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
|
# chroot _____________________________________________________
# long sys_chroot(const char __user * filename)
@define _SYSCALL_CHROOT_NAME
%(
name = "chroot"
%)
@define _SYSCALL_CHROOT_ARGSTR
%(
argstr = path
%)
@define _SYSCALL_CHROOT_REGARGS
%(
path = user_string_quoted(pointer_arg(1))
path_unquoted = user_string_nofault(pointer_arg(1))
%)
@define _SYSCALL_CHROOT_REGARGS_STORE
%(
if (@probewrite(path_unquoted))
set_user_string_arg(pointer_arg(1), path_unquoted)
%)
probe syscall.chroot = dw_syscall.chroot !, nd_syscall.chroot ? {}
probe syscall.chroot.return = dw_syscall.chroot.return !, nd_syscall.chroot.return ? {}
# dw_chroot _____________________________________________________
probe dw_syscall.chroot = kernel.function("sys_chroot").call
{
@_SYSCALL_CHROOT_NAME
path = user_string_quoted($filename)
@_SYSCALL_CHROOT_ARGSTR
}
probe dw_syscall.chroot.return = kernel.function("sys_chroot").return
{
@_SYSCALL_CHROOT_NAME
@SYSC_RETVALSTR($return)
}
# nd_chroot _____________________________________________________
probe nd_syscall.chroot = nd1_syscall.chroot!, nd2_syscall.chroot!, tp_syscall.chroot
{ }
probe nd1_syscall.chroot = kprobe.function("sys_chroot") ?
{
@_SYSCALL_CHROOT_NAME
asmlinkage()
@_SYSCALL_CHROOT_REGARGS
@_SYSCALL_CHROOT_ARGSTR
}
/* kernel 4.17+ */
probe nd2_syscall.chroot = kprobe.function(@arch_syscall_prefix "sys_chroot") ?
{
__set_syscall_pt_regs(pointer_arg(1))
@_SYSCALL_CHROOT_NAME
@_SYSCALL_CHROOT_REGARGS
@_SYSCALL_CHROOT_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_CHROOT_REGARGS_STORE %)
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.chroot = kernel.trace("sys_enter")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_chroot"), @const("__NR_compat_chroot"))
@_SYSCALL_CHROOT_NAME
@_SYSCALL_CHROOT_REGARGS
@_SYSCALL_CHROOT_ARGSTR
},
{
%( @_IS_SREG_KERNEL %? @_SYSCALL_CHROOT_REGARGS_STORE %)
}
probe nd_syscall.chroot.return = nd1_syscall.chroot.return!, nd2_syscall.chroot.return!, tp_syscall.chroot.return
{ }
probe nd1_syscall.chroot.return = kprobe.function("sys_chroot").return ?
{
@_SYSCALL_CHROOT_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 4.17+ */
probe nd2_syscall.chroot.return = kprobe.function(@arch_syscall_prefix "sys_chroot").return ?
{
@_SYSCALL_CHROOT_NAME
@SYSC_RETVALSTR(returnval())
}
/* kernel 3.5+, but undesirable because it affects all syscalls */
probe tp_syscall.chroot.return = kernel.trace("sys_exit")
{
__set_syscall_pt_regs($regs)
@__syscall_compat_gate(@const("__NR_chroot"), @const("__NR_compat_chroot"))
@_SYSCALL_CHROOT_NAME
@SYSC_RETVALSTR($ret)
}
|
