseek"))
@_SYSCALL_LSEEK_NAME
@_SYSCALL_LSEEK_REGARGS
@_SYSCALL_LSEEK_ARGSTR
}
probe nd_syscall.lseek.return = nd1_syscall.lseek.return!, nd2_syscall.lseek.return!, tp_syscall.lseek.return
{ }
probe nd1_syscall.lseek.return = __nd1_syscall.lseek.return ?,
%( arch == "powerpc" %?
kprobe.function("ppc32_lseek").return ?,
%)
kprobe.function("compat_sys_lseek").return ?,
kprobe.function("sys32_lseek").return ?
{
@_SYSCALL_LSEEK_NAME
@SYSC_RETVALSTR(returnval())
}
probe __nd1_syscall.lseek.return = kprobe.function("sys_lseek").return ?
{
@_SYSCALL_GATE
}
/* kernel 4.17+ */
probe nd2_syscall.lseek.return = kprobe.function(@arch_syscall_prefix "sys_lseek").return ?
{
@_SYSCALL_LSEEK_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.lseek.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_lseek"), @const("__NR_compat_lseek"))
@_SYSCALL_LSEEK_NAME
@SYSC_RETVALSTR($ret)
}
|
