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
|
// SPDX-License-Identifier: GPL-2.0
#include <linux/compat.h>
#include <linux/uaccess.h>
#include <linux/ptrace.h>
/*
* The compat_siginfo_t structure and handing code is very easy
* to break in several ways. It must always be updated when new
* updates are made to the main siginfo_t, and
* copy_siginfo_to_user32() must be updated when the
* (arch-independent) copy_siginfo_to_user() is updated.
*
* It is also easy to put a new member in the compat_siginfo_t
* which has implicit alignment which can move internal structure
* alignment around breaking the ABI. This can happen if you,
* for instance, put a plain 64-bit value in there.
*/
static inline void signal_compat_build_tests(void)
{
int _sifields_offset = offsetof(compat_siginfo_t, _sifields);
/*
* If adding a new si_code, there is probably new data in
* the siginfo. Make sure folks bumping the si_code
* limits also have to look at this code. Make sure any
* new fields are handled in copy_siginfo_to_user32()!
*/
BUILD_BUG_ON(NSIGILL != 11);
BUILD_BUG_ON(NSIGFPE != 15);
BUILD_BUG_ON(NSIGSEGV != 9);
BUILD_BUG_ON(NSIGBUS != 5);
BUILD_BUG_ON(NSIGTRAP != 6);
BUILD_BUG_ON(NSIGCHLD != 6);
BUILD_BUG_ON(NSIGSYS != 2);
/* This is part of the ABI and can never change in size: */
BUILD_BUG_ON(sizeof(siginfo_t) != 128);
BUILD_BUG_ON(sizeof(compat_siginfo_t) != 128);
/* This is a part of the ABI and can never change in alignment */
BUILD_BUG_ON(__alignof__(siginfo_t) != 8);
BUILD_BUG_ON(__alignof__(compat_siginfo_t) != 4);
/*
* The offsets of all the (unioned) si_fields are fixed
* in the ABI, of course. Make sure none of them ever
* move and are always at the beginning:
*/
BUILD_BUG_ON(offsetof(compat_siginfo_t, _sifields) != 3 * sizeof(int));
#define CHECK_CSI_OFFSET(name) BUILD_BUG_ON(_sifields_offset != offsetof(compat_siginfo_t, _sifields.name))
BUILD_BUG_ON(offsetof(siginfo_t, si_signo) != 0);
BUILD_BUG_ON(offsetof(siginfo_t, si_errno) != 4);
BUILD_BUG_ON(offsetof(siginfo_t, si_code) != 8);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_signo) != 0);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_errno) != 4);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_code) != 8);
/*
* Ensure that the size of each si_field never changes.
* If it does, it is a sign that the
* copy_siginfo_to_user32() code below needs to updated
* along with the size in the CHECK_SI_SIZE().
*
* We repeat this check for both the generic and compat
* siginfos.
*
* Note: it is OK for these to grow as long as the whole
* structure stays within the padding size (checked
* above).
*/
#define CHECK_CSI_SIZE(name, size) BUILD_BUG_ON(size != sizeof(((compat_siginfo_t *)0)->_sifields.name))
#define CHECK_SI_SIZE(name, size) BUILD_BUG_ON(size != sizeof(((siginfo_t *)0)->_sifields.name))
CHECK_CSI_OFFSET(_kill);
CHECK_CSI_SIZE (_kill, 2*sizeof(int));
CHECK_SI_SIZE (_kill, 2*sizeof(int));
BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x10);
BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x14);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_pid) != 0xC);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_uid) != 0x10);
CHECK_CSI_OFFSET(_timer);
CHECK_CSI_SIZE (_timer, 3*sizeof(int));
CHECK_SI_SIZE (_timer, 6*sizeof(int));
BUILD_BUG_ON(offsetof(siginfo_t, si_tid) != 0x10);
BUILD_BUG_ON(offsetof(siginfo_t, si_overrun) != 0x14);
BUILD_BUG_ON(offsetof(siginfo_t, si_value) != 0x18);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_tid) != 0x0C);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_overrun) != 0x10);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_value) != 0x14);
CHECK_CSI_OFFSET(_rt);
CHECK_CSI_SIZE (_rt, 3*sizeof(int));
CHECK_SI_SIZE (_rt, 4*sizeof(int));
BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x10);
BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x14);
BUILD_BUG_ON(offsetof(siginfo_t, si_value) != 0x18);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_pid) != 0x0C);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_uid) != 0x10);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_value) != 0x14);
CHECK_CSI_OFFSET(_sigchld);
CHECK_CSI_SIZE (_sigchld, 5*sizeof(int));
CHECK_SI_SIZE (_sigchld, 8*sizeof(int));
BUILD_BUG_ON(offsetof(siginfo_t, si_pid) != 0x10);
BUILD_BUG_ON(offsetof(siginfo_t, si_uid) != 0x14);
BUILD_BUG_ON(offsetof(siginfo_t, si_status) != 0x18);
BUILD_BUG_ON(offsetof(siginfo_t, si_utime) != 0x20);
BUILD_BUG_ON(offsetof(siginfo_t, si_stime) != 0x28);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_pid) != 0x0C);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_uid) != 0x10);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_status) != 0x14);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_utime) != 0x18);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_stime) != 0x1C);
#ifdef CONFIG_X86_X32_ABI
CHECK_CSI_OFFSET(_sigchld_x32);
CHECK_CSI_SIZE (_sigchld_x32, 7*sizeof(int));
/* no _sigchld_x32 in the generic siginfo_t */
BUILD_BUG_ON(offsetof(compat_siginfo_t, _sifields._sigchld_x32._utime) != 0x18);
BUILD_BUG_ON(offsetof(compat_siginfo_t, _sifields._sigchld_x32._stime) != 0x20);
#endif
CHECK_CSI_OFFSET(_sigfault);
CHECK_CSI_SIZE (_sigfault, 4*sizeof(int));
CHECK_SI_SIZE (_sigfault, 8*sizeof(int));
BUILD_BUG_ON(offsetof(siginfo_t, si_addr) != 0x10);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_addr) != 0x0C);
BUILD_BUG_ON(offsetof(siginfo_t, si_trapno) != 0x18);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_trapno) != 0x10);
BUILD_BUG_ON(offsetof(siginfo_t, si_addr_lsb) != 0x18);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_addr_lsb) != 0x10);
BUILD_BUG_ON(offsetof(siginfo_t, si_lower) != 0x20);
BUILD_BUG_ON(offsetof(siginfo_t, si_upper) != 0x28);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_lower) != 0x14);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_upper) != 0x18);
BUILD_BUG_ON(offsetof(siginfo_t, si_pkey) != 0x20);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_pkey) != 0x14);
BUILD_BUG_ON(offsetof(siginfo_t, si_perf_data) != 0x18);
BUILD_BUG_ON(offsetof(siginfo_t, si_perf_type) != 0x20);
BUILD_BUG_ON(offsetof(siginfo_t, si_perf_flags) != 0x24);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_perf_data) != 0x10);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_perf_type) != 0x14);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_perf_flags) != 0x18);
CHECK_CSI_OFFSET(_sigpoll);
CHECK_CSI_SIZE (_sigpoll, 2*sizeof(int));
CHECK_SI_SIZE (_sigpoll, 4*sizeof(int));
BUILD_BUG_ON(offsetof(siginfo_t, si_band) != 0x10);
BUILD_BUG_ON(offsetof(siginfo_t, si_fd) != 0x18);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_band) != 0x0C);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_fd) != 0x10);
CHECK_CSI_OFFSET(_sigsys);
CHECK_CSI_SIZE (_sigsys, 3*sizeof(int));
CHECK_SI_SIZE (_sigsys, 4*sizeof(int));
BUILD_BUG_ON(offsetof(siginfo_t, si_call_addr) != 0x10);
BUILD_BUG_ON(offsetof(siginfo_t, si_syscall) != 0x18);
BUILD_BUG_ON(offsetof(siginfo_t, si_arch) != 0x1C);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_call_addr) != 0x0C);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_syscall) != 0x10);
BUILD_BUG_ON(offsetof(compat_siginfo_t, si_arch) != 0x14);
/* any new si_fields should be added here */
}
void sigaction_compat_abi(struct k_sigaction *act, struct k_sigaction *oact)
{
signal_compat_build_tests();
if (!act)
return;
if (in_ia32_syscall())
act->sa.sa_flags |= SA_IA32_ABI;
if (in_x32_syscall())
act->sa.sa_flags |= SA_X32_ABI;
}
|
