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
|
# symlink ____________________________________________________
# long sys_symlink(const char __user * oldname,
# const char __user * newname)
@define _SYSCALL_SYMLINK_NAME
%(
name = "symlink"
%)
@define _SYSCALL_SYMLINK_ARGSTR
%(
argstr = sprintf("%s, %s", oldpath, newpath)
%)
@define _SYSCALL_SYMLINK_REGARGS
%(
oldpath = user_string_quoted(pointer_arg(1))
oldpath_unquoted = user_string_nofault(pointer_arg(1))
newpath = user_string_quoted(pointer_arg(2))
oldpath_unquoted = user_string_nofault(pointer_arg(2))
%)
@define _SYSCALL_SYMLINK_REGARGS_STORE
%(
if (@probewrite(oldpath_unquoted))
set_user_string_arg(pointer_arg(1), oldpath_unquoted)
if (@probewrite(newpath_unquoted))
set_user_string_arg(pointer_arg(2), newpath_unquoted)
%)
probe syscall.symlink = dw_syscall.symlink !, nd_syscall.symlink ? {}
probe syscall.symlink.return = dw_syscall.symlink.return !,
nd_syscall.symlink.return ? {}
# dw_symlink _____________________________________________________
probe dw_syscall.symlink = kernel.function("sys_symlink").call
{
@_SYSCALL_SYMLINK_NAME
oldpath = user_string_quoted($oldname)
newpath = user_string_quoted($newname)
@_SYSCALL_SYMLINK_ARGSTR
}
probe dw_syscall.symlink.return = kernel.function("sys_symlink").return
{
@_SYSCALL_SYMLINK_NAME
@SYSC_RETVALSTR($return)
}
# nd_symlink _____________________________________________________
probe nd_syscall.symlink = nd1_syscall.symlink!, nd2_syscall.symlink!, tp_syscall.symlink
{ }
probe nd1_syscall.symlink = kprobe.function("sys_symlink") ?
{
@_SYSCALL_SYMLINK_NAME
asmlinkage()
@_SYSCALL_SYMLINK_REGARGS
@_SYSCALL_SYMLINK_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.symlink = kprobe.function(@arch_syscall_prefix "sys_symlink") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_SYMLINK_NAME
@_SYSCALL_SYMLINK_REGARGS
@_SYSCALL_SYMLINK_ARGSTR
},
{
@_SYSCALL_SYMLINK_REGARGS_STORE
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.symlink = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_symlink"), @const("__NR_compat_symlink"))
@_SYSCALL_SYMLINK_NAME
@_SYSCALL_SYMLINK_REGARGS
@_SYSCALL_SYMLINK_ARGSTR
},
{
@_SYSCALL_SYMLINK_REGARGS_STORE
}
probe nd_syscall.symlink.return = nd1_syscall.symlink.return!, nd2_syscall.symlink.return!, tp_syscall.symlink.return
{ }
probe nd1_syscall.symlink.return = kprobe.function("sys_symlink").return ?
{
@_SYSCALL_SYMLINK_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.symlink.return = kprobe.function(@arch_syscall_prefix "sys_symlink").return ?
{
@_SYSCALL_SYMLINK_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.symlink.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_symlink"), @const("__NR_compat_symlink"))
@_SYSCALL_SYMLINK_NAME
@SYSC_RETVALSTR($ret)
}
|
