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
|
/*
* Copyright (c) 2015 Dmitry V. Levin <ldv@strace.io>
* Copyright (c) 2015-2021 The strace developers.
* All rights reserved.
*
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#include "defs.h"
#include <linux/fcntl.h>
#include "xlat/name_to_handle_at_flags.h"
#ifndef MAX_HANDLE_SZ
# define MAX_HANDLE_SZ 128
#endif
typedef struct {
unsigned int handle_bytes;
int handle_type;
} file_handle_header;
static void
print_f_handle(struct tcb *tcp, kernel_ulong_t addr, unsigned int handle_bytes)
{
unsigned int len = MIN(handle_bytes, MAX_HANDLE_SZ);
char f_handle[MAX_HANDLE_SZ];
addr += sizeof(file_handle_header);
if (addr > sizeof(file_handle_header) &&
!umoven(tcp, addr, len, f_handle)) {
print_quoted_string(f_handle, len, QUOTE_FORCE_HEX);
if (handle_bytes > len)
tprint_more_data_follows();
} else {
tprint_unavailable();
}
}
SYS_FUNC(name_to_handle_at)
{
file_handle_header h;
const kernel_ulong_t addr = tcp->u_arg[2];
if (entering(tcp)) {
/* dirfd */
print_dirfd(tcp, tcp->u_arg[0]);
tprint_arg_next();
/* pathname */
printpath(tcp, tcp->u_arg[1]);
tprint_arg_next();
/* handle */
if (umove_or_printaddr(tcp, addr, &h)) {
tprint_arg_next();
/* mount_id */
printaddr(tcp->u_arg[3]);
tprint_arg_next();
/* flags */
printflags(name_to_handle_at_flags, tcp->u_arg[4],
"AT_???");
return RVAL_DECODED;
}
tprint_struct_begin();
PRINT_FIELD_U(h, handle_bytes);
set_tcb_priv_ulong(tcp, h.handle_bytes);
return 0;
} else {
if ((!syserror(tcp) || EOVERFLOW == tcp->u_error)
&& !umove(tcp, addr, &h)) {
if (h.handle_bytes != get_tcb_priv_ulong(tcp)) {
tprint_value_changed();
PRINT_VAL_U(h.handle_bytes);
}
if (!syserror(tcp)) {
tprint_struct_next();
PRINT_FIELD_D(h, handle_type);
tprint_struct_next();
tprints_field_name("f_handle");
print_f_handle(tcp, addr, h.handle_bytes);
}
}
tprint_struct_end();
tprint_arg_next();
/* mount_id */
printnum_int(tcp, tcp->u_arg[3], "%d");
tprint_arg_next();
/* flags */
printflags(name_to_handle_at_flags, tcp->u_arg[4], "AT_???");
}
return 0;
}
SYS_FUNC(open_by_handle_at)
{
file_handle_header h;
const kernel_ulong_t addr = tcp->u_arg[1];
/* mount_fd */
printfd(tcp, tcp->u_arg[0]);
tprint_arg_next();
/* handle */
if (!umove_or_printaddr(tcp, addr, &h)) {
tprint_struct_begin();
PRINT_FIELD_U(h, handle_bytes);
tprint_struct_next();
PRINT_FIELD_D(h, handle_type);
tprint_struct_next();
tprints_field_name("f_handle");
print_f_handle(tcp, addr, h.handle_bytes);
tprint_struct_end();
}
tprint_arg_next();
/* flags */
tprint_open_modes(tcp->u_arg[2]);
return RVAL_DECODED;
}
|
